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1
Ling, Zhen, Ju Rui Yang e Zhe Nai Lu. "Research on the Effect of Sewage Concentration on Treatment Efficiency of Constructed Wetlands". Advanced Materials Research 356-360 (ottobre 2011): 1510–15. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1510.
Testo completoAbstract (sommario):
By changing the surface flow(SF) and subsurface flow (SSF)constructed wetlands inflow water total nitrogen (TN) concentrations, with 6 plant species (purple leaf canna, water onion, water hyacinth, water celery, calamus, reed) in comparative experiments, comparative analysis of the 6 different SF and SSF constructed wetlands treatment rate with the variation of the concentration obtained in the 6 different plant SF and SSF constructed wetlands, the optimal concentration theory, theory of optimal removal rate, the actual optimal concentration, the actual optimal removal rate and TN maximum daily processing load. The results showed that: in the 6 different plant of SF and SSF constructed wetlands for TN removal efficiency decreased as the concentration increased, different plant, different levels of treatment rate reduction, and removal value of SSF was lower than SF. Purple leaf canna removal reduced the minimum, SF processing rate decreased 17.07%, SSF dropped 15.94%; Reed removal rate decreased obviously, the SF processing rate decreased 20.86%, SSF dropped 18.2%. Meanwhile, according to the result of the experiment, the maximum TN daily remove quantity in the six species of plants of SF constructed wetland was 547.20 g•m-2•d-1;in SSF constructed wetland was 577.60 g•m-2•d-1. Wetland as an efficient, low consumption of new sewage treatment technology has been widely accepted, especially in total nitrogen (TN) in the application phase for the people attention. Study found that of nitrogen removal efficiency of constructed wetlands and external factors, a wetland substrate, plant species, microbes, sewage load, residence time, nitrogen in sewage and water distribution methods[1]. For the wastewater load on the removal of wetlands, Zhou Yaohua so that low concentration of domestic sewage (20% water) on the ground flora as a whole more effective than a higher concentration of the decontamination wastewater (100% effluent) better overall removal [2]. Cui Fang water residence time in the study of the impact of decontamination capability of wetlands that the reed wetland water CODcr, TP, NH3-N concentration had little effect on the removal, and TN concentrations had a significant effect on the removal, removal of only 27% [3], Yuan Donghai and others that wetlands on the initial concentration of pollutants in wastewater have certain requirements, low pollution case, the constructed wetland was better; higher concentration of pollutants cases, the purification efficiency dropped [4]. Effluent decontamination effect on the wetland will have some impact, at present, domestic and international research to a single species of plants, mainly a single type of wetland, considering the different plants, different types of comparative study of wetlands was less. By changing SF and SSF constructed wetlands, inflow water TN concentrations, with 6 plant speciesin comparative experiments, comparative analysis of the 6 different plants of SF and SSF constructed wetlands treatment rate with the variation of the concentration obtained in 6 different plant SF and SSF constructed wetlands, the optimal concentration theory, theory of optimal removal rate, the actual optimal concentration, optimal removal rate and the actual TN maximum daily processing load, optimizing the hydraulic conditions of wetlands. Research on the promotion of artificial wetland technology, further development of eco-environmental rehabilitation has a certain significance
2
Zhang, Jie, Shuqing An e Xin Leng. "Status of wetland research in China". Marine and Freshwater Research 71, n. 12 (2020): 1572. http://dx.doi.org/10.1071/mf20103.
Testo completoAbstract (sommario):
This study used a bibliometric approach to quantitatively evaluate the status of wetland research in China using detailed information from 31794 articles retrieved from the Science Citation Index Expanded (SCIE) database and published from 1999 to 2019. We outline the progress of wetland research in China in terms of the number of articles published, active research institutions, funding provided, research directions, dynamic changes in the focus of the research and development trends. By analysing high-frequency keywords, we conclude that there are four focus areas of wetlands research in China: (1) climate change; (2) wetland pollution; (3) wetland plants and microorganisms; and (4) the conservation and management of wetlands. By combining focus area and high-citation analysis, we show that carbon storage and organic carbon mineralisation, biological remediation, constructed wetlands for the treatment of waste water and the sustainable use of ecological services are currently the most notable research areas, with a marked increase since 2009. These topics are in line with the focus of research globally over the past 6 years and are likely to become a primary research focus in future. The results of this study provide a useful theoretical basis and directions for further research in the sustainable development of wetland resources in China.
3
Kennedy, Gavin, e Tatiana Mayer. "Natural and Constructed Wetlands in Canada: An Overview". Water Quality Research Journal 37, n. 2 (1 maggio 2002): 295–325. http://dx.doi.org/10.2166/wqrj.2002.020.
Testo completoAbstract (sommario):
Abstract A review of freshwater wetland research in Canada was conducted to highlight the importance of these ecosystems and to identify wetland research needs. Both natural and constructed wetland systems are discussed. Natural wetlands are an important part of the Canadian landscape. They provide the habitat for a broad variety of flora and fauna and contribute significantly to the Canadian economy. It is estimated that the total value derived from consumptive and non-consumptive activities exceeds $10 billion annually. The past decades have witnessed the continued loss and degradation of wetlands in Canada. In spite of recent protection, Canadian wetlands remain threatened by anthropogenic activities. This review shows that more research on fate and transport of pollutants from urban and agricultural sources in wetland systems is needed to better protect the health and to assure the sustainability of wetlands in Canada. Furthermore, improved knowledge of hydrology and hydrogeochemistry of wetlands will assure more effective management of these ecosystems. Lastly, better understanding of the effect of climate change on wetlands will result in better protection of these important ecosystems. Constructed wetlands are man-made wetlands used to treat non-point source pollution. The wetland treatment technology capitalizes on the intrinsic water quality amelioration function of wetlands and is emerging as a cost-effective, environmentally friendly method of treating a variety of wastewaters. The use of wetland technology in Canada is, however, less common than in the U.S.A. A number of research needs has to be addressed before the wetland treatment technology can gain widespread acceptance in Canada. This includes research pertaining to cold weather performance, including more monitoring, research on design adaptation and investigation of the effects of constructed wetlands on wildlife.
4
Wang, Han Xi, Jian Ling Xu, Lian Xi Sheng e Xue Jun Liu. "A Review of Research on Substrate Materials for Constructed Wetlands". Materials Science Forum 913 (febbraio 2018): 917–29. http://dx.doi.org/10.4028/www.scientific.net/msf.913.917.
Testo completoAbstract (sommario):
Based on the improvements in the decontamination ability and decontamination range of constructed wetlands, this study of constructed wetland substrates was carried out using literature research and comparative meta-analysis. The results show that, for static adsorption, the absorption levels of nitrogen and phosphorus in a given constructed wetland are different. As for hydraulic load, the average removal rate of total nitrogen in wastewater is less than 50%. Compared with single substrates, a combination of substrates is typically superior in terms of the removal rate of sewage pollutants. Adsorption is the key in removing pollutants in constructed wetlands, and modification of the wetland materials is an effective way to improve the decontamination ability of the substrate material. At present, there are areas of potential improvement in the research on the development of new wetland materials for the study of pollutant characteristics, as well as a dearth of modification methods for single and reclaimable wetland substrates in constructed wetlands. These issues should be taken into account in the future studies on constructed wetland materials.
5
Qin, Lu Mei, Hong Hu Zeng e Yan Peng Liang. "Research Development on Constructed Wetlands". Applied Mechanics and Materials 535 (febbraio 2014): 388–93. http://dx.doi.org/10.4028/www.scientific.net/amm.535.388.
Testo completoAbstract (sommario):
Constructed wetland is a mode of economical and highly effective system applied in wastewater treatment with special removal mechanism function, which has drawn much attention over the world constantly. On the basis of study from abroad, this article makes the brief induction of removal mechanism, influential factors and combined technique of constructed wetlands, for the further research works were also put forward in the next future.
6
Langergraber, G. "Simulation of subsurface flow constructed wetlands - results and further research needs". Water Science and Technology 48, n. 5 (1 settembre 2003): 157–66. http://dx.doi.org/10.2166/wst.2003.0308.
Testo completoAbstract (sommario):
Simulation of constructed wetlands has two main tasks: to obtain a better understanding of the processes in constructed wetlands, and to check and optimise existing design criteria. This paper shows simulation results for two indoor pilot-scale constructed wetlands for wastewater and surface water treatment respectively. The results presented and discussed are mainly focussed on the hydraulic behaviour of the constructed wetland systems. In addition results of reactive transport simulations with CW2D are shown. The multi-component reactive transport model CW2D (Constructed Wetlands 2 Dimensional) was developed to model transport and reactions of the main constituents of wastewater (organic matter, nitrogen, and phosphorus) in subsurface flow constructed wetlands. For the pilot-scale constructed wetlands a calibration of the flow model was possible and therefore the results of the reactive transport simulations with CW2D fit the measured data well. The further research needs regarding the simulation of subsurface flow constructed wetlands are discussed.
7
COLES, J. M., e B. COLES. "Wetlands research". Nature 323, n. 6090 (ottobre 1986): 664. http://dx.doi.org/10.1038/323664c0.
Testo completo
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Qin, Yu Qian. "The Problems of Wetlands in our Country and the Researches". Advanced Materials Research 610-613 (dicembre 2012): 3242–46. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.3242.
Testo completoAbstract (sommario):
The characteristics and current situation of China’s wetlands are discussed, the reasons that cause environmental degradation of China’s wetlands are analyzed in this article. The emphases of research on domestic west lands are summarized from three aspects that function and benefit development of wetlands, construction of wetland reserves, restoration and reconstruction of wetlands, in addition, the development trend of future research on wetlands is prospected.
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Carberry, Brendan, Tom A. Langen e Michael R. Twiss. "Surface Water Quality Differs between Functionally Similar Restored and Natural Wetlands of the Saint Lawrence River Valley in New York". Land 10, n. 7 (27 giugno 2021): 676. http://dx.doi.org/10.3390/land10070676.
Testo completoAbstract (sommario):
We tested the hypothesis that upland wetland restorations provide the same quality of wetland, in terms of ecosystem services and biodiversity, as natural wetlands in the St. Lawrence River Valley. Water quality (pH, alkalinity, colored dissolved organic matter, phytoplankton community composition, chlorophyll-a, fecal coliform, total phosphorus, dissolved nitrate, turbidity, specific conductivity) in 17 natural and 45 restored wetlands was compared to determine whether wetland restoration provided similar physicochemical conditions as natural wetlands in the Saint Lawrence River Valley of northeastern New York State. Natural wetlands were more acidic, which was hypothesized to result from the avoidance of naturally acidic regions by farmers seeking to drain wetlands for crop and pasture use. Natural wetlands had significantly greater fecal coliform concentrations. Restored wetlands had significantly greater specific conductivity and related ions, and this is attributed to the creation of wetlands upon marine clay deposits. Other water quality indicators did not differ between restored and natural wetlands. These findings confirm other research at these same wetlands showing no substantial differences between restored and natural wetlands in major biotic indicators. Thus, we conclude that wetland restoration does result in wetlands that are functionally the same as the natural wetlands they were designed to replicate.
10
Durai, A. Job Martin, S. Kalavathy, V. Gokula e A. Muthukrishnan. "Identification of potential wetlands in Tiruchirappalli District, Tamil Nadu, India". International Journal of Environment 3, n. 1 (28 febbraio 2014): 78–84. http://dx.doi.org/10.3126/ije.v3i1.9944.
Testo completoAbstract (sommario):
Wetland maps are prerequisites for wetland inventory, development, planning, management, protection, and restoration, for conservation of wetland-dependent flora, fauna and humans. It is estimated that 15.26 million hectares exists as wetlands in India according to Space Application Centre (SAC), pertaining to wetlands having more than 56 hectares area. Past research on wetland conservation in the country has shown that micro-wetlands (satellite wetlands) around a bigger wetland act as constellation of habitat mosaic for resident and migratory waterfowls. Often, the size of these micro-wetlands is much smaller than 50 hectares. Therefore, there is a great need to map such wetlands (smaller than 50 hectares). The Tiruchirappalli district, situated in the state of Tamil Nadu, India, is selected for the present investigation to identify the potential wetlands through geo-spatial technology (GIS & RS). All the wetlands within the Tiruchirappalli district have been demarcated from 1973 applying temporal remote sensing data. A total of 2399 wetlands of various size categories have been identified in the Tiruchirappalli District, Tamil Nadu, India. DOI: http://dx.doi.org/10.3126/ije.v3i1.9944 International Journal of Environment Vol.3(1) 2014: 78-84
11
Finlayson, C. Max, Maria Grazia Bellio e John B. Lowry. "A conceptual basis for the wise use of wetlands in northern Australia — linking information needs, integrated analyses, drivers of change and human well-being". Marine and Freshwater Research 56, n. 3 (2005): 269. http://dx.doi.org/10.1071/mf04077.
Testo completoAbstract (sommario):
Australia’s north supports many wetlands. The biodiversity of these wetlands is highly regarded, but many are increasingly being affected by well recognised pressures that result in adverse change in their ecological character. The extent of the knowledge base and causes of adverse change in Australia’s tropical wetlands are reviewed with an emphasis on the linkage between direct and indirect drivers of change. Within the context of the existing knowledge base, an integrated model for collecting information on the ecological character of tropical wetlands is proposed. The model encompasses hierarchical and multi-scalar approaches to wetland inventory, assessment and monitoring and was developed largely from research undertaken in northern Australia. It is based around the concepts of wise use and maintenance of the ecological character of wetlands, which in turn emphasises the value of wetlands to people through the delivery of ecosystem services. A broader conceptual framework linking ecosystem services and human well-being to the condition of wetlands is introduced as a forerunner to considering research needs for tropical Australian wetlands. The integrated model and framework entail community consultation and the involvement of stakeholders in decisions about wetland research and management. In conclusion, it is emphasised that the maintenance of the ecological character of the wetlands of northern Australia is a task for wetland managers, users and owners in collaboration with scientists from many disciplines.
12
Mitsch, William J. "Restoration of our lakes and rivers with wetlands – an important application of ecological engineering". Water Science and Technology 31, n. 8 (1 aprile 1995): 167–77. http://dx.doi.org/10.2166/wst.1995.0290.
Testo completoAbstract (sommario):
The role of wetlands, both natural and man-made, in improving water quality of streams, rivers, and lakes is illustrated with examples of fringe, instream, and riparian wetlands. Fringe wetlands have been shown to reduce inputs to freshwater lakes, instream wetlands can improve habitat and provide some water quality function to small streams, and riparian wetlands along larger rivers provide important roles in both capturing sediments and nutrients from the river itself and serving as buffer between uplands and the river. Two major experimental riparian wetland sites in Midwestern USA are introduced: The Des Plaines River Wetland Demonstration Project and the Olentangy River Wetland Research Park.
13
Mitchell, Todd. "Native Uses of Wetlands and Natural Resources Planning: The Swinomish Indian Tribal Community's Wetlands Cultural Assessment". Practicing Anthropology 27, n. 1 (1 gennaio 2005): 11–14. http://dx.doi.org/10.17730/praa.27.1.0m16543050n28544.
Testo completoAbstract (sommario):
Wetlands are defined based upon the presence of three essential characteristics: hydrophytic vegetation; hydric soils; and wetland hydrology. Wetland inventory and wetland habitat assessments are conducted in areas where wetlands need to be identified and ranked for regulatory protection measures. Typically the following methods are used: 1) identify wetlands through existing resources and produce a preliminary wetland inventory, 2) field verify wetlands, 3) assess wetland functions and values, and 4) develop watershed ranking. In order to evaluate and assess the relative importance or level to which a wetland performs a specific function, a functional assessment of the field-verified wetlands is conducted. Detailed scientific knowledge of wetland functions, sometimes known as functions and values, is often limited, so that evaluations of the functions of individual wetlands are qualitative and largely dependent upon professional judgment. Wetland functional valuations are still an evolving science. Therefore, better methods for valuations are being researched but until such methods are in general use by the scientific research community, the current and possibly inaccurate methods are in use.
14
Xie, Wen Xia, Zhen Xu e Kun Jie Zhu. "Review of Key Technique Research on the Field of Vegetation Restoration in Beach Wetlands". Advanced Materials Research 709 (giugno 2013): 948–51. http://dx.doi.org/10.4028/www.scientific.net/amr.709.948.
Testo completoAbstract (sommario):
The study wetland vegetation restoration technology system and representative beach wetland restoration projects at home and abroad are summarized. Technology system of wetland vegetation restoration mainly includes engineering technology and biological technology. Ecological restoration research of coastal wetland in China mainly concentrated in the Yellow River Delta, the southeast coastal mangrove wetlands, coastal beaches of Jiangsu and the coastal wetlands in Shanghai Fengxian District. Finally, the issues existed in current research field were pointed out. The research fields need to be strengthened for the detailed field investigation and laboratory analysis of soil, vegetation, hydrology, meteorology, etc. According to the actual situation of wetland beaches, wetland site type will be divided. Suitable salt-tolerant plant varieties should be filtered and the mudflat wetland vegetation recovery key technologies should be explored.
15
Gxokwe, Siyamthanda, Timothy Dube e Dominic Mazvimavi. "Multispectral Remote Sensing of Wetlands in Semi-Arid and Arid Areas: A Review on Applications, Challenges and Possible Future Research Directions". Remote Sensing 12, n. 24 (21 dicembre 2020): 4190. http://dx.doi.org/10.3390/rs12244190.
Testo completoAbstract (sommario):
Wetlands are ranked as very diverse ecosystems, covering about 4–6% of the global land surface. They occupy the transition zones between aquatic and terrestrial environments, and share characteristics of both zones. Wetlands play critical roles in the hydrological cycle, sustaining livelihoods and aquatic life, and biodiversity. Poor management of wetlands results in the loss of critical ecosystems goods and services. Globally, wetlands are degrading at a fast rate due to global environmental change and anthropogenic activities. This requires holistic monitoring, assessment, and management of wetlands to prevent further degradation and losses. Remote-sensing data offer an opportunity to assess changes in the status of wetlands including their spatial coverage. So far, a number of studies have been conducted using remotely sensed data to assess and monitor wetland status in semi-arid and arid regions. A literature search shows a significant increase in the number of papers published during the 2000–2020 period, with most of these studies being in semi-arid regions in Australia and China, and few in the sub-Saharan Africa. This paper reviews progress made in the use of remote sensing in detecting and monitoring of the semi-arid and arid wetlands, and focuses particularly on new insights in detection and monitoring of wetlands using freely available multispectral sensors. The paper firstly describes important characteristics of wetlands in semi-arid and arid regions that require monitoring in order to improve their management. Secondly, the use of freely available multispectral imagery for compiling wetland inventories is reviewed. Thirdly, the challenges of using freely available multispectral imagery in mapping and monitoring wetlands dynamics like inundation, vegetation cover and extent, are examined. Lastly, algorithms for image classification as well as challenges associated with their uses and possible future research are summarised. However, there are concerns regarding whether the spatial and temporal resolutions of some of the remote-sensing data enable accurate monitoring of wetlands of varying sizes. Furthermore, it was noted that there were challenges associated with the both spatial and spectral resolutions of data used when mapping and monitoring wetlands. However, advancements in remote-sensing and data analytics provides new opportunities for further research on wetland monitoring and assessment across various scales.
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He, Ping, Zifei Mao, Yue Zou, Xueya Chen e Yuanxing Cai. "Research on Application Status of 3S Technology in Wetland". International Journal of Engineering and Technology 14, n. 2 (maggio 2022): 19–23. http://dx.doi.org/10.7763/ijet.2022.v14.1196.
Testo completoAbstract (sommario):
This paper analyzes the research status of 3S technology in China's wetlands. The research of 3S technology in wetland landscape pattern and driving force analysis is increasing day by day. Most of the research uses 3S technology to calculate the landscape index, and reveals the change rule of wetland landscape pattern characteristics with natural and human factors from the type scale and landscape scale. The use of 3S technology for wetland information extraction and dynamic monitoring research is gradually increasing. In most studies, wetland information was extracted according to different classification criteria, and spatio-temporal characteristics of wetland were analyzed based on area change, spatial distribution and shape change. With the development, planning and protection of wetland resources, the advantages of 3S technology will become more prominent.
17
Jafarzadeh, Hamid, Masoud Mahdianpari, Eric W. Gill, Brian Brisco e Fariba Mohammadimanesh. "Remote Sensing and Machine Learning Tools to Support Wetland Monitoring: A Meta-Analysis of Three Decades of Research". Remote Sensing 14, n. 23 (1 dicembre 2022): 6104. http://dx.doi.org/10.3390/rs14236104.
Testo completoAbstract (sommario):
Despite their importance to ecosystem services, wetlands are threatened by pollution and development. Over the last few decades, a growing number of wetland studies employed remote sensing (RS) to scientifically monitor the status of wetlands and support their sustainability. Considering the rapid evolution of wetland studies and significant progress that has been made in the field, this paper constitutes an overview of studies utilizing RS methods in wetland monitoring. It investigates publications from 1990 up to the middle of 2022, providing a systematic survey on RS data type, machine learning (ML) tools, publication details (e.g., authors, affiliations, citations, and publications date), case studies, accuracy metrics, and other parameters of interest for RS-based wetland studies by covering 344 papers. The RS data and ML combination is deemed helpful for wetland monitoring and multi-proxy studies, and it may open up new perspectives for research studies. In a rapidly changing wetlands landscape, integrating multiple RS data types and ML algorithms is an opportunity to advance science support for management decisions. This paper provides insight into the selection of suitable ML and RS data types for the detailed monitoring of wetland-associated systems. The synthesized findings of this paper are essential to determining best practices for environmental management, restoration, and conservation of wetlands. This meta-analysis establishes avenues for future research and outlines a baseline framework to facilitate further scientific research using the latest state-of-art ML tools for processing RS data. Overall, the present work recommends that wetland sustainability requires a special land-use policy and relevant protocols, regulation, and/or legislation.
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Roy Ricardo Nababan, Badia, Agus Setiawan e Nuning Nurcahyani. "Keanekaragaman Jenis Burung Di Lahan Basah Way Pegadungan Desa Rajawali Kecamatan Bandar Surabaya Kabupaten Lampung Tengah". Jurnal Sylva Lestari 3, n. 1 (9 febbraio 2015): 71. http://dx.doi.org/10.23960/jsl1371-80.
Testo completoAbstract (sommario):
ABSTRACT Way Pegadungan wetlands is a wetland closure difference between the two riparian communities. One of the wetlands is converted into paddies fields, while the other is a natural wetland which are still overgrown with trees. To determine diversity differences in bird species between two wetlands research communities, the point count method (IPA) and line transects were used. Observations made by the stationary point count and record the birds found. Each community was taken 6 points count and observed for 3 days. Research encountered 41 species of birds included in the 17 families with a total of 796 individual in paddies fields and 46 birds species with total of 655 individuals from 17 families of individuals in natural wetlands. Natural wetlands diversity index was 3.44 with equality index of 0.90, this value is higher than the wetlands changed into paddies fields with a diversity index of 2.91, and in a stable condition with equality index of 0.78. Both wetlands communities have the same identical species approach (IS = 1) with a similarity index of 0.73. Key words: birds, diversity, wetlands, Way Pegadungan
19
Dangol, Dharma Raj, e Subodh Khanal. "Status of "Wetland ecology" education and research at the Department of Environmental Science, Institute of Agriculture and Animal Science of the Tribhuvan University, Nepal". Nepalese Journal of Biosciences 3, n. 1 (1 dicembre 2013): 78–86. http://dx.doi.org/10.3126/njbs.v3i1.41451.
Testo completoAbstract (sommario):
Wetlands are considered as the most productive ecosystems and cradles of biodiversity harboring a wide variety of flora and fauna. They maintain and provide a variety of environmental services to the human beings including fish and wildlife habitats, flood protection, erosion control and water quality maintenance (Tiner, 1989). Despite their value, wetlands have suffered from widespread destruction due to misuses and abuses (CP, 2005). Wetlands are threatened by population growth, increased exploitation of biological resources, timber harvest, pollution of various forms, development activities and other forms of mis-management (Kerr et al., 2002). So, wetlands need to be preserved and utilized wisely for the livelihood enhancement. To implement this task, countries need a sufficient number of experts and technical staff who are qualified and enthusiastic to work in the field of wetland conservation. So, the role of universities become crucial to launch academic programs for producing man power that can understand wetland ecology and their services and influence and make policy for wetland conservation and management. Because of their widespread distribution and biological, chemical, and physical complexity, wetlands are excellent “living laboratories” for teaching (Baldwin, 2007).
20
Liu, Jing. "Research on Sewage Treatment of Constructed Wetland on Expressway". Advanced Materials Research 864-867 (dicembre 2013): 1281–86. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1281.
Testo completoAbstract (sommario):
As a new type of ecology treatment technology, constructed wetland has been widely utilized in the sewage disposal system. The paper researches into the constructed wetlands basic concept, structural constitutions and the sewage disposal mechanism. It has been certified that the constructed wetland technology play an important role in decreasing point source pollution on expressway.
21
Stengård, Emelie, Aleksi Räsänen, Carla Sofia Santos Ferreira e Zahra Kalantari. "Inventory and Connectivity Assessment of Wetlands in Northern Landscapes with a Depression-Based DEM Method". Water 12, n. 12 (30 novembre 2020): 3355. http://dx.doi.org/10.3390/w12123355.
Testo completoAbstract (sommario):
Wetlands, including peatlands, supply crucial ecosystem services such as water purification, carbon sequestration and regulation of hydrological and biogeochemical cycles. Peatlands are especially important as carbon sinks and stores because of the incomplete decomposition of vegetation within the peat. Good knowledge of individual wetlands exists locally, but information on how different wetland systems interact with their surroundings is lacking. In this study, the ability to use a depression-based digital elevation model (DEM) method to inventory wetlands in northern landscapes and assess their hydrological connectivity was investigated. The method consisted of three steps: (1) identification and mapping of wetlands, (2) identification of threshold values of minimum wetland size and depth, and (3) delineation of a defined coherent area of multiple wetlands with hydrological connectivity, called wetlandscape. The results showed that 64% of identified wetlands corresponded with an existing wetland map in the study area, but only 10% of the wetlands in the existing map were identified, with the F1 score being 17%. Therefore, the methodology cannot independently map wetlands and future research should be conducted in which additional data sources and mapping techniques are integrated. However, wetland connectivity could be mapped with the depression-based DEM methodology by utilising information on upstream and downstream wetland depressions, catchment boundaries and drainage flow paths. Knowledge about wetland connectivity is crucial for understanding how physical, biological and chemical materials are transported and distributed in the landscape, and thus also for resilience, management and protection of wetlandscapes.
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Lei, Zhi Yi, e Chang Xin Xu. "Wetland Area Holdings in the Yangtze River Estuary". Advanced Materials Research 518-523 (maggio 2012): 6103–6. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.6103.
Testo completoAbstract (sommario):
Wetland resource in Shanghai city is very abundant, and the contradiction between human development and land limit is very violent, so that the development and utilization of wetlands is inevitable. It’s an important way to reclaim wetland to solve the contradiction in Shanghai. Protection can not only take the natural state of wetlands to maintain, and should not be only one habitat model. This paper proposes wetland area balance principle. Then the feasibility of wetland area balance is studied, and wetland area-holdings is proposed as a new concept. Select Jiuduansha wetland, East Chongming wetland and Nanhui beach wetland as examples, the processes of estuarine wetlands development and silting up are studied, research shows that the principle of area balance can be achieved in Yangtze River Estuary.
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Junk, Wolfgang J. "Long-term environmental trends and the future of tropical wetlands". Environmental Conservation 29, n. 4 (dicembre 2002): 414–35. http://dx.doi.org/10.1017/s0376892902000310.
Testo completoAbstract (sommario):
Tropical wetlands assume important functions in the landscape and contribute considerably to the welfare of large parts of the human population, but they are seriously threatened because they are considered free resources of land and water. This review summarizes long-term environmental trends for tropical wetlands and predicts their future to the time horizon 2025. Many tropical countries do not have the economic strength, scientific and technological capacity, and/or administrative infrastructure to adequately react to the challenges of increasing population pressure and globalization of the economy with respect to the sustainable use of the resources. Furthermore, political instability and armed conflicts affect large areas in several tropical countries, hindering wetland research and management. Detailed wetland inventories are missing in most countries, as are plans for a sustainable management of wetlands in the context of a long-term integrated watershed management. Despite large regional variability, a continental ranking shows, in decreasing order of wetland integrity, South America, Africa, Australia and Asia, while efforts to mitigate human impacts on wetlands are largest and most advanced in Australia. Analysis of demographic, political, economic and ecological trends indicates fairly stable conditions for wetlands in tropical Australia, slight deterioration of the large wetland areas in tropical South America excepting the Magdalena and Cauca River flood plains where human population is larger, rapidly increasing pressure and destruction on many African and Central American wetlands and serious threats for the remaining wetlands in tropical Asia, by the year of 2025. Policy deficiencies, deficient planning concepts, limited information and awareness and institutional weakness are the main administrative reasons for wetland degradation and must be overcome to improve wetland management and protection in future. Intensification of international cooperation and assistance is considered of fundamental importance for most tropical countries to solve problems related to wetland research, protection and sustainable management.
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Sharma, Rajneesh, Deepak R. Mishra, Matthew R. Levi e Lori A. Sutter. "Remote Sensing of Surface and Subsurface Soil Organic Carbon in Tidal Wetlands: A Review and Ideas for Future Research". Remote Sensing 14, n. 12 (20 giugno 2022): 2940. http://dx.doi.org/10.3390/rs14122940.
Testo completoAbstract (sommario):
Tidal wetlands, widely considered the most extensive reservoir of soil organic carbon (SOC), can benefit from remote sensing studies enabling spatiotemporal estimation and mapping of SOC stock. We found that a majority of the remote-sensing-based SOC mapping efforts have been focused on upland ecosystems, not on tidal wetlands. We present a comprehensive review detailing the types of remote sensing models and methods used, standard input variables, results, and limitations for the handful of studies on tidal wetland SOC. Based on that synthesis, we pose several unexplored research questions and methods that are critical for moving tidal wetland SOC science forward. Among these, the applicability of machine learning and deep learning models for predicting surface SOC and the modeling requirements for SOC in subsurface soils (soils without a remote sensing signal, i.e., a soil depth greater than 5 cm) are the most important. We did not find any remote sensing study aimed at modeling subsurface SOC in tidal wetlands. Since tidal wetlands store a significant amount of SOC at greater depths, we hypothesized that surface SOC could be an important covariable along with other biophysical and climate variables for predicting subsurface SOC. Preliminary results using field data from tidal wetlands in the southeastern United States and machine learning model output from mangrove ecosystems in India revealed a strong nonlinear but significant relationship (r2 = 0.68 and 0.20, respectively, p < 2.2 × 10−16 for both) between surface and subsurface SOC at different depths. We investigated the applicability of the Soil Survey Geographic Database (SSURGO) for tidal wetlands by comparing the data with SOC data from the Smithsonian’s Coastal Blue Carbon Network collected during the same decade and found that the SSURGO data consistently over-reported SOC stock in tidal wetlands. We concluded that a novel machine learning framework that utilizes remote sensing data and derived products, the standard covariables reported in the limited literature, and more importantly, other new and potentially informative covariables specific to tidal wetlands such as tidal inundation frequency and height, vegetation species, and soil algal biomass could improve remote-sensing-based tidal wetland SOC studies.
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Barakagira, Alex, e Anton H. de Wit. "The role of wetland management agencies within the local community in the conservation of wetlands in Uganda". Environmental & Socio-economic Studies 7, n. 1 (1 marzo 2019): 59–74. http://dx.doi.org/10.2478/environ-2019-0006.
Testo completoAbstract (sommario):
Abstract Wetlands in Uganda are believed to be socio-economically important for providing water for drinking, irrigation, fisheries, recreation, transport and agriculture among others. Bearing in mind the host of benefits wetlands provide to local communities, if they are harnessed without the mind, they could end up being over utilized and ultimately degraded and not continue to provide a stream of functions, attributes and services. This could be one of the primary reasons why special Departments and Institutions like the National Environment Management Authority and Wetlands Management Department were created to manage the country’s natural resources including wetlands. The study was initiated to explore how wetland management agencies influence members of the local community on matters concerning the conservation of wetlands in Uganda. A cross-sectional research design was used to collect qualitative and quantitative data. A questionnaire survey was conducted amongst four hundred households to collect information concerning the role of wetland management agencies among members of the local community for the conservation of wetlands in Uganda. More information was obtained from senior officials from the National Environment Management Authority, Wetland Management Department, and District Natural Resources Officers from the study area using a non-structured questionnaire. Key informant interviews and direct observations were also used to collect data. The study revealed that gathering materials for building and for making crafts, agricultural activities, unsustainable mining of clay and sand for building contributed to wetland degradation. Some circumstances like high population growth, unclear wetland ownership, unawareness of the indirect functions of wetlands also contributed to wetland degradation. It was found that the wetland management agencies have been ineffective towards the conservation of wetlands mainly due to inadequate funding, political interference, and lack of specific judges for wetland related court cases among others. For wetland management agencies to effectively perform their duties leading to the protection and conservation of wetlands in Uganda, the study recommends that members of the local community should be allowed to practice wetland edge farming, fish farming in ponds constructed in wetlands, and to leave some parts of these vital wetlands that have been reclaimed to regenerate, in addition to addressing the main reported hindrances that are stifling the smooth running of the activities of the agencies.
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Messer, Tiffany, Kyle Douglas-Mankin, Natalie Nelson e James Randall Etheridge. "Wetland Ecosystem Resilience: Protecting and Restoring Valuable Ecosystems". Transactions of the ASABE 62, n. 6 (2019): 1541–43. http://dx.doi.org/10.13031/trans.13578.
Testo completoAbstract (sommario):
HighlightsWe provide context and perspectives on articles in the Wetland Ecosystem Resilience collection.Insights gained on wetland resilience to sea-level rise and climate change, land use and drainage, and nutrients. Abstract. The objective of this article is to introduce a collection of articles that explore current research and scientific thought on wetland ecosystem resilience. The collection contains articles on wetland resilience to climate change, agricultural land use-driven change, and recreational land use, along with evaluations of wetland resilience through high-resolution monitoring and modeling tools. Wetland settings in the U.S. span tidal marshes and coastal plain non-riverine wetlands in North Carolina, prairie potholes in Iowa, Appalachian floodplain wetlands, and floating treatment wetlands in the Midwest. The studies in this collection found vertical accretion rates of 0.7 to 4.0 mm year-1 in a tidal marsh, a wide range of potential wetland hydroperiod responses to climate change, substantial decreases in inundation period, crop yield, and surface-water nitrate (but increases in phosphorus) in artificially drained potholes, and nitrate removal in carbon-amended floating treatment wetlands. Further work is needed to better understand how to design and enhance wetland systems in agricultural regions, better preserve wetland ecosystem services in areas affected by land use and climate change, and provide technical standards for the wide range of designs currently used for wetland treatment systems. Keywords: Agricultural wetlands, Resiliency, Temporal data, Treatment wetlands, Water chemistry, Water quality, Water treatment
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King, Susan K., e Stephen C. Richter. "Reproductive Ecology and Nesting Site Characteristics of Four-Toed Salamanders (Hemidactylium scutatum) in Natural and Constructed Upland-Embedded Wetlands on the Appalachian Plateau, Kentucky". Diversity 14, n. 11 (18 novembre 2022): 995. http://dx.doi.org/10.3390/d14110995.
Testo completoAbstract (sommario):
Many forested freshwater wetlands have been altered or destroyed, and wetlands are constructed to offset loss. However, they do not always replace the function of natural wetlands. It is important to understand how features of the habitat differ between types of wetlands and whether constructed wetlands provide an adequate habitat for species adapted to natural wetlands. Our objectives were to measure the characteristics of Four-toed Salamanders’ nesting habitat and determine which factors contribute to the abundance of eggs and nests in natural and constructed upland-embedded wetlands within a ridgetop ecosystem in eastern Kentucky. We located and examined characteristics for 207 nests in twelve wetlands and measured variables at the nest level and at the wetland level. The best predictor of the number of eggs and number of nests was amount of moss at the wetland. These measures of reproductive effort were similar between types of wetlands, but the number of eggs per nest was higher in constructed wetlands and inversely related to amount of moss, highlighting a deficit in nesting habitat. Research of embryonic and larval survival is needed but based on data from other amphibian species in this system, we predict that the survival of Four-toed Salamanders’ larvae is low in constructed wetlands with permanent hydrology. Restoration of constructed wetlands should address the need for moss as nesting substrate and drying of the wetland to reduce the abundance and diversity of predators of larvae.
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Liang, Haiji, Chong Chen, Kexin Wang e Guanqiong Ye. "Long-Term Spatiotemporal Changes in Ecosystem Services Caused by Coastal Wetland Type Transformation in China’s Hangzhou Bay". Journal of Marine Science and Engineering 10, n. 11 (19 novembre 2022): 1781. http://dx.doi.org/10.3390/jmse10111781.
Testo completoAbstract (sommario):
Coastal wetlands provide essential ecosystem services, while usually experiencing land transformation or degradation mainly due to intense anthropogenic activities and climate changes. Understanding the changes in wetlands ecosystem services is essential to decision makers for generating sound coastal planning. Hangzhou Bay is rich in wetland resources, and the urbanization of Hangzhou Bay in the past three decades has caused fundamental changes in the wetlands in the region. Based on the remote sensing images of the Hangzhou Bay area from 1990 to 2020, this paper analyzes the land use situation of the Hangzhou Bay area in seven periods. This paper calculates the area transfer matrix of various types of wetlands. It uses the InVEST model to evaluate the changes in the function of wetland ecosystem services in the Hangzhou Bay area. Hangzhou Bay wetlands show a trend of transferring natural wetlands to artificial and non-wetlands from 1990 to 2020. Carbon stocks fell by 14.24%. The annual water production decreased by 33.93% and then returned to the original level. The area of habitat degradation increased by 79.94%. The main influencing factors are paddy field degradation, increase in non-wetland area, and decrease in sea area. This paper proposes that the development and construction of farmland in the “red line” area and established wetland reserves are prohibited, and to strengthen the training of wetland management personnel, establish a sound decision-making consultation mechanism, and increase the scientific research expenditure on wetlands in the region.
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Lu, Xiao Feng, Xin Hao Hao, Tie Liang Wang e Yu Long Zhang. "The Ecological Frangibility Evaluation in Shuangtai Estuary Wetland". Applied Mechanics and Materials 295-298 (febbraio 2013): 833–38. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.833.
Testo completoAbstract (sommario):
According to the increasing degradation of Shuangtai Estuary Wetland, The paper makes an analysis and research on the pressure indexes of Shuangtai Estuary Wetland influenced and broken by human activities, in order to provide theoretical basis for future researches and management. The method of PSR was used to decide factor weights. The results indicated that the index of wetlands ecological frangibility evaluation is 0.15. According to the classification grade of wetlands ecological frangibility, the wetlands ecological frangibility is potential frangibility.
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Wang, Yeqiao, e Hervé Yésou. "Remote Sensing of Floodpath Lakes and Wetlands: A Challenging Frontier in the Monitoring of Changing Environments". Remote Sensing 10, n. 12 (5 dicembre 2018): 1955. http://dx.doi.org/10.3390/rs10121955.
Testo completoAbstract (sommario):
Monitoring of changing lake and wetland environments has long been among the primary focus of scientific investigation, technology innovation, management practice, and decision-making analysis. Floodpath lakes and wetlands are the lakes and associated wetlands affected by seasonal variations of water level and water surface area. Floodpath lakes and wetlands are, in particular, sensitive to natural and anthropogenic impacts, such as climate change, human-induced intervention on hydrological regimes, and land use and land cover change. Rapid developments of remote sensing science and technologies, provide immense opportunities and capacities to improve our understanding of the changing lake and wetland environments. This special issue on Remote Sensing of Floodpath Lakes and Wetlands comprise featured articles reporting the latest innovative research and reflects the advancement in remote sensing applications on the theme topic. In this editorial paper, we review research developments using state-of-the-art remote sensing technologies for monitoring dynamics of floodpath lakes and wetlands; discuss challenges of remote sensing in inventory, monitoring, management, and governance of floodpath lakes and wetlands; and summarize the highlights of the articles published in this special issue.
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Gell, P. A., C. M. Finlayson e N. C. Davidson. "Understanding change in the ecological character of Ramsar wetlands: perspectives from a deeper time – synthesis". Marine and Freshwater Research 67, n. 6 (2016): 869. http://dx.doi.org/10.1071/mf16075.
Testo completoAbstract (sommario):
The Convention for Wetlands was signed in 1971 as part of a global measure to mitigate the loss and degradation of the world’s wetlands. Signatory nations nominate wetlands as internationally important and commit to maintaining their ‘ecological character’. In many cases the character that has been maintained was that occurring at the time of nomination with scant attention to the variability and change that occurs over longer periods. Palaeoclimate and palaeoecological research now reveals a diverse array of conditions in wetlands in the past and attests that any recently identified condition may be transient. The research further reveals the considerable magnitude and antiquity of the impact of people on wetlands. Hence the site description used by wetland managers would benefit from the provision of a longer-term perspective of change. The changing state of wetlands provides a dilemma for wetland managers. In response, a workshop on understanding change in wetlands was held in Queenscliff, Australia, in November 2013 to draw together perspectives of change from neo- and palaeoecological sources to enable the formulation of new pathways of assessment to better accommodate the dynamic nature of wetlands. A synthesis of the information provided at the workshop is provided in this paper.
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Zhang, Yanqin, Xianli You, Shanjun Huang, Minhua Wang e Jianwen Dong. "Knowledge Atlas on the Relationship between Water Management and Constructed Wetlands—A Bibliometric Analysis Based on CiteSpace". Sustainability 14, n. 14 (6 luglio 2022): 8288. http://dx.doi.org/10.3390/su14148288.
Testo completoAbstract (sommario):
Water management is a crucial resource conservation challenge that mankind faces, and encouraging the creation of manmade wetlands with the goal of achieving long-term water management is the key to long-term urban development. To summarise and analyse the status of the research on the relationship between water management and constructed wetlands, this paper makes use of the advantages of the bibliometric visualization of CiteSpace to generate country/region maps and author-collaboration maps, and to analyse research hotspots and research dynamics by using keywords and literature co-citations based on 1248 pieces of related literature in the core collection in the Web of Science (WoS) database. The existing research shows that the research content and methods in the field of constructed-wetland and water-management research are constantly being enriched and deepened, including the research methods frequently used in constructed wetlands in water management and in the research content under concern, the functions and roles of constructed wetlands, the relevant measurement indicators of the purification impact of constructed wetlands on water bodies, and the types of water bodies treated by constructed wetlands in water management. We summarise the impact pathways of constructed wetlands on water management, as well as the impact factors of constructed wetlands under water-management objectives, by analysing the future concerns in the research field to provide references for research.
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Mustika Edi, Armanto, Wildayana Elisa e Syakina Bella. "Dynamics, Degradation and Future Challenges of Wetlands in South Sumatra Province, Indonesia". E3S Web of Conferences 68 (2018): 04001. http://dx.doi.org/10.1051/e3sconf/20186804001.
Testo completoAbstract (sommario):
This paperaims to analyzedynamics, degradation and future challenges of wetlands in South Sumatra Province, Indonesia. Research methods using Focus Group Discussion (FGD), research data and information are processedusing SPSS program. There are four dominant types of wetlands in South Sumatra, namely lebak swamps, tidal swamps, rivers, lakes, and peatlands. The area of lebakswamps has dominantly increased from year to year, while other wetlands have decreased extensively over the years. All species living in wetlands have decreased in number; the most dominant decline was experienced by fish, gymnosperm and fern and at least in moss and angiosperm. The main causes of wetlands degradation are weaken forcement and legal compliance of inadequate policies, reclamation and excessive drainage. Current efforts to protect the wetlands are restoration, groundwater control, fish population conservation and wetland reserves.
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Li, Yangli, Gaoyuan Wang, Tian Chen, Rui Zhang, Long Zhou e Li Yan. "Nature-Based Solutions in “Forest–Wetland” Spatial Planning Strategies to Promote Sustainable City Development in Tianjin, China". Land 11, n. 8 (3 agosto 2022): 1227. http://dx.doi.org/10.3390/land11081227.
Testo completoAbstract (sommario):
Nature-based solutions are some of the most effective strategies to promote sustainable city development; however, existing research on NbS is mostly comprised of single variable studies rather than multiple variables. The purpose of this study was to explore the possibility of extending the NbS of a single variable to two variables for the better development of sustainable cities. Both forestation and wetland restoration are regarded as NbS for sustainable city development. The research approach of “forest–wetland” NbS was proposed and centers on the process and core issues of traditional NbS. Taking Tianjin as an example, the spatial patterns of forests and wetlands, correlation between the spatial distribution of forests and wetlands, and spatial correlation between the areas of forest growth and wetland growth within a certain distance in different years were studied using a spatial distribution pattern analysis, geographic concentration analysis, kernel density estimation and spatial autocorrelation analysis. Based on the core issues of NbS and the above spatial analysis, a “forest–wetland” spatial planning strategy was formulated. The main conclusions are as follows: forest and wetland were negatively correlated in the whole area of Tianjin, forest resources w mainly located in north, while wetland resources were mainly located in south. Compared with forests, the spatial distribution of wetlands in Tianjin was more balanced. There exist synergy and trade-offs between forest and wetland area under certain circumstances. Growth of forests was positively correlated with the growth of wetlands, within a distance of 0–400 m from 2000 to 2010, and within a distance of 0–600 m from 2010 to 2020. An increase in forest area will lead to an increase in evaporation, which in turn will hinder the growth of wetlands in Tianjin. Forest–wetland ecological network could promote synergistic between forest and wetland, and grey infrastructure to reduce potential trade-off between forest and wetland.
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Tsai, Yu Jr. "Sustainable Management of Decontamination Constructed Wetlands: Research on the Industrial and Scientific Development of Aquatic Plants". Modern Environmental Science and Engineering 8, n. 5 (22 maggio 2022): 306–9. http://dx.doi.org/10.15341/mese(2333-2581)/05.08.2022/008.
Testo completoAbstract (sommario):
This pilot paper focuses on the suburban constructed wetlands that operate for the main purpose of wastewater treatment and explores the possibility of decontamination constructed wetlands based on the industry-academic model to establish a positive circular economy production chain from the perspective of a sustainable economy. Through a four-stage humanistic investigation process, using focus interviews, literature analysis, expert opinions, field investigations, patent search analysis, context, and decision analysis processes, it is proposed to use plants around the wetland as production products to develop manufacturing, electricity, and gas supply possibility of business and construction products as the main product. The related aquatic plants are developed and utilized in the Republic of China patents, namely, watery plants> root-floating plants> floating water plants> submerged water plants. Among them, the water-protruding plants are fibrous. It is most characterized in textiles, papermaking, board, furniture, etc., followed by biological nutrient solutions or extracts used for fertilization, control, or beauty. Therefore, it is still possible to reuse the wetland plants to develop related innovative products. Provide sustainable management of decontamination constructed wetland as a reference for wise use. Key words: constructed wetlands, sewage treatment, sustainable development, aquatic crops, industry-academic cooperation
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Berego, Yohannes Seifu, Solomon Sorsa Sota, Mihret Dananto Ulsido e Embialle Mengistie Beyene. "Treatment Performance Assessment of Natural and Constructed Wetlands on Wastewater From Kege Wet Coffee Processing Plant in Dale Woreda, Sidama Regional State, Ethiopia". Environmental Health Insights 16 (gennaio 2022): 117863022211427. http://dx.doi.org/10.1177/11786302221142749.
Testo completoAbstract (sommario):
Constructed wetlands are engineered systems built to use natural processes and remove pollutants from contaminated water in a more controlled environment. The research was an experimental research carried out to assess the effectiveness of natural and constructed wetland systems in the treatment of coffee wastewater. The 2 vertical flow constructed wetland was built. The first wetland covered an area of 132 m2. It has 12 m width and 11 m length. Open space is constructed between 2 constructed wetlands with a dimension of 11 m × 3 m × 1 m. The second wetland was constructed and its function is similar to the first one, from this wetland water is discharged to the river. The construction of the wetland is accomplished by constructing 20 cm wide furrows with a spacing of 30 cm. Vetiver grasses have planted with a spacing of 20 cm intervals. The physicochemical data were recorded, organized, and analyzed using R software (version 4.1) and Microsoft Excel. Data were processed using parametric (one-way ANOVA) and nonparametric (Mann-Whitney’s U test) statistical tests of homogeneity. One-way analysis of Variance (ANOVA) was used to determine the significance of differences in variations in physicochemical variables within the constructed wetland sites. Tukey’s multiple comparisons for differences between means were also assessed. Findings indicated that a natural wetland had a mean influent and effluent of total suspended solids (TSS) of 2190.78 ± 448.46 mg/l and 972.67 ± 234.312 mg/l, respectively. A Mann-Whitney U test revealed that TSS were significantly higher in natural wetland (median = 1551.50) compared to constructed wetland (median = 922.5), U = 676.5, z = −2.435, P = .015, r = .257. Natural wetlands had a mean influent of biological oxygen demand (BOD) was 4277.94 ± 157.02 mg/l, while in the effluent of BOD it was 326.83 ± 112.24 mg/l. While in constructed wetland it was 4192.4 ± 191.3 mg/l, 782.72 ± 507.6 mg/l, and 88.28 ± 20.08 mg/l in influent, middle, and effluent respectively. Average chemical oxygen demand (COD) value at influent in natural wetlands was 8085.61 ± 536.99 mg/l and in the effluent it was 675.33 ± 201.4 mg/l. In constructed wetland, it was found to be 8409.8 ± 592.9, 1372.6 ± 387.94, and 249.0 ± 7.68 for influent, middle, and effluent respectively. Comparatively, the purification efficiency of organic pollutants (TSS, BOD, and COD) of constructed wetlands was better than natural wetlands, whereas natural wetlands had better purification efficiency of nitrogen compounds such as ammonium, nitrite, and nitrate. On average, removal rates for nitrogen compounds were 39.53% and −24.41% for ammonium, 79.44% and 55.4% for nitrite, and 68.90% and 60.6% for nitrate in natural and constructed wetlands respectively, while the phosphate removal rate was 43.17% and 58.7% in natural and constructed wetlands, respectively. A Mann-Whitney U test revealed that there is no significance difference in nitrite, nitrate, ammonium, and phosphate concentration between natural and constructed wetlands( P > .05). Based on these results, both systems of treatment were effective in treating the coffee effluent since most of the values obtained were below the permissible EEPA limits. Even though the constructed wetland treatment plant performed better overall, in comparison, the natural wetlands had better purification efficiency for nitrogen compounds like ammonium, nitrite, and nitrate and the constructed wetlands had better purification efficiency for organic pollutants (TSS, BOD, and COD).
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Li, Hong, Hong Hu Zeng e Yan Peng Liang. "Removal of Organochlorine Pesticides in Constructed Wetlands". Applied Mechanics and Materials 692 (novembre 2014): 40–43. http://dx.doi.org/10.4028/www.scientific.net/amm.692.40.
Testo completoAbstract (sommario):
Organochlorine pesticides have had a wide and long history of applications in many countries around the world, which cause serious environmental problems. Constructed wetlands are considered an effective means of removal of organochlorine pesticides. This study describes the constructed wetland and applications of organochlorine pesticides contamination in constructed wetlands, and focuses on purification for organochlorine pesticides of microorganisms and plants in constructed wetlands. Then discussed constructed wetlands removal influence factors of organochlorine pesticides. And put forward some recommendations in research.
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Melati, Aisyah, e Bani Noor Muchamad. "STASIUN RISET BEKANTAN PADA LAHAN BASAH". LANTING JOURNAL OF ARCHITECTURE 10, n. 1 (28 febbraio 2021): 54–72. http://dx.doi.org/10.20527/lanting.v10i1.625.
Testo completoAbstract (sommario):
Wetlands are a natural habitat for endemic animals of South Kalimantan, namely proboscis monkeys (Nasalis larvatus). These primates are one indicator in wetlands conservation, but now the status of proboscis monkeys is endangered which means wetlands are naturally also damaged. This makes The Indonesian Proboscis Monkey Friends Foundation worried about the preservation of these primates who are endangered in a side the number of foreign researchers who are interested in proboscis monkeys so it also weakens status proboscis monkeys as endemic animals.The Indonesian Proboscis Monkey Friends Foundation wants the proboscis monkey in South Kalimantan to become an identity in the area along with the wetland ecosystem which is the habitat of proboscis monkeys. Therefore a fundamental problem with the design of the Proboscis Monkey Research Station on Wetlands is how the design of the proboscis research station on wetlands is in harmony with natural conditions around it so that it can become the identity of the region. Settlement the problem was solved through the metabolism-organic method and the visual identity-metaphor method. The metabolism-organic method is the solution to the problem of harmony building with nature, while the visual identity-metaphor method is the solution in the matter of regional identity. Based on the two methods, the concept proposed for this design is the concept of "subject-object interaction" which is realized through the concept of "wetland ecology". This concept of "subject-object interaction and wetland ecology" is a concept that elevates interactions between researchers and wetland organisms such as proboscis monkeys by entering the wetland elements into the design of this research station.
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Li, Tianjie, Yang Jin e Yan Huang. "Water quality improvement performance of two urban constructed water quality treatment wetland engineering landscaping in Hangzhou, China". Water Science and Technology 85, n. 5 (21 febbraio 2022): 1454–69. http://dx.doi.org/10.2166/wst.2022.063.
Testo completoAbstract (sommario):
Abstract For typical wastewater treatment processes of urban sewage, plants are often noneffective to improve water qualities of lightly polluted domestic sewage, and urban constructed water quality treatment (WQT) wetlands designed with engineering landscape methods are utilized to optimize both water qualities and landscape values in recent years. The research determines the effects of two typical ecological engineering landscaping projects of urban constructed WQT wetlands by analysing their effects of wastewater quality improvements. Differences of water quality indicators (WQI) respectively among different treatment stages of wetlands includes surface flow wetland, vertical flow wetland, floating wetland islands etc., which have been measured and compared. Evaluation of urban constructed WQT wetlands engineering landscaping has been concluded based on comparisons among hydrological indicators and water quality indicators, i.e. pH, DO, NH3-N, CODCr, TP. Removal effects of individual indicators, includes NH3-N, CODCr and TP during different treatment stages have been quantitatively analysed. In accordance with quantitative analysis, benefits and deficiencies of practical landscape design of urban constructed WQT wetlands are concluded. By adapting proper principles in engineering landscaping, environmental and economic benefits can be achieved to create sustainable landscapes of urban constructed WQT wetlands.
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Polajnar Horvat, Katarina, e Ales Smrekar. "The Wetland Contract as a Tool for Successful Wetland Governance: A Case Study of Ljubljansko Barje Nature Park, Slovenia". Sustainability 13, n. 1 (5 gennaio 2021): 425. http://dx.doi.org/10.3390/su13010425.
Testo completoAbstract (sommario):
Our research focuses on implementing multilevel governance of wetlands to achieve an effective participatory process and its overall positive effects on wetland ecosystems and their protection as well as on local sustainable development. The aim of the research is to develop a methodology for establishing the Wetland Contract, a voluntary agreement to foster sustainable management and development of wetlands, to ensure greater coordination and consensus building between various stakeholders involved in management and to limit conflicts between preservation issues and economic activities in wetlands. The Wetland Contract and the integration process for establishing it in Ljubljansko barje Nature Park proved itself able to overcome conflicts between institutional and legal jurisdiction and is showing itself to be a dynamic path capable of activating a desirable relationship between various interests and supporting new forms of multi-sectoral stakeholder participation in wetland management. It has also contributed to a dialogue and shared responsibility among stakeholders.
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Niwa, Hideyuki, e Takumi Hirata. "A New Method for Surveying the World’s Smallest Class of Dragonfly in Wetlands Using Unoccupied Aerial Vehicles". Drones 6, n. 12 (17 dicembre 2022): 427. http://dx.doi.org/10.3390/drones6120427.
Testo completoAbstract (sommario):
Field surveys in wetlands are limited by the difficulty in accessing the site, hazards during surveys, and the risk of disturbing the ecosystem. Thus, the use of unoccupied aerial vehicles (UAVs) can overcome these limiting factors and can assist in monitoring small organisms, such as plants and insects, that are unique to wetlands, aiding in wetland management and conservation. This study aimed to demonstrate the effectiveness of a survey method that uses a small drone equipped with a telephoto lens to monitor dragonflies, which are unique to wetlands and have been difficult to survey quantitatively, especially in large wetlands. In this study, the main target species of dragonflies was Nannophya pygmaea, which is the world’s smallest dragonfly (about 20 mm long). The study area was Mizorogaike wetland (Kita Ward, Kyoto City, Japan). The UAV was flown at a low speed at an altitude of 4 m to 5 m, and images were taken using 7× telephoto lens on Mavic 3 (7× optical and 4× digital). A total of 107 dragonflies of seven species were identified from the photographs taken by the drone. N. pygmaea, about 20 mm long, was clearly identified. Eighty-five dragonflies belonging to N. pygmaea were identified from the images. Thus, by using a small drone equipped with a telephoto lens, the images of N. pygmaea were captured, and the effects of downwash and noise were reduced. The proposed research method can be applied to large wetlands that are difficult to survey in the field, and can thus provide new and important information pertaining to wetland management and conservation. This research method is highly useful for monitoring wetlands as it is non-invasive, does not require the surveyor to enter the wetland, requires little research effort, and can be repeated.
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Ramatsabana, Phatsimo, Jane Tanner, Sukhmani Mantel, Anthony Palmer e Gloria Ezenne. "Evaluation of Remote-Sensing based Estimates of Actual Evapotranspiration over (Diverse Shape and Sized) Palmiet Wetlands". Geosciences 9, n. 12 (22 novembre 2019): 491. http://dx.doi.org/10.3390/geosciences9120491.
Testo completoAbstract (sommario):
Accurately quantifying actual evapotranspiration (ETa) over wetlands is important for the improved management of these ecosystems, since 65% of them are threatened by clearing or drainage in South Africa. This study evaluated a range of available estimates of ETa over six palmiet wetlands, which are key ecological structures in terms of water regulation and sediment trapping. The research compared three remote sensing based products (a local product, FruitLook, and two global data products, MOD16 ET and EEFlux) across different rainfall years (2008 to 2019). Their outputs were validated, where possible, with limited ground-based scintillometer data on the Krom palmiet wetland, which indicated that MOD16 and EEFlux were most representative of ground-based measurements. We also compared the small pixel size EEFlux data over three wetlands with ETa over increasing buffers of land cover (100, 500, 1000 m) in order to validate the perception of these wetlands being high water users. While larger wetlands had slightly higher evaporative demands than adjacent areas, ETa over a small wetland was similar to neighboring land cover. The results indicate that palmiet wetland ETa is highly variable and dependent on external factors such as climate, wetland size and seasonality.
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Zhang, Bo, Zhenguo Niu, Dongqi Zhang e Xuanlin Huo. "Dynamic Changes and Driving Forces of Alpine Wetlands on the Qinghai–Tibetan Plateau Based on Long-Term Time Series Satellite Data: A Case Study in the Gansu Maqu Wetlands". Remote Sensing 14, n. 17 (24 agosto 2022): 4147. http://dx.doi.org/10.3390/rs14174147.
Testo completoAbstract (sommario):
The Qinghai–Tibet Plateau (QTP), also known as the Third Pole of the Earth, is sensitive to climate change, and it has become a hotspot area for research. As a typical natural ecosystem on the QTP, alpine wetlands are particularly sensitive to climate change. The identification of different types of alpine wetland and analysis of changes in their distributions and areas are the most direct indicators for characterizing the impact of climate change on wetlands. To understand the dynamic change process of the alpine wetlands in the QTP and their responses to climate change, the Maqu wetlands, located at the source of the Three Rivers in the eastern part of the QTP, was taken as an example; the Google Earth Engine (GEE) remote sensing cloud platform and long-term dense Landsat time series data from 1990 to 2020 were used to map the annual wetland classification and to analyze the evolution characteristics of the wetlands and their driving forces. The results revealed that (1) based on dense Landsat time series data, different alpine wetland types can be effectively distinguished, including swamp, swamp meadow, and wet meadow. (2) From 1990 to 2020, the area of the Maqu wetlands exhibited an overall fluctuating decrease, with the total area decreasing by about 23.35%, among which the swamp area decreased the most (by 27.15%). The overall type of change was from wet to dry. All of the types of wetlands were concentrated between 3400 and 3600 m above sea level, and the reduction in the wetland area was concentrated on slopes < 3°, with the greatest loss of wetland area occurring on shady slopes. (3) The driving forces of the changes in the wetlands were predominantly temperature and precipitation, and the greatest correlation was between the total wetland area and the growing season temperature. The results of this study provide valuable information for the conservation of alpine wetlands.
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Serasinghe, Prasad. "Willingness to pay for conservation of wetland ecosystem: Case of Mudun Ela and Kalu Oya Watersheds of Western Province, Sri Lanka". Nepal Journal of Environmental Science 6 (31 dicembre 2018): 39–45. http://dx.doi.org/10.3126/njes.v6i0.30125.
Testo completoAbstract (sommario):
The wetland ecosystem provides a number of social and economic benefits for people. This importance is often neglected or undervalued and therefore wetlands are in a serious risk today. Specially, in relation to human activities and unwise utilization, wetlands around the globe are being modified, reclaimed and over-exploited due to high levels of resource consumption, land conversion and also upstream developments that alter the quality and flow of water that feeds into wetlands. Decision makers often have a little understanding of the environmental value of wetlands because wetlands are often perceived as having little or no value compared with uses that yield more visible and immediate economic benefits. In this circumstance, revelation and recognition of value of wetlands has been an essential issue which helps to protect such habitats and also it is useful to utilize the benefits of wetlands with a proper management. The present study was carried out with the aim of estimating the willingness to pay (WTP) for conservation of Mudun Ela and Kalu Oya watersheds, Western Province of Sri Lanka using Contingent Valuation Method (CVM). Respondents were randomly selected for data collection through face-to-face interview. The Tobit Model was used to estimate the entrance fee for conservation. The marginal effects on probabilities in the Tobit model suggests that Post-Graduate Degree holders and households who are using wetland as education, research and agricultural purposes play significant roles in the residents’ WTP for conservation of wetland. On the other hand, households who are using wetland for agricultural purposes have negative effects on willingness to pay for wetland conservation practices. Reasons behind is that many of the wetlands that have been managed in the past as paddy lands have been abandoned during the past few decades due to lack of water, low economic returns, water pollutions, lack of interest shown by younger generation for paddy cultivation, etc. Furthermore, use of wetlands for disposal of solid waste has also contributed to degradation of wetlands. Therefore, development of a strategic plan for management of wetlands within the two basins, Mudun Ela and Kalu Oya is a timely intervention that can help manage the remaining wetlands in an efficient manner.
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Folega, Fousséni, Madjouma Kanda, Kossi Fandjinou, Eve Bohnett, Kperkouma Wala, Komlan Batawila e Koffi Akpagana. "Flora and Typology of Wetlands of Haho River Watershed, Togo". Sustainability 15, n. 3 (3 febbraio 2023): 2814. http://dx.doi.org/10.3390/su15032814.
Testo completoAbstract (sommario):
Wetlands are recognized as hotspots of biodiversity and providers of several ecosystem services, including water purification, sediment stabilization, and flood, erosion, and climate regulation. This article aims to investigate the floristic diversity of the wetlands the Haho River watershed in southern Togo. Spatial data from Astrium service and Google Earth were collected, and phytosociological data were classified following the Braun–Blanquet approach. The findings indicate that 72 families in total have evolved in this environment, with Poaceae (14.95%) and Fabaceae (11.98%) dominating. The number of species was estimated to be 323; the three species that were most prevalent in the wetland’s habitats were Elaeis guineensis Jacq (2.44%), Panicum maximum Jacq (2.29%), and Lonchocarpus sericeus (Poir) H. B. K. (1.71%). The most prevalent and abundant life forms in these moist habitats were micro-phanerophytes (34.70%) and therophytes (23.50%). However, the most common and abundant chorological categories included pantropical (31.05%) and Guinean-Congolese species (21.46%). Principal Component Analysis (PCA) was used to examine how abiotic parameters, including depth/degree of immersion, influence the distribution of plant species in a wetland landscape. This research has the potential to be developed into a more robust action study for wetland classification and recognition.
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Maltby, Edward. "The Wetlands Paradigm Shift in Response to Changing Societal Priorities: A Reflective Review". Land 11, n. 9 (9 settembre 2022): 1526. http://dx.doi.org/10.3390/land11091526.
Testo completoAbstract (sommario):
This paper reviews some of the key influences that wetlands have had on the development of human society together with the history of wetland use, conservation and management in the context of changing human interactions from prehistoric to modern times. It documents the origins of the Ramsar Convention and the changes in the criteria for defining wetlands of international importance from an emphasis on migratory birds to those of wider functional importance contributing to community well-being. This led to a significant increase in the number of signatories from developing countries The change in scientific emphasis from ecology to ecosystems (and ecosystem services) is identified as a key element of the wetland paradigm shift, which has occurred in the last half century and renewed the recognition of the importance of the natural capital of wetlands. It represents a change in research agenda from what wetlands are to what wetlands do. Modification of the Ramsar wise use concept is documented, and evolution of wetland assessment methods is traced in relation to policy development and the need for a strong science evidence base to improve decision-making connected with wetland conservation and management. The author also addresses the significance of wetland economic valuation and biodiversity issues, transboundary water management with particular reference to the marshlands of Mesopotamia (southern Iraq), conflict, and human livelihood issues. Examples are given of the drive towards wetland restoration in different countries, and at different scales, with awareness of the extraordinarily high costs associated with major schemes such as the Florida Everglades which may prohibit replication in other parts of the world. Adoption of the Ecosystem Approach and the “Wholescapes” concept are seen as important in the future management of wetland ecosystems. The wide-ranging interactions within the structure of a new wetland paradigm are summarized diagrammatically. An examination of current societal priorities and challenges resulting from the nexus of issues arising from food production, energy, water, and environmental change and health suggests both significant threats to wetlands, but also some opportunities for these ecosystems to play a part in sustainable solutions contributing to human well-being. The paper concludes with an endorsement of a new World Charter for wetlands but emphasizes the vital importance of partnership working and the key engagement of local communities to make any new initiative for enhanced protection and management of wetlands to work on the ground. Key challenges facing wetland science are identified, but it is the realization that healthy wetland ecosystems are a significant contributor to human and societal well-being that underpins the paradigm shift in research, management and policy needs.
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Greenway, Margaret, e John S. Simpson. "Artificial wetlands for wastewater treatment, water reuse and wildlife in Queensland, Australia". Water Science and Technology 33, n. 10-11 (1 maggio 1996): 221–29. http://dx.doi.org/10.2166/wst.1996.0678.
Testo completoAbstract (sommario):
Queensland, Australia has a subtropical-tropical climate with dry winters and wet monsoonal summers. Arid climatic conditions prevail inland with hot dry days and cold nights. The climatic conditions are conducive to high plant growth rates and hence offer great potential for constructed wetlands for water pollution control. The water (a scarce resource during the dry season and in arid regions) can also be used to irrigate crops, playing fields, parks and gardens or golf courses. The water discharged from the wetlands is also of an acceptable quality to flow into estuarine and riverine environments. Many natural wetlands are only seasonally inundated and during the dry season wildlife has to seek alternative refuges. Artificial wetlands receiving sewage effluent provide permanent wildlife habitats and improve the landscape amenity. The Queensland government's Department of Primary Industries has initiated an Artificial Wetlands for Water Pollution Research Program. Under this scheme 10 experimental pilot artificial wetlands have been established and a further 6 university research projects are being conducted on various aspects of artificial wetlands including nutrient and heavy metal uptake and bioavailability in wetland plants, sediment biogeochemistry and mass balances. One gold mine rehabilitation project has an artificial wetland to treat mine leachate. This paper presents 3 case studies which include significant results with respect to wastewater polishing and re-use.
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Quanrud, D. M., M. M. Karpiscak, K. E. Lansey e R. G. Arnold. "Behavior of organic carbon during subsurface wetland treatment in the Sonoran Desert". Water Science and Technology 44, n. 11-12 (1 dicembre 2001): 267–72. http://dx.doi.org/10.2166/wst.2001.0839.
Testo completoAbstract (sommario):
We examined the fate of organics during wetland treatment of secondary effluent and groundwater (control) flows in parallel, research-scale, subsurface-flow (SSF) wetland raceways at the Constructed Ecosystem Research Facility (CERF) located in Tucson, Arizona. The CERF facility enabled us to distinguish experimentally among effects on effluent quality due to season-dependent processes of evapotranspiration (ET) and wetlands-derived production of organics. Organics of wastewater and wetlands origin were compared in terms of their contributions to dissolved organic carbon (DOC) in wetland effluent. Elevated temperatures and associated biochemical activities increased DOC levels in wetland effluents during summer. In other words, DOC removal efficiency was negatively correlated to temperature. The contributions of ET and wetland-derived organics to elevation of DOC in wetland effluents during summer were roughly comparable. The elevation of organic carbon concentration during wetland polishing of wastewater effluent will lead to higher levels of disinfection by-products when treated waters are chlorinated prior to reuse. Results of this work are relevant to water managers in arid regions, which may incorporate wetlands into sequential wastewater treatments leading to potable reuse of reclaimed water.
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Lenders, H. J. R., J. A. M. Garritsen e R. S. E. W. Leuven. "Environmental Quality and Legal Protection of Floodplain Wetlands in the Dutch Part of the Rhine Basin". Water Science and Technology 29, n. 3 (1 febbraio 1994): 293–95. http://dx.doi.org/10.2166/wst.1994.0123.
Testo completoAbstract (sommario):
Large parts of the floodplains in the Dutch Rhine basin can be considered wetlands of international importance. Few data are available concerning the threats to these wetlands. Legal protection and the principle of ' wise use' of the wetlands, as stipulated in the Ramsar Convention, are hardly being implementated in national and local policies. Until 1993 none of the floodplains in the river basin has actually been designated as wetland of international importance. In zoning plans the ' wetland function' is hardly ever recognized as the main function. A relatively small part of the river floodplains is designated as nature reserves or protected areas. More research should be carried out concerning the environmental quality of and ecological standards for wetlands. The physical threats of deterioration, disturbance and fragmentation of habitats deserve special attention. Legal protection and 'wise use' of wetlands in the Rhine basin should be further implemented.
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Ma, Chun, Guang Yu Zhang, Xiao Chun Zhang, Bin Zhou e Wen Xin Jiang. "Water Resource Management for Wetland Restoration Engineering in Tianjin Coastal Area in China". Advanced Materials Research 518-523 (maggio 2012): 4333–36. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.4333.
Testo completoAbstract (sommario):
Wetland is one of the most diverse ecosystem and important habitats. However, degradation and loss of wetlands increased with anthropologic factors. Thus, the research of wetland restoration has become the emphasis and imperative issue. Water plays an important role in ecological evolution of the wetlands, and water requirement is a key step for water resource management of wetland restoration engineering. This research deals with the analysis of water requirement for wetland restoration engineering in a case study in Bohai Bay. The results show that the total water requirement in the study area are (0.18~0.28)×109m3, (0.54~0.81)×109m3, (1.21~1.41)×109m3 to reach the basic objective, moderate objective and perfect objective, respectively.