Artykuły w czasopismach na temat „Lake restoration”
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Wen, Chao, Qingming Zhan, De Zhan, Huang Zhao i Chen Yang. "Spatiotemporal Evolution of Lakes under Rapid Urbanization: A Case Study in Wuhan, China". Water 13, nr 9 (23.04.2021): 1171. http://dx.doi.org/10.3390/w13091171.
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The impact of urbanization on lakes in the urban context has aroused continuous attention from the public. However, the long-term evolution of lakes in a certain megacity and the heterogeneity of the spatial relationship between related influencing factors and lake changes are rarely discussed. The evolution of 58 lakes in Wuhan, China from 1990 to 2019 was analyzed from three aspects of lake area, lake landscape, and lakefront ecology, respectively. The Multi-Scale Geographic Weighted Regression model (MGWR) was then used to analyze the impact of related influencing factors on lake area change. The investigation found that the total area of 58 lakes decreased by 15.3%. A worsening trend was found regarding lake landscape with the five landscape indexes of lakes dropping; in contrast, lakefront ecology saw a gradual recovery with variations in the remote sensing ecological index (RSEI) in the lakefront area. The MGWR regression results showed that, on the whole, the increase in Gross Domestic Product (GDP), RSEI in the lakefront area, precipitation, and humidity contributed to lake restoration. The growth of population and the proportion of impervious surface (IS) in the lakefront area had different effects on different lakes. Specifically, the increase in GDP and population in all downtown districts and two suburb districts promoted lake restoration (e.g., Wu Lake), while the increase in population in Jiangxia led to lake loss. The growth of RSEI in lakefront area promoted the restoration of most lakes. A higher proportion of IS in lakefront area normally resulted in more lake loss. However, in some cases, the growth of IS was caused by lake conservation, which contributed to lake restoration (e.g., Tangxun Lake). The study reveals the spatiotemporal evolution of multiple lakes in Wuhan and provides a useful reference for the government to formulate differentiated protection policies.
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Hu, Shenghua, Xiaofei Chen, Xiaolong Huang i Chenxi Wu. "Submerged Macrophyte Restoration in Enclosure: A Proper Way for Ecological Remediation of Shallow Lakes?" Water 15, nr 7 (27.03.2023): 1317. http://dx.doi.org/10.3390/w15071317.
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Degradation of lake ecosystem is a common problem existing in many countries. Remediation of degraded lake is urgently needed in order to maintain water safety and lake ecosystem health. Restoration of submerged macrophyte is considered as an important measure of ecological remediation of shallow lakes after pollution loading get effectively controlled. Nowadays, enclosures resembling those used in aquaculture historically are widely used for submerged macrophyte restoration. Although submerged macrophyte can be successfully restored in enclosure, it’s contribution to the whole lake ecological remediation is limited. Fish manipulation, which reduces fish stock and adjusts fish community structure, was found able to improve water quality and promote submerged macrophyte restoration in many lakes. However, the role of fish in ecological restoration do not receive enough attention in many ecological remediation projects. Future studies are required to better understand the role of fish in lake nutrient cycle and the influence on submerged macrophyte to help develop theory that better guide the fish manipulation for the ecological remediation in shallow lakes. In the end, we want to point out that manipulation of fish community structure following by natural restoration and/or artificial planting of submerged macrophyte could be an effective strategy for whole lake ecological remediation of shallow lakes, and suggest that fish manipulation measure should be tested in more ecological remediation projects of shallow lakes worldwide.
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van Duin, E. H. S., L. J. Frinking, F. H. van Schaik i P. C. M. Boers. "First results of the restoration of Lake Geerplas". Water Science and Technology 37, nr 3 (1.02.1998): 185–92. http://dx.doi.org/10.2166/wst.1998.0204.
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In 1986 lake restoration was started in the Langeraar lakes, three small connected lakes in the western part of The Netherlands. In one of the lakes, Lake Geerplas, both the internal and external phosphorus load to the lake was reduced. Water quality parameters have been monitored six years after the measures were taken, in both Lake Geerplas and in one of the other Langeraar lakes. Water quality improved in Lake Geerplas during four years, indicated by decreased phosphorus concentrations and turbidity. At the end of the third fourth summer, phosphorus concentrations increased rapidly, presumably due to excessive phosphorus release from the lake sediment. Phytoplankton biomass and phytoplankton composition changed as well. In the sixth year phosphorus concentrations decreased slowly without any additional measures taken. Chlorophyll-a concentrations and turbidity are at the same level now as shortly after the measures were taken. At this moment, the effects of the measures are evaluated and additional measures are considered. Though the changes in water quality variables during the years are clearly related, the driving forces are not yet identified.
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Tay, Chai Jian, Su Yean Teh i Hock Lye Koh. "Eutrophication Bifurcation Analysis for Tasik Harapan Restoration". International Journal of Environmental Science and Development 11, nr 8 (2020): 407–13. http://dx.doi.org/10.18178/ijesd.2020.11.8.1282.
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Regime shift is characterized by large, abrupt and persistent changes in ecosystem structure and dynamics. Bifurcation analysis is commonly used to identify regime shift equilibrium states and to distinguish their stability characteristics. Eutrophication in lake, a regime shift from clear-water oligotrophic state, is a stable equilibrium state that can persist for long duration. Characterized by undesirable turbid water condition, eutrophication has been known to impair valuable ecosystem services provided by lakes worldwide. The high incidence of eutrophication in Malaysian lakes (62%) mandates urgent need for lake restoration. The three-fold objectives of this paper are (1) to develop a mathematical model for analysing bifurcation criteria in regime shift, (2) to identify regime shift thresholds and (3) to propose effective ecosystem management strategy for shallow tropical lakes such as Tasik Harapan. A mathematical model consisting of four compartments: algae, phosphorus, dissolved oxygen and biochemical oxygen demand is formulated to analyse the eutrophication dynamics in the highly eutrophic Tasik Harapan (TH), a small shallow lake in Universiti Sains Malaysia (USM). Bifurcation analysis is performed by means of XPPAUT to identify the regime shift thresholds and to determine the type of lake response. Identified as irreversible, the eutrophication state of TH mandates an urgent lake restoration program to remove nutrients in the lake. Two restoration methods for reducing nutrients are assessed: (1) flushing of lake water and (2) hypothetical application of the invasive water hyacinth. Bifurcation analysis indicates that a flushing rate exceeding 0.042 day-1 is needed to restore TH to oligotrophic state. A complicated strategy of water hyacinth application would reduce the algae concentration from 300 μg/l to 120 μg/l after 9.6 years. A severe shortfall is the complicated and uncertain process of frequent removal of water hyacinth to prevent the lake from being overwhelmed by the invasive plants. The feasibility and sustainability of these two lake restoration methods are discussed. The insights gained would be useful to the relevant authorities in determining and implementing the best remediation measures for TH.
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Budzynski, Joan B., i Nabil A. Muhaisen. "Lake Apopka Restoration". Proceedings of the Water Environment Federation 2004, nr 9 (1.01.2004): 1–9. http://dx.doi.org/10.2175/193864704784132418.
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Mostafa, H., S. Attia i Z. Feisal. "A strategy for Lakes ecological restoration by integrated constructed wetlands, Case study: lake Qaroun, Egypt". IOP Conference Series: Earth and Environmental Science 1113, nr 1 (1.12.2022): 012008. http://dx.doi.org/10.1088/1755-1315/1113/1/012008.
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Abstract Wetlands have a significant impact on healing degraded ecosystems and restoring environmental balance for their broad range of benefits. Lakes are considered a type of wetlands combining terrestrial and aquatic ecosystems, it is important to restore lakes wetlands to regain the ecological services provided by these systems, which might have been severely altered from human pressure, pollution and urban development. This paper investigates the concept of ecological restoration of Lake Qaroun wetlands proposing an ecological restoration strategy to enhance the current situation of site by using integrated constructed wetlands. The research conducts a literature review of wetlands restoration concept and the values of integrated constructed wetland as a restoration approach, besides showcasing several case studies of lake restoration plans than choosing two similar case studies with same the environmental challenges to determine the efficiency range of their restoration plans and their physical impact on site. Lake Qaroun previous development plans and the current situation were reviewed to determine the factors of success or failure. The proposed strategy of ecological restoration using integrated constructed wetlands combines an extensive management /monitoring program supported by governance inclusion and public participation, to be further implemented to achieve a better impact and a successful restoration process.
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Kudelska, Danuta. "Approaches to Urban Lakes Assessment and Restoration in Poland". Water Quality Research Journal 27, nr 2 (1.05.1992): 287–300. http://dx.doi.org/10.2166/wqrj.1992.020.
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Abstract Research conducted on urban lakes in Poland has proven the degradation of the quality and utility of their waters. This is caused by the contamination of these lakes with sewage and wastewater from adjacent towns, urban run-off and excessive recreation. The most effective external source controls are rarely implemented due to high costs. However, in-lake activities are being conducted with application of different techniques. The removal of nutrient-rich hypolimnetic water by pipeline was the first restoration experiment designed and performed in Kortowskie Lake by Prof. Olszewski in the mid-sixties. It proved to be effective in retarding the process of lake degradation. Recently, aeration devices such as Ecoflox, Miniflox and Microflox have been installed in several urban lakes in order to improve its water quality. New devices, such as bio-hydro structures designed in Poland and installed in several water bodies, have given promising effects in water quality improvement. The long range assessment of restoration techniques and monitoring of lake water quality is conducted and supervised by the Institute of Environmental Protection.
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Derevenskaya, O. Y. "Changes in zooplankton communities of the Lebyazhye system restored lakes". IOP Conference Series: Earth and Environmental Science 937, nr 2 (1.12.2021): 022069. http://dx.doi.org/10.1088/1755-1315/937/2/022069.
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Abstract Ponds rehabilitation projects for the purpose of eco - rehabilitation following significant anthropogenic impacts or degradation are becoming more frequent but not always successful. Therefore, the experience of the restoration of the Lebyazhye system lakes in Kazan city (Russia) is interesting. Previously, the lake system used to consist of four ponds, but due to water catchment area reduction, the area of the lake system also decreased, and only one lake remained. The restoration of the Lebyazhye system lakes was carried out in 2017 and included the deepening of the basin of the Bolshoe and Svetloe Lebyazhye lakes to 4 m, the sealing of the bed of future ponds with bentonite mats, supplying water from Izumrudnoye lake through a pressure water conduit and filling the basin of the lakes with water. The research is devoted to the study of the restoration of zooplankton communities in the Lebyazhye system lakes. For this purpose, the indicators of zooplankton communities before and after eco-rehabilitation measures were compared. After the implementation of eco-rehabilitation measures, significant changes in environmental parameters were observed: the salinity of water decreased, the oxygen content in the water, pH increased. In zooplankton communities, the species richness and diversity increased, new species appeared, as well as those that lived in the lake system earlier before eco-rehabilitation measures were taken.
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Azeem, Muhammad, Junaid Alam Memon i Fateh Muhammad Mari. "Manchar Lake’s Hypothetical Restoration and Willingness of Fishing Communities to Switch Back To Fishing". January 2021 40, nr 1 (1.01.2021): 53–65. http://dx.doi.org/10.22581/muet1982.2101.05.
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Environmental and anthropogenic changes in lakes have implications for fishers’ livelihoods in form of their forced migration and occupational change. Those advocating lake restorations often face a dilemma whenasked if lake restoration will also restore the lost livelihoods. Answering such questions are difficult because most people are not programmed for frequent changes in their livelihood structures. Using the case study of Manchar Lake fishers who seemingly have faced such transition, this study brings insights on this broad question. We developed an in-person survey based on Contingent Valuation Method (CVM) to study 300 fishers’ responses to a hypothetical situation whereby they were asked to “Switch Back” to Manchar Lake assuming that it has been restored to provide various ecosystem services. Results show that complete transformation in the livelihoods of fishing communities has taken place with remarkable variation in their access to assets and livelihood outcomes. Despite increase in their access to physical capital such as school, hospital, roads, and markets, the communities are still vulnerable to income shocks and rarely enjoy privileges such as house ownership. The comparative state of current and past livelihoods and asset possessions determine ones’ willingness to switch back to fishing in Manchar Lake. Those who may have performed better in the said transition are less likely to return to their erstwhile occupations even if the lake is restored and vice-versa. We conclude that satisfaction with current livelihood outcomes is low and willingness to switch back to fishing in Manchar Lake is high since many had been poor performers in the transition. While the environmental rationale for the Manchar Lake’s ecological restoration already exists, this study suggests that there also exists a socioeconomic rationale albeit in a way that restoration also supports contemporary ecological services such as tourism.
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Sellergren, Maja, Jing Li, Stina Drakare i Sebastian Thöns. "Decision Support for Lake Restoration: A Case Study in Swedish Freshwater Bodies". Water 15, nr 4 (8.02.2023): 668. http://dx.doi.org/10.3390/w15040668.
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A considerable number of lakes in Sweden have high phosphorus internal loading from the sediments which cause cyanobacterial blooms every summer. Due to potential risks with such blooms for human health, drinking water supply, and ecosystem services, measures need to be taken to control the phosphorus content. Measures to control the phosphorus input from the surrounding land has been in focus. However, the measures have not been sufficient. This is because phosphorus deposited at the bottom of the lakes for many years are finally starting to leak to the water phase when the decomposition of sediments leads to anoxic conditions. In order to determine effective and efficient lake restoration measures, methods for lake restoration decision support by a multi-criteria analysis and the application of a decision analysis are developed. The multi-criteria analysis includes the determination of costs, longevity, and efficacy of six common lake restoration measures to reduce internal phosphorous loads in two lakes selected as a case study. The results show that aluminum treatment combines a highest efficacy with a high-cost efficiency being thus the optimal identified measure. The method involves adding an aluminum solution to the lakes’ sediment, which binds phosphorus, preventing it to be released to the water column. The multi-criteria model is integrated to a decision analytical model. The decision analytical model is used to identify the monetary socio-economic and environmental boundaries for the implementation of the optimal lake restoration measure.
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Shapiro, Joseph. "Lake restoration by biomanipulation—a personal view". Environmental Reviews 3, nr 1 (1.01.1995): 83–93. http://dx.doi.org/10.1139/a95-003.
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Restoration of over-fertilized, algae-laden lakes and reservoirs has generally been based on removal or reduction of phosphorus inputs and concentrations. However, this approach frequently is not feasible. An alternative is biomanipulation, in which the biota of the water body, particularly the fish population, is manipulated so as to reduce predation on small herbivorous zooplankters. This results in increases in body size of the zooplankters with consequent great increases in grazing rates on the algae. The process, though controversial, has worked in many lakes and offers promise to many more.Key words: biomanipulation, trophic cascade, lake restoration.
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KLAPPER, Helmut. "Technologies for lake restoration". Journal of Limnology 62, nr 1s (1.09.2003): 73. http://dx.doi.org/10.4081/jlimnol.2003.s1.73.
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Gibbons, Harry L., i Stephen C. Wagner. "RESTORATION OF LAKE BALLINGER". Lake and Reservoir Management 2, nr 1 (styczeń 1986): 277–80. http://dx.doi.org/10.1080/07438148609354643.
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Nelson, Ralph D., i David A. Morency. "CAPITOL LAKE RESTORATION PROJECT". Lake and Reservoir Management 2, nr 1 (styczeń 1986): 377–81. http://dx.doi.org/10.1080/07438148609354660.
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Sondergaard, Martin, Erik Jeppesen, Jens Peder Jensen i Torben Lauridsen. "Lake restoration in Denmark". Lakes and Reservoirs: Research and Management 5, nr 3 (15.09.2000): 151–59. http://dx.doi.org/10.1046/j.1440-1770.2000.00110.x.
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Bartodziej, William, i Susan Galatowitsch. "Urban Lake Shoreland Restoration". Ecological Restoration 42, nr 2 (23.05.2024): 87–99. http://dx.doi.org/10.3368/er.42.2.87.
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Boromisza, Zsombor, Tamás Ács i Éva Pádárné Török. "Integrating applied lake ecology into spatial planning: towards a socially acceptable lakeshore restoration at Lake Velence (Hungary)". Landscape & Environment 9, nr 1 (6.07.2015): 27–41. http://dx.doi.org/10.21120/le/9/1/3.
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A good chance of a socially accepted shore-restoration that is sustainable for the long run stands only, if all those, concerned in lake-use, are also interested in the ecological interventions, if shore-restoration serves social and economic purposes, as well. In the previous phase of our research, assessments were made to find the sections of the shore zone that are suitable for restoration: to detect the sites where the existing artificial shoreline stabilization works could be removed. So that social demands should be involved in the assessment process, to begin with, structured interviews were made. According to the results, the share of the plots, being suitable or partially suitable for shore-restoration, slightly exceeded 7%. The analysis of restoration’s limiting factors has shown that the type of shoreline stabilization, the width of zone covered by emergent macrophytes, the extent of human pressures, and the relevant regulations on zoning (fixed in urban plans) together set limits to restoration. The interviews have made it clear that as a result of the changed demands on recreation-tourism, also the natural and landscape values have become more significant
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Sunaryani, A., A. B. Santoso, F. H. Muttaqien, F. Harvianto, H. A. Rustini, N. L. Kartini, D. Nilawati i E. Triwisesa. "A web-based numerical model for sustainable management of Lake Batur, Bali: Preliminary results". IOP Conference Series: Earth and Environmental Science 1201, nr 1 (1.06.2023): 012049. http://dx.doi.org/10.1088/1755-1315/1201/1/012049.
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Abstract Lake Batur is one of The National Priority Lakes according to President Regulation Number 60/2021 with the target of restoring water quality through the pollution control program for floating net fishery (FNF), agriculture, and other anthropogenic sources around the watershed. The regulation also states several internal measures designed to restore the lake’s water quality. Unfortunately, detailed information on pollution control priorities, the amount that must be controlled for water quality improvements to be visible, and the effectiveness of internal restoration efforts have yet to be obtained. This can hinder the lake restoration process and, furthermore, its sustainable management. This study aimed to develop a web-based numerical model as an open-source web-service for guiding restoration in Lake Batur. It is accessible via the interactive graphical user interface (GUI) running in a standard web browser and includes tools of varying complexity. The platform provides the user with features to set up some parameters, run and analyze the numerical water quality, and the possibility to set up, run and compare various lake management scenarios. The preliminary results show that the model was able to represent existing daily water quality dynamics. Hopefully, the model can be used as a tool for lake restoration and as a part of sustainable lake management.
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Su, Wei, Jiapeng Wu, Bei Zhu, Kaiqi Chen, Wenqi Peng i Baoyue Hu. "Health Evaluation and Risk Factor Identification of Urban Lakes—A Case Study of Lianshi Lake". Water 12, nr 5 (17.05.2020): 1428. http://dx.doi.org/10.3390/w12051428.
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Health assessment and risk factor identification represent the premise and foundation of scientific management and ecological restoration of urban lakes. Based on in-depth understanding of the nature–society duality of urban lakes, a framework for evaluating urban lake health was constructed, including four modules, namely, establishing an index system; determining the index weight; identifying risk factors; and a comprehensive lake health evaluation. Employing this framework, we evaluated Lianshi Lake, Beijing, classifying the lake condition as “sub-healthy”. Based on the evaluation data, we identified the health risk factors of the lake. We applied standard difference rate (SDR) and risk degree (Rd) (safe degree (Sd)) concepts, and classified the indices of risk areas employing the Pareto analysis method. Finally, we identified the lake residence period, landscape connectivity, and eutrophication as the major risk factors in Lianshi Lake. Three factors constitute the basis of ecosystem health and are key targets of ecological restoration: the lake residence period represents the hydrological and hydrodynamic characteristics of the lake; landscape connectivity is described from an ecological perspective, and represents the integrity of the lake ecosystem; and the eutrophication states describe the water quality characteristics and represent the availability of lake water. The results contribute to decision-making for comprehensive urban lake management.
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Bozic, M., G. Nikolic, Z. Rudic, V. Raicevic i B. Lalevic. "Constructed wetlands as an alternative restoration measure for shallow lakes". Water Science and Technology 68, nr 7 (1.10.2013): 1672–78. http://dx.doi.org/10.2166/wst.2013.412.
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This paper deals with the consequences of cultural eutrophication and unconventional solutions for shallow lake restoration. Cultural eutrophication is the primary problem that affects especially shallow lakes, due to their physical characteristics (e.g. shallow depth, lack of stratification). Palic Lake, a very shallow Pannonian lake, received treated municipal wastewaters coming from the lagoons of a wastewater treatment plant. The sewage discharge mainly increased the nutrient load to the lake in the last decades. The lake sustainability is affected by inappropriate quality of water that flows into the lake, and abundance of deposited sediment. The technology that can provide both improvement of water quality and resolution of the sediment problem is a constructed wetland, which is designed to utilise the natural processes involving wetland vegetation, soil and their associated microbial assemblages to assist in additional water treatment. The technical solution is based on three key aspects: quality and quantity of deposited sediment, enriched by nutrients; effluent quality; desired lake water quality. A designed constructed wetland can accomplish the desired water quality and gradually remediate deposited sediment.
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Schmidt, Stephanie N., M. Jake Vander Zanden i James F. Kitchell. "Long-term food web change in Lake Superior". Canadian Journal of Fisheries and Aquatic Sciences 66, nr 12 (grudzień 2009): 2118–29. http://dx.doi.org/10.1139/f09-151.
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Restoration and rehabilitation of native species in the Laurentian Great Lakes is a priority for fisheries management agencies. Restoration efforts are increasingly incorporating a perspective that considers species within a broader food web context. We used stable isotope analysis and museum-preserved specimens to describe and quantify 100 years of food web changes in the Lake Superior fish community. We validated stable isotope analysis of museum specimens by showing a positive correlation between isotope- and diet-based estimates of trophic position. While introductions have created a more trophically diverse food web than historically found in Lake Superior, two separate metrics revealed little community-wide change in the food web. Our species-specific analysis revealed trophic niche differences between shortjaw ( Coregonus zenithicus ) and shortnose ( Coregonus reighardi ) ciscoes, two species previously argued to be indistinguishable based on morphological characteristics. By providing a historical context, our findings show the ability of the Lake Superior food web to accommodate non-native species introductions over the last century while still supporting native species populations. This long-term information about food web structure can help guide management and restoration goals in Lake Superior. Furthermore, Lake Superior can serve as a basis for comparing food web changes in other, more highly altered Great Lakes.
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Deng, Shupan, Qiuqin Wu, Zhichao Wang, Longhua Wu, Zhiwen Huang i Guangming Zhang. "Investigating Flood Characteristics and Mitigation Measures in Plain-Type River-Connected Lakes: A Case Study of Poyang Lake". Water 16, nr 2 (12.01.2024): 281. http://dx.doi.org/10.3390/w16020281.
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The flow of plain-type river-connected lakes is affected by both upstream and downstream rivers, and the hydrological conditions are very complex. Poyang Lake, situated in Jiangxi Province, is the largest river-connected lake in the Yangtze River Basin. Its unique geographical features and complex hydrological conditions have made it a heavy disaster area and a frequent area of floods since ancient times. As typical mitigation measures of Poyang Lake, semi-restoration polder areas and flood storage and detention areas play a crucial role in the flood control of Poyang Lake. Taking Poyang Lake as an example, this article studies the flood characteristics of Poyang Lake based on the measured hydrological data. Furthermore, by using the weir (gate) outflow formula to construct the hydraulic model of semi-restoration polder areas and DHI MIKE to construct the hydrodynamic model of Kangshan flood storage and detention area, the flood diversion capacity of the two, and the flood diversion effect under the super-historical flood in 2020 are analyzed. The results show that compared with the non-use of mitigation measures, the maximum cumulative reduction in Xingzi water level can be reduced by 0.68 m and 0.48 m when semi-restoration polder areas and Kangshan flood storage and detention areas are used alone. Finally, the article puts forward some thoughts and suggestions on the flood control of Poyang Lake. The research results can offer some reference to the flood risk management of plain-type river-connected lakes.
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Kowalski, Hubert, Jolanta Katarzyna Grochowska, Michał Łopata, Renata Augustyniak-Tunowska i Renata Tandyrak. "A Unique Application Methodology for the Use of Phosphorus Inactivation Agents and Its Effect on Phosphorus Speciation in Lakes with Contrasting Mixing Regimes". Water 15, nr 1 (25.12.2022): 67. http://dx.doi.org/10.3390/w15010067.
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The efficiencies of the restoration of two lakes of varied morphometries and trophic states—meromictic, hypertrophic Lake Klasztorne Małe, and dimictic, eutrophic Lake Klasztorne Duże—with the use of the phosphorus inactivation method with sequential application of iron and aluminum compounds have been compared. The total dose of the agents applied for Lake Klasztorne Małe was 38 tons of PAX 18 (aluminum polychloride) and 14 tons of PIX 111 (iron chloride), and for Lake Klasztorne Duże, it was 74 tons of PAX 18 and 46 tons of PIX 111. After the application of the compounds, better efficiency of phosphate removal from the surface water layers was obtained in the case of the dimictic, eutrophic Lake Klasztorne Duże. The use of two doses of compounds did not lead to complete precipitation of phosphates from the bottom water layers of either lake. It is noteworthy that in the case of both lakes, inhibition of the internal loading process was observed. The obtained results for the Klasztorne lakes showed that the use of two types of compounds makes it possible to reduce the cost of restoration, and moreover, the dosing of iron salts in the coastal areas of the lakes ensures a higher level of ecological safety.
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Rosenthal, Sadie K., Samantha S. Stevens i David M. Lodge. "Whole-lake effects of invasive crayfish (Orconectes spp.) and the potential for restoration". Canadian Journal of Fisheries and Aquatic Sciences 63, nr 6 (1.06.2006): 1276–85. http://dx.doi.org/10.1139/f06-037.
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Effects of invasive species are often extrapolated to whole systems based on small-scale, short-term, and (or) single-system studies. For example, previous laboratory studies and in-lake cage experiments suggest that invasive crayfish Orconectes rusticus and O. propinquus reduce macrophyte and snail abundance in north temperate lakes, and snapshot lake surveys provide supporting evidence. Still, these impacts have not been demonstrated in multiple whole lakes over time. Thus, in summer of 2003, we resurveyed benthic invertebrates and macrophytes in lakes originally surveyed by the Michigan Department of Natural Resources in the late 1930s. Our multilake survey supports the macrophyte results from small-scale and comparative studies: macrophyte species richness and abundance declined significantly in invaded lakes relative to uninvaded lakes. We next conducted a laboratory seed-bank study to examine the potential for macrophyte restoration in a lake occupied by rusty crayfish for at least 15 years. Only two macrophyte species (Najas flexilis and Chara spp.) germinated from sediments from the invaded lake compared with eight species from reference sediments. This suggests that invaded lakes may have depauperate seed banks and that restoration of invaded macrophyte communities may require manual planting, even if crayfish could be removed.
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Janse, J. H., W. Ligtvoet, S. Van Tol i A. H. M. Bresser. "A Model Study on the Role of Wetland Zones in Lake Eutrophication and Restoration". Scientific World JOURNAL 1 (2001): 605–14. http://dx.doi.org/10.1100/tsw.2001.350.
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Shallow lakes respond in different ways to changes in nutrient loading (nitrogen, phosphorus). These lakes may be in two different states: turbid, dominated by phytoplankton, and clear, dominated by submerged macrophytes. Both states are self-stabilizing; a shift from turbid to clear occurs at much lower nutrient loading than a shift in the opposite direction. These critical loading levels vary among lakes and are dependent on morphological, biological, and lake management factors. This paper focuses on the role of wetland zones. Several processes are important: transport and settling of suspended solids, denitrification, nutrient uptake by marsh vegetation (increasing nutrient retention), and improvement of habitat conditions for predatory fish. A conceptual model of a lake with surrounding reed marsh was made, including these relations. The lake-part of this model consists of an existing lake model named PCLake[1]. The relative area of lake and marsh can be varied. Model calculations revealed that nutrient concentrations are lowered by the presence of a marsh area, and that the critical loading level for a shift to clear water is increased. This happens only if the mixing rate of the lake and marsh water is adequate. In general, the relative marsh area should be quite large in order to have a substantial effect. Export of nutrients can be enhanced by harvesting of reed vegetation. Optimal predatory fish stock contributes to water quality improvement, but only if combined with favourable loading and physical conditions. Within limits, the presence of a wetland zone around lakes may thus increase the ability of lakes to cope with nutrients and enhance restoration. Validation of the conclusions in real lakes is recommended, a task hampered by the fact that, in the Netherlands, many wetland zones have disappeared in the past.
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Holey, Mark E., Ronald W. Rybicki, Gary W. Eck, Edward H. Brown, J. Ellen Marsden, Dennis S. Lavis, Michael L. Toneys, Tom N. Trudeau i Ross M. Horrall. "Progress Toward Lake Trout Restoration in Lake Michigan". Journal of Great Lakes Research 21 (1995): 128–51. http://dx.doi.org/10.1016/s0380-1330(95)71087-5.
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Bronte, Charles R., Mark P. Ebener, Donald R. Schreiner, David S. DeVault, Michael M. Petzold, Douglas A. Jensen, Carl Richards i Steven J. Lozano. "Fish community change in Lake Superior, 1970–2000". Canadian Journal of Fisheries and Aquatic Sciences 60, nr 12 (1.12.2003): 1552–74. http://dx.doi.org/10.1139/f03-136.
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Changes in Lake Superior's fish community are reviewed from 1970 to 2000. Lake trout (Salvelinus namaycush) and lake whitefish (Coregonus clupeaformis) stocks have increased substantially and may be approaching ancestral states. Lake herring (Coregonus artedi) have also recovered, but under sporadic recruitment. Contaminant levels have declined and are in equilibrium with inputs, but toxaphene levels are higher than in all other Great Lakes. Sea lamprey (Petromyzon marinus) control, harvest limits, and stocking fostered recoveries of lake trout and allowed establishment of small nonnative salmonine populations. Natural reproduction supports most salmonine populations, therefore further stocking is not required. Nonnative salmonines will likely remain minor components of the fish community. Forage biomass has shifted from exotic rainbow smelt (Osmerus mordax) to native species, and high predation may prevent their recovery. Introductions of exotics have increased and threaten the recovering fish community. Agencies have little influence on the abundance of forage fish or the major predator, siscowet lake trout, and must now focus on habitat protection and enhancement in nearshore areas and prevent additional species introductions to further restoration. Persistence of Lake Superior's native deepwater species is in contrast to other Great Lakes where restoration will be difficult in the absence of these ecologically important fishes.
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Lyu, Tao, Lirong Song, Qiuwen Chen i Gang Pan. "Lake and River Restoration: Method, Evaluation and Management". Water 12, nr 4 (30.03.2020): 977. http://dx.doi.org/10.3390/w12040977.
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Eutrophication has become one of the major environmental issues of global concern due to the adverse effects on water quality, public health and ecosystem sustainability. Fundamental research on the restoration of eutrophic freshwaters, i.e., lakes and rivers, is crucial to support further evidence-based practical implementations. This Special Issue successfully brings together recent research findings from scientists in this field and assembles contributions on lake and river restoration. The 12 published papers can be classified into, and contribute to, three major aspects of this topic. Firstly, a background investigation into the migration of nutrients, and the characteristics of submerged biota, will guide and assist the understanding of the mechanisms of future restoration. Secondly, various restoration strategies, including control of both external and internal nutrients loading, are studied and evaluated. Thirdly, an evaluation of the field sites after restoration treatment is reported in order to support the selection of appropriate restoration approaches. This paper focuses on the current environmental issues related to lake and river restoration and has conducted a comprehensive bibliometric analysis in order to emphasise the fast-growing attention being paid to the research topic. The research questions and main conclusions from all papers are summarised to focus the attention toward how the presented studies aid gains in scientific knowledge, engineering experience and support for policymakers.
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Janse, Jan H., i Louis van Liere. "PCLAKE: a modelling tool for the evaluation of lake restoration scenarios". Water Science and Technology 31, nr 8 (1.04.1995): 371–74. http://dx.doi.org/10.2166/wst.1995.0332.
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The response of various water quality parameters on nutrient load reduction in shallow lakes is often non-linear, because of the many different ecological interactions involved. In order to get insight into this, a mathematical model is presented combining a description of the internal nutrient cycles with a food-web approach. Different applications of the model are discussed: combined calibration on a multi-lake data set, and a study on the effects of increasing vs. decreasing loading on the water quality in an “average shallow lake”. The model has also been used to evaluate different restoration scenarios in several lakes in The Netherlands.
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Tussupova, Kamshat, Anchita Anchita, Peder Hjorth i Mojtaba Moravej. "Drying Lakes: A Review on the Applied Restoration Strategies and Health Conditions in Contiguous Areas". Water 12, nr 3 (9.03.2020): 749. http://dx.doi.org/10.3390/w12030749.
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Decrease of saline lakes, which comprise 44% of all available lake water, is a major concern. It additionally accelerates the desertification process of the region. Thus, various countries have taken different actions in protecting their lake water levels. The aim of this paper is to assess different strategies directed to tackle the decreased lake water levels in Lake Urmia and the Aral Sea, which split into the North Aral Sea and South Aral Sea. These are among the world’s largest and fastest drying saline lakes observed in the past 50 years and have both reduced to 10% of their original size. The paper presents a thorough review of academic reports, official documents, and databases. Although the dry-up of a lake is a natural process, it has been sped up by human interventions in the hydrological cycle. Dust storms (strong winds) cause problems in the surroundings. In the case of the Aral Sea, they transmit the pollutants from the dry lake bed causing severe health issues. Various strategies were implemented to manage the socio-economic conditions caused due to the drying of lakes. The strategy implemented for the North Aral Sea was to restore the lake by reducing the water withdrawals from the Syr Darya river, which lead to increased water inflow to the sea. The suggested strategy for Lake Urmia was to restore the lake by water transfer activities from various water sources. These projects have not yet been realized. The strategy implemented for the South Aral Sea was to use a dry lake bed to diversify the economy by oil and mineral extraction along with developing a tourist industry based on the considerable interest to come and observe an ecological disaster of such monumental proportions. These findings show that there is no common best solution for this type of problem. The best fit depends on the local context and it is strongly path-dependent.
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Gewin, Virginia. "Hurricanes Hamper Lake Okeechobee Restoration". Frontiers in Ecology and the Environment 3, nr 5 (czerwiec 2005): 237. http://dx.doi.org/10.2307/3868476.
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Hamilton, David P., Kevin J. Collier i Clive Howard-Williams. "Lake Restoration in New Zealand". Ecological Management & Restoration 17, nr 3 (wrzesień 2016): 191–99. http://dx.doi.org/10.1111/emr.12226.
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Sebetich, Michael J., i Nicholas Ferriero. "Lake restoration by sediment dredging". SIL Proceedings, 1922-2010 26, nr 2 (grudzień 1997): 776–81. http://dx.doi.org/10.1080/03680770.1995.11900822.
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Salminen, Sarianna, Mira Tammelin, Tom Jilbert, Yu Fukumoto i Saija Saarni. "Human actions were responsible for both initiation and termination of varve preservation in Lake Vesijärvi, southern Finland". Journal of Paleolimnology 66, nr 3 (28.05.2021): 207–27. http://dx.doi.org/10.1007/s10933-021-00200-1.
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AbstractThe influence of lake restoration efforts on lake bottom-water conditions and varve preservation is not well known. We studied varved sediments deposited during the last 80 years along a water-depth transect in the Enonsaari Deep, a deep-water area of the southernmost Enonselkä Basin, Lake Vesijärvi, southern Finland. For the last few decades, the Enonselkä Basin has been subject to ongoing restoration efforts. Varve, elemental, and diatom analyses were undertaken to explore how these actions and other human activities affected varve preservation in the Enonsaari Deep. In contrast to most varved Finnish lakes, whose water columns have a natural tendency to stratify, and possess varve records that span thousands of years, varve formation and preservation in Lake Vesijärvi was triggered by relatively recent anthropogenic stressors. The multi-core varve analysis revealed that sediment in the Enonsaari Deep was initially non-varved, but became fully varved in the late 1930s, a time of increasing anthropogenic influence on the lake. The largest spatial extent of varves occurred in the 1970s, which was followed by a period of less distinguishable varves, which coincided with diversion of sewage from the lake. Varve preservation weakened during subsequent decades and was terminated completely by lake aeration in the 2010s. Despite improvements in water quality, hypolimnetic oxygen depletion and varve preservation persisted beyond the reduction in sewage loading, initial aeration, and biomanipulation. These restoration efforts, however, along with other human actions such as harbor construction and dredging, did influence varve characteristics. Varves were also influenced by diatom responses to anthropogenic forcing, because diatoms form a substantial part of the varve structure. Of all the restoration efforts, a second episode of aeration seems to have had the single most dramatic impact on profundal conditions in the basin, resulting in replacement of a sediment accumulation zone by a transport or erosional zone in the Enonsaari Deep. We conclude that human activities in a lake and its catchment can alter lake hypolimnetic conditions, leading to shifts in lake bottom dynamics and changes in varve preservation.
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Xin, Tong. "Enlightenment of Everglade Wetland Restoration in Florida, USA to Chinese Dongting Lake Restoration". Advanced Materials Research 955-959 (czerwiec 2014): 2139–44. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2139.
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Under the guidance of the Comprehensive Everglades Restoration Plan (CERP), this paper introduces successful experience of the Everglade wetland restoration in Florida including the ideas, the methods and the measures, in order to provide some enlightenment for the wetland ecosystems restoration and protection in Dongting Lake. Then this article analyzes the pollution characteristics and treatment status of Dongting Lake, and points out the main problems of restoration construction. Taken the development of Dongting Lake into consideration, some suggestion is provided: set definite aim and planning; strengthen multilateral cooperation and investment in science and technology; pay attention to public participation and the human-water harmony.
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Lürling, Miquel, Maíra Mucci i Guido Waajen. "Removal of Positively Buoyant Planktothrix rubescens in Lake Restoration". Toxins 12, nr 11 (5.11.2020): 700. http://dx.doi.org/10.3390/toxins12110700.
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The combination of a low-dose coagulant (polyaluminium chloride—‘Floc’) and a ballast able to bind phosphate (lanthanum modified bentonite, LMB—‘Sink/Lock’) have been used successfully to manage cyanobacterial blooms and eutrophication. In a recent ‘Floc and Lock’ intervention in Lake de Kuil (the Netherlands), cyanobacterial chlorophyll-a was reduced by 90% but, surprisingly, after one week elevated cyanobacterial concentrations were observed again that faded away during following weeks. Hence, to better understand why and how to avoid an increase in cyanobacterial concentration, experiments with collected cyanobacteria from Lakes De Kuil and Rauwbraken were performed. We showed that the Planktothrix rubescens from Lake de Kuil could initially be precipitated using a coagulant and ballast but, after one day, most of the filaments resurfaced again, even using a higher ballast dose. By contrast, the P. rubescens from Lake Rauwbraken remained precipitated after the Floc and Sink/Lock treatment. We highlight the need to test selected measures for each lake as the same technique with similar species (P. rubescens) yielded different results. Moreover, we show that damaging the cells first with hydrogen peroxide before adding the coagulant and ballast (a ‘Kill, Floc and Lock/Sink’ approach) could be promising to keep P. rubescens precipitated.
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Augustyniak, Renata, Renata Tandyrak, Michał Łopata i Jolanta Grochowska. "Long Term Sediment Modification Effects after Applications of P Inactivation Method in Meromictic Lake (Starodworskie Lake, Olsztyn Lakeland, Poland)". Land 10, nr 4 (13.04.2021): 411. http://dx.doi.org/10.3390/land10040411.
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Lake restoration is a part of geoengineering, which is a useful tool for landscape management. The phosphorus inactivation method is one of the most popular lake restoration methods. Using chemical compounds for P binding is leading to the creation of sediment “active layer”, which should show higher P adsorption abilities, compared to non-modified sediment. Howewer, it provides rather little information, how long the modified sediment remains active, and whether it is effective in continuous P binding. Lake meromixis is not commonly observed phenomenon, and sediment located in monimolimnion area is subjected long term anoxia. Therefore, observation of “active layer” in a meromictic lake can give very important data about durability of restoration effects. The object of our study was meromictic Starodworskie Lake (5.57 ha, max. depth 24.5 m), located in Olsztyn Lakeland, Poland. In the past the analyzed lake was subjected to various restoration methods, and phosphorus inactivation method by alum use (1994–1995) was the last used treatment type. The mixing regime of this lake had changed from bradimictic (before and during restoration time) into durable meromictic (post-restoration period). The research made two decades after implementing of P inactivation showed the presence of “active” sediment layer 10–15 cm below sediment surface. This sediment layer showed much higher content of P bound to aluminum, compared to surficial sediment layer. P binding molar ratio was assessed and amounted to 16.1 straightly after restoration and 6.1 after 21 years. This fraction amounts were higher that the values noted before restoration (ca. 358% higher than in 1994) and during restoration (ca. 86% higher than in 1995), which was probably the effect of continuous phosphorus adsorption by “active layer” in post-restoration period.
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Hu, Wen, Weiwei Wei, Chun Ye, Chunhua Li, Ye Zheng, Xiaogang Shi, Manqi Chang i Hongsen Chen. "Determining the Optimal Biomass of Macrophytes during the Ecological Restoration Process of Eutrophic Shallow Lakes". Water 13, nr 21 (8.11.2021): 3142. http://dx.doi.org/10.3390/w13213142.
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Many studies have shown that macrophytes play a significant role in controlling eutrophication; however, only a few of these are based on macrophyte biomass. Based on the growth characteristic of macrophytes, we propose an approach for the assessment of the optimal biomass of macrophytes in the decay and growth periods in Lake Datong (a shallow lake), using a lake ecological model. The results showed that the pollution load of the lake should be reduced by 50% while conforming to the Environmental Quality Standards for Surface Water (EQSSW) Class Ⅲ. In contrast, with an increase in the pollution load of 5%, the results indicate that the lake may deteriorate to a turbid state over the next few years. The macrophyte biomass should be harvested during the decay period, when 80% biomass is beneficial to the water quality of the eutrophic shallow lake. Based on macrophyte simulation from 2020–2024, the wet biomass of macrophytes should be controlled at 5.5 kg/m2. The current macrophyte biomass in Lake Datong is four-fold higher than the simulated optimal biomass. This study provides a reference for the adequate ecological restoration of the lake and its subsequent maintenance, as well as scientific support for improving the comprehensive evaluation standard of healthy lakes and the theoretical basis of lake ecological restoration.
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Zhu, Konghao, Yao Wu, Chunhua Li, Jun Xu i Min Zhang. "Ecosystem-Based Restoration to Mitigate Eutrophication: A Case Study in a Shallow Lake". Water 12, nr 8 (29.07.2020): 2141. http://dx.doi.org/10.3390/w12082141.
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Under the influence of human activities, eutrophication has become an increasingly serious global phenomenon, especially in shallow lakes. Many studies have shown that aquatic macrophytes play a significant role in controlling eutrophication, but only few of these studies are ecosystem based. In this paper, we applied a mass-balance ecosystem model to a shallow eutrophic lake (Lake Datong, China) as a case study with the aims of evaluating the status of ecosystem restoration via the recovery of aquatic vegetation and providing adaptive management suggestions. Results showed that the ecosystem was immature with weak energy flows and nutrient cycling largely due to the excessive submerged macrophytes and the lack of fish as consumer. In the early stages of restoration, the number of fish should be reduced, and aquatic vegetation needs to be recovered to mitigate eutrophication. When the aquatic vegetation community tends to be stable, herbivorous and omnivorous fish should be moderately stocked, and dead aquatic macrophytes should be harvested to maintain the healthy and sustainable development of the ecosystem. This study provided insights for the ecological restoration of shallow eutrophic lakes and revealed the urgent need for ecosystem-based restoration.
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Piasecki, Adam, i Włodzimierz Marszelewski. "Dynamics and consequences of water level fluctuations of selected lakes in the catchment of the Ostrowo-Gopło Channel". Limnological Review 14, nr 4 (1.12.2014): 187–94. http://dx.doi.org/10.1515/limre-2015-0009.
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Abstract The article discusses water level fluctuations in lakes and the associated changes in the lake surface and water resources in the years 1992-2011. On the basis of detailed field studies carried out in the hydrological year 2011, short-term and dynamic changes in the lakes’ hydrology were determined. Changes in hydrological lake types were evoked by unexpected hydro-meteorological situations, in particular high precipitation totals and sudden thaws in winter. The main symptom of the lake type change was the restoration, after nearly 10 years, of channels connecting the lakes. In addition, a strong interdependence was recorded in the difference between evaporation and precipitation, as well as the mean annual ranges of lake water levels in the years 1992-2010
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Dai, Tingting, Rui Liu, Xingxing Zhou, Jing Zhang, Mengting Song, Ping Zou, Xiaoyi Bi i Shuibing Li. "Role of Lake Aquatic–Terrestrial Ecotones in the Ecological Restoration of Eutrophic Water Bodies". Toxics 11, nr 7 (26.06.2023): 560. http://dx.doi.org/10.3390/toxics11070560.
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Freshwater lake eutrophication is a global concern causing adverse effects on aquatic ecosystems. The degradation of lake aquatic–terrestrial ecotones, which are the transitional zones between terrestrial and water ecosystems, contributes to eutrophication. These ecotones play vital roles in nutrient cycling, runoff control, biodiversity conservation, and habitat provision. In the past three decades, the research on lake aquatic–terrestrial ecotones has focused on techniques for managing contaminants and runoff purification. This paper reviews the recent studies on the restoration ability of eutrophic water bodies in lake aquatic–terrestrial ecotones in recent years regarding three aspects: the establishment, restoration mechanism, and improvement of restoration function. In addition, ecological factors such as lakeshore height, water level, surface runoff, shallow groundwater level, and rainfall intensity have impacts on the restoration capacity of lake aquatic–terrestrial ecotones.
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Lange, Robert E., i Philip A. Smith. "Lake Ontario Fishery Management: The Lake Trout Restoration Issue". Journal of Great Lakes Research 21 (1995): 470–76. http://dx.doi.org/10.1016/s0380-1330(95)71118-2.
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Reid, David M., David M. Anderson i Bryan A. Henderson. "Restoration of Lake Trout in Parry Sound, Lake Huron". North American Journal of Fisheries Management 21, nr 1 (luty 2001): 156–69. http://dx.doi.org/10.1577/1548-8675(2001)021<0156:roltip>2.0.co;2.
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Söderholm, Svante, i Kjell Eriksson. "Inventering av häckande simänder vid Angarnsjöängen 1978–1998 och sjörestaureringens inverkan på resultatet". Ornis Svecica 9, nr 4 (1.10.1999): 187–200. http://dx.doi.org/10.34080/os.v9.22899.
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Angarnsjöängen is a shallow lake 25 km north-east of Stockholm. It was famous for its bird life already in the 1930s, but the conditions have deteriorated in recent years because of expansion of high emergent vegetation and willows along the shores. A restoration plan was implemented in 1992 involving creation of large areas of open water and increase of the annual water level amplitude, especially spring flooding. The breeding dabbling ducks (Anas species) had been censused annually since 1978. Hence the effects of the restoration could be accurately estimated. After restoration there was a rapid increase of the duck population. Two species, A. querquedula and A. crecca showed the strongest response. Three other species also increased, A. strepera, A. platyrhynchos and A. clypeata, although it was less clear that the restoration was the only cause. For A. strepera the lake also became an excellent autumn site. The study shows that long-term monitoring of important bird lakes is necessary both for detection of deterioration and for assessment of restoration results.
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Wang, Yanping, Weiping Hu, Zhaoliang Peng, Ye Zeng i Karsten Rinke. "Predicting Lake Eutrophication Responses to Multiple Scenarios of Lake Restoration: A Three-Dimensional Modeling Approach". Water 10, nr 8 (27.07.2018): 994. http://dx.doi.org/10.3390/w10080994.
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To improve the water quality and alleviate the eutrophication of Lake Yangchenghu, the third largest freshwater body within the Lake Taihu basin in China and an important source of drinking water, nutrient reduction strategies should be urgently addressed by decision makers, since virtually no improvement of water quality has taken place since the mid-1990s. Due to the lack of sufficient observation data and simulation results, a vertically compressed three-dimensional numerical model, the EcoTaihu model, was used to study the impact of three restoration measures on the water quality—namely, total nitrogen (TN), total phosphorus (TP) and biomass of phytoplankton (BP)—of Lake Yangchenghu: (i) total nutrient reduction, (ii) intensification of flushing by water transfer, and (iii) spatial adjustment of inflow channels. In particular, the spatial effects of the three restoration measures on the water quality were investigated. The results showed that the EcoTaihu model is applicable to other shallow lakes in China. The water quality responses to the different restoration scenarios showed significant spatio-temporal differences. The reduction of nutrient loads from inflows appeared to be the most effective measure for controlling the eutrophication and algal blooms in Lake Yangchenghu. The effectiveness of water transfer on the improvement of water quality for TN and TP was more influenced by the differences of nutrient concentrations between the transferred water and lake water, rather than flow rate, since no proportionate increase of improvement was observable in the case of larger transferred rates (60 m3 s−1). The spatial narrowing of inflowing rivers in the southwestern lake could preferentially improve the water quality in the southern bay of the western lake, but would also result in a deterioration trend of water quality in the total lake and drinking water abstraction areas.
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Xu, Z. H., X. A. Yin i Z. F. Yang. "An optimisation approach for shallow lake restoration through macrophyte management". Hydrology and Earth System Sciences 18, nr 6 (17.06.2014): 2167–76. http://dx.doi.org/10.5194/hess-18-2167-2014.
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Abstract. Lake eutrophication is a serious global environmental issue. Phytoremediation is a promising, cost-effective, and environmentally friendly technology for water quality restoration. However, besides nutrient removal, macrophytes also deeply affect the hydrologic cycle of a lake system through evapotranspiration. Changes in hydrologic cycle caused by macrophytes have a great influence on lake water quality restoration. As a result of the two opposite effects of macrophytes on water quality restoration (i.e. an increase in macrophytes can increase nutrient removal and improve water quality while also increasing evapotranspiration, reducing water volume and consequently decreasing water quality), rational macrophyte control through planting and harvest is very important. In this study, a new approach is proposed to optimise the initial planting area and monthly harvest scheme of macrophytes for water quality restoration. The month-by-month effects of macrophyte management on lake water quality are considered. Baiyangdian Lake serves as a case study, using the common reed. It was found that water quality was closest to Grade III on the Chinese water quality scale when the reed planting area was 123 km2 (40% of the lake surface area) and most reeds would be harvested at the end of June. The optimisation approach proposed in this study will be a useful reference for lake restoration.
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Xu, Z. H., X. A. Yin i Z. F. Yang. "An optimisation approach for shallow lake restoration through macrophyte management". Hydrology and Earth System Sciences Discussions 11, nr 1 (16.01.2014): 807–32. http://dx.doi.org/10.5194/hessd-11-807-2014.
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Abstract. Lake eutrophication is a serious global environmental issue. Phytoremediation is a promising, cost-effective, and environmentally friendly technology for water quality restoration. However, besides nutrient removal, macrophytes also deeply affect the hydrologic cycle of lake system through evapotranspiration. Changes in hydrologic cycle caused by macrophytes have a great influence on lake water quality restoration. As a result of the two opposite effects of macrophytes on water quality restoration (i.e. an increase in macrophytes can increase nutrient removal and improve water quality while also increasing evapotranspiration, reducing water volume and consequently decreasing water quality), rational macrophyte control through planting and harvest is very important. In this study, a new approach is proposed to optimise the initial planting area and monthly harvest scheme of macrophytes for water quality restoration. The month-by-month effects of macrophyte management on lake water quality are considered. Baiyangdian Lake serves as a case study, using the common reed. It was found that water quality was closest to Grade III on the Chinese water quality scale when the reed planting area was 123 km2 (40% of the lake surface area) and most reeds would be harvested at the end of June. The optimisation approach proposed in this study will be a useful reference for lake restoration.
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Li, Bei, Yi-Chi Zhang, Ping Wang, Chao-Yang Du i Jing-Jie Yu. "Estimating Dynamics of Terminal Lakes in the Second Largest Endorheic River Basin of Northwestern China from 2000 to 2017 with Landsat Imagery". Remote Sensing 11, nr 10 (15.05.2019): 1164. http://dx.doi.org/10.3390/rs11101164.
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Quantifying terminal-lake dynamics is crucial for understanding water-ecosystem-economy relationship across endorheic river basins in arid environments. In this study, the spatio-temporal variations in terminal lakes of the lower Heihe River Basin were investigated for the first time since the Ecological Water Diversion Project commenced in 2000. The lake area and corresponding water consumption were determined with 248 Landsat images. Vital recovery of lakes occurred two years after the implementation of the project, and the total lake area increased by 382.6%, from 30.7 to 148.2 km2, during 2002–2017. East Juyan Lake (EJL) was first restored as a project target and subsequently reached a maximum area of 70.1 km2. Water dispersion was initiated in 2003, with the East river prioritized for restoration. Swan Lake in the East river enlarged to 67.7 km2 by 2017, while the other four lakes temporarily existed or maintained an area < 7 km2, such as West Juyan Lake. Water consumed by lakes increased synchronously with lake area. The average water consumption of the six lakes was 1.03 × 108 m3/year, with 63% from EJL. The increasing terminal lakes; however, highlight the seasonal competition for water use between riparian vegetation and lake ecosystems in water-limited areas.
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Lepori, Fabio, Camilla Capelli i Danilo Foresti. "Changes in phytoplankton composition hinder the recovery from eutrophication in a perialpine lake (Lake Lugano, Switzerland and Italy)". Journal of Plankton Research 44, nr 1 (15.12.2021): 22–35. http://dx.doi.org/10.1093/plankt/fbab083.
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Abstract We investigated the factors shaping the response of summer phytoplankton biomass to declining phosphorus (P) concentrations in a lake undergoing restoration (South basin of Lake Lugano, Switzerland and Italy). During 1989–2019, summer P concentrations declined from values typical of eutrophic lakes (>30 μg L−1) to values typical of mesotrophic lakes (10–30 μg L−1). Contrary to expectations, this decline was not followed by a decline in phytoplankton biomass. Instead, phytoplankton biomass showed the highest values in summers with lowest P concentrations. This paradoxical effect was associated with a change in phytoplankton composition. Higher P concentrations were associated with higher relative biomass of green algae, lower P concentrations with higher biomass of cyanobacteria and diatoms. We interpreted this change as a shift from edible and P-demanding phytoplankton to inedible and P-efficient phytoplankton, leading to different trophic structures. The pattern observed may be prompted by the particular conditions of deep lakes approaching mesotrophy, including occurrence of deep-water P reserves and high N concentrations, which can benefit inedible metalimnetic cyanobacteria. To attain reductions in summer phytoplankton biomass, restoration efforts may need to further reduce P concentrations and, possibly, address N enrichment.
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Rosińska, Joanna, Katarzyna Kowalczewska-Madura, Anna Kozak, Wanda Romanowicz-Brzozowska i Ryszard Goldyn. "Were there any changes in zooplankton communities due to the limitation of restoration treatments?" Limnological Review 21, nr 2 (1.06.2021): 91–104. http://dx.doi.org/10.2478/limre-2021-0009.
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Abstract Zooplankton is a good indicator of water quality state. Analysing the species composition and abundance, it is possible to assess the condition of the water body and predict the direction of changes. The aim of the study was to analyse the zooplankton in a shallow urban lake, in which restoration was limited to one method, i.e. wind-aeration. The results were compared with the earlier data obtained during sustainable restoration (three methods: wind-aeration, phosphorus inactivation, biomanipulation) and before the restoration period. The zooplankton was sampled monthly in 2015 and 2016 in the deepest place of the lake from the surface to the bottom. The trophic state was determined based on rotifer trophic state index for lakes (TSIROT). Although the species composition of zooplankton communities varied very little among the restoration periods (Keratella cochlearis f. tecta mainly dominated), significant changes in the abundance of zooplankton were found in the analysed lake. The maximum of total abundance was noted in 2015, almost 5500 ind. L−1, and in the next year its decrease was almost 3-fold, to ca. 1800 ind. L-1. Based on TSIROT, the water was still eutrophic. Leaving only one method of restoration (namely, oxygenation of the bottom waters) proved insufficient to support the development of crucial organisms as cladocerans. The changes in the abundance could have resulted more from seasonal changes than from the effects of aeration. A reduction in species number and maintaining a high proportion of rotifers typical for a high trophic state indicated a return of the ecosystem to its pre-restoration state. High variability in the rotifer abundance indicated a continuous imbalance of the ecosystem. Previous restoration treatments using several methods simultaneously showed better effectiveness. The change of strategy of restoration before obtaining a stable improvement of water quality destroyed previously achieved effects.