Relevant bibliographies by topics / Inland waters

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Inland waters'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 January 2023

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Journal articles on the topic "Inland waters"

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Jozić, Slaven, Vanja Baljak, Arijana Cenov, Dražen Lušić, Dominik Galić, Marin Glad, Daniel Maestro, et al. "Inland and Coastal Bathing Water Quality in the Last Decade (2011–2020): Croatia vs. Region vs. EU." Water 13, no. 17 (September 5, 2021): 2440. http://dx.doi.org/10.3390/w13172440.

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Europe is one of the leading tourist destinations where tourism is one of the key economic sectors. The quality of bathing waters is a very important factor when choosing a vacation destination. Croatia recognized this early and was one of the first Mediterranean countries to start systematic monitoring of bathing waters. On the other hand, monitoring of inland bathing waters is relatively new and includes a much smaller number of sites (41) compared to coastal waters (894). The aim of this paper was to summarize and analyze the water quality of inland and coastal bathing sites of Croatia, closer regions (non-EU Member States) and in the EU for the last decade. The share of excellent water quality in EU Member States increased by 10.1% and 6.6% for inland and coastal waters, respectively (2011–2020). Germany recorded the highest proportion of excellent water quality for inland waters (92.2%) and Cyprus for coastal waters (99.3%). Looking at the 10-year average of the proportion of bathing waters with excellent quality, the proportion of coastal bathing sites exceeds that of inland waters by 7.1%. It is clear that additional efforts should be made to improve the management and monitoring of inland waters.
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Stalcup, Dana, Gary Yoshioka, Ellen Mantus, and Brad Kaiman. "CHARACTERISTICS OF OIL SPILLS: INLAND VERSUS COASTAL." International Oil Spill Conference Proceedings 1997, no. 1 (April 1, 1997): 939–40. http://dx.doi.org/10.7901/2169-3358-1997-1-939.

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ABSTRACT The Emergency Response Notification System database was searched for information on the size of spills, the sources of spills, and the types of oils spilled for both inland and coastal waters. The results of this analysis indicate that the vast majority of spills for both inland and coastal waters are minor discharges, that the sources of the spills differ for inland versus coastal waters, with pipelines representing a minor source for both water systems, and that a wide variety of materials are spilled in both inland and coastal water systems, with crude oil being a more significant contributor for coastal waters.
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Murphy, K. M., and J. J. Symoens. "Vegetation of Inland Waters." Journal of Applied Ecology 28, no. 1 (April 1991): 365. http://dx.doi.org/10.2307/2404144.

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ALLAN, J. DAVID, ROBIN ABELL, ZEB HOGAN, CARMEN REVENGA, BRAD W. TAYLOR, ROBIN L. WELCOMME, and KIRK WINEMILLER. "Overfishing of Inland Waters." BioScience 55, no. 12 (2005): 1041. http://dx.doi.org/10.1641/0006-3568(2005)055[1041:ooiw]2.0.co;2.

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Mouw, Colleen, and Steven Greb. "Inland and coastal waters." Eos, Transactions American Geophysical Union 93, no. 39 (September 25, 2012): 375. http://dx.doi.org/10.1029/2012eo390006.

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Tranvik, Lars J. "Acidification of inland waters." Ambio 50, no. 2 (December 8, 2020): 261–65. http://dx.doi.org/10.1007/s13280-020-01441-6.

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Lestari, Maria Maya. "ARTI PENTING DELIMITASI PERAIRAN PEDALAMAN SETIAP PULAU DI INDONESIA." Jurnal Ilmiah Hukum LEGALITY 25, no. 1 (July 14, 2018): 69. http://dx.doi.org/10.22219/jihl.v25i1.5990.

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Maritime zones of the sovereignty of the Indonesian archipelago can be divided into inland waters, archipelagic waters and territorial sea. But only in the inland waters of Indonesia have absolute sovereignty without any other state right. In order to guarantee and maintain the sovereignty of the country in the inland water zone from overlapping interests and rights of other countries in the zone of Indonesian maritime sovereignty, Indonesia should immediately establish the limits of delimitation of the inland waters and establish legislation to prevent violations of the sovereignty of Indonesia's inland waters territory by the state other. Delimitation of each islands is considered very important in order to maintain the security and defense of the country. The government must immediately establish inland water areas and ports considered strategic and vital to the defense and security of the country. Areas that are considered important this can be closing and banning to enter and / or stopover. So our marine law is firm and we can become a sovereign country in the sea region.
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Wen, Zhidan, Yingxin Shang, Lili Lyu, Sijia Li, Hui Tao, and Kaishan Song. "A Review of Quantifying pCO2 in Inland Waters with a Global Perspective: Challenges and Prospects of Implementing Remote Sensing Technology." Remote Sensing 13, no. 23 (December 3, 2021): 4916. http://dx.doi.org/10.3390/rs13234916.

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The traditional field-based measurements of carbon dioxide (pCO2) for inland waters are a snapshot of the conditions on a particular site, which might not adequately represent the pCO2 variation of the entire lake. However, these field measurements can be used in the pCO2 remote sensing modeling and verification. By focusing on inland waters (including lakes, reservoirs, rivers, and streams), this paper reviews the temporal and spatial variability of pCO2 based on published data. The results indicate the significant daily and seasonal variations in pCO2 in lakes. Rivers and streams contain higher pCO2 than lakes and reservoirs in the same climatic zone, and tropical waters typically exhibit higher pCO2 than temperate, boreal, and arctic waters. Due to the temporal and spatial variations of pCO2, it can differ in different inland water types in the same space-time. The estimation of CO2 fluxes in global inland waters showed large uncertainties with a range of 1.40–3.28 Pg C y−1. This paper also reviews existing remote sensing models/algorithms used for estimating pCO2 in sea and coastal waters and presents some perspectives and challenges of pCO2 estimation in inland waters using remote sensing for future studies. To overcome the uncertainties of pCO2 and CO2 emissions from inland waters at the global scale, more reliable and universal pCO2 remote sensing models/algorithms will be needed for mapping the long-term and large-scale pCO2 variations for inland waters. The development of inverse models based on dissolved biogeochemical processes and the machine learning algorithm based on measurement data might be more applicable over longer periods and across larger spatial scales. In addition, it should be noted that the remote sensing-retrieved pCO2/the CO2 concentration values are the instantaneous values at the satellite transit time. A major technical challenge is in the methodology to transform the retrieved pCO2 values on time scales from instant to days/months, which will need further investigations. Understanding the interrelated control and influence processes closely related to pCO2 in the inland waters (including the biological activities, physical mixing, a thermodynamic process, and the air–water gas exchange) is the key to achieving remote sensing models/algorithms of pCO2 in inland waters. This review should be useful for a general understanding of the role of inland waters in the global carbon cycle.
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Sugahara, Isao. "Sediment Bacteria in Inland Waters." NIPPON SUISAN GAKKAISHI 64, no. 2 (1998): 301–2. http://dx.doi.org/10.2331/suisan.64.301.

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Kaya, Murat, Sibel Yiğit, and Ahmet Altndağ. "Rotifers in Turkish inland waters." Zoology in the Middle East 40, no. 1 (January 2007): 71–76. http://dx.doi.org/10.1080/09397140.2007.10638206.

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Dissertations / Theses on the topic "Inland waters"

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Quibell, G. E. "Remote sensing of algae in inland southern African waters." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005440.

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Routine monitoring of algae in inland waters in southern Africa is a critical element in assessing the efficacy of eutrophication management options. Several authors have indicated that single point samples are not necessarily representative of conditions throughout the water body and some have suggested remote sensing as a means of overcoming this problem. Remote sensing of algae normally involves deriving the empirical relationship between radiance detected at a sensor, and contact sensed chlorophyll concentrations. Quantification of, or compensation for, contributions to the upwelling radiance other than that light reflected by the algae is critical for this approach. In southern Africa these contributions arise primarily from atmospheric effects and from scattering by sediments in the water. A review of the atmospheric correction models suggested that a cosine sun angle correction followed by dark pixel subtraction is the most feasible method to compensate for the former effects. Studies of the changes in upwelling radiance induced by addition of sediment to algal cultures indicated that subtraction of reflectance at ≈665nm from that at ≈700nm, may provide a means of compensating for the scattering by sediments. The disadvantage of this approach is that few sensor systems have narrow spectral bands centred at these wavelengths. Investigations of the nature of the reflectance from 5 algal species indicated that all had similar reflectance spectra, but the blue-green genera had a smaller peak at ≈650nm. Chlorophyll absorption at ≈665nm was evident by lower reflectance at this point, but the alga Microcystis sp. did not conform to the conceptual model of reflectance, in that reflectance at 665nm was higher at increased cell density. Spectra of natural waters confirmed the results obtained in the laboratory. Reflectance at ≈700nm showed the largest changes with increasing chlorophyll concentration and also had the highest correlations to chlorophyll concentrations. However, due to the strong absorption of these wavelengths by water, this reflectance peak only occurred when sufficient cells were found in the upper layers of water. Use of these wavelengths in remote sensing models should therefore be restricted to highly eutrophied waters. Although the reflectance spectra of different algae were similar, the amount of light scattered by each species (measured as turbidity) differed for any given chlorophyll concentration. This appeared to be due to the colonial nature of the cells and means that empirical models will be unique to the species on which they were developed. Comparisons of multispectral photography (MSP) and LANDSAT MSS imagery indicated the MSP data had higher correlations with chlorophyll concentrations than did the MSS data. Chlorophyll simulations from a test set of data using ordinary multiple regression showed that the MSP imagery had mean errors of 7.3M9/I, while that for the MSS imagery was 7.4M9/I. Similar tests using the canonical procedure produced larger mean errors of 9M9/I and 12M9/I for the MSP and MSS data respectively. This was due to the fact that the canonical procedure is not suitable for the spectral band widths of these sensors. In spite of similar simulation accuracies, the MSS imagery produced very patchy synoptic views. This was due to the lower variance (radiometric resolution) in the LANDSAT MSS data. This appears to be the most important criterion for accurate chlorophyll mapping in inland waters. Development of a single multidate algorithm for southern Africa is not yet feasible, and routine monitoring of chlorophyll using these techniques is impractical. However acceptable chlorophyll maps are possible if the model is recalibrated for each occasion and the sensor used has a high radiometric resolution.
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Klaus, Marcus. "Land use effects on greenhouse gas emissions from boreal inland waters." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-134767.

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Anthropogenic activities perturb the global carbon and nitrogen cycle with large implications for the earth’s climate. Land use activities deliver excess carbon and nitrogen to aquatic ecosystems. In the boreal biome, this is mainly due to forestry and atmospheric deposition. Yet, impacts of these anthropogenically mediated inputs of carbon and nitrogen on the processing and emissions of greenhouse gases from recipient streams and lakes are largely unknown. Understanding the ecosystem-scale response of aquatic greenhouse gas cycling to land use activities is critical to better predict anthropogenic effects on the global climate system and design more efficient climate change mitigation measures. This thesis assesses the effects of forest clearcutting and nitrate enrichment on greenhouse gas emissions from boreal inland waters. It also advances methods to quantify sources and sinks of these emissions. Short-term clearcut and nitrate enrichment effects were assessed using two whole-ecosystem experiments, carried out over four years in nine headwater catchments in boreal Sweden. In these experiments, I measured or modeled air-water fluxes of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), combining concentration, ebullition and gas-transfer velocity measurements in groundwater, streams and lakes. By using Swedish national monitoring data, I also assessed broad-scale effects of forest clearcutting by relating CO2 concentrations in 439 forest lakes to the areal proportion of catchment forest clearcuts. To improve quantifications of CO2 sources and sinks in lakes, I analyzed time series of oxygen concentrations and water temperature in five lakes on conditions under which whole-lake metabolism estimates can be inferred from oxygen dynamics given the perturbing influence of atmospheric exchange, mixing and internal waves. The experiments revealed that aquatic greenhouse gas emissions did not respond to nitrate addition or forest clearcutting. Importantly, riparian zones likely buffered clearcut-induced increases in groundwater CO2 and CH4 concentrations. Experimental results were confirmed by monitoring data showing no relationship between CO2 patterns across Swedish lakes and clearcut gradients. Yet, conclusions on internal vs. external CO2 controls largely depended on whether spatially or temporally resolved data was used. Partitioning CO2 sources and sinks in lakes using time series of oxygen was greatly challenged by physical transport and mixing processes. Conclusively, ongoing land use activities in the boreal zone are unlikely to have major effect on headwater greenhouse gas emissions. Yet, system- and scale specific effects cannot be excluded. To reveal these effects, there is a large need of improved methods and design of monitoring programs that account for the large spatial and temporal variability in greenhouse gas dynamics and its controls by abiotic and biotic factors.
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Poonlapthawee, Sirirat. "Gene expression and antibiotic resistance in Escherichia coli from Swedish inland waters." Licentiate thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-28741.

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Extensive use of antibiotics both from human-medicine and veterinary sources are believed to provide selective pressure on bacteria that leads to an increase in antibiotic resistance in environmental waters. Contamination of antibiotic resistant microbes will raise human health risks. Escherichia coli are Gram negative bacilli that belong to the coliform group. E. coli are used as fecal indicators organism (FIO) to determine microbial contamination and water quality. We aimed to investigate the prevalence of antibiotic resistant bacteria in Swedish inland waters and determine the response of uropathogenic E. coli to the environmental waters. Samples were collected in different locations near Örebro Sweden at 4 different time points during 2010-2011. Waters were filtered and FIO were isolated using selective medium. The highest numbers of FIO were detected for both E. coli and enterococci in the river Svartån near the effluent from the wastewater treatment plant (WWTP). Over the two years, 42% and 24% of the antibiotic resistant strains were multi-drug resistant (MDR) E. coli and enterococci, respectively. In addition, 15% of MDR E. coli were extended spectrum beta-lactamase producing and AmpC overproducing strains. A vancomycin resistant E. faecium was also identified. Tetracycline resistance was the most common in FIO isolates. Our study suggests that WWTP distributed FIO and antibiotic resistant bacteria. In a second study we analyzed for the presence of various pharmaceutical residues from lake Mälaren in Västerås Sweden. Some pharmaceutical compounds were present at detectable levels but were removed by the drinking water treatment plant. Quantitative PCR was performed to investigate the effects on genes focused on antibiotic resistance, virulence factors and stress response. Forty one-gene array was developed and tested using tetracycline treatment or environmental water. No significant difference was found when compared to controls in the gene expression profile of bacteria grown in medium prepared with sub-MIC of tetracycline or environmental waters. We concluded that the pharmaceutical levels detected did not exert any significant effects on the E. coli strain tested. From this study, we conclude that MDR bacteria may actually persist in environmental waters in what is considered as a clean urban region. Pharmaceutical pollutants in the inland water did not exert a significant effect on the E. coli, suggesting that MDR strains are released in the effluent of the WWTP rather than induced through selective pressure by the pharmaceuticals contamination.
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Harries, Julie Elizabeth. "A study of the extent of estrogenic contamination of English inland waters." Thesis, Brunel University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336703.

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Lundin, Erik. "The role of inland waters in the carbon cycle at high latitudes." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-84541.

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Understanding the drivers of climate change requires knowledge about the global carbon (C) cycle. Although inland waters play an important role in the C cycle by emitting and burying C, streams and lakes are in general overlooked in bottom-up approached C budgets. In this thesis I estimated emissions of carbon dioxide (CO2) and methane (CH4) from all lakes and streams in a 15 km2 subarctic catchment in northern Sweden, and put it in relation to the total catchment C exchange. I show that high-latitude aquatic systems in general and streams in particular are hotspots for C emission to the atmosphere. Annually, the aquatic systems surveyed in this study emitted about 10.8 ± 4.9 g C m-2 yr-1 (ca. 98 % as CO2) which is more than double the amount of the C laterally exported from the catchment. Although the streams only covered about 4% of the total aquatic area they emitted ca. 95% of the total aquatic C emission. For lake emissions, the ice break-ups were the most important annual events, counting for ca. 45% of the emissions. Overall, streams dominated the aquatic CO2 emission in the catchment while lakes dominated CH4 emission, 96 % and 62 % of the totals, respectively. When summing terrestrial and aquatic C fluxes together it showed that the aquatic emissions alone account for approximately two thirds of the total annual catchment C loss. The consequence of not including inland waters in bottom-up derived C budgets is therefore a risk of overestimating the sink capacity of the subarctic landscape. However, aquatic systems can also act as C sinks, by accumulating C in sediment and thereby storing C over geological time frames. Sediment C burial rates were estimated in six lakes from a chronology based on 210Pb dating of multiple sediment cores. The burial rate ranged between 5 - 25 g C m-2 yr-1, which is of the same magnitude as lake C emissions. I show that the emission:burial ratio is about ten times higher in boreal compared to in subarctic-arctic lakes. These results indicate that the balance between lakes C emission and burial is both directly and indirectly dependent on climate. This process will likely result in a future increase of C emissions from high-latitude lakes, while the C burial capacity of these same lakes sediments weaken.
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Carmo, Alisson Fernando Coelho do. "Three-dimensional modeling of inland waters optical properties from aerial hyperspectral images /." Presidente Prudente, 2019. http://hdl.handle.net/11449/191338.

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Orientador: Nilton Nobuhiro Imai
Abstract: The acquisition of data using Remote Sensing and in-situ sampling allows several data sources to be integrated for the analysis and observations of environmental characteristics and may require computational methods to support the data processing, exploration and analysis. The need to integrate data from different sources is highlighted in studies of dynamic and complex environments that frequently change, such as hydroelectric reservoirs. Reservoirs are artificial ecosystems, which influence directly the regional characteristics, mainly because of their multipurpose use. The interactions of the electromagnetic energy with the optically active components occur along the entire water column, so that the behavior of the light field reflects the changes applied along the entire euphotic zone. However, the values taken from images are used accordingly to a plane and associated with the respective point or area of surface. The calibration of bio-optical models considering only the surface sampling data can not deliver fully effective results because the electromagnetic radiation interacts with the components located along the water column and the response captured by the sensors does not only represent the value associated with the surface. Considering this scenario, this work proposes an investigation on the influence of the vertical distribution of the optical properties along the water column, in order to contemplate records about the interaction in different levels of depth, b... (Complete abstract click electronic access below)
Resumo: A aquisição de dados por meio da combinação de Sensoriamento Remoto e amostragens in-situ permite que várias fontes de dados sejam integradas para a análise e observação de características do alvo de interesse e pode exigir métodos computacionais para apoiar o processamento, exploração e análise de dados. A necessidade de integrar dados de diferentes fontes é destacada em estudos de ambientes dinâmicos e complexos que se alteram frequentemente, como os reservatórios hidrelétricos. Os reservatórios são ecossistemas artificiais, que influenciam diretamente nas características regionais, principalmente devido ao seu uso múltiplo uso. As interações da energia eletromagnética com os componentes opticamente ativos ocorrem ao longo de toda a coluna d’água, de modo que o comportamento do campo de luz reflete as mudanças aplicadas ao longo da zona eufótica. No entanto, as grandezas registradas nas imagens são usados de acordo com o plano e limitadas ao respectivo ponto ou área da superfície. A calibração de modelos bio-ópticos, considerando apenas os dados de amostragem da superfície, pode não fornecer resultados totalmente eficazes, porque a radiação eletromagnética interage com os componentes localizados ao longo da coluna de água e, consequentemente, a resposta capturada pelos sensores não representa apenas o valor associado à superfície. Este trabalho propõe uma investigação sobre a influência da distribuição vertical das propriedades ópticas ao longo da coluna d’água, a fim de co... (Resumo completo, clicar acesso eletrônico abaixo)
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Obiri-Danso, Kwasi. "Seasonal variation of indicator and pathogenic bacteria in coastal and inland bathing waters." Thesis, Lancaster University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301090.

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Rodrigues, Thanan Walesza Pequeno. "From oligo to eutrophic inland waters : advancements and challenges for bio-optical modeling /." Presidente Prudente, 2017. http://hdl.handle.net/11449/150315.

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Orientador: Nilton Nobuhiro Imai
Banca: Deepak Ranjan Mishra
Banca: Arcilan Trevenzoli Assireu
Banca: Maria de Lourdes Bueno Trindade Galo
Banca: Fernanda Sayuri Yoshino Watanabe
Resumo: O presente trabalho teve como objetivo realizar um levantamento detalhado das características bio-ópticas nos reservatórios de Barra Bonita (BB) e Nova Avanhandava (Nav) com o intuito de avaliar o desempenho de uma única abordagem voltada para a estimativa das propriedades ópticas inerentes (POIs), assim como, a concentração de totais sólidos suspensos (TSS). A investigação foi realizada utilizando dados coletados no campo entre 2014 e 2016, incluindo, as POIs, componentes opticamente significativos (COSs) e reflectância de sensoriamento remoto (R_rs). Os dados apresentados dos COSs confirmaram que BB é um ambiente mais túrbido que Nav por apresentar maior produção fitoplanctônica em função do recebimento de altas cargas de nutrientes provenientes da bacia de drenagem. Por outro lado, Nav é um ambiente mais transparente e com maior influência de material inorgânico, o que favorece o surgimento de macrófitas submersas. A concentração de clorofila-a (Chl-a) em BB alcançou máximo de 797.8 µg l-1 em outubro/2014, enquanto Nav apresentou máximo de 38.6 µg l-1 em maio/2016. A variabilidade nos COS esteve altamente vinculada a frequência de chuvas, sendo que no ano de 2014, ocorreu um evento extremo de seca alterando as características biogeoquímicas dos ambientes. BB reagiu de forma mais abrupta que Nav por apresentar um sistema de operação do tipo acumulação e por estar mais próxima das regiões potencialmente poluidoras, diferente de Nav que apresenta um sistema fio-d'água em que ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of the present work was to perform a detailed survey of the bio-optical characteristics of the reservoirs of Barra Bonita (BB) and Nova Avanhandava (Nav) in order to evaluate the performance of a single approach aimed at estimating the inherent optical properties (IOPs), as well as the concentration of total suspended solids (TSS). The research was carried out using data collected in the field between 2014 and 2016, including the IOPs, optically significant components (OSCs) and remote sensing reflectance (R_rs). The data presented from the OSCs confirmed that BB is more turbid than Nav because it presents higher phytoplankton production due to the input of high nutrient loads from the drainage basin. On the other hand, Nav is more transparent with greater influence of inorganic matter, which favors the appearance of submerged macrophytes. The concentration of chlorophyll-a (Chl-a) in BB reached a maximum of 797.8 μg l-1 in October/2014, while Nav presented a maximum of 38.6 μg l-1 in May/2016. The variability in the COS was highly related to the frequency of rainfall, in the year 2014, an extreme drought event occurred, altering the biogeochemical characteristics ... (Complete abstract click electronic access below)
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Rodrigues, Thanan Walesza Pequeno [UNESP]. "From oligo to eutrophic inland waters: advancements and challenges for bio-optical modeling." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150315.

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O presente trabalho teve como objetivo realizar um levantamento detalhado das características bio-ópticas nos reservatórios de Barra Bonita (BB) e Nova Avanhandava (Nav) com o intuito de avaliar o desempenho de uma única abordagem voltada para a estimativa das propriedades ópticas inerentes (POIs), assim como, a concentração de totais sólidos suspensos (TSS). A investigação foi realizada utilizando dados coletados no campo entre 2014 e 2016, incluindo, as POIs, componentes opticamente significativos (COSs) e reflectância de sensoriamento remoto (R_rs). Os dados apresentados dos COSs confirmaram que BB é um ambiente mais túrbido que Nav por apresentar maior produção fitoplanctônica em função do recebimento de altas cargas de nutrientes provenientes da bacia de drenagem. Por outro lado, Nav é um ambiente mais transparente e com maior influência de material inorgânico, o que favorece o surgimento de macrófitas submersas. A concentração de clorofila-a (Chl-a) em BB alcançou máximo de 797.8 µg l-1 em outubro/2014, enquanto Nav apresentou máximo de 38.6 µg l-1 em maio/2016. A variabilidade nos COS esteve altamente vinculada a frequência de chuvas, sendo que no ano de 2014, ocorreu um evento extremo de seca alterando as características biogeoquímicas dos ambientes. BB reagiu de forma mais abrupta que Nav por apresentar um sistema de operação do tipo acumulação e por estar mais próxima das regiões potencialmente poluidoras, diferente de Nav que apresenta um sistema fio-d’água em que não há acumulação e sim fluxo constante da água. Além disso, no âmbito óptico, a absorção em Nav apresentou maior influência do particulado não-algal (NAP) enquanto que em BB, a absorção foi dominada por fitoplâncton. Com base nesses resultados pode-se concluir que os dois ambientes apresentam não só diferenças na qualidade da água, mas também nas propriedades ópticas, o que leva a afirmação de que um modelo único baseado nos dois ambientes pode não ter um bom resultado quando se pretende utilizar uma abordagem empírica. Um algoritmo quase-analítico (QAA) parametrizado para as condições de Nav (QAAOMR) apresentou resultados significativos com erros (erro médio percentual absoluto – MAPE) inferiores a 17% para o coeficiente de absorção total (a_t), 19% para o coeficiente de absorção orgânico detrital (a_CDM) e 47% para o coeficiente de absorção do fitoplâncton (a_ϕ). O respectivo modelo foi utilizado para verificar seu desempenho em um ambiente eutrofizado como BB e a versão parametrizada por Watanabe et al. (2016) e denominada QAABBHR foi aplicada aos dados de Nav. Como resultado, observamos que as duas versões foram adequadas para estimar a_t com erros inferiores a 40%, no entanto, existe ainda a necessidade de melhorar as etapas para estimativa de a_CDM e a_ϕ. No caso de se aplicar um modelo empírico de única abordagem para estimar concentração de TSS para ambos os reservatórios, observamos que essa abordagem não apresentou resultados satisfatórios, portanto, modelos específicos baseados na banda do vermelho do MODIS foram utilizados para mapear TSS em cada um dos reservatórios. Pode-se concluir então, que o conhecimento acerca das propriedades ópticas da água se mostrou determinante para a modelagem bio-óptica, principalmente no que diz respeito aos ambientes altamente contrastantes como BB e Nav.
The objective of the present work was to perform a detailed survey of the bio-optical characteristics of the reservoirs of Barra Bonita (BB) and Nova Avanhandava (Nav) in order to evaluate the performance of a single approach aimed at estimating the inherent optical properties (IOPs), as well as the concentration of total suspended solids (TSS). The research was carried out using data collected in the field between 2014 and 2016, including the IOPs, optically significant components (OSCs) and remote sensing reflectance (R_rs). The data presented from the OSCs confirmed that BB is more turbid than Nav because it presents higher phytoplankton production due to the input of high nutrient loads from the drainage basin. On the other hand, Nav is more transparent with greater influence of inorganic matter, which favors the appearance of submerged macrophytes. The concentration of chlorophyll-a (Chl-a) in BB reached a maximum of 797.8 μg l-1 in October/2014, while Nav presented a maximum of 38.6 μg l-1 in May/2016. The variability in the COS was highly related to the frequency of rainfall, in the year 2014, an extreme drought event occurred, altering the biogeochemical characteristics. BB reacted more abruptly than Nav because it presented an accumulation type operation system and because it is closer to the potentially polluting region. Nav presents a water system in which there is no accumulation but constant flow of water. In addition, in the optical context, the absorption in Nav presented greater influence of the non-algal particulate (NAP) while in BB, the absorption was dominated by phytoplankton. Based on these results, it can be concluded that the two environments present not only differences in water quality but also in optical properties, which leads to the assertion that a single model based on the two environments may not have a good result when it is intended to use empirical approach. A quasi-analytical algorithm (QAA) parameterized for Nav conditions (QAAOMR) presented significant results with errors (mean absolute percentage error - MAPE) lower than 17% for the total absorption coefficient (a_t), 19% for the carbon detrital matter absorption coefficient (a_CDM) and 47% for the absorption coefficient of phytoplankton (a_ϕ). The respective model was used to verify its performance in a eutrophic environment such as BB and the version parameterized by Watanabe et al. (2016) and named QAABBHR was applied to the Nav data. Thus, we note that the two versions were suitable for estimating a_t with errors (MAPE) less than 40%, however, improvements must be carried out for estimating a_CDM and a_ϕ. In the case of applying a single empirical model to estimate TSS concentration for both reservoirs, we observed that it did not present satisfactory results, so specific models based on the MODIS red band were used to map TSS in each of the reservoirs. It can be concluded, therefore, that knowledge about the optical properties of water has proved to be determinant for the bio-optical modeling, especially with respect to highly contrasting environments such as BB and Nav.
CNPq: 200152/2015-7
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Darracq, Amélie. "Long-term development, modeling and management of nutrient loading to inland and coastal waters /." Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm university, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7108.

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Books on the topic "Inland waters"

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Dwight, Kuhn, ed. Inland waters. Detroit, Mich: Blackbirch Press, 2005.

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Passages on inland waters. Wolcott, NY: Whiskey Hill Press, 2004.

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Symoens, J. J., ed. Vegetation of inland waters. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2.

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Likens, Gene E. Biogeochemistry of inland waters: A derivative of Encyclopedia of inland waters. Amsterdam: Elsevier/Academic Press, 2010.

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Likens, Gene E. Biogeochemistry of inland waters: A derivative of Encyclopedia of Inland Waters. Amsterdam: Academic Press, 2010.

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Plankton of inland waters: A derivative of encyclopedia of inland waters. Burlington, MA: Academic Press, 2010.

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Biró, P., and J. F. Talling, eds. Trophic Relationships in Inland Waters. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0467-5.

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Ruddle, Kenneth, and Arif Satria, eds. Managing Coastal and Inland Waters. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9555-8.

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J, Lemoalle, ed. Ecological dynamics of tropical inland waters. Cambridge: Cambridge University Press, 1998.

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Boschet, A.-F. Inland waters: Annual topic update 1999. Luxembourg: Office for Official Publications of the European Communities, 2000.

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Book chapters on the topic "Inland waters"

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Geladze, Vakhtang, Nana Bolashvili, Tamaz Karalashvili, and Nino Machavariani. "Inland Waters." In The Physical Geography of Georgia, 101–25. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90753-2_10.

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New, Tim R. "Australian Inland Waters." In Insect conservation and Australia’s Inland Waters, 19–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57008-8_3.

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Dawson, F. H. "Water Flow and the Vegetation of Running Waters." In Vegetation of inland waters, 283–309. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2_9.

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New, Tim R. "Macroinvertebrates of Inland Waters." In Insect conservation and Australia’s Inland Waters, 161–71. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57008-8_7.

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Laanbroek, Hendrikus J., and Annette Bollmann. "Nitrification in Inland Waters." In Nitrification, 385–403. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555817145.ch15.

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Alcocer, Javier, and Verónica Aguilar-Sierra. "Biodiversity in Inland Waters." In Mexican Aquatic Environments, 43–75. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11126-7_2.

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Wetzel, Robert G. "Water as an Environment for Plant Life." In Vegetation of inland waters, 1–30. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2_1.

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Wiegleb, Gerhard. "Analysis of Flora and Vegetation in Rivers: Concepts and Applications." In Vegetation of inland waters, 311–40. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2_10.

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Melack, John M. "Aquatic Plants in Extreme Environments." In Vegetation of inland waters, 341–78. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2_11.

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Golterman, H. L., R. S. Clymo, E. P. H. Best, and J. Lauga. "Methods of Exploration and Analysis of the Environment of Aquatic Vegetation." In Vegetation of inland waters, 31–61. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3087-2_2.

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Conference papers on the topic "Inland waters"

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Vidot, Jerome, and Richard P. Santer. "Atmospheric correction for inland waters." In Remote Sensing, edited by Charles R. Bostater, Jr. and Rosalia Santoleri. SPIE, 2004. http://dx.doi.org/10.1117/12.511439.

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Prónay, Z., T. Cserny, and E. Törös. "Environmental seismic measurements on inland waters." In 8th EEGS-ES Meeting. European Association of Geoscientists & Engineers, 2002. http://dx.doi.org/10.3997/2214-4609.201406175.

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Guesnet, T. "Modern Concepts In The Design of Vessels For Inland Waters." In Coastal Ships and Inland Waterways. RINA, 1999. http://dx.doi.org/10.3940/rina.cs.1999.11.

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Chapala, Lake, Lake Patzcuaro, Lake Cuitzeo, and Alejandra A. Lopez-Caloca. "Inpainting restoration for inland waters Mexico ecosystems." In 2015 8th International Workshop on the Analysis of Multitemporal Remote Sensing Images (Multi-Temp). IEEE, 2015. http://dx.doi.org/10.1109/multi-temp.2015.7245782.

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Gudelj, Marina. "ACCURACY ANALYSIS OF THE INLAND WATERS DETECTION." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. STEF92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018v/1.5/s02.025.

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Gudelj, Marina. "ACCURACY ANALYSIS OF THE INLAND WATERS DETECTION." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. STEF92 Technology, 2018. http://dx.doi.org/10.5593//sgem2018v/1.5/s02.025.

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"Front Matter: Volume 7150." In Remote Sensing of Inland, Coastal, and Oceanic Waters. SPIE, 2009. http://dx.doi.org/10.1117/12.823180.

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Zavorotny, Valery, and Eric Loria. "Scattering Models for Gnss-R in Inland Waters." In IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2021. http://dx.doi.org/10.1109/igarss47720.2021.9553909.

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Pahlevan, Nima, John R. Schott, and Giuseppe Zibordi. "Enhancing moderate-resolution ocean color products over coastal/inland waters (Conference Presentation)." In Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016, edited by Charles R. Bostater, Stelios P. Mertikas, Xavier Neyt, Caroline Nichol, and Oscar Aldred. SPIE, 2016. http://dx.doi.org/10.1117/12.2240713.

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Gupana, Remika S., Daniel Odermatt, Abolfazl Irani Rahaghi, Camille Minaudo, and Alexander Damm. "Remote sensing of fluorescence in inland waters: improvements from using hyperspectral data." In Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021, edited by Charles R. Bostater and Xavier Neyt. SPIE, 2021. http://dx.doi.org/10.1117/12.2599128.

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Reports on the topic "Inland waters"

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Butman, D., R. Striegl, S. Stackpoole, P. del Giorgio, Y. Prairie, D. Pilcher, P. Raymond, et al. Chapter 14: Inland Waters. Second State of the Carbon Cycle Report. Edited by N. Cavallaro and G. Shrestha. U.S. Global Change Research Program, 2018. http://dx.doi.org/10.7930/soccr2.2018.ch14.

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Walker, Randy M., Ian G. Gross, Cyrus M. Smith, and David E. Hill. ORNL Trusted Corridors Project: Watts Bar Dam Inland Waterway Project. Office of Scientific and Technical Information (OSTI), November 2011. http://dx.doi.org/10.2172/1030617.

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Elias, Joan, Richard Axler, Elaine Ruzycki, and David VanderMeulen. Water quality monitoring protocol for inland lakes: Great Lakes Inventory and Monitoring Network, version 1.2. National Park Service, January 2022. http://dx.doi.org/10.36967/nrr-2290010.

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Pease, Leonard, and Michael Minette. Mesofluidic Inline Separation for Produced Water Treatment - CRADA 537. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1867335.

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Petersen, Keri M. Inline Monitoring of Free Water and Particulate Contamination of Jet A Fuel. Fort Belvoir, VA: Defense Technical Information Center, April 2015. http://dx.doi.org/10.21236/ada623664.

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Saltus, Christina, Molly Reif, and Richard Johansen. waterquality for ArcGIS Pro Toolbox. Engineer Research and Development Center (U.S.), October 2021. http://dx.doi.org/10.21079/11681/42240.

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Monitoring water quality of small inland lakes and reservoirs is a critical component of USACE water quality management plans. However, limited resources for traditional field-based monitoring of numerous lakes and reservoirs that cover vast geographic areas often leads to reactional responses to harmful algal bloom (HAB) outbreaks. Satellite remote sensing methodologies using HAB indicators is a good low-cost option to traditional methods and has been proven to maximize and complement current field-based approaches while providing a synoptic view of water quality (Beck et al. 2016; Beck et al. 2017; Beck et al. 2019; Johansen et al. 2019; Mishra et al. 2019; Stumpf and Tomlinson 2007; Wang et al. 2020; Xu et al. 2019; Reif 2011). To assist USACE water quality management, we developed an ESRI ArcGIS Pro desktop software toolbox (waterquality for ArcGIS Pro) that was founded on the design and research established in the waterquality R software package (Johansen et al. 2019; Johansen 2020). The toolbox enables the detection, monitoring, and quantification of HAB indicators (chlorophyll-a, phycocyanin, and turbidity) using Sentinel-2 satellite imagery. Four tools are available 1) to automate the download of Sentinel-2 Level-2A imagery, 2) to create stacked image with options for cloud and non-water features masks, 3) to apply water quality algorithms to generate relative estimations of one to three water quality parameters (chlorophyll-a, phycocyanin, and turbidity), and 4) to create linear regression graphs and statistics comparing in situ data (from field-based water sampling) to relative estimation data. This document serves as a user's guide for the waterquality for ArcGIS Pro toolbox and includes instructions on toolbox installation and descriptions of each tool's inputs, outputs, and troubleshooting guidance.
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Saltus, Christina, Molly Reif, and Richard Johansen. waterquality for ArcGIS Pro Toolbox : user's guide. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45362.

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Monitoring water quality of small inland lakes and reservoirs is a critical component of the US Army Corps of Engineers (USACE) water quality management plans. However, limited resources for traditional field-based monitoring of numerous lakes and reservoirs covering vast geographic areas often leads to reactional responses to harmful algal bloom (HAB) outbreaks. Satellite remote sensing methodologies using HAB indicators is a good low-cost option to traditional methods and has been proven to maximize and complement current field-based approaches while providing a synoptic view of water quality (Beck et al. 2016; Beck et al. 2017; Beck et al. 2019; Johansen et al. 2019; Mishra et al. 2019; Stumpf and Tomlinson 2007; Wang et al. 2020; Xu et al. 2019; Reif 2011). To assist USACE water quality management, we developed an Environmental Systems Research Institute (ESRI) ArcGIS Pro desktop software toolbox (waterquality for ArcGIS Pro) founded on the design and research established in the waterquality R software package (Johansen et al. 2019; Johansen 2020). The toolbox enables the detection, monitoring, and quantification of HAB indicators (chlorophyll-a, phycocyanin, and turbidity) using Sentinel-2 satellite imagery. Four tools are available: (1) automating the download of Sentinel-2 Level-2A imagery, (2) creating stacked image with options for cloud and non-water features masks, (3) applying water quality algorithms to generate relative estimations of one to three water quality parameters (chlorophyll-a, phycocyanin, and turbidity), and (4) creating linear regression graphs and statistics comparing in situ data (from field-based water sampling) to relative estimation data. This document serves as a user’s guide for the waterquality for ArcGIS Pro toolbox and includes instructions on toolbox installation and descriptions of each tool’s inputs, outputs, and troubleshooting guidance.
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Crystal, Victoria, Justin Tweet, and Vincent Santucci. Yucca House National Monument: Paleontological resource inventory (public version). National Park Service, May 2022. http://dx.doi.org/10.36967/nrr-2293617.

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Yucca House National Monument (YUHO) in southwestern Colorado protects unexcavated archeological structures that were constructed by the Ancestral Puebloan people between 1050 and 1300 CE. It was established by Woodrow Wilson by presidential proclamation in 1919 and named “Yucca House” by archeologist Jesse Fewkes as a reference to the names used for this area by the local Ute, Tewa Pueblo, and other Native groups. It was originally only 3.9 ha (9.6 ac) of land, but in 1990, an additional 9.7 ha (24 ac) of land was donated by Hallie Ismay, allowing for the protection of additional archeological resources. Another acquisition of new land is currently underway, which will allow for the protection of even more archeological sites. The archeological resources at YUHO remain unexcavated to preserve the integrity of the structures and provide opportunities for future generations of scientists. One of the factors that contributed to the Ancestral Puebloans settling in the area was the presence of natural springs. These springs likely provided enough water to sustain the population, and the Ancestral Puebloans built structures around one of the larger springs, Aztec Spring. Yet, geologic features and processes were shaping the area of southwest Colorado long before the Ancestral Puebloans constructed their dwellings. The geologic history of YUHO spans millions of years. The oldest geologic unit exposed in the monument is the Late Cretaceous Juana Lopez Member of the Mancos Shale. During the deposition of the Mancos Shale, southwestern Colorado was at the bottom of an inland seaway. Beginning about 100 million years ago, sea level rose and flooded the interior of North America, creating the Western Interior Seaway, which hosted a thriving marine ecosystem. The fossiliferous Juana Lopez Member preserves this marine environment, including the organisms that inhabited it. The Juana Lopez Member has yielded a variety of marine fossils, including clams, oysters, ammonites, and vertebrates from within YUHO and the surrounding area. There are four species of fossil bivalves (the group including clams and oysters) found within YUHO: Cameleolopha lugubris, Inoceramus dimidius, Inoceramus perplexus, and Pycnodonte sp. or Rhynchostreon sp. There are six species of ammonites in three genera found within YUHO: Baculites undulatus, Baculites yokoyamai, Prionocyclus novimexicanus, Prionocyclus wyomingensis, Scaphites warreni, and Scaphites whitfieldi. There is one unidentifiable vertebrate bone that has been found in YUHO. Fossils within YUHO were first noticed in 1875–1876 by W. H. Holmes, who observed fossils within the building stones of the Ancestral Puebloans’ structures. Nearly half of the building stones in the archeological structures at YUHO are fossiliferous slabs of the Juana Lopez Member. There are outcrops of the Juana Lopez 0.8 km (0.5 mi) to the west of the structures, and it is hypothesized that the Ancestral Puebloans collected the building stones from these or other nearby outcrops. Following the initial observation of fossils, very little paleontology work has been done in the monument. There has only been one study focused on the paleontology and geology of YUHO, which was prepared by paleontologist Mary Griffitts in 2001. As such, this paleontological resource inventory report serves to provide information to YUHO staff for use in formulating management activities and procedures associated with the paleontological resources. In 2021, a paleontological survey of YUHO was conducted to revisit previously known fossiliferous sites, document new fossil localities, and assess collections of YUHO fossils housed at the Mesa Verde National Park Visitor and Research Center. Notable discoveries made during this survey include: several fossils of Cameleolopha lugubris, which had not previously been found within YUHO; and a fossil of Pycnodonte sp. or Rhynchostreon sp. that was previously unknown from within YUHO.
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Cooper, Christopher, Jacob McDonald, and Eric Starkey. Wadeable stream habitat monitoring at Congaree National Park: 2018 baseline report. National Park Service, June 2021. http://dx.doi.org/10.36967/nrr-2286621.

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The Southeast Coast Network (SECN) Wadeable Stream Habitat Monitoring Protocol collects data to give park resource managers insight into the status of and trends in stream and near-channel habitat conditions (McDonald et al. 2018a). Wadeable stream monitoring is currently implemented at the five SECN inland parks with wadeable streams. These parks include Horseshoe Bend National Military Park (HOBE), Kennesaw Mountain National Battlefield Park (KEMO), Ocmulgee Mounds National Historical Park (OCMU), Chattahoochee River National Recreation Area (CHAT), and Congaree National Park (CONG). Streams at Congaree National Park chosen for monitoring were specifically targeted for management interest (e.g., upstream development and land use change, visitor use of streams as canoe trails, and potential social walking trail erosion) or to provide a context for similar-sized stream(s) within the park or network (McDonald and Starkey 2018a). The objectives of the SECN wadeable stream habitat monitoring protocol are to: Determine status of upstream watershed characteristics (basin morphology) and trends in land cover that may affect stream habitat, Determine the status of and trends in benthic and near-channel habitat in selected wadeable stream reaches (e.g., bed sediment, geomorphic channel units, and large woody debris), Determine the status of and trends in cross-sectional morphology, longitudinal gradient, and sinuosity of selected wadeable stream reaches. Between June 11 and 14, 2018, data were collected at Congaree National Park to characterize the in-stream and near-channel habitat within stream reaches on Cedar Creek (CONG001, CONG002, and CONG003) and McKenzie Creek (CONG004). These data, along with the analysis of remotely sensed geographic information system (GIS) data, are presented in this report to describe and compare the watershed-, reach-, and transect-scale characteristics of these four stream reaches to each other and to selected similar-sized stream reaches at Ocmulgee Mounds National Historical Park, Kennesaw Mountain National Battlefield Park, and Chattahoochee National Recreation Area. Surveyed stream reaches at Congaree NP were compared to those previously surveyed in other parks in order to provide regional context and aid in interpretation of results. edar Creek’s watershed (CONG001, CONG002, and CONG003) drains nearly 200 square kilometers (77.22 square miles [mi2]) of the Congaree River Valley Terrace complex and upper Coastal Plain to the north of the park (Shelley 2007a, 2007b). Cedar Creek’s watershed has low slope and is covered mainly by forests and grasslands. Cedar Creek is designated an “Outstanding Resource Water” by the state of South Carolina (S.C. Code Regs. 61–68 [2014] and S.C. Code Regs. 61–69 [2012]) from the boundary of the park downstream to Wise Lake. Cedar Creek ‘upstream’ (CONG001) is located just downstream (south) of the park’s Bannister Bridge canoe landing, which is located off Old Bluff Road and south of the confluence with Meyers Creek. Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ (CONG002 and CONG003, respectively) are located downstream of Cedar Creek ‘upstream’ where Cedar Creek flows into the relatively flat backswamp of the Congaree River flood plain. Based on the geomorphic and land cover characteristics of the watershed, monitored reaches on Cedar Creek are likely to flood often and drain slowly. Flooding is more likely at Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ than at Cedar Creek ‘upstream.’ This is due to the higher (relative to CONG001) connectivity between the channels of the lower reaches and their out-of-channel areas. Based on bed sediment characteristics, the heterogeneity of geomorphic channel units (GCUs) within each reach, and the abundance of large woody debris (LWD), in-stream habitat within each of the surveyed reaches on Cedar Creek (CONG001–003) was classified as ‘fair to good.’ Although, there is extensive evidence of animal activity...
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Rine, Kristin, Roger Christopherson, and Jason Ransom. Harlequin duck (Histrionicus histrionicus) occurrence and habitat selection in North Cascades National Park Service Complex, Washington. National Park Service, April 2022. http://dx.doi.org/10.36967/nrr-2293127.

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Harlequin ducks (Histrionicus histrionicus) are sea ducks that migrate inland each spring to nest along fast-flowing mountain streams. They are considered one of the most imperiled duck species in North America and occur in two distinct populations on the Atlantic and Pacific coasts. The Pacific coast population includes Washington State, where harlequin ducks breed in the Olympic, Cascade, and Selkirk Mountains. This species is designated as a Management Priority Species by the National Park Service within North Cascades National Park Service Complex (NOCA). This report summarizes harlequin duck surveys conducted during 15 years across a 27-year period (1990 and 2017) on major streams within NOCA, and incidental observations collected from 1968–2021. The primary objectives of these surveys were to 1) document the distribution and abundance of harlequin duck observations within NOCA boundaries, 2) describe productivity (number of broods and brood size), 3) describe breeding chronology of harlequin ducks, and 4) describe habitat characteristics of breeding streams. Sixty-eight stream surveys over 15 years resulted in observations of 623 individual harlequin ducks comprising various demographics, including single adults, pairs, and broods. In addition, we collected 184 incidental observations of harlequin ducks from visitors and staff between 1968–2021. Harlequin ducks were observed on 22 separate second- to sixth-order streams throughout NOCA across the entire 53-year span of data, both incidentally and during harlequin duck surveys by Park staff. Harlequin ducks were detected on 8 of the 13 streams that were actively surveyed. Excluding recounts, 88.7% (n = 330) of individual harlequin duck observations during surveys occurred in the Stehekin River drainage. Between all surveys and incidental observations, 135 unpaired females without broods were sighted across all NOCA waterways. Thirty-nine broods were recorded between NOCA surveys and incidental observations, with a mean brood size of 3.61 (± 1.44 SD; range = 2–10). Breeding pairs were recorded as early as April 5 and were seen on streams until June 15, a period of less than seven weeks (median: May 2), but most pairs were observed within a 3-week span, between April 26 and May 17. Single females (unpaired with a male, with (an)other female(s), or with a brood) were observed on streams between April 26 and August 25 (median: July 3), though most observations were made within a 5-week period between June 12 and July 19. Habitat data collected at adult harlequin duck observation sites indicate that the birds often used stream reaches with features that are characteristic of high-energy running water. While adults occupied all instream habitat types identified, non-braided rapids and riffles were used most frequently, followed by pools and backwaters. Larger instream substrate sizes (cobbles and boulders) were present at most observation sites. Adult harlequin ducks were more often found at locations that lacked visible drifting or lodged woody debris, but drift debris was a slightly more abundant debris type. The presence of gravel bars and at least one loafing site was common. Adult harlequin ducks were more often observed in association with vegetation that offered some cover over the channel, but not where banks were undercut. The average channel width at adult observation sites was 34.0 m (range: 6-80 m; n = 114) and 27.6 m (± 15.7 m; range: 10-60 m; n = 12) at brood observation sites. Compared to adult harlequin duck sites, broods were observed more frequently in low velocity habitat (pools, backwaters), but rarely in rapids. Cobble and boulder substrates were still the most dominant substrate type. Contrary to adult ducks, broods were observed most often observed in meandering stream channels, a morphology indicative of low gradient, low velocity stream reaches. Most broods were observed in stream reaches with gravel bars, loafing sites, and...
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