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https://www.readbyqxmd.com/read/28511353/assessment-of-water-retention-function-as-tool-to-improve-integrated-watershed-management-case-study-of-poprad-river-basin-slovakia
#1
Barbora Šatalová, Pavol Kenderessy
The presented study concentrates on assessing the ecosystem function of water retention. The water retention function is defined as the ability of the landscape to retain water, slow runoff and encourage water infiltration. The water retention function was expressed by calculating the hydric significance (HS) indicator. This method is based on scoring the individual input parameters according to their overall impact on watershed hydrology. The study was conducted on a sample area of Poprad River basin. The final results presented a spatial distribution of hydric function within the watershed classified according to its significance into four classes (from limited to excellent significance)...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28511348/integrated-flood-hazard-assessment-based-on-spatial-ordered-weighted-averaging-method-considering-spatial-heterogeneity-of-risk-preference
#2
Yangfan Xiao, Shanzhen Yi, Zhongqian Tang
Flood is the most common natural hazard in the world and has caused serious loss of life and property. Assessment of flood prone areas is of great importance for watershed management and reduction of potential loss of life and property. In this study, a framework of multi-criteria analysis (MCA) incorporating geographic information system (GIS), fuzzy analytic hierarchy process (AHP) and spatial ordered weighted averaging (OWA) method was developed for flood hazard assessment. The factors associated with geographical, hydrological and flood-resistant characteristics of the basin were selected as evaluation criteria...
May 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28507148/correction-for-hobbie-et-al-contrasting-nitrogen-and-phosphorus-budgets-in-urban-watersheds-and-implications-for-managing-urban-water-pollution
#3
(no author information available yet)
No abstract text is available yet for this article.
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28503260/dynamics-of-hexavalent-chromium-in-four-types-of-aquaculture-ponds-and-its-effects-on-the-morphology-and-behavior-of-cultured-clarias-gariepinus-burchell-1822
#4
Moshood Keke Mustapha
Hexavalent chromium is a bio accumulative toxic metal in water and fish. It enters aquaculture ponds mainly through anthropogenic sources. Hexavalent chromium concentrations and its effects on the morphology and behavior of Clarias gariepinus were investigated from four aquaculture ponds for 12 weeks. Chromium was measured using diphenyl carbohdrazide method; alkalinity and hardness were measured using colometric method and analyzed with Bench Photometer. Temperature and pH were measured using pH/EC/TDS/Temp combined tester...
April 2017: Toxicological Research
https://www.readbyqxmd.com/read/28499222/the-actual-role-of-oxygen-deficit-in-the-linkage-of-the-water-quality-and-benthic-phosphorus-release-potential-implications-for-lake-restoration
#5
Olga Tammeorg, Tõnu Möls, Juha Niemistö, Heidi Holmroos, Jukka Horppila
Human activities in watersheds have resulted in huge accumulations of phosphorus (P) in sediments that have subsequently hindered restoration efforts of lake water quality managers worldwide. Much controversy exists about the factors that control the release of P from sediments (internal P loading). One of the main debates concerns the role of oxygen deficit (anoxia) in the regulation of water quality. Our results based on a comprehensive set of lakes worldwide demonstrate that internal P loading (IPtot) plays a significant role in water quality regulation...
May 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28499221/a-water-quality-management-strategy-for-regionally-protected-water-through-health-risk-assessment-and-spatial-distribution-of-heavy-metal-pollution-in-3-marine-reserves
#6
Yinan Zhang, Chunli Chu, Tong Li, Shengguo Xu, Lei Liu, Meiting Ju
Severe water pollution and resource scarcity is a major problem in China, where it is necessary to establish water quality-oriented monitoring and intelligent watershed management. In this study, an effective watershed management method is explored, in which water quality is first assessed using the heavy metal pollution index and the human health risk index, and then by classifying the pollution and management grade based on cluster analysis and GIS visualization. Three marine reserves in Tianjin were selected and analyzed, namely the Tianjin Ancient Coastal Wetland National Nature Reserve (Qilihai Natural Reserve), the Tianjin DaShentang Oyster Reef National Marine Special Reserve (DaShentang Reserve), and the Tianjin Coastal Wetland National Marine Special Reserve (BinHai Wetland Reserve) which is under construction...
May 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28488149/identification-of-water-quality-management-policy-of-watershed-system-with-multiple-uncertain-interactions-using-a-multi-level-factorial-risk-inference-based-possibilistic-probabilistic-programming-approach
#7
Jing Liu, Yongping Li, Guohe Huang, Haiyan Fu, Junlong Zhang, Guanhui Cheng
In this study, a multi-level-factorial risk-inference-based possibilistic-probabilistic programming (MRPP) method is proposed for supporting water quality management under multiple uncertainties. The MRPP method can handle uncertainties expressed as fuzzy-random-boundary intervals, probability distributions, and interval numbers, and analyze the effects of uncertainties as well as their interactions on modeling outputs. It is applied to plan water quality management in the Xiangxihe watershed. Results reveal that a lower probability of satisfying the objective function (θ) as well as a higher probability of violating environmental constraints (q i ) would correspond to a higher system benefit with an increased risk of violating system feasibility...
May 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28482303/environmental-and-economic-risks-assessment-under-climate-changes-for-three-land-uses-scenarios-analysis-across-teshio-watershed-northernmost-of-japan
#8
Min Fan, Hideaki Shibata, Li Chen
Land use and climate changes affect on the economy and environment with different patterns and magnitudes in the watershed. This study used risk analysis model stochastic efficiency with respect to a function (SERF) to evaluate economic and environmental risks caused by four climate change scenarios (baseline, small-, mid- and large changes) and three land uses (paddy dominated, paddy-farmland mixture and farmland dominated for agriculture) in Teshio watershed in northern Hokkaido, Japan. Under the baseline climate conditions, the lower ranking of economic income of crop yield and higher ranking of pollutant load from agricultural land were both predicted in paddy dominated for agriculture, suggesting that the paddy dominated system caused higher risks of economic and environmental variables compared to other two land uses...
May 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28469703/application-of-denitrifying-wood-chip-bioreactors-for-management-of-residential-non-point-sources-of-nitrogen
#9
REVIEW
E V Lopez-Ponnada, T J Lynn, M Peterson, S J Ergas, J R Mihelcic
Two important and large non-point sources of nitrogen in residential areas that adversely affect water quality are stormwater runoff and effluent from on-site treatment systems. These sources are challenging to control due to their variable flow rates and nitrogen concentrations. Denitrifying bioreactors that employ a lignocellulosic wood chip medium contained within a saturated (anoxic) zone are relatively new technology that can be implemented at the local level to manage residential non-point nitrogen sources...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28469260/using-chironomus-dilutus-to-identify-toxicants-and-evaluate-the-ecotoxicity-of-sediments-in-the-haihe-river-basin
#10
Xiaolei Zhu, Baoqing Shan, Wenzhong Tang, Chao Zhang
To effectively manage a watershed and successfully restore a river system, it is very important to assess the toxicity of sediments and identify the substances causing the toxicity. Seventy-six sediments collected in the Haihe River Basin (HRB) in China were screened for acute toxicity using Chironomus dilutus. We found that sediments from more than 32% of sampling sites, distributed mainly in the Ziya tributary and along the estuary, were acutely toxic to midges. A toxicity identification evaluation showed that the toxicity of the sediment samples was mainly from ammonia nitrogen, metals, and organics...
May 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28454067/assessment-of-the-swat-model-to-simulate-a-watershed-with-limited-available-data-in-the-pampas-region-argentina
#11
Martín Romagnoli, Margarita Portapila, Alfredo Rigalli, Gisela Maydana, Martín Burgués, Carlos M García
Argentina has been among the world leaders in the production and export of agricultural products since the 1990s. The Carcarañá River Lower Basin (CRLB), a cropland of the Pampas region supplied by extensive rainfall, is located in an area with few streamgauging and other hydrologic/water-quality stations. Therefore, limited hydrologic data are available resulting in limited water-resources assessment. This work explores the application of Soil and Water Assessment Tool (SWAT) model to the CRLB in the Santa Fe province of the Pampas region...
April 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28448927/time-varying-sensitivity-analysis-of-hydrologic-and-sediment-parameters-at-multiple-timescales-implications-for-conservation-practices
#12
Hui Xie, Zhenyao Shen, Lei Chen, Jiali Qiu, Jianwei Dong
Environmental models can be used to better understand the hydrologic and sediment behavior in a watershed system. However, different processes may dominate at different time periods and timescales, which highly complicate the model interpretation. The related parameter uncertainty may be significant and needs to be addressed to avoid bias in the watershed management. In this study, we used the time-varying and multi-timescale (TVMT) method to characterize the temporal dynamics of parameter sensitivity at different timescales in hydrologic and sediment modeling...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28445546/a-coral-algal-phase-shift-in-mesoamerica-not-driven-by-changes-in-herbivorous-fish-abundance
#13
Jesús Ernesto Arias-González, Tak Fung, Robert M Seymour, Joaquín Rodrigo Garza-Pérez, Gilberto Acosta-González, Yves-Marie Bozec, Craig R Johnson
Coral-algal phase shifts in which coral cover declines to low levels and is replaced by algae have often been documented on coral reefs worldwide. This has motivated coral reef management responses that include restriction and regulation of fishing, e.g. herbivorous fish species. However, there is evidence that eutrophication and sedimentation can be at least as important as a reduction in herbivory in causing phase shifts. These threats arise from coastal development leading to increased nutrient and sediment loads, which stimulate algal growth and negatively impact corals respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28442856/functional-outcome-of-fixation-of-complex-intra-articular-distal-radius-fractures-with-a-variable-angle-distal-radius-volar-rim-plate
#14
M Spiteri, W Ng, J Matthews, D Power
Aim To evaluate the outcome of these complex fractures using a volar approach and the DePuy Synthes variable-angle 2.4-mm distal radius rim plate. This plate is precontoured to the volar rim for placement distal to the watershed line allowing purchase of the rim fragment of the lunate facet. Its low profile and smooth edges are designed to minimize flexor tendon irritation. Method We report on a consecutive series of far distal AO-23B3 and AO-23C3 fractures treated using this plate in a tertiary hand center between November 2011 and May 2014...
April 2017: Journal of Hand and Microsurgery
https://www.readbyqxmd.com/read/28441601/improving-understanding-of-mixed-land-use-watershed-suspended-sediment-regimes-mechanistic-progress-through-high-frequency-sampling
#15
Elliott Kellner, Jason A Hubbart
Given the importance of suspended sediment to biogeochemical functioning of aquatic ecosystems, and the increasing concern of mixed-land-use effects on pollutant loading, there is an urgent need for research that quantitatively characterizes spatiotemporal variation of suspended sediment dynamics in contemporary watersheds. A study was conducted in a representative watershed of the central United States utilizing a nested-scale experimental watershed design, including five gauging sites (n=5) partitioning the catchment into five sub-watersheds...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28433768/response-of-evapotranspiration-to-changes-in-land-use-and-land-cover-and-climate-in-china-during-2001-2013
#16
Gen Li, Fangmin Zhang, Yuanshu Jing, Yibo Liu, Ge Sun
Land surface evapotranspiration (ET) is a central component of the Earth's global energy balance and water cycle. Understanding ET is important in quantifying the impacts of human influences on the hydrological cycle and thus helps improving water use efficiency and strengthening water use planning and watershed management. China has experienced tremendous land use and land cover changes (LUCC) as a result of urbanization and ecological restoration under a broad background of climate change. This study used MODIS data products to analyze how LUCC and climate change affected ET in China in the period 2001-2013...
April 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28431371/past-present-and-future-land-use-changes-and-their-impact-on-water-balance
#17
Sananda Kundu, Deepak Khare, Arun Mondal
Landuse change influences the water balance of a region affecting the available water along with the change in the evapotranspiration (ET). The major objectives of this study are to assess the landuse change and its impact on the water balance of the study area, which is a part of the Narmada river basin in Madhya Pradesh, India. Landuse changes of 1990, 2000 and 2011 have been analyzed and the Markov Chain model has been used to predict decadal change of 2020, 2030, 2040 and 2050 landuse. The influence of the past, present and future landuse change on water balance has been analyzed with the SWAT (Soil and Water Analysis Tool) model in the study area...
April 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28431370/hydrodynamic-influence-on-reservoir-sustainability-in-semi-arid-climate-a-physicochemical-and-environmental-isotopic-study
#18
Rawaa Ammar, Véronique Kazpard, Antoine G El Samrani, Nabil Amacha, Zeinab Saad, Lei Chou
Water scarcity and increasing water demand require the development of water management plans such as establishing artificial lakes and dams. Plans to meet water needs are faced by uprising challenges to improve water quality and to ensure the sustainability of hydro-projects. Environmental isotopes coupled to water physicochemical characteristics were investigated over a biennial cycle to assess both geomorphological and environmental impacts on the water quality of a reservoir situated in an intensively used agricultural watershed under a Mediterranean semi-arid climate...
April 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28431347/improving-water-quality-in-china-environmental-investment-pays-dividends
#19
Yongqiang Zhou, Jianrong Ma, Yunlin Zhang, Boqiang Qin, Erik Jeppesen, Kun Shi, Justin D Brookes, Robert G M Spencer, Guangwei Zhu, Guang Gao
This study highlights how Chinese economic development detrimentally impacted water quality in recent decades and how this has been improved by enormous investment in environmental remediation funded by the Chinese government. To our knowledge, this study is the first to describe the variability of surface water quality in inland waters in China, the affecting drivers behind the changes, and how the government-financed conservation actions have impacted water quality. Water quality was found to be poorest in the North and the Northeast China Plain where there is greater coverage of developed land (cities + cropland), a higher gross domestic product (GDP), and higher population density...
July 1, 2017: Water Research
https://www.readbyqxmd.com/read/28431346/caged-gammarus-as-biomonitors-identifying-thresholds-of-toxic-metal-bioavailability-that-affect-gammarid-densities-at-the-french-national-scale
#20
Alexandre Ciliberti, Arnaud Chaumot, Rémi Recoura-Massaquant, André Chandesris, Adeline François, Marina Coquery, Martial Ferréol, Olivier Geffard
Bioaccumulated concentrations of toxic elements in biomonitor invertebrate species have already been used to successfully link metal bioavailability and impairments of stream macroinvertebrate communities at the scale of the watershed. However, implementing this empirical comparative approach at a greater spatial scale remains a challenge due to the diversity of biogeographical contexts encompassed by regional and national scales. We showed in previous studies that the use of standard organisms caged permits the use of a common biomonitor over a far greater geographical range, while limiting the influence of confounding factors on levels of bioavailable contamination...
July 1, 2017: Water Research
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