scholarly journals Stream water quality and benthic macroinvertebrate ecology in a coal-mining, acid-sensitive region

2007 ◽  
Author(s):  
George T. Merovich
Keyword(s):  
Water Quality ◽  
Coal Mining ◽  
Stream Water ◽  
Benthic Macroinvertebrate ◽  
Stream Water Quality ◽  
Sensitive Region

scholarly journals An Estimated Structural Equation Model to Assess the Effects of Land Use on Water Quality and Benthic Macroinvertebrates in Streams of the Nam-Han River System, South Korea

2020 ◽  
Vol 17 (6) ◽  
pp. 2116 ◽  
Author(s):  
Jong-Won Lee ◽  
Sang-Woo Lee ◽  
Kyung-Jin An ◽  
Soon-Jin Hwang ◽  
Nan-Young Kim
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Structural Equation ◽  
Agricultural Land ◽  
Stream Water ◽  
Equation Model ◽  
Urban Land Use ◽  
Benthic Macroinvertebrate ◽  
Agricultural Land Use ◽  
Stream Water Quality

The extent of anthropogenic land use in watersheds determines the amount of pollutants discharged to streams. This indirectly and directly affects stream water quality and biological health. Most studies have therefore focused on ways to reduce non-point pollution sources to streams from the surrounding land use in watersheds. However, the mechanistic pathways between land use and the deterioration of stream water quality and biological assemblages remain unclear. This study estimated a structural equation model (SEM) representing the impact of agricultural and urban land use on water quality and the benthic macroinvertebrate index (BMI) using IBM AMOS in the Nam-Han river systems, South Korea. The estimated SEM showed that the percent of urban and agricultural land in the watersheds significantly affected both the water quality and the BMI of the streams. Specifically, a higher percent of urban land use had directly increased the biochemical oxygen demand (BOD) and total phosphorus (TP), and deteriorated the BMI of streams. Similarly, higher proportions of agricultural land use had also directly increased the BOD, total nitrogen (TN), and total phosphorus (TP) concentrations, and lowered the BMI of streams. In addition, it was observed that the percent of urban and agricultural land use had indirectly deteriorated the BMI through increased BOD. However, we were not able to observe any significant indirect effect of the percent of urban and agricultural land use through increased nutrients including TN and TP. These results indicate that increased urban and agricultural land use in the watersheds had directly and indirectly affected the physicochemical characteristics and benthic macroinvertebrate communities in streams. Our findings emphasize the need to develop more elaborate environmental management and restoration strategies to improve the water quality and biological status of streams.

Data from selected U.S. Geological Survey National Stream Water-Quality Networks (WQN)

Data Series ◽  
10.3133/ds37 ◽  
1996 ◽  
Author(s):  
Richard B. Alexander ◽  
J.R. Slack ◽  
A.S. Ludtke ◽  
K.K. Fitzgerald ◽  
T.L. Schertz ◽  
...  
Keyword(s):  
Water Quality ◽  
Stream Water ◽  
Geological Survey ◽  
Stream Water Quality

Application of Expert Systems Technology in Water Quality Modeling

1989 ◽  
Vol 21 (8-9) ◽  
pp. 1045-1056 ◽  
Author(s):  
Thomas O. Barnwell ◽  
Linfield C. Brown ◽  
Wiktor Marek
Keyword(s):  
Water Quality ◽  
Expert Systems ◽  
Knowledge Engineering ◽  
Stream Water ◽  
Environmental Modeling ◽  
Water Quality Modeling ◽  
Stream Water Quality ◽  
Quality Model ◽  
Knowledge Based ◽  
Available Technology

Computerized modeling is becoming an integral part of decision making in water pollution control. Expert systems is an innovative methodology that can assist in building, using, and interpreting the output of these models. This paper reviews the use and evaluates the potential of expert systems technology in environmental modeling and describes elements of an expert advisor for the stream water quality model QUAL2E. Some general conclusions are presented about the tools available to develop this system, the level of available technology in knowledge-based engineering, and the value of approaching problems from a knowledge engineering perspective.

scholarly journals Local and downstream cumulative effects of traditional meadow management on stream-water quality and multiple riparian taxa

2021 ◽  
pp. 148601
Author(s):  
Alberto Maceda-Veiga ◽  
Sergio Albacete ◽  
Núria Flor-Arnau ◽  
Cristiana Vieira ◽  
Vicenç Bros ◽  
...  
Keyword(s):  
Water Quality ◽  
Stream Water ◽  
Cumulative Effects ◽  
Stream Water Quality
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