scholarly journals Assessment of ecological water quality along a rural to urban land use gradient using benthic macroinvertebrate-based indexes

2018 ◽  
pp. 194-209 ◽  
Author(s):  
Aline Leles Nascimento ◽  
Fernanda Alves-Martins ◽  
Giuliano Buzá Jacobucci
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Benthic Macroinvertebrate ◽  
Ecological Water Quality

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.

Moderating effects of the geometry of reservoirs on the relation between urban land use and water quality

2007 ◽  
Vol 82 (4) ◽  
pp. 175-183 ◽  
Author(s):  
Soon-Jin Hwang ◽  
Sang-Woo Lee ◽  
Ju-Youn Son ◽  
Geun-Ae Park ◽  
Seong-Joon Kim
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Urban Land ◽  
Urban Land Use ◽  
Moderating Effects

scholarly journals THE INFLUENCE OF URBAN LAND USE ON THE WATER QUALITY OF OTAMIRI RIVER FOR MUNICIPAL SUPPLY

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Onosakponome . ◽  
Ogaga Robert
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Urban Land ◽  
Quality Parameters ◽  
Urban Land Use ◽  
Total Hardness ◽  
Human Consumption ◽  
Aquatic Life ◽  
Standard Procedures

Water quality levels of Otamiri River was studied to seek explanations for the variations of water quality indicators in the river and also tried to evaluate the influence of urban land use activities and season on the water quality and to examine the water quality of Otamiri River for agricultural and domestic uses. Water sampling and laboratory analyses were carried out using standard procedures to determine the concentrations of selected parameters in the sample. The data obtained ranged from 21.10 to 98.00µS/cm for Electrical Conductivity, 9.70 to 45.10mg/l for TDS, 5.60 to 20.80mg/l total hardness, 0.00 to 3.06mg/l NO3- , 0.15 to 6.50mg/l PO4, 0.00 to 12.63mg/l SO4 2- , and 14.48 to 32.96mg/l Cl- . Other results ranged from 12.03 to 19.26mg/l BOD5, TSS 40.50 to 1793.50mg/l, turbidity 7.86 to 96.40NTU and pH 6.48 to 6.90 at 29?C. The data clearly show that areas outside the influence of urban activities still maintain their pristine environmental conditions with water quality parameters falling within permissible limits. The water from these areas can sustain aquatic life and are safe for human consumption. However, the results further showed that the midstream area that receive wastes from urban land use activities was polluted with parameters such as NO3- , PO4- , Cl- , BOD5, TDS, and COD being higher than the permissible limit. This demonstrates the influence of urban land use on the water quality of Otamiri River.

scholarly journals Evaluating Land Use Effects on Groundwater Quality in Lagos-Nigeria Using Water Quality Index

2012 ◽  
Vol 4 (2) ◽  
pp. 397 ◽  
Author(s):  
I. I. Balogun ◽  
I. S. Akoteyon ◽  
O. Adeaga
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Groundwater Quality ◽  
Quality Index ◽  
Total Dissolved Solids ◽  
Urban Land ◽  
Urban Land Use ◽  
Total Hardness ◽  
Rural Land ◽  
Rural Land Use

The study relates groundwater quality to land use types in Lagos State. Fourteen samples were collected from hand dug wells and boreholes, seven each from rural and urban land uses in the study area. Ten parameters (pH, electrical conductivity, total dissolved solids, total hardness, calcium, magnesium, chloride, nitrate and sulfate) were determined using standard methods. The resulting water quality indices revealed that 58.09% of the samples were rated very poor while 21.73%, 9.08% and 11.1% were rated poor, good and excellent, respectively in rural land use. The analysis of samples drawn from urban land use revealed that 76.55% of the water was unfit for drinking while 14.4%, 6.42% and 2.63% were found to be very poor, good and excellent, respectively. pH, total dissolved solids, chloride, total hardness and nitrate were beyond the permissible limits for urban land use while, pH, total hardness and nitrate were above permissible limits for rural land use. These parameters were found to be responsible for the poor water quality rating in the study areas. The paper recommends a comprehensive effective sewerage system for safe disposal of sewage, efficient waste water handling and control of urban runoff to prevent groundwater quality deterioration in the study areas.Keywords: Evaluation; Groundwater; Quality; Land use; Water quality index; Lagos-Nigeria.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i2.7142 J. Sci. Res. 4 (2), 397-409 (2012)

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