The Love River basin is an important urban river basin in Kaohsiung City, Taiwan. The main cause of the river water quality deterioration is the discharges of municipal wastewaters into the river. In this study, river water analyses, sediment quality investigation, and water quality modeling were conducted to (1) evaluate the impacts of pollutant loadings on Love River and (2) develop basin management strategies. Geo-accumulation index and enrichment factor evaluation indicate that the sediments contained high concentrations of Cu, Zn, Ni, Cr, and Pb. Their concentrations were close to the effect range median implying heavy metals had adverse impacts on aquatics. The WASP (Water Quality Analysis Simulation Program) model was used to perform water quality modeling, and results indicate that sewage discharge from a sewage trench caused significant impairment of river water quality. An on-site aerated gravel-packed contact bed (CB) system was built in the riverside for 10% of river water treatment. The CB system could remove 52% of ammonia nitrogen (NH 3 -N) and 64% of biochemical oxygen demand (BOD) from the influents. Modeling results show that an expansion of the CB system for 40% of river water treatment could further reduce NH 3 -N and BOD concentrations and improve the water quality.
This study adopted the water quality model [Water Quality Analysis Simulation Program (WASP)] to simulate and evaluate the impacts of the opening and closure of an interception system at the tributary of Love River on mainstream water quality. The gates were opened respectively for 4, 12, and 24 hours to assess the impact on biochemical oxygen demand (BOD) and ammonia nitrogen (NH3-N) in the water bodies of Love River. The WASP model was used to evaluate the self-purification capacity of the river. According to the results of the model estimation, it takes 5 days for NH3-N and BOD in the water bodies of Love River to return to normal and for the water to restore its original water quality after the closure of the Baozhu Ditch gate. Results of this study can be used as a reference for Love River watershed management, and the WASP modeling can be applied for decision makers to develop appropriate management strategies of the interception system.
the paper introduced that use of remote sensing data、DEM data、land use and land cove GIS data to monitoring the soil erosion in Mingjing River valley. Instead of using the parameters in sample sites in field for USLE model calculation we extraction the parameters from satellite data. Landsat TM and ETM temporal data were used to investigate the changes in between 1993 and 2000. The results improve that there was ±5% soil erosion difference between our calculation results from ETM data in 2000 and field statistical results in 1999.
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