Abstract
This study, with Hongdong Reservoir, is intended to evaluate the changes in water quality in the lake before and after rainfall in summer. Various non-point source pollutions are scattered around the reservoir, and to determine the pollution level by pollution source, samples were taken at the same point before rainfall (1st), during rainfall (2nd) and after rainfall (3rd) and concentration was measured. Pollutant concentration curve at the measuring points (HDS1, HDS2, HDS3) appeared to be similar with the hydrological curve. When comparing the concentration immediately before rainfall with event mean concentration (EMC), SS and COD were 4 - 59 times and 1 - 4 times, respectively. However, when it comes to total nitrogen (T-N), concentration arrived at the reservoir stayed the range of 1.3 - 12.0 mg/L in all 3 cases without significant variation, which indicated that total nitrogen load is critical when arriving at the reservoir, irrespective of rainfall, and thus it’s necessary to consider non-point source pollution runoff also in addition to point source pollution when developing the water quality improvement measures in reservoir.
Highlights
Reservoirs have been expanded and refurbished as part of the project to improve the water quality and integrated watershed management plan for water quality control was established and introduced
Nutrient salts contained in domestic sewage and industrial wastewater promote the propagation of plankton which increases eutrophication
As most of rainfall (60% ~ 70%) in Korea is concentrated on summer season, considerable amount of pollutants originated from non-point pollution source at farmland or mountainous area have been discharged during rainfall duration
Summary
Reservoirs have been expanded and refurbished as part of the project to improve the water quality and integrated watershed management plan for water quality control was established and introduced. As most of rainfall (60% ~ 70%) in Korea is concentrated on summer season, considerable amount of pollutants originated from non-point pollution source at farmland or mountainous area have been discharged during rainfall duration. Pollutants carried to reservoir with runoff stay at reservoir and excessive nutrients cause eutrophication, deteriorating the water quality in reservoir. It’s necessary to investigate the pollutant concentration before/after rainfall in a bid to introduce effective reservoir water quality management through the disposal or isolate the runoff after initial rainfall. This study, for reservoir water quality management, is aimed at identifying the characteristic of reservoir water pollution concentration before/after rainfall and estimating the nutrient salts so as to provide the base to use reservoir water quality management data
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