| Title |
Characteristics of Non - Point Source Pollutants in Surface Runoff from Rural Area |
| Authors |
신은성(Eun Sung Shin),최지용(Ji Yong Choi),이동훈(Dong Hoon Lee) |
| Abstract |
The principal non-point sources of water pollution from agriculture has been known as nutrients, organic matters, sediments, fertilizer and toxic chemicals. Among all of these pollutants, nutrients give a significant impact on water quality, such as eutrophication. For issues of integrated water quality management, a thorough investigation on both point source and non-point source of pollution loaded from streamlets to rivers should be conducted. Therefore, it is necessary to investigate the relationship between land use, pollutant discharge from non-point sources, and the unit load and its contribution to total pollution loadings. The objectives of this study is to investigate the surface runoff characteristics of agricultural pollutants from non-point sources by land use in order to promote effective management of the non-point source of pollution in rural areas. The watershed under investigation consists of eleven basins(smaller than 500ha)located in Chunchon city in Kangwon Province. Flow and quality parameters, such as biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(T-N), and total phosphorous are summarized below : 1. Slower runoff flow was observed in rural areas than areas of built-up(urban areas). Peak SS and T-P concentrations were observed prior to the flow. T-N was decreased as flow increased due to high ratio of NO₃-N. 2. The concentration graph of SS and T-P, and flow was appeared to be a clock-wise hook-shape curve. The maximum concentration was observed on the point of maximum flow. However, the concentration of T-N showed on opposite curve to the graph above. |