| Title |
Estimation of Non - Point Source Pollutant Unit - loads in Surface Runoff Considering Land - use and Basin Characteristics |
| Authors |
신은성(Eun Sung Shin),최지용(Ji Yong Choi),이동훈(Dong Hoon Lee) |
| Abstract |
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. Also, 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 estimate the unit load by land use and livestock breeding level in order to promote effective management of the non-point source of pollution in rural areas. The watershed under investigation consists of eleven sub-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(T-P), are determined. The results are summarized below: 1. Annual runoff loading of SS. BOD, COD, T-P, and T-N were estimated to be 423.4, 20.0, 56.6, 2.6, 20.9㎏/ha.yr respectively. 2. Runoff loadings by landuse appeared to have following relationship. ·COD : L(㎏/yr) = 187.3 × Paddy + 110.1 × Field + 24.3 × Moun. (R² = 0.92) ·T-N : L(㎏/yr) = 77.8 × Paddy + 26.1 × Field + 11.1 × Moun. (R² = 0.96) ·T-P : L(㎏/yr) = 14.8 × Paddy + 4.3 × Field + 0.3 × Moun. (R² = 0.96) 3. Considering livestock breeding level, the runoff loading by land use were observed as below: ·COD : L(㎏/yr) = 173.6×Paddy+63.0×Field+24.8×Moun.+14.7LU(R² = 0.93) ·T-N : L(㎏/yr) = 74.3×Paddy+l4.0×Field+11.2×Moun. + 3.8LU(R² = 0.97) ·T-P : L(㎏/yr) = 7.7×Paddy+ 4.2×Field+ 0.3×Moun. + 0.3LU(R² = 0.98) |