| Title |
Estimation of the Unit Loading and Total Loading of Nonpoint Source in Paldang Watershed by Runoff Loading during the Rainfall |
| Authors |
이현동(Hyun Dong Lee),안재환(Jae Hwan Ahn),배철호(Chul Ho Bae),김운지(Woon Ji Kim) |
| Abstract |
In the study, unit loading and total loading on landuse types in Paldang watershed were estimated by using runoff loading of nonpoint source on nonurban(Forest/Resort and Rice/Crops area) areas and urban areas. Those areas were selected as river basins that have similar landuse types that could be represented as unit landuse types. Although it was difficult to compare directly unit loading proposed in this study with that used conventionally because of the difference of field investigation. But the results showed that unit loading on landuse types may be included in the range of conventional unit loading. The results also showed that total loading of BOD was 29,085 ton/year in Paldang watershed. The contribution ratio of South Han River in Paldang watershed was about 69%. Among total BOD loading generated of 18,097 ton/year (62%) attributed to loading from urban areas and 5,703 ton/year derived in forest/resort areas. While 5,285 ton/year was loaded in rice/crops areas. In addition, the contribution ratio of total nitrogen (T-N) in urban areas was also higher than other landuse types. On the other hand, the ratio of total phosphorous (T-P) was lower than in all areas. In case of considering total loading generated of point source, the contribution ratios of nonpoint source pollutants such as BOD. T-N, and T-P were 37.8%. 38.4% and 18.5% respectively. Among those pollutants. the contribution ratio T-N was higher than other pollutants. |