| Title |
Runoff Characteristics of Non - point Source According to Landuse Types during Rainfall |
| Authors |
이현동(Hyun Dong Lee),안재환(Jae Hean Ahn),김운지(Woon Ji Kim),배철호(Chul Ho Bae) |
| Abstract |
This study carried out to identify the runoff characteristics of non-point source(NPS) pollution in the Paldang reservoir watershed. Several sub-basins were selected and used as the study sub-basins in which major landuse types were different each other. Rainfall, water quality and flow rate were observed by landuse types in the study sub-basins. Peak time of storm water runoff and pollutant concentration showed big differences depending on landuse and rainfall conditions at each corresponding sub-basins. Although slight differences in storm flow rate were observed depending on rainfall, sudden increase and decrease in flow rate were, however, noted in forest/resort and urban areas. While in agricultural areas, the slope of the hydrograph of storm runoff flow increased and decreased gradually. The variation of pollutant concentrations in terms of BOD, COD, SS and T-P was large depending on the flow rate of stormwater. On the other hand, little change of T-N concentration in stormwater was appeared. In forest/resort areas, the BOD load discharged was 1.53 ㎏/ha/day for total rainfall of 140.4 ㎜ during three rainfall. The BOD loading from agricultural areas was 1.93 ㎏/ha/day for total rainfall of 84.9 ㎜. And BOD loading from urban areas was 22.84 ㎏/ha/day for total rainfall of 72.94 ㎜. Although the total rainfall in the urban areas was smaller than other areas, the BOD load attributed to NPS in urban areas was much greater. |