| Title |
Comparison of Discharge Characteristics of NPS Pollutant Loads from Urban, Agricultural and Forestry Watersheds |
| Authors |
여중현 ( Joong Hyun Yur ) ; 김건하 ( Geon Ha Kim ) |
| Keywords |
Non-point source; Watershed; Loading; Statistical analysis; Water quality; Rainfall |
| Abstract |
Impacts of non-point source pollution on water quality are well known. In this paper, effects of land use, precipitation characteristics, discharge characteristics on non-point source pollutant loadings at urban, agricultural and forestry watersheds were discussed. Rainfall runoffs from fifteen rainfall events were sampled and analysed at two urban watersheds, one rural watershed, and one forestry watershed. EMCs (Event Mean Concentration) were calculated based on monitored flow rates and concentrations. Statistical analysis carried out with runoff loadings and affecting variables indicated that runoff loadings are weakly correlated with the rainfall intensity and the dry days before rainfall events while showed no correlations with rainfall depth nor runoff quantity. By comparing EMCs between study watersheds on log-normal cumulative probability scale, EMCs ranking were in the descending order of urban watershed＞agricultural watershed>forestry watershed for SS, TCOD, TN, and TP. |