| Title |
Runoff Characteristics of NPS Pollution on Field in Rainy Season |
| Authors |
원철희 ( Chul Hee Won ) ; 최용훈 ( Yong Hun Choi ) ; 신민환 ( Min Hwan Shin ) ; 신동석 ( Dong Suk Shin ) ; 강동구 ( Dong Gu Kang ) ; 최중대 ( Joong Dae Choi ) |
| Keywords |
Event mean concentrations; EMC; Pearson correlation coefficient; Pollution Load; Total maximum daily Loads; TMDL; Unit Loading |
| Abstract |
We have examined the runoff characteristics of nonpoint source (NPS) in fields. Two monitoring sites were equipped with an automatic velocity meter and water sampler. Monitoring was conducted at fields 1 and field 2 during the rainfall event. Ten rainfall-runoff events were monitored and analyzed during the study period. The results show that runoff occurred if daily rainfall and intensity were higher than 40 mm and 1.6 mm/hr except a few extreme rainfall events with very high intensity. Runoff of field 1 was approximately twice of that of field 2. Event mean concentrations (EMC) and pollution load of analyzed water quality indices were also higher in field 2 than in field 1. Especially, TN load from field 2 was 75.4 mg/m2 and was about 5 times higher than that from field 1. Analysis of Pearson correlation coefficient of water quality parameter indicates that besides of TN all items in fields 1 have tight relationship respectively (p < 0.01). But those of fields 2 have a significant (p < 0.05). Estimating units loading of NPS, we suggested that variable such as soil texture, rainfall amount and intensity and slope were needed to be considered from agricultural landuses. The results of this study can be used as a basic data in the development and implementation of total maximum daily loads (TMDL) in Korea. |