| Title |
Analysis of Total Nitrogen Reduction Efficiency with Established Riparian Buffer System using SWAT-REMM Model in Bonggok Watershed |
| Authors |
류지철 ( Ji Chul Ryu ) ; 강현우 ( Hyun Woo Kang ) ; 김남원 ( Nam Won Kim ) ; 장원석 ( Won Seok Jang ) ; 이지원 ( Ji Won Lee ) ; 문종필 ( Jong Pil Moon ) ; 이규승 ( Kyu Seung Lee ) ; 임경재 ( Kyoung Jae Lim ) |
| Keywords |
BMPs; NPS. Riparian buffer system; SWAT-REMM; Total nitrogen |
| Abstract |
In recent years, riparian buffer system has been known as one of the effective best management practices. However, establishment of riparian buffer system in aspect of plant species and its position in the riparian buffer zone has not been investigated due to lack of efficient evaluation method for the analysis of water quality improvement with established riparian buffer system. To solve this problem, the SWAT-REMM prototype was developed by the researchers in Canada. But, SWAT-REMM model can not consider the NO(3)-N load into riparian buffer system through subsurface flow. Thus to solved this problem, Fortran code of SWAT-REMM model was modified. This modified SWAT-REMM system was applied to the Bonggok watershed. Three riparian buffer scenarios, 15 m, 10 m, 5 m width for tree and grass, were made to evaluate the effects of riparian buffer system on water quality improvement. Reduction efficiency of T-N by riparian buffer system of 15 m wide was the greatest (6~37%, depending on subwatershed characteristics) among 3 scenarios. It indicates that the reduction efficiency of T-N load has increasing-tendency, as buffer width increasing. The results obtained from the analysis showed that wide buffer zones are found to be more effective in reducing non-point pollutant than narrow buffer zones in the riparian buffer zone system. Hence, the SWAT-REMM model could be efficiently used for evaluation and design the most effective riparian buffer systems to reduce pollutant loads to the watershed although many limitations still exist in SWAT-REMM model. |