Paper
Study on the Reduction Assessment of Pollutant Loads by Low Impact Development Technique for Total Maximum Loads Management with Modified SWAT Model
- Authors:
- Lee Kwan-Woo; Ihnsup Han; Kyoung Jae Lim; Ji Chul Ryu
- Abstract
- 2-This study is conducted to evaluate the effect of reducing pollutant loads with application of the low impact development techniques for total maximum loads management. The basic evaluation tool which used in this study is the SWAT model, which is semi-distributed watershed-scale model. Thus, data of topography, land use plan, soil use map, weather, precipitation, point source pollutant loads and water quality of the studying target watershed are investigated. Then, the efficiency of water quality improvement due to the application of low impact development techniques is evaluated with using modified SWAT model. The applied LID technique in this study is filter strips with 30m. The modified SWAT model contains that reflecting of the shape of actual channel for the South-Korean condition. Using the modified SWAT model which reflects the actual shape of the channel, flow rate of the studying target basin has been simulated. As a result of calibration with SWAT-CUP, it shows high applicability with Nash-Sutcliffe Efficiency value of Gyeongan-A site is 0.7733, and Gyeongan-B site is 0.7405. As a result of simulating the T-N loads which validated with the actual water quality data provided by the Ministry of the Environment, it shows that NSE value of Gyeongan-A site is 0.6995, NSE value of Gyeongan-B is 0.6516. It shows that even for the water quality simulation, it has high applicability either. As a result of simulation with scenarios of various conditions, the highest reduction amounts of T-N loads(g) over the area(m²) which applying low impact development techniques to the branches of upstream basin is 1.24g/m².
- Keywords
- Watershed-scale Model; SWAT Model, Low Impact Development Technique, Total Maximum Loads Management
- StartPage
- 410
- EndPage
- 411
- Doi
- 10.5963/JWRHE0404013