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Development and Evaluation of Runoff-Sediment Evaluation System and BMPs Evaluation Modules for Agricultural Fields using Hourly Rainfall  

Kum, Donghyuk (Department of Regional Infrastructures Engineering, Kangwon National University)
Ryu, Jichul (Department of Regional Infrastructures Engineering, Kangwon National University)
Choi, Jaewan (National Institute of Environmental Research)
Shin, Min Hwan (Department of Regional Infrastructures Engineering, Kangwon National University)
Shin, Dong Suk (National Institute of Environmental Research)
Cheon, Se Uk (National Institute of Environmental Research)
Choi, Joong-Dae (Department of Regional Infrastructures Engineering, Kangwon National University)
Lim, Kyoung Jae (Department of Regional Infrastructures Engineering, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.3, 2012 , pp. 375-383 More about this Journal
Abstract
Soil erosion has been emphasized as serious environmental problem affecting water quality in the receiving waterbodies. Recently, Best Management Practices (BMPs) have been applied at a field to reduce soil erosion and its effectiveness in soil erosion reduction has been monitored with various methods. Although monitoring at fields/watershed outlets would be accurate way for these ends, it is not possible at some fields/watersheds due to various limitations in direct monitoring. Thus modeling has been suggested as an alternative way to evaluate effects of the BMPs. Most models, which have been used in evaluating hydrology and water quality at a watershed, could not reflect rainfall intensity in runoff generation and soil erosion processes. In addition, source codes of these models are not always public for modification/enhancement. Thus, runoff-sediment evaluation system using hourly rainfall data and vegetated filter strip (VFS) evaluation module at field level were developed using open source MapWindow GIS component in this study. This evaluation system was applied to Bangdongri, Chuncheonsi to evaluate its prediction ability and VFS module in this study. The NSE and $R^2$ values for runoff estimation were 0.86 and 0.91, respectively, and measured and simulated sediment yield were 15.2 kg and 16.5 kg indicating this system, developed in this study, can be used to simulate runoff and sediment yield with acceptable accuracies. Nine VFS scenarios were evaluated for effectiveness of soil erosion reduction. Reduction efficiency of the VFS was high when sediment inflow was small. As shown in this study, this evaluation system can be used for evaluation BMPs with local rainfall intensity and variations considered with ease-of-use GIS interface.
Keywords
Best Management Practices (BMPs); MapWindow; Open source GIS; Runoff; Sediment yield; Vegetated filter strip;
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