STEPL WEB 모형을 이용한 농촌지역 비점오염원저감 대책 모의

초록

Sediment-laden water is problematic in aquatic ecosystem and for hydraulic structures in a watershed, and agriculture area in a watershed is one of sourceareas of nonpoint source (NPS), since soil surface typically exposures due to agricultural activities. Especially, severe sediment might flow into streamwhen agricultural area is located near stream like the Imha-dam watershed. Soil erosion is affected by precipitation, therefore there is a need to considerprecipitation characteristics in soil erosion and best management practices (BMPs) simulation. The Web-based Spreadsheet Tool for the Estimation ofPollutant Load (STEPL WEB) allows estimating long-term sediment loads and the impact of best management practices to reduce sediment loads. STEPLWEB and predicted precipitation data by MIROC-ESM model was used to estimate sediment loads and its reduction by filter strip and conversion ofagricultural area to forest in the future 30 years. The result indicates that approximately 70 % of agricultural area requires filter strip installation or thatapproximately 50 % of agricultural area needs to be converted to forest, for 41 % of sediment load reduction.

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