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http://dx.doi.org/10.5389/KSAE.2012.54.4.001

HSPF Modeling for Identifying Runoff Reduction Effect of Nonpoint Source Pollution by Rice Straw Mulching on Upland Crops  

Jung, Chung-Gil (건국대학교 대학원 사회환경시스템공학과)
Park, Jong-Yoon (건국대학교 대학원 사회환경시스템공학과)
Lee, Hyung-Jin (한강물환경연구소)
Choi, Joong-Dae (강원대학교 지역건설공학과)
Kim, Seong-Joon (건국대학교 사회환경시스템공학과)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.54, no.4, 2012 , pp. 1-8 More about this Journal
Abstract
This study is to assess the reduction of non-point source pollution loads for rice straw surface covering of upland crop cultivation at a watershed scale. For Byulmi-cheon watershed ($1.21km^2$) located in the upstream of Gyeongancheon, the HSPF (Hydrological Simulation Program-Fortran), a physically based distributed hydrological model was applied. Before evaluation, the model was calibrated and validated using 9 rainfall events. The Nash-Sutcliffe model efficiency (NSE) for streamflow was 0.62~0.78 and the NSE for water quality (Sediment, T-N, and T-P) were 0.68, 0.60, and 0.58 respectively. From the field experiment of 16 rainfall events, the rice straw covering reduced surface runoff average 10 % compared to normal surface condition. By handling infiltration parameter (INFILT) in the model, the value of 16.0 mm/hr was found to reduce about 10 % reduction of surface runoff. For this condition, the reduction effect of Sediment, T-N, and T-P loads were 87.2, 28.5, and 85.1 % respectively. The rice straw surface covering was effective for removing surface runoff dependent loads such as Sediment and T-P.
Keywords
Non-point source pollution; HSPF; Rice straw mulching; BMPs; Infiltration; Surface runoff;
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