농지배수 수문설계 기준과 임계지속기간을 고려한 농업 소유역 침수분석
Inundation Analysis of Agricultural Basin Considering Agricultural Drainage Hydrological Plan and Critical Rainfall Duration
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초록
KDS (Korean Design Standard) for agricultural drainage is a planning standard that helps determine the appropriate capacity and type of drainagefacilities. The objective of this study was to analyze the inundation of the agricultural basin considering the current design standard and the criticalrainfall duration. This study used the rainfall durations of 1-48 hour, and the time distribution method with the Chicago and the modified Huff model. For the runoff model, the NRCS (Natural Resources Conservation Service) unit hydrograph method was applied, and the inundation depth and durationwere analyzed using area-elevation data. From the inundation analysis using the modified Huff method with different rainfall durations, 4 hours showedthe largest peak discharge, and 11 hours showed the largest inundation depth. From the comparison analysis with the current method (Chicago methodwith a duration of 48 hours) and the modified Huff method applying critical rainfall duration, the current method showed less peak discharge and lowerinundation depth compared to the modified Huff method. From the simulation of changing values of drainage rate, the duration of 11 hours showedlarger inundation depth and duration compared to the duration of 4 hours. Accordingly, the modified Huff method with the critical rainfall durationwould likely be a safer design than the current method. Also, a process of choosing a design hydrograph considering the inundation depth and durationis needed to apply the critical rainfall duration. This study is expected to be helpful for the theoretical basis of the agricultural drainage design standards.
Abstract
KDS (Korean Design Standard) for agricultural drainage is a planning standard that helps determine the appropriate capacity and type of drainagefacilities. The objective of this study was to analyze the inundation of the agricultural basin considering the current design standard and the criticalrainfall duration. This study used the rainfall durations of 1-48 hour, and the time distribution method with the Chicago and the modified Huff model. For the runoff model, the NRCS (Natural Resources Conservation Service) unit hydrograph method was applied, and the inundation depth and durationwere analyzed using area-elevation data. From the inundation analysis using the modified Huff method with different rainfall durations, 4 hours showedthe largest peak discharge, and 11 hours showed the largest inundation depth. From the comparison analysis with the current method (Chicago methodwith a duration of 48 hours) and the modified Huff method applying critical rainfall duration, the current method showed less peak discharge and lowerinundation depth compared to the modified Huff method. From the simulation of changing values of drainage rate, the duration of 11 hours showedlarger inundation depth and duration compared to the duration of 4 hours. Accordingly, the modified Huff method with the critical rainfall durationwould likely be a safer design than the current method. Also, a process of choosing a design hydrograph considering the inundation depth and durationis needed to apply the critical rainfall duration. This study is expected to be helpful for the theoretical basis of the agricultural drainage design standards.
참고문헌 (18)
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