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Journal of the Korean Society of Hazard Mitigation 2012;12(5):215-224.
Published online October 31, 2012.
침투능 시험에 의한 홍천강 유역의 침투곡선식 산정
강영복, 김봉진, 박수진, 최한규
Estimation of Infiltration Curved Formulas by using Infiltration Capacity Experiment in the Hongcheun-River Watershed
Young Bok Kang, Bong Jin Kim, Soo Jin Park, Han Kuy Choi
Abstract
This study provided the value of infiltration capacity by soils after taking experiments of initial infiltration capacity on 29 sites from 18 soil series that were selected from the area of Hongcheon River. According to the result of our study, there is no significant difference between the field and the paddy in terms of initial infiltration capacity, but there is a huge difference between woods and the earth. Then, we suggested a curve formula of infiltration capacity on soil series that have a high defining coefficient based on the data from our study. In the end, we compared effective precipitation by methods of measuring it. The result of this comparison suggested that water is spilled intensively in the latter half of raining when Horton`s method is used, and water is spilled from the beginning and is spilled more in the latter half when NRCS is used. The value of effective precipitation was calculated less when Horton`s infiltration capacity curve formula was used than when NRCS`s AMC-II conditions were applied.
Key Words: Effective rainfall; Soil series; Infiltration capacity; Infiltration curved formulas
요지
본 연구는 홍천강 유역을 대상으로 유역을 대표 할 수 있는 18개의 토양통을 선정하고 29개 지점에 대하여 침투능시험을 시행하여 토지현황별 침투능 값을 제시하였다. 산정 값을 보면 전과 답의 경우 초기와 종기침투능에서 큰 차이를 보이지 않았으나 임야와 대지에서는 큰 차이를 보이는 것으로 관찰되었다. 다음으로 실측자료를 토대로 하여 결정계수가 높은 토양통에 대한 침투곡선식을 제안하였다. 끝으로 유효우량 산정방법별 유효우량을 비교 하였다. 비교 결과 Horton의 방법이 강우 후반부에 집중 유출형태를 보이고 있으며, NRCS의 경우 강우 초기부터 유출의 형태를 보이다가 후반 부에 증가하는 것으로 관찰되었다. 유효우량 산정 값의 경우 Horton의 침투능 곡선식이 NRCS의 AMC-II 조건보다 작게 산정되었다.
핵심용어: 유효우량; 토양통; 침투능; 침투 곡선식
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