침투량 산정 방법에 따른 유역유출 연속모의의 정확성 평가 = Evaluation of Accuracy for Watershed Runoff Continuous Simulation by Infiltration Methods

다국어 초록 (Multilingual Abstract)

Infiltration separate precipitation into overland flow and the portion penetrating from the ground surface into the soil. Thus, infiltration is an important component of a hydrologic model. A proper infiltration method may increase accuracy of watershed runoff simulation. The purpose of the study is to compare watershed runoff simulation results by the NRCS (U.S. Natural Resources Conservation Service) method with those by the Green-Ampt equation. The NRCS method is empirically derived from land cover conditions and soil types of the USA, whereas the Green-Ampt equation is derived from physical law of groundwater flow. The SWMM (storm water management model) is used to evaluate the results by the two infiltration methods. We conducted watershed runoff continuous simulations, and calibrated the model automatically for objective comparison. Watershed runoff simulation results by the Green-Ampt equation is more accurate in runoff volume and peak flow than those by the NRCS method. The study results have significance to evaluate applicability of the Green-Ampt equation that is rarely used in Korea, and to suggest an application method.

국문 초록 (Abstract)

강수는 침투에 의하여 지표류와 땅속으로 스며드는 부분으로 분리되므로 침투는 수문 모형의 중요 성분이다. 따라서 적절한 침투량 산정 방법을 사용하면 유역유출 모의의 정확성을 높일 수 있다. 본 연구에서는 미국의 토지 피복 상태와 토양의 종류에 따라 경험적으로 개발된 NRCS 방법과 토양 내 지하수 흐름의 물리적인 법칙에 의해 유도된 Green-Ampt 식에 의한 유역유출 해석 결과를 비교하였다. 두 방법에 의한 유출해석 결과를 비교하기 위해 SWMM으로 유역유출 연속모의를 수행하였고, 계산된 결과의 객관적인 비교를 위해 자동 보정을 수행하였다. 그 결과, Green-Ampt 식에 의한 유역유출해석 결과가 NRCS 방법에 의한 결과보다 유출체적과 첨두유량 측면에서 관측값을 보다 잘 모사하는 것으로 분석되었다. 본 연구의 결과는 우리나라에서 활용빈도가 적은 Green-Ampt 식의 적용 가능성을 평가하고, 적용 방법을 제시한 것에 의의가 있다.

참고문헌 (Reference)

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