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Journal of the Korean Society of Hazard Mitigation 2012;12(6):275-286.
Published online December 31, 2012.
하천제방의 비정상 침투해석을 위한 설계홍수파형 산정
서린, 윤광석
Estimation of Design Flood-Hydrograph for Unsteady Seepage Analysis Through River Levees
Lynn Seo, Kwang Seok Yoon
Abstract
Our objective is to compose design flood-hydrograph for analysis of unsteady seepage through river levees. Flood data in the study area, whose observations period are sufficiently long, were collected. Design water surface level and design flood of the study area were analyzed. The method that was introduced in design criteria guideline for river levee in Japan was modified and applied in this study for decision of design flood-hydrograph. For examination of applicability of composed flood-hydrograph, the relation of slope of falling limb and duration of flood-hydrograph was analyzed. It was estimated that flood duration in composed flood-hydrograph was longer than one of design flood-hydrograph, that represents duration of design flood-hydrograph can not take duration of real flood into account. Slope of falling limb of composed flood-hydrograph was more gradual than one of design flood-hydrograph in most study area. Although the results showed that the larger area of a basin accompanies the gentler slope, the pronounced correlation, which can be seen between basin area and flood duration, did not exist. The present study suggests that employing duration of composed flood-hydrograph and slope of falling limb of design flood-hydrograph is safer design when analyzing unsteady seepage through river levees. This study proposed a practical approach to estimate design flood-hydrograph using past flood data. This study applied the methodology to the study area in five river basins and identified the validation.
Key Words: Levee; Unsteady seepage analysis; Design flood-hydrograph; Water surface level
요지
본 연구는 제방에 대한 비정상 침투해석에 사용되는 설계홍수파형을 결정하기 위하여 수위자료가 충분히 구축된 우리나라 5대강 수계의 수위관측소 홍수자료를 수집하고 대상 지점의 유역면적, 제방고, 계획홍수량 및 계획홍수위를 조사하였다. 합성홍수파형 결정방법은 일본의 하천제방설계지침에서 제시하고 있는 방법을 보완하여 사용하였다. 합성된 홍수파형의 적용성을 검토하기 위해 합성홍수파형의 감수부 경사와 지속시간을 계획수문곡선과 비교하였고 유역면적에 따른 홍수파형의 감수부 경사와 지속시간의 관계도 분석하였다. 홍수지속시간은 합성홍수파의 홍수지속시간이 계획홍수파의 지속시간보다 크게 산정되었으며, 계획홍수파의 지속시간이 실제 홍수사상의 지속시간을 충분히 대변할 수 없는 것으로 나타났다. 감수부 경사는 대부분의 지점에서 합성홍수파형이 계획홍수파의 감수부 경사보다 완만한 것으로 나타났으며, 유역면적이 넓어질수록 완만해지는 경향을 보였으나, 지속시간과 같이 뚜렷한 상관관계는 보이지 않았다. 하천제방의 비정상 침투해석 시 지속시간은 합성홍수파의 지속시간을 사용하고 감수부 경사는 계획홍수파의 감수부 경사를 사용하는 것이 안전측 설계가 될 것으로 판단된다. 본 연구는 설계홍수수문곡선과 과거대표홍수사상을 이용하여 합성홍수파형을 작성하는 방법을 제안하였으며 5대강 수계 대상지점에 대해 적용하여 그 방법론의 타당성을 확인하였다.
핵심용어: 하천제방; 비정상 침투해석; 설계홍수파; 수위
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