Abstract
도시유역은 거리, 관망, 하천 등으로 구성되어 있지만 우수유출모형에서 하류 소유역은 하도추적을 통해 관망, 하천과 같은 수리학적 요소를 고려하고 있으나 상류 수원 소유역은 수리학적 요소를 고려하지 않고 단순하게 모의하고 있다. 본 연구에서는 도시유역내 수리학적 요소를 고려한 유하시간의 확률밀도함수로 순간단위도를 정의하는 UGMcIUH(Urban Grid geoMorpho-Climatic Instantaneous Unit Hydrograph)모형을 구축하고 온천천유역을 대상으로 적용성을 검토하였다. 사면, 거리, 관망, 하천 등을 통합한 지형표고모델을 이용하여 흐름경로를 산정하였고 홍수파(Kinematic Wave)이론을 적용하여 산정한 평균 홍수파의 유속을 이용하여 격자별 유하시간을 산정하였다. 도시유역내 수리요소는 유하시간과 수문학적응답특성 산정시 큰 영향을 미치는 것으로 분석되었다. Although urban area is composed of street, pipes and channels, hydraulic elements is included by hydraulic routing at downstream subcatchment in urban stormwater model but the hydraulic elements is ignored and frequently greatly simplified at upstream headwater subcatchment. In this study, we construct a UGMcIUH(Urban Grid based geoMorpho-Climatic Instantaneous Unit Hydrograph), which defines the IUH as the probability density function of the travel time including hydraulic elements in a urban area and evaluate the application for Onchun River. Flow paths are extracted from a spatially processed digital elevation model that incorporates hillslopes, pipes and channels, and travel times are computed in each grid using the average wave celerity from kinematic wave theory. Hydraulic elements in urban catchments has a significant role in determining the travel times and hydrologic response of the watershed.
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