Study on Damage Reduction by Flood Inundation and the Sediments by SWAT and HEC-RAS Modeling of Flow Dynamics with Watershed Hydrology - For 27 July 2011 Heavy Storm Event at GonjiamCheon Watershed -

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2012 Vol.54, Issue 2 Preview Page Next Page

Study on Damage Reduction by Flood Inundation and the Sediments by SWAT and HEC-RAS Modeling of Flow Dynamics with Watershed Hydrology - For 27 July 2011 Heavy Storm Event at GonjiamCheon Watershed - SWAT 및 HEC-RAS 모형의 수문-수리 연계모델링을 통한 곤지암천 유역의 하천범람 및 토사유출 피해저감 연구 - 2011년 7월 27일 국지성 폭우를 대상으로 -: 정충길, 조형경, 유영석, 박종윤, 김성준
Jung Chung Gil, Joh Hyung Kyung, Yu Yeong Seok, Park Jong Yoon, Kim Seong Joon

2012. pp. 87–94

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Abstract

This study is to evaluate flood inundation and to recommend measures of damage reduction on sediment by concentrated torrential rainfall at Gonjiamcheon Watershed (183.4 km²). Firstly, the SWAT (Soil and Water Assessment Tool) was simulated streamflow and sediment at upstream. Then, we produced a map of floodplain boundary by using HEC-RAS (Hydrologic Engineering Centers River Analysis System) at downstream. The SWAT model was calibrated with 2 years (2008～2009) daily streamflow and validated for another years (2010～2011. 7. 31). The SWAT model was simulated with 3 years (2008～2010) by monthly water quality (Sediment) at Gonjiamcheon water quality station. The streamflow and sediment from SWAT model were input as boundary conditions to HEC-RAS. The results of HEC-RAS indicated that mapping of floodplain boundary was Jiwol and Jiwol 2 district. Additionally, inundation area and depth were assessed and applied BMPs scenario for managing the sediment yield.

Keywords

비점오염원

SWAT

HEC-RAS

토사유출

하천범람

BMPs

SWAT-CUP

Streambank stabuluzation

Porus gully plug

References

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