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Journal of the Korean Society of Hazard Mitigation 2013;13(4):287-294.
Published online August 31, 2013.
SS 농도를 고려한 내성천 하류의 유사특성과 하상변동 예측
조창대, 윤종수, 이재운, 천세억
Sedimentation Characteristics and Prediction of Riverbed Variation of the Lower Naeseong Stream Considered SS Concentration
Chang Dae Jo, Jong Su Yoon, Jae Woon Lee, Se Uk Cheon
Abstract
This study was conducted with the national river, Naeseong stream which is typical alluvial river. In this paper, various sediment transport equations were used to predict and estimate long-term riverbed variation for downstream in Naeseong stream. Statistical variables such as RMSE(Root Mean Square error) and RMAE(Relative Mean Absolute Error) were used to evaluate reliability of HEC-RAS model. Also calculations of time-series of 91 river stations were reviewed. To confirm flow of suspended load of the Naeseong stream, We examined SS concentrations. As a results, SS flow was retained by maintaining over the certain concentration in dry season.
Key Words: Sediment transport formula; Riverbed variation; HEC-RAS model; SS concentration
요지
본 연구에서는 우리나라의 대표적인 충적하천인 내성천 하류를 대상으로 장기하상변동에 적합한 HEC-6 모형을 개선한 HEC-RAS 모형을 이용하여 유사이송 공식에 따른 장기하상변동을 예측 및 평가하였다. HEC-RAS 모형으로 모의한 결과를 평가하기 위하여 평균제곱근오차(Root mean square error, RMSE)와 상대평균절대오차(Relative mean absolute error, RMAE)의 통계적 변량을 사용하였으며, 또한 91개의 River Station 지점의 시계열 계산결과를 검토하였다. 내성천 유역의 부유사 흐름에 대한 확인을 위하여 SS 농도를 검토한 결과 유량이 적은 갈수기에도 일정량 이상의 농도를 유지함으로써 지속적인 유사이송이 진행되고 있음이 확인되었다.
핵심용어: 유사이송 공식; 하상변동; HEC-RAS 모형; SS 농도


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