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NTIS 바로가기Journal of Korea Water Resources Association = 한국수자원학회논문집, v.48 no.9, 2015년, pp.743 - 756
안정민 (국립환경과학원 낙동강물롼경연구소) , 곽성현 (창원대학교 토목공학과) , 류시완 (창원대학교 토목공학과)
효과적인 하천관리를 위해서는 준설과 각종 수리구조물의 영향에 의한 하상변화 양상을 파악하고 평가하는 것이 필수적이다. 특히 대규모 준설과 대형수리구조물의 건설은 본류뿐만 아니라 지류의 하상안정에도 영향을 미칠 수 있다. 본 연구에서는 금호강이 유입하는 낙동강 강정고령보~달성보 구간에 대해 하도준설과 보 건설 및 운영에 따른 본류와 지류에서의 장기하상변동 영향을 살펴보고자 하였다. HEC-6모형을 이용하여 유사이송 및 장기하상변동 양상을 모의하였으며, 그 결과 준설 및 보 운영으로 인해 본류뿐만 아니라 지류에서도 하상변화량이 증가하고 가속화되었다.
It is necessary to evaluate the effect of dredging and weir operation on the flow and long-term bed change for river management. Especially, large scale river treatment project, with dredging or weir installation and operation, can increase the instability of riverbed in tributaries as well as mains...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
하상변동은 어떤 요인으로 인해 발생하는가? | 하천은 장기간에 걸쳐 세굴과 퇴적을 반복하여 유사공급과 유송률이 같아져 안정하도를 이룬다. 하상변동은 산사태나 홍수 등 자연적인 요인뿐만 아니라 댐, 보 그리고 교량과 같은 수리시설물의 설치, 준설 등 인위적인 요인으로 인해 발생한다. 최근 낙동강은 4대강살리기 사업으로 인해 하도가 준설되고 8개 다기능보가 설치되어 하천환경이 크게 변화하였다. | |
유역의 유출유사량에 영향을 미치는 인자에는 무엇이 있는가? | 특히 다기능보 상류에서 저수지의 형성은 하천의 흐름을 변화시켜 보 상·하류의 유사거동에 많은 영향을 미치게 되었다. 저수지로의 유입 유사량은 상류유역으로 부터의 유출 유사량에 영향을 받으며 유역의 유출유사량에 영향을 미치는 인자는 지류유출, 유사의 입경, 경사, 지형, 유출, 하도의 수리학적 특성 등이 있다(Strand and Pemberton, 1982). 하도내 다기능보 설치에 따른 흐름 차단과 저류효과는 유사를 포착하고 유속을 감소시켜 유사의 퇴적을 유도하고 이는 하류에 유사공급을 차단하여 하류에서 세굴현상을 발생시킨다. | |
우리나라의 대표적인 하천의 하상변동에 관한 주요 연구로 무엇이 있는가? | (2009)은 미국 Mississippi강 하류에 HEC-RAS의 하상변동모형을 적용하였으며 최적의 유사량공식으로 En gelund and Hansen 공식을 제안하였다. 우리나라의 하상변동에 관한 연구는 대표적으로 Ceon and Kim(2009)은 인위적인 골재채취가 없다는 가정 하에 섬진강하류를 대상으로 하상의 변동 특성을 분석하고 장기하상변동을 예측하였고, Ahn et al. (2010; 2012)은 형산강을 대상으로 다년간 수치모의에 필요한 자료를 관측하고 HEC-6 및 GSTARS 모형에 적용하여 형산강유역 하상변동 분석에 적합한 유사량공식을 제안하였다. Kim and Shin (2013)은 HEC-RAS를 이용하여 부유사 및 하상토입도분포를 고려한 저수지 퇴사의 장기모의를 수행하여 저수지의 특정위치에서 특정시기에 어떤 입도의 유사가주로 퇴적되는지를 합리적으로 예측한 바 있다. |
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