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논문 기본 정보

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학술저널
저자정보
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한국지형학회 한국지형학회지 한국지형학회지 제27권 제1호
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2020.1
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A river bed which is submerged in water at high flow and becomes part of the river at low flow, serves as a bridge between the river and the land. The channel bar creates a unique ecosystem with vegetation adapted to the particular environment and the water pool forms a wetland that plays a very important role in the environment. To evaluate anthropogenic impacts on the river bed in the Middle Yeongsangang River, the fluvial landforms in the stream channel were analyzed using multi-temporal remotely-sensed images. In the aerial photograph of 2005 taken before the construction of the large weirs, oxbow lakes, mid-channel bars, point bars, and natural wetlands between the artificial levees were identified. Multiple bars divided the flow of stream water to cause the braided pattern in a particular section. After the construction of the Seungchon weir, aerial photographs of 2013 and 2015 revealed that most of the fluvial landforms disappeared due to the dredging of its riverbed and water level control(maintenance at 7.5El.m). Sentinel-2 images were analyzed to identify differences between before and after the opening of weir gate. Change detection was performed with the near infrared and shortwave infrared spectral bands to effectively distinguish water surfaces from land. As a result, water surface area of the main stream of the Yeongsangang River decreased by 40% from 1.144km2 to 0.692km2. A large mid-channel bar that has been deposited upstream of the weir was exposed during low water levels, which shows the obvious influence of weir on the river bed. Newly formed unvegetated point bars that were deposited on the inside of a meander bend were identified from the remotely sensed images. As the maintenance period of the weir gate opening was extended, various habitats were created by creating pools and riffles around the channel bars. Considering the ecological and hydrological functions of the river bed, it is expected that the increase in bar areas through weir gate opening will reduce the artificial interference effect of the weir.
#Yeongsan River #riverbed landforms #weir operation #remote sensing image analysis

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참고문헌 (32)

참고문헌 신청
Best, J. L / 1988 / Sediment transport and bed morphology at river channel confluences / Sedimentology 35(3):481~498 google schola Church, M / 2006 / Bed material transport and the morphology of alluvial river channels / Annual Review of Earth and Planetary Sciences 34(1):325~354 google schola Committee on Missouri River Recovery and AssociatedSediment Management Issues / 2011 / Missouri River Planning: Recognizing and Incorporating Sediment Management / National Research Council of the National Academies google schola Graf, W. L / 2006 / Downstream hydrologic and geomorphic effects of large dams on American rivers / Geomorphology 79(3-4):336~360 google schola 홍기병 / 2009 / 다중시기 영상자료를 이용한 금강하류의 하중도 퇴적환경 변화 / 환경영향평가 18(3):171~183 dbpia

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