인위적인 보 수위조절로 인한 영산강 하도 지형 변화
Changes in the Riverbed Landforms Due to the Artificial Regulation of Water Level in the Yeongsan River
2
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
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.
Abstract
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.
참고문헌 (32)
- Best, J. L, "Sediment transport and bed morphology at river channel confluences", Sedimentology, 35(3), pp.481~498 (1988)
- Church, M, "Bed material transport and the morphology of alluvial river channels", Annual Review of Earth and Planetary Sciences, 34(1), pp.325~354 (2006)
- Committee on Missouri River Recovery and AssociatedSediment Management Issues, "Missouri River Planning: Recognizing and Incorporating Sediment Management" (2011), National Research Council of the National Academies
- Graf, W. L, "Downstream hydrologic and geomorphic effects of large dams on American rivers", Geomorphology, 79(3-4), pp.336~360 (2006)
- 홍기병, "다중시기 영상자료를 이용한 금강하류의 하중도 퇴적환경 변화", 환경영향평가, 18(3), pp.171~183 (2009), 한국환경영향평가학회
- Hooke, J. M, "The significance of mid-channel bars in an active meandering river", Sedimentology, 33(6), pp.839~850 (1986)
- Hooke, J. M, "Channel bar dynamics on multi-decadal timescales in an active meandering river", Earth Surface Processes and Landforms, 36(14), pp.1910~1928 (2011)
- Report on Comprehensive Control Planning of the Yeongsan River Basin, "Iksan Regional Construction and Management Administration", Ministry of Land, Transport and Maritime Affairs, ~ (2005)
- Jang, C. L, "Numerical simulation of geomorphic changes in the river after opening of gates in Sejong Weir", Proceedings of the Korea Water Resources Association Conference, pp.240~244 (2019)
- Jensen, J. R, "Remote sensing of the environment: an earth resource perspective", Pearson Prentice Hall
- 김장수, "하구둑 건설 후의 금강하류 유역의 하도내 퇴적환경 연구", 한국지형학회지, 16(1), pp.1~15 (2009), 한국지형학회
- Kim, J. W, "Fundamentals of geomorphology" (2019), SNU Press
- 김재엽, "다중시기 위성영상을 이용한 생태하천복원지역의 지표특성 분석 - 태화강을 대상으로 -", 한국지형학회지, 22(1), pp.63~73 (2015), 한국지형학회[DOI]
- 김경탁, "식생지수와 가뭄지수의 상관성 분석", 한국습지학회지, 8(1), pp.49~58 (2006), 한국습지학회
- Kim, S. W, "Proceedings on the Korean Society for Geo-Spatial Information System", Proceedings on the Korean Society for Geo-Spatial Information System (, pp.170~175 (2003)
- 김예슬, "식생 모니터링을 위한 다중 위성영상의 시공간 융합 모델 비교", 대한원격탐사학회지, 35(6), pp.1209~1219 (2019), 대한원격탐사학회[DOI]
- Kim, Y. K, "Study on plant life form and replacement wetlands vegetation through vegetation assessment of Youngsan River", Doctor, Department of Ecology Landscape Architecture Design, pp.2014
- Lee, J. W, "An Analysis of the Effect of Damming on Flow Duration Characteristics of Five Major Rivers in Korea", Journal of the Korean Society of Civil Engineers, 13(3), pp.79~91 (1993)
- 이경수, "보 상류 교호사주의 거동에 따른 하류 지형변화에 대한 실험적 분석", 한국수자원학회 논문집, 52, pp.801~810 (2019), 한국수자원학회[DOI]
- Ministry of Agriculture, Food and Rural Affairs, "Statistical yearbook of land and water development for agriculture 2017" (2018), Ministry of Agriculture, Food and Rural Affairs·Korea Rural Community Corporation
- Ministry of Environment UNDP, "2008 National inland wetland survey", pp.2009, GEF Korea Wetland Project
- Shields Jr., F. D, "Reservoir effects on downstream river channel migration", Environmental Conservation, 27(1), pp.54~66 (2000)
- Simon, A, "Gradation processes and channel evolution in modified West Tennessee streams: process, response, and form" (1994), US Government Printing Office Denver, CO
- 손명원, "보 건설이 자갈하상 지형 발달에 미치는 영향", 한국지역지리학회지, 24(2), pp.255~266 (2018), 한국지역지리학회[DOI]
- The Four Major Rivers Restoration Project Headquarters, "Master Plan of the Four Major Rivers Restoration", pp.61~ (2009), Ministry of Land, Transport and Maritime Affairs
- Watershed Management Committee of Yeongsan River and Seomjin River, "Efficiency evaluations of fish passage and the management strategies" (2014), Ministry of Environment
- "National Geographic Information Institute"[URL]
- "Water Environment Information System"[URL]
- "WAMIS(Water Resources Management Information System)"[URL]
- "ESA Sentinel"[URL]
- "Land Viewer"[URL]
- "Korea Water Resources Corporation MyWater site"[URL]