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Short-term Change in Channel Morphology of the Naeseong Stream before the Operation of Yeongju Dam, Korea

영주댐 운영 전 내성천에서 하도 형태의 단기 변화

  • Lee, Chanjoo (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Donggu (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 이찬주 (한국건설기술연구원 수자원하천연구소) ;
  • 김동구 (한국건설기술연구원 수자원하천연구소)
  • Received : 2017.04.03
  • Accepted : 2017.04.04
  • Published : 2017.03.31

Abstract

The Naeseong Stream is a meandering sand-bed stream flowing through mountains and has so long maintained its geomorphological uniqueness characterized by extensive braided bare bars. Recently, its long-lasting landscape has been changed due to encroachment of vegetation. In this study being a part of long-term monitoring research morphological changes of the 56.8 km long study reach of the Naeseong Stream, which occurred during the period of 2012 - 2016 were analyzed. Airborne LiDAR and terrestrial cross-section surveys were carried out. Hydrological and on-site investigation data were also collected. Among the main four sites, two bend reaches showed point bars enlarged, while along the other two straight reaches mid-channel bars were either newly formed or increased in area and height. At the highest deposition point of each bar, vertical changes which were caused by one or two times of sediment deposition amounted to 0.6 - 1.4 m. On the contrary channel bed degradation was not obvious. Overall morphological changes in the study reach were attributed to deposition of sediment which occurred during the flood in July 2016 on the bar surfaces vegetated during the precedent dry seasons. These kind of geomorphological processes are thought to be the same as those related to the existing mid-channel islands along the mid- and downstream reach of the Naeseong Stream.

내성천은 산지를 사행하는 모래하천으로 오랫동안 그 하천지형학적 특성을 유지해왔다. 그러나 최근 식생의 활착으로 종래의 경관을 상실해 가고 있다. 본 연구에서는 내성천 장기조사 연구의 일환으로 내성천의 56.8 km 구간을 대상으로 지난 2012 - 2016년 기간에 발생한 지형변화를 분석하였다. 항공 라이다 및 하천측량이 시행되었고 수문자료와 현장 조사자료가 함께 활용되었다. 주요 4개 지점중에서 만곡부 지점에서는 만곡사주가 확장되었고, 직선구간에서는 하중 사주가 발달하였다. 한 두 번의 유사 퇴적으로 인해 발생한 하중 사주의 고도 변화는 0.6 - 1.4 m에 달하였으나 하상저하는 분명하지 않았다. 이러한 변화는 2014 - 2015년의 갈수기에 식생이 크게 활착하였다가 2016년에 홍수로 인해 퇴적이 일어난데 기인하는 것으로 보인다. 이러한 과정은 이전에 내성천 중하류 구간에 형성되어 있는 하중도의 주된 형성과정으로 판단된다.

Keywords

References

  1. Burvingt, O., Masselink, G., Russell, P. and Scott, T. 2016. Beach response to consecutive extreme storms using LiDAR along the SW coast of England. Journal of Coastal Research: Special Issue 75: 1052-1056. https://doi.org/10.2112/SI75-211.1
  2. De Rose, R.C. and Bashera, L.R. 2011. Measurement of river bank and cliff erosion from sequential LIDAR and historical aerial photography. Geomorphology 126: 132-147. https://doi.org/10.1016/j.geomorph.2010.10.037
  3. Gordon, E. and Meentemeyer, R.K. 2006. Effect of dam operation and land use on stream channel morphology and riparian vegetation. Geomorphology 82: 412-429. https://doi.org/10.1016/j.geomorph.2006.06.001
  4. Han, J.H., Kwon, J.H. and Hong, C.K. 2010. Analysis of network-RTK (VRS) positioning accuracy for surveying public control point. Journal of Korean Society for GeoSpatial Information Science 18: 13-20. (in Korean)
  5. Hickin, E. 1984. Vegetation and river channel dynamics. Canadian Geographer 28: 111-124. https://doi.org/10.1111/j.1541-0064.1984.tb00779.x
  6. JGGK. 1920. Survey on Flood Control and Water Use. The Japanese Government General of Korea, Seoul, Korea. (in Japanese)
  7. KICT. 2016. Analysis of Change in River Morphology and Vegetation Due to Artificial Structures. KICT Report 2016-187, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea. (in Korean)
  8. Kim, D-S. 2003. Application of airborne laser mapping system, LiDAR, and GPS technologies. Korean National Committee on Irrigation and Drainage 10: 103-111. (in Korean)
  9. Kim, H.I., Yu, G.S., Park, K.D. and Ha, J.H. 2008. Accuracy evaluation of VRS RTK surveys inside the GPS CORS network operated by National Geographic Information Institute. Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography 26: 139-147. (in Korean)
  10. Lee, C., Kim, J.S., Kim, K.H. and Shin, H.S. 2015, Analysis on fluvial geomorphological characteristics based on past and present data for river restoration: An application to the Miho River and the Naesung River. Journal of Korea Water Resources Association 48: 169-183. (in Korean) https://doi.org/10.3741/JKWRA.2015.48.3.169
  11. Lee, G.R. 2010. A comparative analysis on channel forms and landscapes at Naeseongcheon River and Wicheon River in Gyeongpook Province. Journal of the Korean Geomorpholgical Association 17: 1-16. (in Korean)
  12. Matzek, C.D., Ely, L.L. and O'Connor, J.E. 2012. Using repeat LiDAR surveys to determine the geomorphic changes related the removal of the Marmot Dam on the sandy river, Oregon. American Geophysical Union, Fall Meeting 2012, abstract #EP13E-0895.
  13. MLTM. 2013. Basic Plan for the Downstream of the Naesung River. Ministry of Land, Maritime and Transportation, Sejong, Korea. (in Korean)
  14. Nanson G.C. and Beach, H.F. 1977. Forest succession and sedimentation on a meandering-river floodplain, northeast British Colombia, Canada. Journal of Biogeography 4: 229-251. https://doi.org/10.2307/3038059
  15. Park, B.J., Jang, C.L., Lee, S.H. and Jung, K.S. 2008. A study on the sandbar and vegetation area alteration at the downstream of dam. Journal of Korea Water Resources Association 41: 1163-1172. (in Korean) https://doi.org/10.3741/JKWRA.2008.41.12.1163
  16. Richards, K. 1982. Rivers: Form and Processes in Alluvial Channels. Methuen, London, UK.
  17. Williams, G.P. and Wolman, M.G. 1984 Downstream Effects of Dams on Alluvial Channels. USGS Professional Paper 1286, Department of the Interior, USA.
  18. Wintenberger, C.L., Rodrigues, S., Breheret J-G. and Villar, M. 2015. Fluvial islands: First stage of development from nonmigrating (forced) bars and woody-vegetation interactions. Geomorphology 246: 305-320. https://doi.org/10.1016/j.geomorph.2015.06.026
  19. Woo, H., Park, M., Cho, K-H., Cho, H. and Chung, S. 2010. Recruitment and succession of riparian vegetation in alluvial river regulated by upstream dams - Focused on the Nakdong River downstream Andong and Imha Dams -. Journal of Korea Water Resources Association 43: 455-469. (in Korean) https://doi.org/10.3741/JKWRA.2010.43.5.455

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