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내성천 하도 내 식생활착에 의한 단면 및 유량변화 분석

Analysis of changes in cross section and flow rate due to vegetation establishment in Naeseong stream

  • Lee, Tae Hee (Hydrological Survey Department, Korea Institute of Hydrological Survey) ;
  • Kim, Su Hong (Hydrological Survey Department, Korea Institute of Hydrological Survey)
  • 투고 : 2020.12.30
  • 심사 : 2021.02.05
  • 발행 : 2021.03.31

초록

본 연구에서는 유역내 댐 건설과 하천내 식생성장으로 육역화 현상이 진행되는 내성천 환경 변화의 원인을 파악하기 위해 내성천 유역에 위치한 3개 관측소를 대상으로 2010년부터 2019년까지 관측된 수문자료와 항공사진 및 지형자료를 수집하여 수문특성에 따른 수위-유량관계 변화 및 횡단면의 침식·퇴적 변화율을 분석하였다. 또한 상류 지류인 월호교 관측소에서 인위적인 유량 조절 유무에 따른 영향을 비교하였다. 분석결과, 내청천에서는 2013년부터 2015년까지 지속적인 가뭄에 의해 홍수터에서는 식생활착 및 식생사주 면적 증가로 육역화가 진행되었고, 저수위에서는 흐름부 축소, 유속 및 하상소류력 증가로 지속적인 하상침식이 발생한 것으로 판단되었다.

In the present study, hydrologic data and topographical data from 2010 to 2019 were collected from three gauging stations placed in the watershed of Naeseong stream to determine changes and rates of changes in rainfall, water level & mean velocity, and water level & discharge, together with changes in rates of erosion and deposition at cross-sections of the river. Besides, effects of regulated and non-regulated rivers according to the presence of artificial regulation of flow rate of the river via artificial structure located at Seo stream (Yeongju si (Wolhogyo) station), the tributary free from construction of dams, were compared and analyzed. Results of analyses conducted in the present study revealed vegetational establishment and landforming due to increasing area of vegetational sandbar evolved in the flood plain (intermediate- or high- water level) by the drought sustained from 2013 to 2015. Continuous erosion of river bed was appeared because of narrowed flow area with low water level and increased velocity and tractive force on river bed.

키워드

참고문헌

  1. Choi, S.U., Yoon, B.M., Woo, H., and Cho, K.H. (2004). "Effect of flow-regime change due to damming on the river morphology and vegetation cover in the downstream river reach: A case of Hapchon dam on the Hwang River." Journal of Korea Water Resources Association, Vol. 37, No. 1, pp. 55-66. (in Korean) https://doi.org/10.3741/JKWRA.2004.37.1.055
  2. Gordon, E., and Meentemeyer, R.K. (2006). "Effects of dam operation and land use on stream channel morphology and riparian vegetation." Geomorphology, Vol. 82, pp. 412-429. https://doi.org/10.1016/j.geomorph.2006.06.001
  3. Graf, W.L. (2006). "Downstream hydrologic and geomorphic effects of large dams on American rivers." Geomorphology, Vol. 79, pp. 336-360. https://doi.org/10.1016/j.geomorph.2006.06.022
  4. Kakao (2019). Kakaomap (2010-2019).
  5. Kim, W., and Kim, S. (2019). "Analysis of the riparian vegetation expansion in middle size rivers in Korea." Journal of Korea Water Resources Association, Vol. 52, No. S-2, pp. 875-885. (in Korean)
  6. Lee, C., Kim, D.G., Hwang, S.Y., Kim, Y., Jeong, S., Kim, S., and Cho, H. (2019a). "Dataset of long-term investigation on change in hydrology, channel morphology, landscape and vegetation along the Naeseong stream (II)." Ecology and Resilient Infrastructure, Vol 6, No. 1, pp. 34-48. (in Korean)
  7. Lee, C., Kim, D.G., Ji, U. and Kim, Ji. (2019b). "Dataset of long-term monitoring on the change in hydrology, channel morphology, landscape and vegetation along the Naeseong stream (I)." Ecology and Resilient Infrastructure, Vol 6, No. 1, pp. 23-33. (in Korean)
  8. Lee, G.R., Cho, Y.D., Kim, D.S., Kim, J.S., Jeong, W.H., Cho, H.J. and Yun, K.H. (2010). "A study on geomorphic environments and sediments of channels at Naeseongcheon river in Gyeongpook province." Journal of Korea Association of Regional Geographers, Vol. 16, No. 2, pp. 85-99. (in Korean)
  9. Ministry of Land, Infrastructure and Transport (MOLIT) (2016). Water resources long-term comprehensive plan (2001-2020). (in Korean)
  10. National Geographic Information Institute (NGII) (2019). Aerial photography (2010-2019).
  11. VanLooy, J.A., and Martin, C.W. (2005). "Channel and vegetation change on the Cimarron River, Southwestern Kansa, 1953-2001." Annals of the Association of american Geographers, Vol. 95, No. 4, pp. 727-739. https://doi.org/10.1111/j.1467-8306.2005.00483.x
  12. Williams, G.P., and Wolman, M.G. (1984). Downstream effects of dams on alluvial channels. USGS Professional Paper 1286, Department of the Interior, U.S.
  13. Woo, H. (2008). "White river? green river?" Magazine of Korea Water Resources Association, Vol. 41, No. 12, pp. 38-47. (in Korean)