Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Hydraulic Analysis and Assessment Models for the Restoration of Ecological Connectivity in Floodplains Isolated by Levees

하천 제방에 의하여 차단된 홍수터에서 생태적 연결성 회복을 위한 수리분석 및 평가모형 개발

  • Received : 2016.12.09
  • Accepted : 2016.12.20
  • Published : 2016.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

River restoration has recently been performed not only for the improvement of the artificial parts in the past but also for the restoration of abandoned river reaches which were blocked and isolated. For the restoration of abandoned river reaches, it is important to recover the hydraulic and ecological connectivity in the isolated space by longitudinal structures like levees. But because the assessment tools to determine whether the river restoration is performed properly are so rare at present, we aim to provide a tool for assessing ecological connectivity in a target river in this study. In the first step, one-dimensional numerical model for rainfall-runoff and channel routing was developed and then applied to the watershed of the Cheongmi Stream. In this step, a numerical model was developed to assess the restoration of connectivity. The model consists of two parts: one part is to convert the results of one-dimensional channel routing into two-dimensional spatial distribution. The other is to calculate the habitat suitability index according to time steps by using two-dimensional hydraulic features. The model was applied to a restoration area of the Cheongmi Stream. The advantage of this study is that two-dimensional hydraulic analysis can be easily obtained from one-dimensional hydraulic analysis without a complex and time-consuming two-dimensional analysis. HHS (Hydraulic Habitat Suitablility) by sections of target reaches and target species can be easily obtained using the results of this study.

최근 하천복원 사업은 과거 인공적인 부분을 개선하는 범위를 벗어나 격리차단된 구하도까지 복원하는 수준에 이르렀다. 구하도 복원은 하천 제방과 같은 종적 구조물에 의해 차단된 공간의 수리적 연결성 회복이 중요하다. 그러나 하천복원이 적절히 수행되었는지 관한 평가방법이 부족한 상황이기에 본 연구에서는 대상하천에서의 생태적 연결성 평가를 위한 수단을 제공하고자 한다. 이 연구에서 강우에 의한 유역유출 및 하도흐름 해석이 동시에 가능한 1차원 수치모형을 개발하여 청미천 유역에 적용한 바 있다. 특히 이 연구에서 1차원의 홍수추적 결과를 2차원의 공간분포로 변환시키고 시간에 따른 2차원의 수리특성으로부터 서식처적합도까지 산출하여 연결성 회복정도를 평가하는 수치모형을 개발하였으며, 이를 청미천 구하도 복원지역에 적용하였다. 복잡할 뿐만아니라 시간도 많이 소요되는 2차원의 분석을 수행하지 않고서도 1차원 수리특성 결과를 확장해서 2차원 수리특성을 쉽게 구할 수 있도록 한 것이 본 연구의 특징이다. 본 연구의 결과를 이용하면 구간별 대상종별 서식처적합도를 용이하게 산정할 수 있다.

Keywords

References

  1. Baek, K.O. and Kim, C.H. 2015. Test of a physical habitat model for stream restoration: a case study on midstream of Anyang-Cheon. Journal of Korean Society on Water Environment 31(1): 35-41. (in Korean) https://doi.org/10.15681/KSWE.2015.31.1.35
  2. Cha, J.H., Kim, C.W., and Cho, Y.S. 2014. Development and application of isovel distribution in velocity profile method using Poisson equation. Journal of Korean Society of Hazard Mitigation 14(6): 325-336. (in Korean) https://doi.org/10.9798/KOSHAM.2014.14.6.325
  3. Chiu, C-L. 1987. Entropy and probability concepts in Hydraulics. Journal of Hydraulic Engineering, ASCE 113(5): 583-599. https://doi.org/10.1061/(ASCE)0733-9429(1987)113:5(583)
  4. Chiu, C-L. 1988. Entropy and 2-D velocity distribution in open channels. Journal of Hydraulic Engineering, ASCE 114(10): 738-756 https://doi.org/10.1061/(ASCE)0733-9429(1988)114:7(738)
  5. Chiu, C.-L. and Said, C.A.A. 1995. Maximum and mean velocities and entropy in open-channel flow. Journal of Hydraulic Engineering 121(1): 26-35. https://doi.org/10.1061/(ASCE)0733-9429(1995)121:1(26)
  6. Ickes, B.S., Vallazza, J., Kalas, J., and Knights, B. 2005. River Floodplain Connectivity and Lateral Fish Passage: A Literature Review. U.S. Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin, USA.
  7. Kang, H.S. 2010. The Study on Estimate Method of Physical Fish Habitat Suitability Index. Korea Environment Institute. (in Korean)
  8. Kang, H.S. 2012. Comparison of physical habitat suitability index for fishes in the rivers of Han and Geum River watersheds. Journal of the Korean Society of Civil Engineers 32: 71-78. (in Korean)
  9. Kim, J.S. and Kim, K.H. 2015. Sustainable river restoration through enlarging river space. Magazine of Korea Water Resources Association 48(4): 39-44. (in Korean)
  10. Kim, S.H., Cheon, H.T., and Cho, K.H. 2015. Fish community structure of the former channel isolated by channelization in the Mangyeong River, Korea: Implications for connectivity restoration. Ecology and Resilient Infrastructure 2(2): 22-32. (in Korean) https://doi.org/10.17820/eri.2015.2.1.022
  11. Kim, S.H., Kim, D.N., and Cho, K.H. 2015. Evaluation of habitat improvement using two-dimensional fish habitat modeling after the connectivity restoration in an isolated former channel. Ecology and Resilient Infrastructure 2(2): 137-146. https://doi.org/10.17820/eri.2015.2.2.137
  12. Kim, S.K. and Choi, S.U. 2015. Simulation of change in physical habitat of fish using the mobile bed model in a downstream river of dam. Ecology and Resilient Infrastructure 2(4): 317-323. (in Korean) https://doi.org/10.17820/eri.2015.2.4.317
  13. Lee, C.J., Seo, I.W., Kim, C.W., and Kim, W. 2007, Application of Chiu's two dimensional velocity distribution equations to natural rivers. Journal of Korean Society of Water Environment 40(12): 957-968. (in Korean)
  14. Lee, J.W., Chegal, S.D., and Kim, C.W. 2016. Development of a hydraulic and hydrologic analysis model for the recovery of ecological connectivity at an isolated space of a stream. Ecology and Resilient Infrastructure 3(1): 1-7. (in Korean) https://doi.org/10.17820/eri.2016.3.1.001
  15. Park, M.K., Uhm, C.S., Song, Y.S., and Park, M.J. 2012, Natural river flow characteristics using velocity distribution. Journal of Disaster Management.12: 209-214
  16. Ross, S.T. and Baker, J.A. 1983. The response of fishes to periodic spring floods in a Southeastern Stream. American Midland Naturalist 109: 1-14. https://doi.org/10.2307/2425509

Cited by

  1. 저수로 물길 복원을 통한 서식처 공간 변화 연구 vol.6, pp.1, 2019, https://doi.org/10.17820/eri.2019.6.1.058
  2. 다양한 하천복원 기술을 통한 원주천의 어류 서식처 향상에 대한 연구 vol.6, pp.3, 2019, https://doi.org/10.17820/eri.2019.6.3.145
  3. Integrated Hydraulic Modelling, Water Quality Modelling and Habitat Assessment for Sustainable Water Management: A Case Study of the Anyang-Cheon Stream, Korea vol.13, pp.8, 2021, https://doi.org/10.3390/su13084330