All Issue

2023 Vol.10, Issue 2 Preview Page

Original Article

Determination of Floodplain Restoration Area Based on Old Maps and Analysis on Flood Storage Effects of Flood Mitigation Sections

고지도를 활용한 홍수터 복원 구역 선정 및 홍수완충공간의 홍수 저류효과 분석

Dong-jin Lee1
,
Un Ji23*
,
Sanghyuk Kim4
,
Hong-Kyu Ahn2
,
Eun-kyung Jang5
이 동진1
,
지 운23*
,
김 상혁4
,
안 홍규2
,
장 은경5
1Postdoctoral Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
2Research Fellow, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
3Professor, Civil and Environmental Engineering, KICT School, University of Science and Technology, Goyang 10223, Korea
4Deputy Manager, Department of Water Resources, Haeju Engineering, Seoul 06247, Korea
5Research Specialist, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
1한국건설기술연구원 수자원하천연구본부 박사후연구원
2한국건설기술연구원 수자원하천연구본부 연구위원
3과학기술연합대학원대학교 건설환경공학 교수
4해주엔지니어링(주) 수자원부 차장
5한국건설기술연구원 수자원하천연구본부 전임연구원
*Corresponding Author
30 June 2023. pp. 40-49
PDF XML Citation
Abstract

To reduce the damage of extreme flooding caused by climate change and to create flood mitigation sections in a nature-friendly riparian area, it is necessary to restore the floodplain area by referring to the past floodplain section of the current inland waterfront area before the levee was built. This study proposed a method of selecting a location for floodplain restoration using old maps of the Geum River study section and analyzed the effect of flood level reduction through unsteady flow numerical simulations using the floodplain as a flood mitigation space. As a result of analyzing changes in the river areas using old maps, the river section was estimated to gradually reduce by 27.8% (1,059,380 m2) in 2020 compared to 1919, and it was found to have an effective storage capacity of 2,200,868 m3 when restored to offline storage. The flood level and discharge control effects analyzed based on HEC-RAS unsteady flow simulation were 16 cm and 219.01 m3/s, respectively, in the downstream cross-section. In the numerical simulation in this paper, the flood mitigation space was applied as an offline reservoir. The effect of reducing the flood level may differ if levee retreat/relocation is applied.

Keywords
Flood mitigation space
Flood reduction
Floodplain restoration
Old map analysis
Riparian section

기후변화로 인한 극한홍수의 피해를 저감하면서 동시에 자연친화적 수변구역의 홍수완충공간을 조성하기 위해 제방이 건설되기 이전의 홍수범람 범위와 하천구역을 참조하여 홍수터 복원을 수행할 필요가 있다. 이에 본 연구에서는 금강 대상구간에 대해 고지도를 활용하여 홍수터 복원가능 공간의 입지 선정 방법을 제안하고 홍수터를 홍수완충공간으로 활용할 경우 홍수위저감 효과를 부정류 수치모의를 통해 분석하였다. 고지도를 활용하여 하천구역 변화를 분석한 결과, 1919년에 비해 2020년 하천구역 면적이 단계적으로 총 27.8% 감소 (1,059,380 m2)한 것으로 추정되었으며, 과거 홍수범람 구역이었던 제내지를 offline 저류지로 복원할 경우 2,200,868 m3의 유효 저류용량을 가지는 것으로 나타났다. HEC-RAS 부정류 모의를 통해 분석한 홍수위와 홍수량 조절 효과는 대상구간의 하류 단면에서 16 cm와 219.01 m3/s인 것으로 나타났다. 본 논문의 수치모의에는 홍수완충공간이 offline 저류지 형식으로 적용되었으며, 제방 후퇴/이설을 통한 홍수터의 확대가 적용될 경우 홍수위 저감 효과는 다르게 나타날 수 있다.

키워드
홍수완충공간
홍수저감
홍수터 복원
고지도 해석
수변구역
References
1
Bae, S.H. 2007. Urban Change Analysis using the 1:50,000 Topographical Map which is Produced at 1910's. Journal of the Korean Association of Geographic Information Studies 10(3): 93-103. (in Korean)
2
Brookes, A. 1987. Restoring the sinuousity of artificially straightened stream channels. Environmental Geological Water Science 10(1): 33-41. 10.1007/BF02588003
3
Dynesius, M. and Nilsson, C. 1994. Fragmentation and flow regulation of river systems in the northern third of the world. Science 266: 753-762. 10.1126/science.266.5186.75317730396
4
Iversen, T.M., Kronvang, B., Madsen, B.L., Markmann, P., and Nielsen, M.B. 1993. Re-establishment of Danish streams: restoration and maintenance measures. Aquatic Conservation: Marine and Freshwater Ecosystem 3: 73-92. 10.1002/aqc.3270030203
5
Jeroen, R., Sebastiaan, V., Chris, Z., and Richard, A., 2012, Room for the River: delivering integrated river basin management in the Netherlands. International Journal River Basin Management 10(4): 369-382. 10.1080/15715124.2012.739173
6
Ji, U., Jang, E., Bae, I., Ahn, M., and Bae, J. 2022. A Study on the Site Selection Method for the Creation of a Flood Buffer Section Considering the Nature-based Solution - Case Study from Upstream of Daecheong Dam to Downstream of Yongdam dam. Ecology and Resilient Infrastructure 9(3): 131-140. (in Korean)
7
Jin, S.N., Cho, K.H., and Cho, H.J. 2017. Delineation and Land Use Analysis of the Former Floodplains Isolated by Levees in the Cheongmi-cheon Stream, Korea. Ecology and Resilient Infrastructure 4(2): 97-104. (in Korean) 10.17820/eri.2015.2.4.324
8
Junk, J.W., Bayley, P.B., and Sparks, R.E. 1989. The flood pulse concept in river-floodplain systems. Canadian Special Publication of Fisheries and Aquatic Sciences 106: 110-127.
9
KICT. 2021. Fundamental Investigation Study on Floodplains to Improve Water Environment of Daecheong Dam. Final report for Geum River Watershed Management Committee. Korea Institute of Civil Engineering and Building Technology. (in Korean)
10
Kim, S., Yoon, B., Kim, D., and Kim, S. 2016. Accuracy Analysis of HEC-RAS for Unsteady Flow Simulation considering the Flow Pattern Variations over the Side-weir of Side-Weir Detention Basin. Journal of Korea Water Resources Association 49(1): 29-39. (in Korean) 10.3741/JKWRA.2016.49.1.29
11
Lee, C.J., Kim, J.S., Kim, K.H., 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(3): 169-183. (in Korean) 10.3741/JKWRA.2015.48.3.169
12
MoE. 2011. Technical Specification. Ministry of Environment. Ministry of Environment. (in Korean)
13
MoE. 2022. River Management Basic Planning for Geum River Upstream Section. Ministry of Environment - Guem River Basin Environment Office. (in Korean)
Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 10
  • No :2
  • Pages :40-49
  • Received Date : 2023-04-12
  • Revised Date : 2023-05-18
  • Accepted Date : 2023-05-24
  • DOI :https://doi.org/10.17820/eri.2023.10.2.040
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
Online Submission
  • NRF
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close