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2022 Vol.55, Issue 12 Preview Page

Research Article

Estimation of ecological flow and fish habitats for Andong Dam downstream reach using 1-D and 2-D physical habitat models

1차원 및 2차원 물리서식처 모형을 활용한 안동댐 하류 하천의 환경생태유량 및 어류서식처 추정

Yongwon Kima
,
Jiwan Leeb
,
Soyoung Wooc
,
Soohong Kimd
,
Jongjin Leee
,
Seongjoon Kimf*
김 용원a
,
이 지완b
,
우 소영c
,
김 수홍d
,
이 종진e
,
김 성준f*
aIntegrated Ph.D. Student, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University, Seoul, Korea
bResearch Professor, Division of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul, Korea
cPh.D. Candidate, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University, Seoul, Korea
dResearcher, Water and Land Group, Division for Integrated Water Management, Korea Environment Institute, Sejong, Korea
eResearcher, Bio-Monitoring Center Inc., Sejong, Korea
fProfessor, Division of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul, Korea
a건국대학교 일반대학원 사회환경플랜트공학과 석박사통합과정
b건국대학교 공과대학 사회환경공학부 학술연구교수
c건국대학교 일반대학원 사회환경플랜트공학과 박사수료
d한국환경연구원 물국토연구본부 통합물관리연구실 연구원
e(주)생물모니터링센터 책임연구원
f건국대학교 공과대학 사회환경공학부 교수
*Corresponding Author
31 December 2022. pp. 1041-1052
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Abstract

This study is to estimate the optimal ecological flow and analysis the spatial distribution of fish habitat for Andong dam downstream reach (4,565.7 km2) using PHABSIM (Physical Habiat Simulation System) and River2D. To establish habitat models, the cross-section informations and hydraulic input data were collected uisng the Nakdong river basic plan report. The establishment range of PHABSIM was set up about 410.0 m from Gudam streamflow gauging station (GD) and about 6.0 km including GD for River2D. To select representative fish species and construct HSI (Habitat Suitability Index), the fish survey was performed at Pungji bridge where showed well the physical characteristics of target stream located downstream of GD. As a result of the fish survey, Zacco platypus was showed highly relative abundance resulting in selecting as the representative fish species, and HSI was constructed using physical habitat characteristics of the Zacco platypus. The optimal range of HSI was 0.3~0.5 m/s at the velocity suitability index, 0.4~0.6 m at the depth suitability index, and the substrate was sand to fine gravel. As a result of estimating the optimal ecological flow by applying HSI to PHABSIM, the optimal ecological flow for target stream was 20.0 m3/sec. As a result of analysis two-dimensional spatial analysis of fish habitat using River2D, WUA (Weighted Usable Area) was estimated 107,392.0 m2/1000 m under the ecological flow condition and it showed the fish habitat was secured throughout the target stream compared with Q355 condition.

Keywords
PHABSIM
River2D
HSI
Zacco platypus
Ecological flow

본 연구는 낙동강 본류의 안동댐 하류(4,565.7 km2) 하천을 대상으로 1차원 물리적 서식처 모형인 PHABSIM과 2차원 물리적 서식처 모형인 River2D를 활용하여 대상어종에 대해 환경생태유량을 산정하고 어류서식처에 대한 2차원 공간분석을 수행하였다. 서식처 모형의 구축을 위해 낙동강유역의 하천기본계획보고서를 활용하여 하천단면정보와 수리학적 입력자료를 수집하였다. PHABSIM 구축범위는 구담수위관측소(GD)로부터 약 410.0 m, River2D의 경우 GD를 포함한 약 6.0 km에 대해 구축하였다. 대상어종 선정 및 HSI 구축을 위해 대상하천의 하류에 위치한 풍지교에서 어류 현장조사를 수행하였다. 어류 현장조사 결과, 피라미가 우점종으로 나타나 피라미(Zacco platypus)를 대상어종으로 선정하였고 피라미의 물리적 서식처 특성을 활용하여 HSI를 구축하였다. 피라미의 최적 HSI 범위는 유속에서 0.3~0.5 m/s, 수심에서 0.4~0.6 m, 그리고 하상재료는 모래에서 잔자갈로 나타났다. HSI를 PHABSIM에 적용하여 환경생태유량을 산정한 결과, 대상하천의 최적 환경생태유량은 20.0 m3/sec로 산정되었다. River2D를 활용하여 어류서식처의 2차원 공간분석을 수행한 결과 WUA는 환경생태유량 조건에서 107,392.0 m2/1000 m으로 산정되었고, Q355 조건과 비교하여 하천 전반적으로 어류서식처가 확보되는 것을 확인하였다.

키워드
PHABSIM
River2D
HSI
피라미
환경생태유량
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 55
  • No :12
  • Pages :1041-1052
  • Received Date : 2022-09-30
  • Revised Date : 2022-11-03
  • Accepted Date : 2022-11-15
  • DOI :https://doi.org/10.3741/JKWRA.2022.55.12.1041
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