[논문]PHABSIM과 SWAT을 이용한 연계모델링 적용성 평가

김용원; 변상돈; 박진석; 우소영; 김성준

doi:10.3741/jkwra.2021.54.10.819

[국내논문] PHABSIM과 SWAT을 이용한 연계모델링 적용성 평가
Evaluation of applicability of linkage modeling using PHABSIM and SWAT 원문보기

Journal of Korea Water Resources Association = 한국수자원학회논문집, v.54 no.10, 2021년, pp.819 - 833

김용원 (건국대학교 일반대학원 사회환경플랜트공학과) , 변상돈 (강원대학교 일반대학원 환경의생명융합학과) , 박진석 (서울대학교 일반대학원 생태조경.지역시스템공학부 지역시스템공학전공) , 우소영 (건국대학교 일반대학원 사회환경플랜트공학과) , 김성준 (건국대학교 공과대학 사회환경공학부)

초록
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본 연구는 안동댐 하류(4,565.7 km²)를 대상으로 준분포형 수문모델인 SWAT과 서식처모델인 PHABSIM을 연계하여 적용성을 평가하고, 대상어종에 대해 환경생태유량을 산정하였다. 대상유역 내 다목적 댐 2개(안동댐: ADD, 임하댐: IHD)의 실제운영자료를 구축하여 SWAT에 적용하였으며 추가로 1개의 수위관측소(구담: GD)을 선정하여 ADD, IHD, GD에 대해 유입·유출량 검보정을 수행하였다. 검보정 결과 R²는 0.52 ~ 0.74, NSE는 0.48 ~ 0.71, RMSE는 0.92 ~ 2.51 mm/day로 분석되었다. 검보정된 GD의 유출량을 이용하여 2012년부터 2020년까지의 유황분석을 실시한 결과, 관측값의 유황분석 결과와 비교하여 평균 Q185는 36.5 m³/sec (-1.4%), 평균 Q275는 23.8 m³/sec (0%)로 분석되어 Q185와 Q275를 PHBASIM의 유량 경계조건으로 적용하였다. PHABSIM의 대상하천은 GD가 위치한 410 m 구간으로 선정하였고 하천기본계획보고서 기반으로 하천단면 및 수리인자를 구축하였다. 대상하천의 우점종은 피라미, 아우점종은 돌고기로 분석되었으며 문헌조사를 통해 대상어종의 HSI를 수집하였다. PHABSIM 수위 모의결과, Q185, Q275에서 각각 -0.12, +0.00 m의 오차가 발생하였고, 유속모의의 경우 Q185, Q275에서 각각 +0.06, +0.09 m/s의 오차가 발생하여 연계모의가 적절하게 된 것을 확인하였다. PHABSIM의 서식처 모의 결과, 피라미의 평균 가중가용면적 WUA와 환경생태유량은 76,817.0 m²/1000m, 20.0 m³/sec, 돌고기의 평균 WUA와 환경생태유량은 46,628.6 m²/1000m, 9.0 m³/sec로 분석되어 피라미가 돌고기보다 대상하천에 대해 적응성이 높은 것을 확인할 수 있었다.

Abstract ▼ AI-Helper

This study is to evaluate applicability of linkage modeling using PHABSIM (Physical Habitat Simulation System) and SWAT (Soil and Water Assessment Tool) and to estimate ecological flow for target fishes of Andong downstream (4,565.7 km2). The SWAT was established considering 2 multi purpose dam (ADD, IHD) and 1 streamflow gauging station (GD). The SWAT was calibrated and validated with 9 years (2012 ~ 2020) data of 1 stream (GD) and 2 multi-purpose dam (ADD, IHD). For streamflow and dam inflows (GD, ADD and IHD), R2, NSE and RMSE were 0.52 ~ 0.74, 0.48 ~ 0.71, and 0.92 ~ 2.51 mm/day respectively. As a result of flow duration analysis for 9 years (2012 ~ 2020) using calibrated streamflow, the average Q185 and Q275 were 36.5 m3/sec (-1.4%) and 23.8 m3/sec (0%) respectively compared with the observed flow duration and were applied to flow boundary condition of PHABSIM. The target stream was selected as the 410 m section where GD is located, and stream cross-section and hydraulic factors were constructed based on Nakdong River Basic Plan Report and HEC-RAS. The dominant species of the target stream was Zacco platypus and the sub-dominant species was Puntungia herzi Herzenstein, and the HSI (Habitat Suitability Index) of target species was collected through references research. As the result of PHABSIM water level and velocity simulation, error of Q185 and Q275 were analyzed -0.12 m, +0.00 m and +0.06 m/s, +0.09 m/s respectively. The average WUA (Weighted Usable Area) and ecological flow of Zacco platypus and Puntungia herzi Herzenstein were evaluated 76,817.0 m2/1000m, 20.0 m3/sec and 46,628.6 m2/1000m, 9.0 m3/sec. This results indicated Zacco platypus is more adaptable to target stream than Puntungia herzi Herzenstein.

주제어

표/그림 (14)

그림 Fig. 1. Flowchart of this study
그림 Fig. 2. Andong downstream
그림 Fig. 3. Target stream of study area
그림 Fig. 4. GIS data of the Andong downstream
표 Table 1. The characteristics and features of target fishes (www.nifs.go.kr, 2021.07.01. access)
그림 Fig. 5. HSI (Habitat Suitability Index) for target fishes
표 Table 2. The SWAT calibrated parameters for dam inflow and streamflow
그림 Fig. 6. The calibration and validation results for gauging station streamflow and weir inflow (a) ADD, (b), IHD, (c) GD
그림 Fig. 7. The flow duration curves (2012 ~ 2020) (a) observed flow duration, (b) simulated flow duration
표 Table 3. Summary of model calibration and validation for streamflow and dam inflows at 3 calibration points
그림 Fig. 8. The calibration results of water surface level and velocity at GD cross-section (a) water surface level, (b) water velocity
그림 Fig. 9. Estimation of ecological flow for Zacco platypus and Puntungia herzi Herzenstein
표 Table 4. The flow duration results for Andong downstream
그림 Fig. 10. Analysis of ecological flow insufficient days for target fishes

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