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2025 Vol.67, Issue 4
Comparison of Stream Ecological Flow Estimates between Discrete Cross-Sections and UAV-Based DTM

단면 측량과 UAV 기반 DTM을 이용한 생태 유량 산정 비교

Hyeokjin Leea
,
Jinseok Parkb
,
Seongju Jangc
,
jaejun Goud
,
Inhong Songe†
이 혁진a
,
박 진석b
,
장 성주c
,
고 재준d
,
송 인홍e†
aPh.D. Student, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Seoul National University
bResearcher, Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University
cPh.D. Student, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Seoul National University
dM.S. Student, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Seoul National University
eAssociate Professor, Department of Rural Systems Engineering, Global Smart Farm Convergence Major, Research Institute of Agriculture and Life Sciences, Seoul National University
†Corresponding author Tel.: +82-2-880-4581, Fax: +82-2-873-2087 E-mail: inhongs@snu.ac.kr
2025. pp. 1-11
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Abstract

The objectives of this study were to evaluate the impact of riverbed continuity on habitat suitability and ecological flow estimation by comparing the use of cross-section and UAV-based DTM (Digital Terrain Model) in hydraulic models. This study was conducted on the Bokha stream, a 2.5 km reach located in Icheon. To construct the terrain input for hydraulic models, cross-sectional data were surveyed at 10 locations using an EDM instrument, while a high-resolution DTM was generated by integrating UAV-based LiDAR and SfM data, with NDWI applied to enhance accuracy in water-covered areas.. Two hydraulic habitat models, PHABSIM and River2D were applied to simulate the physical habitat conditions to Zacco platypus, the dominant species in the Bokha stream. Using River2D model with UAV-based DTM estimated the optimal ecological flow as 2.76 m³/s, compared to 4.03 m³/s for the cross-section-based River2D and 4.47 m³/s for PHABSIM. These results indicated that while PHABSIM allows for fast and simplified calculations, it tended to overestimate ecological flows due to its limited spatial resolution. In contrast, River2D with UAV-based DTM more accurately capture fine-scale spatial variations, leading to a more realistic estimation of stream habitat conditions.

Keywords
PHABSIM
River2D
habitat suitability
Weighted Usable Area (WUA)
zacco platypus
References

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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 67
  • No :4
  • Pages :1-11
  • Received Date : 2025-04-11
  • Revised Date : 2025-05-29
  • Accepted Date : 2025-06-05
  • DOI :https://doi.org/10.5389/KSAE.2025.67.4.001
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