단면 측량과 UAV 기반 DTM을 이용한 생태 유량 산정 비
Comparison of Stream Ecological Flow Estimates between Discrete Cross-Sections and UAV-Based DT
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초록
The objectives of this study were to evaluate the impact of riverbed continuity on habitat suitability and ecological flow estimation by comparing theuse 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 reachlocated 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-coveredareas.. Two hydraulic habitat models, PHABSIM and River2D were applied to simulate the physical habitat conditions to Zacco platypus, the dominantspecies 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/sfor the cross-section-based River2D and 4.47 m³/s for PHABSIM. These results indicated that while PHABSIM allows for fast and simplifiedcalculations, it tended to overestimate ecological flows due to its limited spatial resolution. In contrast, River2D with UAV-based DTM more accuratelycapture fine-scale spatial variations, leading to a more realistic estimation of stream habitat conditions.
Abstract
The objectives of this study were to evaluate the impact of riverbed continuity on habitat suitability and ecological flow estimation by comparing theuse 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 reachlocated 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-coveredareas.. Two hydraulic habitat models, PHABSIM and River2D were applied to simulate the physical habitat conditions to Zacco platypus, the dominantspecies 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/sfor the cross-section-based River2D and 4.47 m³/s for PHABSIM. These results indicated that while PHABSIM allows for fast and simplifiedcalculations, it tended to overestimate ecological flows due to its limited spatial resolution. In contrast, River2D with UAV-based DTM more accuratelycapture fine-scale spatial variations, leading to a more realistic estimation of stream habitat conditions.