Abstract
This study presents the impact of natural flow patterns on downstream aquatic species habitats in a reach of the Geum River, Korea. The study reach is a 13.4 km long, located downstream of the Yongdam Dam. To assess such an impact, this study performed physical habitat simulations. The River2D model was used for the computation of the flow field and morphology, and the Habitat Suitability Index (HSI) model for the habitat simulation. Three habitat variables—flow depth, velocity, and substrate were used. The Zacco platypus and Baetis fuscatus were selected as the target fish and benthic macro-invertebrate, respectively. Using the building block approach (BBA), the scenarios for modifying dam operations were constructed in the study reach. Scenario 1, scenario 2, and scenario 3 were proposed by using the magnitude–duration concept, base flow allocation concept, and seasonally adjusted minimum flow allocation concept, respectively. Simulation results indicated that the scenarios’ effects significantly increased by about 14.3% for the weighted usable area (WUA). In addition, the morphology change with the restoration of flood events was investigated. It was revealed that the morphology change in the physical habitat simulations further increased by about 13% for the WUA. The change of dam operations through natural flow patterns is more advantageous to aquatic species.
Highlights
During the latter half of the 20th century, 47,000 large dams were built worldwide to block the flow of the rivers [1,2,3]
The results indicate that the physical habitat suitability of target species in the study reach is most affected by the change in discharge
Compared to the weighted usable area (WUA) without morphology change. This is consistent with findings by Moir et al It can be seen that the morphology change effect increased the WUA significantly in the study reach
Summary
During the latter half of the 20th century, 47,000 large dams were built worldwide to block the flow of the rivers [1,2,3]. Dams can significantly change the flow regime, including of rivers in the 1980s and developed its first methodology for flow assessments during the early magnitude, timing, frequency, and duration of flow events [8,22,24,25,26]. The goal of this study was to investigate the impact of the modification of The dam River2D operation model through the natural flow patterns in downstream habitats. The impact of modifying dam operation through natural flow pattern in physical method of Gosse [33], the HSCs (habitat suitability curves)the of target species were constructed for eachhabitat simulations examined. First,The the CSI impact of modifying dam operation natural flow pattern in physical habitat indices presented.
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