Impact of hydropeaking on downstream fish habitat at the Goesan Dam in Korea

Choi, Sung Uk; Kim, Seung Ki; Choi, Byeong-Dae; Kim, Yeonjoo

doi:10.1002/eco.1861

Cited by 16 publications

(16 citation statements)

References 27 publications

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“…This indicates that the water release from the dam significantly affects the habitat suitability of the target species. This is consistent with previous findings [16][17][18]46,47].…”

Section: Natural Flow Regime Versus Dam Dischargesupporting

confidence: 94%

“…That is, the magnitude of discharge is flattened over the year, and the downstream reach no longer experiences flood events. Changes in the natural flow regime due to hydropeaking may affect the aquatic habitat in the downstream reach from the dam [17,18,[50][51][52][53][54]. However, the upstream dam often releases large amounts of water during the flood season.…”

Section: Restoration Of Flushing Flood Eventsmentioning

confidence: 99%

“…Physical habitat simulations have been successfully used to solve various relevant problems. Using physical habitat simulation has assisted with designing river restorations [12,13], as well as evaluating river health [14,15] and the impact of flow regime change by dam construction [6,[16][17][18]. Figure 1 shows the area of the study in the Geum River, Korea.…”

Section: Introductionmentioning

confidence: 99%

“…Water 2018, 10, x FOR PEER REVIEW 2 of 17 [6,[16][17][18]. Similarly, a hydropeaking mitigation project [19][20][21] and the change of dam operation was investigated with respect to the ecological requirements downstream from the dam [8,22,23].…”

Section: Introductionmentioning

confidence: 99%

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Dominant Fish and Macroinvertebrate Response to Flow Changes of the Geum River in Korea

Kang

Choi

2018

Water

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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.

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“…This indicates that the water release from the dam significantly affects the habitat suitability of the target species. This is consistent with previous findings [16][17][18]46,47].…”

Section: Natural Flow Regime Versus Dam Dischargesupporting

confidence: 94%

Section: Restoration Of Flushing Flood Eventsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dominant Fish and Macroinvertebrate Response to Flow Changes of the Geum River in Korea

Kang

Choi

2018

Water

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“…Physical habitat simulation is a numerical tool that quantifies the habitats for target species in terms of the physical habitat variables in a stream. Previous studies showed that released water from a dam adversely affects the downstream fish habitat [45][46][47][48]. A variety of physical habitat simulations have been carried out, showing that hydropeaking and thermopeaking flows decrease habitat suitability for target species in the downstream reach of the dam [49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Baseflow Contribution to Streamflow and Aquatic Habitats Using Physical Habitat Simulations

Choi

Kang

Lee

2018

Water

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A scientific understanding of the baseflow contribution to streams and watershed processes is critical when dealing with water policy and management issues. However, most previous studies involving physical habitat simulation have been performed without considering the seepage of water from the underground into streams. Motivated by this, herein, we report an investigation of the impact of baseflow using physical habitat simulations for both dominant fish and benthic macroinvertebrate. The study area was located along the reach of the Ungcheon Stream, located 16.50 km downstream and 11.75 km upstream from the Boryeong Dam in the Republic of Korea. For the physical habitat simulation, Zacco platypus and Baetis fuscatus were selected as the target fish and benthic macroinvertebrate, respectively. The HydroGeoSphere (HGS) model (Aquanty Inc., Waterloo, ON, Canada) and the River2D model (Version 0.95a, University of Alberta, Edmonton, AB, Canada) were used for hydrologic and hydraulic simulations, respectively. The Habitat Suitability Index (HSI) model was used for the habitat simulations. Three habitat variables, flow depth, velocity, and substrate, were used. To assess the impact of baseflow, this study performed a physical habitat simulation using each representative discharge, with and without considering baseflow. It was found that the baseflow effects significantly increase the habitat suitability in the study reach. To restore the aquatic habitat, a scenario for modifying dam operations through natural flow patterns is presented using the Building Block Approach (BBA). In the study, the adjusted minimum flow allocation concept was used. It was revealed that the modified dam operations significantly increased the Weighted Usable Area (WUA) by about 48% for both target species. The results indicate that modifying the dam operations through restoration to natural flow regimes but also through inclusion of the baseflow are advantageous to aquatic fish habitats.

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Application of a fish habitat model to assess habitat fragmentation using high flow and sediment transport in the Rumei Dam in Lancang River (China)

Yang,

Bao,

Cong

et al. 2023

Ecohydrology

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Dam construction and operation can result in serious disturbances to the downstream flow regime and fluvial process, river morphology and the river's ecological condition worldwide. To understand the effects of discharge and sedimentation on fish habitats and ecosystems, an ecohydraulic approach was applied to one of the mega hydropower schemes in the downstream Lancang River (Tibet). The approach comprised a dam operation module with high flow and sediment transport and the application of a dynamic fish habitat model for assessing habitat fragmentation of two targeted fish species: Schizothorax prenanti (S. prenanti) and Schizothorax davidi (S. davidi). The hydrodynamics of the river system and the assessed fish habitat show a significant impact of dam construction and operation on the downstream riverine ecosystem, in which fish habitats were found rapidly deteriorated with the destruction of feeding and reproductive grounds. To improve fish habitat after dam construction, the sediment supplement was applied to the river and shown to be a useful restoration strategy, which recovers the habitat fragmentation of target fish. Our model not only is useful to predict dam operation impacts on the Lancang River's ecological status but also shows great potential in mitigating hydropower‐induced environmental impacts and developing river conservation guidelines worldwide.

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Impact of hydropeaking on downstream fish habitat at the Goesan Dam in Korea

Cited by 16 publications

References 27 publications

Dominant Fish and Macroinvertebrate Response to Flow Changes of the Geum River in Korea

Dominant Fish and Macroinvertebrate Response to Flow Changes of the Geum River in Korea

Baseflow Contribution to Streamflow and Aquatic Habitats Using Physical Habitat Simulations

Application of a fish habitat model to assess habitat fragmentation using high flow and sediment transport in the Rumei Dam in Lancang River (China)

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