Impacts of hydropeaking and thermopeaking on the downstream habitat in the Dal River, Korea

Byungwoong Choi, Sung-Uk Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Dams located upstream only release water during the period of hydropower generation. This induces short-term fluctuations of water discharge in the downstream reach, which is called hydropeaking. As occurs quite often, if the temperature of the water released form the upstream dam is different from the water that is flowing in the downstream reach, the water temperature also tends to show short-term fluctuations, which is called thermopeaking. This study investigates the impacts of both hydropeaking and thermopeaking on the downstream habitat. The study area is a 2.3 km long reach located downstream from the Goesan Dam in the Dal River, Korea. To assess such impacts, this study conducted physical habitat simulations. The CMS-Flow model was used for the computation of the flow and water temperature, and the GEP model for the habitat simulation. Three physical habitat variables, flow depth, velocity, and water temperature, were used. The Zacco platypus was selected as the target fish in the study area. Simulation results indicated that the hydropeaking flows significantly reduced both the CSI and the WUA when compared with the natural flow regime. In addition, the use of the water temperature in the physical habitat simulations further decreased both CSI and WUA, indicating that thermopeaking is as important as hydropeaking in this type of assessment.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalEcological Informatics
Volume43
DOIs
Publication statusPublished - 2018 Jan 1

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Korean Peninsula
water temperature
Rivers
dams (hydrology)
Water
rivers
habitat
habitats
river
dam
simulation
Dams
Zacco platypus
Physical Simulation
water
water power
Temperature
Fluctuations
Fish
fish

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Modelling and Simulation
  • Ecological Modelling
  • Computer Science Applications
  • Computational Theory and Mathematics
  • Applied Mathematics

Cite this

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title = "Impacts of hydropeaking and thermopeaking on the downstream habitat in the Dal River, Korea",
abstract = "Dams located upstream only release water during the period of hydropower generation. This induces short-term fluctuations of water discharge in the downstream reach, which is called hydropeaking. As occurs quite often, if the temperature of the water released form the upstream dam is different from the water that is flowing in the downstream reach, the water temperature also tends to show short-term fluctuations, which is called thermopeaking. This study investigates the impacts of both hydropeaking and thermopeaking on the downstream habitat. The study area is a 2.3 km long reach located downstream from the Goesan Dam in the Dal River, Korea. To assess such impacts, this study conducted physical habitat simulations. The CMS-Flow model was used for the computation of the flow and water temperature, and the GEP model for the habitat simulation. Three physical habitat variables, flow depth, velocity, and water temperature, were used. The Zacco platypus was selected as the target fish in the study area. Simulation results indicated that the hydropeaking flows significantly reduced both the CSI and the WUA when compared with the natural flow regime. In addition, the use of the water temperature in the physical habitat simulations further decreased both CSI and WUA, indicating that thermopeaking is as important as hydropeaking in this type of assessment.",
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Impacts of hydropeaking and thermopeaking on the downstream habitat in the Dal River, Korea. / Choi, Byungwoong; Choi, Sung-Uk.

In: Ecological Informatics, Vol. 43, 01.01.2018, p. 1-11.

Research output: Contribution to journalArticle

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