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http://dx.doi.org/10.12652/Ksce.2010.30.2B.211

Numerical Investigations of Physical Habitat Changes for Fish induced by the Hydropeaking in the Downstream River of Dam  

Kang, Hyeongsik (한국환경경정책.평가연구원 환경전략연구본부 물순환연구실)
Im, Dongkyun (한국건설기술연구원 수자원.환경연구본부 하천.해안.항만연구실)
Kim, Kyu-Ho (한국건설기술연구원 수자원.환경연구본부 하천.해안.항만연구실)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.2B, 2010 , pp. 211-217 More about this Journal
Abstract
This paper presents numerical investigations of the physical habitat changes induced by the hydropeaking in the downstream river of dam. For the two-dimensional ecohydraulic simulations, River2D model is used. Pirami (Zacco platypus) is selected as the target fish for investigating the impact of the hydropeaking. For validation of the model, the water surface elevations are simulated with two different water discharges. The computed results are compared with field data in the literature, and the result shows that the model successfully simulates the water flows. The weight usable area (WUA) of Pirami with the life cycle and the composite suitability index with different water discharges are computed and discussed. The results show that habitat for Pirami appears to be best in the bend region downstream of the dam. The discharge of the maximum WUA for adult Pirami is computed to be about 9 $m^3/s$. Also, the WUA computed in a condition of hydropeaking during seven days are presented. The averaged discharge of the hydropeaking appears to be about 20% larger than the drought flow, but the WUA by the hydropeaking is computed to be 60-100% smaller. This result shows that the hydropeaking reduces quantity of habitat available to fish.
Keywords
physical habitat; hydropeaking; weight usable area; composite suitability; Zacco platypus;
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Times Cited By KSCI : 2  (Citation Analysis)
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