IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Impacts of Dam Regulated Discharge Scenarios on the Thermal Regime of the Lower Deadwood River in Ce...
Impacts of Dam Regulated Discharge Scenarios on the Thermal Regime of the Lower Deadwood River in Central Idaho, USA
Author : Rohan Benjankar, Daniele Tonina, Andrew W. Tranmer, Matthew G. Tiedemann and Peter Goodwin
Dam operations have altered the thermal regime of streams worldwide with adverse effects on fish habitat that force aquatic species to change their habitat. However, impact assessment is typically based on comparing dam operations with historic scenarios and does not account for climate variability. Here, we investigate the effect of dam operations on the riverine thermal regime and available wetted areas under three climate scenarios. We constructed a wet, dry and average year based on historic hydrological data to understand whether dam operations may minimize the effect of climate variability. Our study site is a 38km long reach of Lower Deadwood River between Deadwood Reservoir and the confluence with the Payette River. The Deadwood Reservoir is operated as a retention basin for irrigation purposes with releases during the summer months. We developed a hydraulic and temperature model for the stream under two different dam operations, which were compared with a reconstructed unregulated hydro- and thermo-graphs. Results show that dam operations shift temperature and hydraulic cues from summer months into the fall. Extension of warmer water temperatures into the fall season could provide stable and predictable cues for riverine organisms that may use it in lieu of the warm unregulated summer period.
File Size : 406,747 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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