2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 2:45 PM - 3:00 PM | MANAGEMENT AND LIMNOLOGY INTERACT TO DRIVE WATER TEMPERATURE PATTERNS IN AN IMPOUNDED MIDDLE ROCKIES RIVER SYSTEM | 420 A
MANAGEMENT AND LIMNOLOGY INTERACT TO DRIVE WATER TEMPERATURE PATTERNS IN AN IMPOUNDED MIDDLE ROCKIES RIVER SYSTEM
Impoundments influence water temperature in their outflowing waters, potentially altering species dispersal, community structure, and ecological productivity. This study aims to improve understanding of the interaction between reservoir management and tailwater temperatures. We examined summertime temperature patterns in a mid-size irrigation storage reservoir, Island Park Reservoir (IPR) and its tailwater, the Henry’s Fork of the Snake River, in East Idaho. Seventeen years of climatic, hydrologic, and management-related variables were examined to identify predictors of interannual variation in mean tailwater temperatures. Temperatures were best predicted by reservoir draft. Every 1x10^6 cubic meters of water passed through IPR dam resulted in a 0.016°C increase in water temperature in the tailwater. Examination of two years of weekly in-reservoir thermal profiles provided a potential mechanistic explanation; high reservoir draft eliminates cool hypolimnetic water in the reservoir, allowing warm epilimnetic water into the tailwater, increasing tailwater temperature. Reservoir draft is controlled by downstream irrigation water rights holders. Thus, irrigation, which can depend on a variety of climate and weather-related factors occurring far from our study system, can influence river water temperature patterns, a key variable controlling ecological processes.
- Management
- Temperature
- Water Quality
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Presenters/Authors
John McLaren
(), Utah State University, jacksmclaren@gmail.com;
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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Rob Van Kirk
(), Henry's Fork Foundation, rob@henrysfork.org;
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Melissa Muradian
(), Henry's Fork Foundation, melissa@henrysfork.org;
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