Physicochemical limnology of the Tongue River Reservoir,Montana |
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| Authors: | S C Whalen S A Leathe R W Gregory J C Wright |
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| Institution: | (1) Cooperative Fishery Research Unit, Montana State University, 59717 Bozeman, MT, U.S.A.;(2) Present address: Institute of Marine Science, University of Alaska, 99701 Fairbanks, AK, U.S.A.;(3) Present address: Montana Department of Fish and Game, 59901 Kalispell, MT, U.S.A.;(4) Present address: Cooperative Fish and Wildlife Research Unit, University of Florida, 32611 Gainesville, FL, U.S.A.;(5) Present address: Department of Biology, Montana State University, 59717 Bozeman, MT, U.S.A. |
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| Abstract: | A one year physicochemical survey was conducted on the Tongue River Reservoir, a run of the river impoundment in southeastern Montana. The Tongue River was the only significant inflow and supplied 93, 96 and 97% of the nutrient, major ion and water inputs to the impoundment. Heat advected from inflowing water accounted for 17% of the energy gained during the summer heating cycle. The annual nutrient load to the reservoir from the river was 20.2 g m–2 total nitrogen (TN) and 3.8 g m–2 total phosphorus (TP). Due to the absence of reducing conditions at depth and the complex seasonal pattern of water movement through the reservoir, 99% of the TN load was discharged but 49% of the TP load was retained in the reservoir. |
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| Keywords: | limnology reservoirs nutrients chemical budgets heat budgets |
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