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INTERVENTION ANALYSIS OF WATER QUALITY RECORDS1
Authors:Paul H Whitfield  Paul F Woods
Institution:1. Head, Monitoring and Agreements Division, Water Quality Branch, Inland Waters Directorate, Environment Canada, 502-1001 West Pender Street, Vancouver, British Columbia V6E 2M9;2. Hydrologist, U.S. Geological Survey, Water Resources Division, 1209 Orca Street, Anchorage, Alaska 99501.
Abstract:The impoundment of the Kootenai River by Libby Dam caused changes in discharge and water quality in the river downstream from Lake Koocanusa. The changes observed downsteam were largely attributable to the depth of withdrawal from the reservoir and the reservoir's ability to store and mix various influent water masses. The preimpoundment and postimpoundment time series of discharge and six water quality variables were autocorrelated and exhibited strong seasonality. Intervention analysis, a technique employing Box-Jenkins time series models, was used to quantify the nature and magnitude of the changes in water quality after the construction of Libby Dam. The models were developed with data from June 1967 through February 1981 and were able to satisfactorily forecast riverine conditions from March 1981 through January 1982.
Keywords:intervention analysis  water quality  time series modeling  stochastic modeling  
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