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Title: Intake structure operation study, Lost Creek Dam, Oregon
Authors: United States. Army. Corps of Engineers. Portland District
Howington, Stacy E.
Keywords: Numerical modeling
OSPACE (computer program)
Resource conservation
Reservoir modeling
Water quality
Hydraulic structures
Lost Creek Dam, Oregon
Rogue River, Oregon
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-89-13.
Description: Technical Report
Abstract: This report documents an investigation into reservoir release operations at the Lost Creek Dam, Oregon. The dam is located on the pristine Rogue River which provides habitat to a valuable anadromous fishery. This fishery is highly temperature sensitive. The US Army Engineer District, Portland, presently uses multiple-level selective withdrawal technology to meet the established downstream temperature targets that would best suit the fishery. These target temperatures are being adequately approximated in the releases for portions of the year. However, in the fall, winter, and early spring, the releases are warmer than desired. This problem is thought to be contributing to a lower-than-desirable survival rate among the young salmonids. The study documented herein provided a means of predicting the intake port openings to meet the desired release temperature most closely and investigated the potential for improving the long-term operational strategies for this structure. To develop a prediction capability for the intake structure, the site-specific characteristics of selective withdrawal and simultaneous multiple-level withdrawal were studied. A 1:80-scale physical model was constructed and tested in both density stratified and homogeneous density environments. The results of these studies were incorporated into an existing numerical model (SELECT) that predicts intake port openings to achieve release targets. The results of the physical model work followed logically that from similar, previously conducted studies. The OSPACE model, an optimization routine surrounding a one-dimensional reservoir thermal model, was then used to evaluate the effects of short-term operational modifications on the reservoir's long-term ability to meet release targets. Each day in the year was assigned a priority and a release temperature deviation tolerance by the sponsor. These data were used to develop a function for comparing the relative worth of meeting prescribed targets during different periods. These evaluations indicated that some potential for improving the fall release temperatures existed, but only by sacrificing the agreement between releases and targets during the summer. An alternative set of target temperatures was produced that provide inherent resource conservation when used on a daily basis in lieu of the original targets. Appendix A gives the withdrawal angle test results from the selective withdrawal evaluation. Appendix B shows the computation of the reliability index used during model verification.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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