Development and Implementation of an Optimization Model for Hydropower and Total Dissolved Gas in the Mid-Columbia River System
Publication: Journal of Water Resources Planning and Management
Volume 143, Issue 10
Abstract
Managing energy, water, and environmental priorities and constraints within a cascade hydropower system is a challenging multiobjective optimization effort that requires advanced modeling and forecasting tools. Within the mid-Columbia River system, there is currently a lack of specific solutions for predicting how coordinated operational decisions can mitigate the impacts of total dissolved gas (TDG) supersaturation while satisfying multiple additional policy and hydropower generation objectives. In this study, a reduced-order TDG uptake equation is developed that predicts tailrace TDG at seven hydropower facilities on the mid-Columbia River. The equation is incorporated into a general multiobjective river, reservoir, and hydropower optimization tool as a prioritized operating goal within a broader set of system-level objectives and constraints. A test case is presented to assess the response of TDG and hydropower generation when TDG supersaturation is optimized to remain under state water-quality standards. Satisfaction of TDG as an operating goal is highly dependent on whether constraints that limit TDG uptake are implemented at a higher priority than generation requests. According to the model, an opportunity exists to reduce TDG supersaturation and meet hydropower generation requirements by shifting spillway flows to different time periods. A coordinated effort between all project owners is required to implement systemwide optimized solutions that satisfy the operating policies of all stakeholders.
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Acknowledgments
This research was sponsored by the U.S. Department of Energy’s (DOE) Office of Energy Efficiency and Renewable Energy, Wind and Water Power Technologies Program. This study was coauthored by employees of Oak Ridge National Laboratory, managed by UT Battelle, LLC, under contract DE-AC05-00OR22725 with the U.S. Department of Energy. Accordingly, the publisher, by accepting the article for publication, acknowledges that the United States government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States government purposes. The U.S. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). The authors thank Kerry McCalman, Merlynn Bender, and Michael Pulskamp of the U.S. Bureau of Reclamation, William Proctor and Scott English of the U.S. Army Corps of Engineers, and Martha Whiteman, Waikele Frantz, and Scott Buehn of the Chelan County Public Utility District for assistance with data collection. The authors also thank Joe Taylor, former mid-C Central coordinator, for his assistance with mid-C Central’s operating policy. Special thanks to Mitch Clement of CADSWES, Alejandro Castro and Larry Weber of the University of Iowa, and Scott DeNeale, Ethan Hopping, Abigail Maloof, and Nicole Samu of Oak Ridge National Laboratory. The authors particularly thank an anonymous reviewer who provided excellent comments improving the presentation and discussion of results.
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Published In
Journal of Water Resources Planning and Management
Volume 143 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 11, 2016
Accepted: Apr 20, 2017
Published online: Aug 10, 2017
Published in print: Oct 1, 2017
Discussion open until: Jan 10, 2018
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