Glen Canyon Environmental Studies Resource Response Analysisby David L. Wegner, US Bureau of Reclamation, Flagstaff, AZ, USA,
Abstract: The primary objective of the Glen Canyon Environmental Studies is to determine how the resources of the Grand Canyon respond to the operations of Glen Canyon Dam. Two levels of analysis have been performed. Short-term responses associated with daily and monthly operations and long-term responses associated with seasonal and annual operations. The dynamic nature of the natural resources in the Grand Canyon have required that a combination of field documentation, response analysis, and computer modeling be utilized. The Glen Canyon Environmental Studies have utilized computer models in four different areas of study: Biology; Sedimentation and Hydrology; Recreation; and, Dam Operations. The combination of computer models and actual field data collections have provided the ability to predict responses of the natural and recreation resources. A selective model evaluation and quality assurance process has been developed for each area of study. The application and use of the computer results has been tempered by a thorough understanding of the model limitations and internal assumptions.
Subject Headings: Computer models | Model analysis | Canyons | Environmental issues | Hydrologic models | Water-based recreation | Field tests | Hydro power
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