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Title: Water Quality Modeling Report : Application of CE-QUAL-W2 to Model Hydrodynamics, Temperature, Dissolved Oxygen, and Coldwater Fishery Habitat in Lake Sakakawea, North Dakota, 2003-2016
Authors: United States. Army. Corps of Engineers. Omaha District
Keywords: Water quality--Mathematical models
Hydrodynamics--Mathematical models
Computer simulation
Sakakawea, Lake (N.D.)
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. Omaha District.
Abstract: The U.S. Army Corps of Engineers' Omaha District developed a water quality model of Lake Sakakawea, North Dakota using the CE-QUAL-W2 modeling framework. Lake Sakakawea maintains a two-story fishery that is comprised of coldwater and warmwater species. The primary forage fish, rainbow smelt (Osmerus mordax), and stocked Chinook salmon (Oncorhynchus tshawytscha) depend on the coldwater hypolimnion for summer survival. Model development consisted of calibration and validation of 14 calendar years (CY), 2003-2016. Data from 2003 were first used to calibrate the model, and the same parameter values, except for wind sheltering coefficient (WSC), were applied to all other CYs for validation. Since Lake Sakakawea surface elevations varied by 50 feet over the modeled 14-year period 2003-2016, WSC was allowed to vary between CYs to account for possible wind sheltering effects of emerged/submerged shoreline cliffs. The 2003 parameter values and yearly calibrated WSC acceptably simulated temperature and dissolved oxygen (DO) for reservoir depth profiles and power plant releases for the following 13 years (2004-2016). The Lake Sakakawea Model (LSM) was used to simulate the occurrence of coldwater fishery habitat in Lake Sakakawea and minimum DO levels in power plant releases. Scenario testing using the LSM indicates that the power plant withdrawal elevation from the reservoir has a significant influence on the occurrence of coldwater fishery habitat in Lake Sakakawea, as did use of the flood tunnels to release water from the reservoir during the 2011 flood conditions.
Description: Technical Report
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Reports

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