USGS

Modeling Hydrodynamics, Temperature, and Water Quality in Henry Hagg Lake, Oregon, 2000-03

By Annett B. Sullivan and Stewart A. Rounds

Scientific Investigations Report 2004-5261

Prepared in Cooperation with Clean Water Services

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Abstract

The two-dimensional model CE-QUAL-W2 was used to simulate hydrodynamics, temperature, and water quality in Henry Hagg Lake, Oregon, for the years 2000 through 2003. Input data included lake bathymetry, meteorologic conditions, tributary inflows, tributary temperature and water quality, and lake outflows. Calibrated constituents included lake hydrodynamics, water temperature, orthophosphate, total phosphorus, ammonia, algae, chlorophyll a, zooplankton, and dissolved oxygen. Other simulated constituents included nitrate, dissolved and particulate organic matter, dissolved solids, and suspended sediment. Two algal groups (blue-green algae, and all other algae) were included in the model to simulate the lake’s algal communities. Measured lake stage data were used to calibrate the lake’s water balance; calibration of water temperature and water quality relied upon vertical profile data taken in the deepest part of the lake near the dam. The model initially was calibrated with data from 2000–01 and tested with data from 2002–03. Sensitivity tests were performed to examine the response of the model to specific parameters and coefficients, including the light-extinction coefficient, wind speed, tributary inflows of phosphorus, nitrogen and organic matter, sediment oxygen demand, algal growth rates, and zooplankton feeding preference factors.

Contents

Abstract

Introduction

Purpose and Scope

Previous Work

Methods

Model Description

Bathymetric Data and the Model Grid

Other Model Data

Model Calibration

Water Balance

Water Temperature

Water Quality

Sensitivity Analysis

Summary

Acknowledgments

References Cited

Glossary

Appendix


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For more information about the Henry Hagg Lake water-quality model, please visit the study Web site. (Contains animations of model results.)

To find out more about the USGS in Oregon, please visit our home page.




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