Integrated Hydrodynamic and Water Quality Modeling System to Support Nutrient Total Maximum Daily Load Development for Wissahickon Creek, Pennsylvania
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Volume 132, Issue 4
Abstract
This paper presents a hydrodynamic and water quality modeling system for Wissahickon Creek, Pa. Past data show that high nutrient levels in Wissahickon Creek were linked to large diurnal fluctuations in oxygen concentration, which combining with the deoxygenation effect of carbonaceous biological oxygen demand (CBOD) causes violations of dissolved oxygen (DO) standards. To obtain quantitative knowledge about the cause of the DO impairment, an integrated modeling system was developed based on a linked environmental fluid dynamics code (EFDC) and water quality simulation program for eutrophication (WASP/EUTRO5) modeling framework. The EFDC was used to simulate hydrodynamic and temperature in the stream, and the resulting flow information were incorporated into the WASP/EUTRO5 to simulate the fate and transport of nutrients, CBOD, algae, and DO. The standard WASP/EUTRO5 model was enhanced to include a periphyton dynamics module and a diurnal DO simulation module to better represent the prototype. The integrated modeling framework was applied to simulate the creek for a low flow period when monitoring data are available, and the results indicate that the model is a reasonable numerical representation of the prototype.
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Acknowledgments
This study was sponsored by the U.S. Environmental Protection Agency, Region 3. The writers would like to thank Mark Sievers, and Katherine Labuhn at Tetra Tech, Inc. for their valuable assistance in data process and figure production.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 132 • Issue 4 • April 2006
Pages: 555 - 566
Copyright
© 2006 ASCE.
History
Received: Oct 4, 2004
Accepted: Jun 15, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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