Two-Layer Vadose Zone Model for Surface and Groundwater Interactions
Publication: Journal of Hydrologic Engineering
Volume 12, Issue 6
Abstract
Differentiation of upper and lower regions of the unsaturated (vadose) zone is important for modeling evapotranspiration, infiltration, and water table recharge. This study developed a methodology to describe relative moisture conditions in both zones for modeling soil hydrologic response. A comprehensive distributed parameter model was developed based on deterministic and physically based soil and vegetative properties. The Integrated Hydrologic Model (IHM) uses a unique relative soil moisture approach for land segment integration and is intended to simulate the complex interaction between surface-water and groundwater systems. No prior rigorous investigation or validation of the upper and lower soil response has been made. In this study, field soil moisture observations and soil characterization data were used to formulate a new basis for the upper and lower zones in the IHM. Several tests were performed to illustrate how the model reduces field-scale variability in soil moisture behavior and enhances representation of antecedent conditions. Results show that the two zones commonly exhibit different relative moisture conditions. Evidence is presented to document the existence of prolonged (many days) air entrapment and excess pore pressure, which affect soil water storage and observed water table levels.
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Acknowledgments
Support provided by the Tampa Bay Water and Southwest Florida Water Management District for this research is acknowledged and appreciated.
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Information & Authors
Information
Published In
Journal of Hydrologic Engineering
Volume 12 • Issue 6 • November 2007
Pages: 663 - 675
Copyright
© 2007 ASCE.
History
Received: Oct 25, 2005
Accepted: Apr 12, 2007
Published online: Nov 1, 2007
Published in print: Nov 2007
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