Analytical Expressions for Transient Specific Yield and Shallow Water Table Drainage
Document Type
Article
Publication Date
2002
Keywords
water table fluctuation, soil moisture storage and release
Digital Object Identifier (DOI)
https://doi.org/10.1029/2001WR001071
Abstract
[1] New closed-form expressions are introduced to capture the dependence of specific yield on time and depth to water table. The expressions allow the user to convert observations of water table fluctuations to volumes of water released from storage in a shallow water table aquifer. Whereas a linear relationship between water table fluctuations and released volumes holds for a deep water table aquifer, this relationship is nonlinear for shallow water table aquifers. The dependence of specific yield on time stems from the slow drainage of soil water from pores above the water table. The new expressions allow determination of transient specific yield and time to drain the soil water profile for a given water table fluctuation. If the time step in a numerical groundwater model is longer than the time for limiting specific yield, then a constant (time independent) specific yield can be justifiably adopted. The new expressions are easy to use and require knowledge of soil hydraulic properties which are readily available from soil water retention data and surveys.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Water Resources Research, v. 38, issue 10, p. 11-1-11-7
Scholar Commons Citation
Nachabe, Mahmood H., "Analytical Expressions for Transient Specific Yield and Shallow Water Table Drainage" (2002). Civil and Environmental Engineering Faculty Publications. 86.
https://digitalcommons.usf.edu/egx_facpub/86
