Study of subsurface drainage of two layered soil with variable replenishment rate
Loading...
Date
2004-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The transient drainage for two layered soil, when the initial water level in the ditches is at interface of the layers has been studied. The flow system in the layered soils has been described by Boussinesq’s equation in the form of the Girinsky potential. The analytical solutions were derived to describe rise and decline of water table in response to three time varying replenishment patterns, i.e. constant, linearly decreasing and exponentially declining replenishment rate. The Laplace transformation was used to obtain the solution with initial and boundary conditions. The two layered drainage problem was also investigated on a simulated vertical Hele-Shaw model for the validation of theoretical solutions.
The comparison of results of observed and computed water table at mid point were found to be in good agreement for the entire duration of the experiments for all the three cases. From the comparison, it was also revealed that the solution for layered soil gave more accurate results as compared to homogeneous soil with weighted average hydraulic conductivity (WAHC). Hence, the proposed solutions can be used for the design of drainage system or flow through the aquifer of two layered soil.
Description
Keywords
null