Interaction of Stream and Sloping Aquifer Receiving Constant Recharge

by A. Upadhyaya, Sr. Sci.; Directorate of Water Mgmt. Res., WALMI Complex, Phulwari Sharif, Patna - 801 505, India,
H. S. Chauhan, AICTE Emeritus Fellow; Dept. of Irrig. and Drain. Engrg., G. B. Pant Univ. of Agric. and Technol., Pantnagar - 263 145, Dist. Udham Singh Nagar, India,

Serial Information: Issue 5, Pg. 295-301

Document Type: Journal Paper

Discussion: Teloglou I. S. (See full record)

Abstract: An analytical solution and finite-element numerical solution of a linearized and nonlinear Boussinesq equation, respectively, were obtained to describe water table variation in a semi-infinite sloping/horizontal aquifer caused by the sudden rise or fall of the water level in the adjoining stream. Transient water table profiles in recharging and discharging aquifers having 0, 5, and 10% slopes and receiving zero or constant replenishment from the land surface were computed for t = 1 and 5 days by employing analytical and finite-element numerical solutions. The effect of linearization of the nonlinear governing equation, recharge, and slope of the impermeable barrier on water table variation in a semi-infinite flow region was illustrated with the help of a numerical example. Results suggest that linearization of the nonlinear equation has only a marginal impact on the predicted water table heights (with or without considering constant replenishment). The relative errors between the analytical and finite-element numerical solution varied in the range of -0.39 to 1.59%. An increase in slope of the impermeable barrier causes an increase in the water table height at all the horizontal locations except at the boundaries for the recharging case and a decrease for the discharging case.

Subject Headings: Slopes | Aquifers | Water table | Finite element method | Rivers and streams | Water discharge | Linear functions | Linear analysis |

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