ABSTRACT
In the present paper, aquifer modeling and sensitivity analysis of solution parameters have been conducted. First, both linear and nonlinear elastic solutions for one-dimensional land subsidence caused by aquifer artificial discharge and recharge have been introduced. The analytical solutions in terms of displacement corresponding to boundary and initial conditions are based on a conceptual sandwich model. The boundary conditions in terms of displacement and strain comprise linear and periodic changes that are induced by fluctuations of hydraulic head due to discharge-recharge activity. Second, sensitivity analysis of parameters for both confining layer and discharge-recharge activity has been carried out for the sandwich model installed with two wells. Parameter sensitivity related to both the ASR activity and aquifer property has been analyzed within an idealized compressible semi-pervious layer for vertical deformation caused by groundwater withdrawal and injection. Comparison of parameter sensitivity between the linear and nonlinear models is conducted. This is the first attempt to analyze parameter sensitivity for elastic linear and nonlinear solutions in terms of displacement. Finally, the elastic solution is applied to estimate land subsidence at the Las Vegas Valley. The prediction for vertical land deformation is satisfactory. Results of sensitivity analysis for aqui-tard and discharge-recharge parameters can be used for guidance of ASR applications so that the potential risk of land subsidence can be reduced.
