Sensitivity analysis and determination of streambed leakance and aquifer hydraulic properties

摘要: Abstract A nonlinear regression method is used to calculate the hydraulic parameters of a stream-aquifer system using pumping test data. Five parameters, including horizontal conductivity (Kx), aquifer anisotropy (Ka), streambed leakance l, specific storage Ss, and yield Sy, can be calculated. MODFLOW, coupled method, simulates groundwater flow that affected by streams. Sensitivity analyses indicate for given system, quality data improved through careful selection observation wells, as well an appropriate duration. An optimal location where magnitude sensitivities enhanced correlation transient two reduced. Generally, longer period will increase sensitivity l Kx reduce between Sy l. Results from hypothetical examples field suggest two-well analysis significantly coefficients; result, convergence occurs faster estimated standard errors are