Parameter sensitivity analysis of 3D numerical simulation in the high-pressure groundwater

Based on a pump test, a 3D groundwater mathematic model were established to describe the limestone aquifers flow which with high pressure(more than 7 MPa). The local and global parameters sensitivity analysis were applied to study the high-pressure Ordovician limestone aquifer. The result shows that the model is more sensitive to the level of water head boundary than to other parameters, and the coefficient of elastic specific yield(Ss) not only affect the degree of water head changes but also affect the response time of the dynamic head. According to the result of global sensitivity analysis, the sum of local parameters sensitivity smaller than the global combined sensitivity, The total model sensitivity is relatively large.