Estimation of Hydrogeological Parameters for Representative Aquifers in Jianghan Plain

Hydrogeological parameter inversion is very important for the analysis, numerical simulation and forecast, utilization and protection of regional groundwater resource evaluation. However, the relevant researches of Janhan plain are not enough. The Yanglinwei map and the Luxikou map of the Jianghan plain 1:50 000 hydrogeology survey projects were completed in 2015. The widely distributed boreholes had provided reliable information for exploring the local hydrogeological conditions. In this study, pumping test was conducted in three representative boreholes and packer test was conducted in one representative borehole. The software Aquifer Test associated with Theis model and Cooper & Jacob model were used to estimate the aquifer parameters associated with the transient pumping test data. In addition, the Dupuit model was also used to calculate the aquifer parameters with the quasi steady-state pumping test data. Finally, the feasibility and advantages of different methods proposed in this study are also thoroughly discussed. The results show that the hydraulic conductivity of the shallow aquifer in Yanglinwei is 0.075 m/d and the corresponding storage coefficient is 5.8×10^-2. The hydraulic conductivity and the storage coefficient of the deep aquifer are 9.89 m/d and 2.3×10^-5. The hydraulic conductivity and the storage coefficient of the shallow aquifer in Luxikou are 1.26 m/d and 1.1×10^-1. The average hydraulic conductivity of the fractured rocks is 0.012 m/d. It was also found that for a pumping test without an observation well, the selected drawdown data inside the well can also be used to estimate the aquifer parameters and the results are reliable.