| 摘要(英) |
In the past, a large amount of pumping led to a continuous decrease in the groundwater level in the Taipei Basin, resulting in severe land subsidence. Subsequently, the implementation of a policy prohibiting groundwater pumping led to an increase in the groundwater level. However, this caused engineering problems, such as soil liquefaction. The spatial distribution of geological materials, the geology structure, and the groundwater level are essential for evaluating land subsidence and soil liquefaction. This study develops a heterogeneous hydrogeological model and applies the MODFLOW module for assessing the groundwater level.
Initially, a three-dimensional heterogeneous hydrogeological model in the study area was constructed. Non-consolidated sediment in the Taipei Basin is divided into two main layers. The first layer is the Songshan formation, primarily formed of fine grain materials, such as sand and clay. The second layer is a confined gravel layer below the Songshan formation. Transition probability - Markov chain approach was adopted to analyze the borehole data and generate realizations of the heterogeneous hydrogeological model in the first layer. The results show that the north-south spatial continuity of geological materials in the Taipei Basin is superior to the east-west direction. Furthermore, the hydrogeological model showed a 0.76% consistency with the borehole data.
Subsequently, the hydrogeological model was combined with the groundwater observation data for calibration to the steady-state groundwater level through MODFLOW packages in the Groundwater Modeling System (GMS) software. Compared to observed groundwater level, the coefficients of determination (R²) for the first and second layers were 0.95 and 0.83, respectively, while the root mean square errors (RMSE) were 0.56 and 0.60 meters. Water level changes remained within one meter when pumping volumes were increased or decreased by ten percent, indicating the potential of the Taipei Basin to provide additional water resources. The results provide a reliable assessment for groundwater resource management in the Taipei Basin in the future. |
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