海底承压含水层排泄电阻率法探测效果模拟与分析

海底承压含水层排泄是海底地下水排泄的一种主要形式。由于这一过程发生在海水层下部，探测难度较大。为探讨海洋多电极电阻率法对该过程的探测能力，根据典型海底承压含水层地质模型构建不同排泄阶段地电模型，模拟海面和海床面两种探测情形分别进行多电极电阻率法理论探测结果计算和物理模拟，并对所得电阻率剖面进行对比分析。研究结果表明，水面多电极电阻率探测剖面能够清晰刻画出排泄入海的淡水体在海水中迁移、混合过程，但剖面异常特征和分辨率受探测装置形式、电极极距、海水深度影响；海床面探测则对沉积层中咸淡水交换过程反映能力更强，沉积层中的锲形海水侵入体可得到良好反映。

The research of electrical resistivity system's application effect simulation in coastal submarine confined groundwater discharge

Confined groundwater discharge is a major form of submarine groundwater discharge. Because this process occurs in the bottom of seawater, detection is more difficult. To explore the detection capabilities of the marine multi-electrode resistivity method for this process, according to the typical geological model of the confined aquifer in the seabed, the geoelectric models with different drainage stages were constructed. Simulate sea surface and sea floor detection conditions, and compare the resulting resistivity profiles. The results of the study indicate that the water surface multi-electrode resistivity detection profile can clearly depict the migration and mixing process of freshwater excreted into the sea in seawater. However, the anomalous profile and resolution of the profile are affected by the detection device, electrode pole pitch, and seawater depth. Seabed surface detection results are more capable of reflecting the exchange process of brackish water in sediments, and the seawater intrusions in sediments can be well reflected.