The hydraulic characterization of a highly anthropized coastal aquifer in France is presented. The current industrial operations of the study site prevent the use of standard ‘active’ hydrogeological investigation methods (pumping, slug tests). However, the studied field is bordered on its north-western side by a channel directly connected to the sea, which allows for characterization of the hydraulic properties of the aquifer from its natural responses to the channel’s tidal signal. Piezometers (37) were monitored, from which oscillatory water-level responses (amplitude and phase-offset) to the tidal signal were extracted through linear regression and fast Fourier transform. A two-dimensional (2D) numerical model in the frequency domain was built to simulate the oscillations. The anthropic buried walls and barriers existing at the site are represented as 1D elements in a 2D model representing the properties of the aquifer. A deterministic inversion process optimizes the spatial distribution of aquifer properties and anthropic-structure properties in the model, in order to minimize the differences between the responses simulated with the model and those measured in the field. The results of the characterization on this complex study case (flows highly constrained by hydraulic barriers or buildings, and the impossibility to perform pumping tests) generate simulations able to reproduce the observed responses. The property and simulation maps generated make it possible to take into account the impact of the anthropic structures on the groundwater flows and to localize the parts of the hydraulic barriers where most exchanges between the channel and the aquifer occur.

介绍了法国高度人工化的沿海含水层的水力特征。研究地点目前的工业运营无法使用标准的“主动”水文地质调查方法（抽水，段塞试验）。但是，所研究的油田在其西北侧与直接与海连接的河道接壤，这可以根据其对河道潮汐信号的自然响应来表征含水层的水力特性。监测压力计（37），通过线性回归和快速傅里叶变换从中提取出对潮汐信号的振荡水位响应（幅度和相位偏移）。建立了频域中的二维（2D）数值模型来模拟振荡。现场的人为掩埋墙和障碍物在表示含水层属性的2D模型中用1D元素表示。确定性反演过程优化了模型中含水层特性和人类结构特性的空间分布，以最小化模型模拟的响应与现场测量的响应之间的差异。在这个复杂的研究案例中的表征结果（水力障碍或建筑物高度限制了流量，并且无法执行泵送测试）生成了能够重现观察到的响应的模拟。