Abstract This study focuses on the understanding of the hydrogeological functioning of a complex landslide affecting the coastal municipality of Villerville (Normandy, France). We wish to provide a conceptual model of functioning using a multi-disciplinary approach. A set of geomorphological, geological and hydrological data, as well as in-situ observations, were first used to understand the main landslides processes. New acquisitions were then carried out to strengthen our hypotheses thanks to passive geophysics (SP) and the characterization of physicochemical parameters of surface waters. The joint analysis of former ERT surveys and SP results is of significant interest for correlating hydrokinetic information measured at the surface with resistivity tomograms which provide internal information. This study highlights (1) a division of the behaviour into three parts, from east to west; (2) variable internal dynamics highlighted by geology and electric fields; (3) a preferential discharge of the continental water table upstream of the central area of the landslide. This work tends to demonstrate that on the basis of initial in-situ knowledge available on many study areas, the understanding of the hydrogeological functioning can be substantially improved by implementing light and inexpensive surveys, also suitable for large and complex landslides.

中文翻译：

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基于多学科方法的深部沿海滑坡水文地质评价

摘要 本研究的重点是了解影响维勒维尔（法国诺曼底）沿海城市的复杂滑坡的水文地质功能。我们希望提供一个使用多学科方法的功能概念模型。一组地貌、地质和水文数据，以及现场观测，首先被用来了解主要的滑坡过程。由于被动地球物理学 (SP) 和地表水物理化学参数的表征，随后进行了新的收购以加强我们的假设。先前 ERT 调查和 SP 结果的联合分析对于将在表面测量的流体动力学信息与提供内部信息的电阻率断层图相关联具有重要意义。本研究强调（1）将行为分为三个部分，从东到西；(2) 地质和电场突出的可变内部动力学；(3) 滑坡中心区上游大陆地下水位的优先排放。这项工作倾向于证明，在许多研究区域可用的初始现场知识的基础上，通过实施轻型和廉价的调查可以大大提高对水文地质功能的理解，也适用于大型和复杂的滑坡。