标题： 利用地球物理方法确定径流式水坝上游沉积物的演变和空间分布（法国罗纳河上游） 显示英文标题

标题： Interest of geophysical methods to determine the evolution and the spatial distribution of sedimentary deposits upstream of run-of-the-river dams (Upper Rh{ô}ne, France)

摘要： 液压结构如大坝对河流的水沙功能有直接或间接的影响。 它们可能影响河流的泥沙连续性，并在大坝上游形成泥沙堆积区，下游则出现泥沙缺乏的情况。 上游的沉积物是一个主要问题，因为它们可能影响结构的运行和/或安全，并引发额外的洪水风险。 因此，运营商需要确定这些沉积物的物理特性，以确定其再悬浮的可能性。通常，这些沉积物沉积物是通过测深数据、声纳图像或样本（清淤、取芯）来描述的。 在这项研究中，除了这些现有的监测方法外，还使用了两种地球物理方法（声学和电磁）的新测量数据。 地球物理技术的贡献是不可否认的，有助于改进这些沉积物的表征。 这些测量可以实现：i) 确定沉积物的内部结构，ii) 确定这些结构在整个发育过程中的空间分布，iii) 在水库中缺乏测深数据时评估沉积体积。 因此，这些方法的结合有助于重建沉积物沉积的演变和结构事件。 这种方法为管理者在开采和优化沉积物管理方案方面提供了补充且重要的信息。 显示英文摘要

摘要： Hydraulic structures such as dams have a direct or indirect influence on the hydro-sedimentary functioning of rivers. They can impact the sediment continuity of the river and can create a sediment imbalance with zones of sediment accumulation upstream and a lack of sediment downstream from the dam. Upstream deposits are a major issue for managers as they can impact the operation and/oraffect the safety of the structure and induce extra-flood hazards. Operators therefore seek to determine the physical characteristics of these deposits to determine their remobilization potential.Usually, these sediment deposits are described using bathymetric data, sonar images or samples (dredging, coring). For this study, new measurements from two geophysical methods (acoustic and electromagnetic) were used in addition to these current monitoring methods. The contribution of geophysical techniques is undeniable to improve the characterization of these deposits. These measurements make it possible to: i) define the internal structures of the sediments, ii) determine the spatial distribution of these structures over the entire development, iii) evaluate the volumes deposited when little bathymetric data is available on the reservoir. The coupling of these methods thus makes it possible to reconstruct the evolution and the structuring events of the sedimentary deposits. This approach provides complementary and important elements for managers in terms of exploitation and optimization of sedimentary deposits management scenarios.