Sediment detention basins are implemented on mountain rivers to trap solid material that may aggravate the flooding of downstream settlements. However, retention structures built in the past may unnecessarily retain sediment during non-hazardous flood events, resulting in high maintenance costs and sediment deficit downstream. In addition, the so-called spontaneous self-flushing of previously retained sediment during floods has occasionally been observed. Recent research suggests to design sediment detention basins for controlling sediment passage with a guiding channel across the deposition area upstream of a hybrid barrier. Such barriers consist of a check dam with a slot orifice and an upstream bar screen with a bottom clearance in order to benefit from a combined mechanical-hydraulic retention control. The present paper enhances this pioneering research with the help of new experimental data, including a wide range of sediment mixtures and large wood, as well as variable barrier heights. Improved design criteria are provided regarding the bar screen and the basin storage capacity. The functionality of the enhanced concept for sediment detention is illustrated by a case study on a physical model: the protection of the Villard-Bonnot village (France) against torrential hazards.

在山区河流上实施了泥沙滞留盆地，以捕获可能加剧下游定居点洪水的固体物质。但是，过去建造的保留结构可能会在无害洪水事件中不必要地保留沉积物，从而导致高昂的维护成本和下游沉积物不足。此外，在洪水期间偶尔会观察到先前保留的沉积物的所谓自发自冲。最近的研究建议设计沉积物滞留池，以控制沉积物通过，并在混合屏障上游通过沉积区的引导通道。此类屏障由带有狭缝孔的止回坝和具有底部间隙的上游钢筋筛组成，以便受益于组合的机械液压保持控制。本文借助新的实验数据，包括各种各样的沉积物混合物和大木材，以及可变的屏障高度，增强了这项开创性的研究。提供了有关条形滤网和水池存储容量的改进设计标准。通过对物理模型的案例研究，说明了增强的泥沙滞留概念的功能：保护Villard-Bonnot村（法国）免受洪灾危害。