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首页> 外文会议>Conference on Fluvial Hydraulics >Development and implementation of a fish-friendly river bed stabilization
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Development and implementation of a fish-friendly river bed stabilization

机译：开发与实施鱼类友好的河床稳定

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To improve the flood protection at the Bregenzerach in Mellau/Austria the river bed was deepened by almost 2 m. The measure resulted m an increased bed slope of 1.3% in the upstream river reach which exceeds the equilibrium slope of the river (approx. 0.95%). Thus, a sustainable erosion process was to be expected. To counteract this erosion process and to stabilize the river bed at a slope of 1.3% two different measures were identified as possible solutions-a riprap and an artificially coarsened armor layer. The advantage of the latter would be the fact that some grain fractions of the natural bed material of the Bregenzerach may directly be used for the construction of this measure and which, thus, would reduce the implementation costs. However, practical reference experience exists for neither of the two measures as the bed slope is very high and the dimension equations for a riprap have been derived for significantly smaller slopes (maximum 0.2%). In addition, an artificially coarsened armor layer with increased grain sizes would generally be a totally new measure which has up to now only been tested for the Danube between Vienna and Hainburg (bed slope 0.04%). The flood protection measures at the Bregenzerach also influenced the mouth of a mountain torrent, which was lowered by about 1.2 m. In case of a flood event, this torrent may cause, on the one hand, a high impulse entry into the Bregenzerach drastically increasing the local bed shear stress on the bed stabilization measures and, on the other hand, high lateral sediment input. Both the high impulse entry and the constriction of the Bregenzerach due to lateral sediment input may lead to a mobilization and, in the worst case, to a failure of the stone cover early on. For these reasons the planned measures were tested for feasibility and optimized in a physical model experiment focusing on grain sizes, cover densities, layer thickness, behavior in case of sediment transport, failure mechanism and behavior in case of a high lateral sediment input. The experiments scaled 1:40 were carried out both in a straight flume and a full model.
机译：为了改善Mellau / Austria的Bregenzerach的防洪，河床近2米。该措施产生了上游河达到的1.3％的床坡，超过河流平衡坡（约9.95％）。因此，预期可持续的侵蚀过程。为了抵消这种侵蚀过程并在斜坡下稳定河床两种不同的措施，被确定为可能的溶液 - 撕裂和人工较粗的盔甲层。后者的优点是BREGENZERACH的天然床材料的一些谷物部分可以直接用于结构的结构，因此，这将降低实施成本。然而，由于床斜率非常高的两个措施的实际参考体验存在，并且已经导出用于撕裂的尺寸方程，用于显着较小的斜率（最大0.2％）。另外，具有增加的晶粒尺寸的人工较粗的装甲层通常是完全新的措施，其目前仅用于维也纳和海宁堡（床坡0.04％）之间的多瑙河测试。 Bregenzerach的防洪措施也影响了山洪流的嘴巴，下降约1.2米。在洪水事件的情况下，这种洪流可能会导致高脉冲进入Brogenzerach，大大增加对床稳定措施的局部床剪切应力，另一方面，高横向沉积物输入。既由于横向沉积物输入的高脉冲条目和布雷根茨河的收缩可能导致动员，并且在最坏的情况下，到石头盖的故障早期。由于这些原因，测试了计划的措施以进行可行性，并在专注于晶粒尺寸，覆盖密度，层厚度，在高侧沉积物输入的情况下的粒度，覆盖密度，层厚度，行为，覆盖密度，层厚度，行为的实际模型实验中进行了优化。实验缩放1:40，在直的水槽和完整模型中进行。

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