Flexible, sand-filled, geotextile bags (geobags) have been used in both India and Bangladesh along the banks of the Brahmaputra for protection against riverbank erosion. Geotextile containers have been researched extensively for their use in coastal structures; however, there is a gap in knowledge of the application of smaller geobags used in riverbank protection structures. In 2018, flume experiments (scaled 1:7) were performed to study the incipient motion of geobags and the methodology for sizing geobags. Building on the data collected from the flume experiments, numerical models have been employed to gain further insight into the hydraulic forces acting on the bags. The numerical models have been created using ANSYS CFX. While there is not enough data to obtain a Shields parameter which can be used for design purposes, initial estimates find the Shields value for geobags lies around 0.09, which is much larger than the value for rocks, around 0.045. The results from this study suggest that the Shields parameter varies with fill percentage of the bags. This paper also presents first results on the roughness of underwater geobag aprons.

在印度和孟加拉国，雅鲁藏布江沿布拉马普特拉河沿岸使用了柔软的，充满沙子的土工布袋（geobags），以防止河岸侵蚀。土工布容器已被广泛研究用于沿海结构中。但是，对于在河岸保护结构中使用较小的土袋的应用知识存在差距。在2018年，进行了水槽实验（按1：7比例缩放）来研究书包的初始运动以及确定书包尺寸的方法。基于从水槽实验收集的数据，已使用数值模型来进一步了解作用在袋子上的水力。数值模型是使用ANSYS CFX创建的。虽然没有足够的数据来获取可用于设计目的的Shields参数，初步估算发现，地袋的Shields值约为0.09，远大于岩石的值0.045。这项研究的结果表明，Shields参数随袋的填充百分比而变化。本文还提出了关于水下地质袋围裙粗糙度的初步结果。