Rethinking Dredging: Phasing Small Dam Deconstruction to Allow Sediment Releases without Harming Downstream Ecosystems

0967918 Curran拟议研究的目的是确定小水坝拆除顺序和蓄水水库沉积物特性的不同组合对下游地貌的影响。 中心假设是，对于给定的沉积物分布，小水坝的拆除可以排序，使下游释放的沉积物增加可用的栖息地所创建的通道形态，从而改善下游生态系统。 一系列的实验室水槽实验将测量泥沙输移率和变化的下游河床下的各种组合的泥沙混合物和小水坝拆除阶段序列的每一个几个缩放的大坝尺寸。 在大坝拆除的每个阶段后，将测量下游河道的地貌变化，数据分析将产生一系列在各种条件下的小型大坝拆除的定性和定量描述。

0967918CurranThe objective of the proposed research is to determine the downstream morphologic impacts caused by different combinations of small dam deconstruction sequencing and impounded reservoir sediment characteristics. The central hypothesis is that for a given distribution of impounded sediments, small dam deconstruction can be sequenced such that impounded sediments released downstream increase the available habitat created by the channel morphology and thereby improve the downstream ecosystem. A series of laboratory flume experiments will measure sediment transport rates and changes to the downstream channel bed under various combinations of sediment mixtures and small dam deconstruction phasing sequences for each of several scaled dam sizes. Geomorphic variability in the downstream channel will be measured after each phase of dam deconstruction, and data analysis will result in a series of qualitative and quantitative descriptions of small dam removals under a range of conditions.