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

拟议研究的目的是确定不同组合的小坝解体顺序和蓄水水库泥沙特性对下游地形的影响。中心假设是，对于给定的蓄水泥沙分布，可以对小型大坝的破坏进行排序，从而使下游释放的蓄水泥沙增加由河道形态创造的可用栖息地，从而改善下游生态系统。一系列实验室水槽实验将测量泥沙输移速率和下游河床在不同泥沙混合物组合和小坝解体阶段序列下的变化，针对不同规模的大坝规模。下游河道的地貌变化将在大坝解体的每个阶段进行测量，数据分析将导致一系列定性和定量的描述，在一系列条件下的小坝拆除。

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.