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

[967918]本研究的目的是确定不同组合的小坝解构顺序和水库淤积特征对下游的形态影响。中心假设是，对于给定的淤积沉积物分布，可以对小水坝的解构进行排序，从而使下游释放的淤积沉积物增加了河道形态创造的可用栖息地，从而改善下游生态系统。一系列的实验室水槽实验将测量泥沙输运率和下游河床的变化，在不同的泥沙混合物组合和不同规模水坝的小坝解构阶段顺序下。在大坝拆除的每个阶段之后，下游河道的地貌变化将被测量，数据分析将产生一系列在一系列条件下的小水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.