Larkin Mill Dam Oblique photography of measured channel cross-sections from left and right bank monuments from 2008-06-09 to 2010-036-16 (NCEI Accession 0152485)

We are collecting stream channel geometry and bed sediment grain size distribution data at the Parker River to evaluate physical habitat changes associated with the planned Larkin Mill Dam removal. In addition to evaluating channel response to dam removal, our two years of pre-removal data collection (2008 and 2010) bracketed a large flood event that allowed us to investigate whether this small dam is an efficient sediment trap. Our analyses suggest that sediments readily move over the dam during storm events and other flows, and we hypothesize that, aside from a thin active surface layer where erosion and deposition regularly occurs, the small quantity of stored sediments is relatively stable.

我们于帕克河（Parker River）开展河道几何形态与河床沉积物粒度分布数据采集工作，以评估与计划拆除拉金米尔大坝（Larkin Mill Dam）相关的物理生境变化。除评估河道对大坝拆除的响应外，我们在大坝拆除前的两年数据采集周期（2008年与2010年）覆盖了一场大型洪水事件，借此得以探究这座小型水坝是否为高效的沉积物截留体。分析结果表明，风暴事件及其他水流过程中，沉积物可轻松越过该水坝；我们据此提出假说：除了一层会频繁发生侵蚀与沉积的薄活动表层之外，所蓄积的少量沉积物整体相对稳定。