Doctoral Dissertation Research: Effects of the Spatial and Temporal Distribution of Form Roughness on Sediment Transport

这项研究的目的是为了更好地理解河道内的过程-反应相互作用。具体而言，海底粗糙度元素和沉积物输运率的空间分布和时间演变将特别关注反馈相互作用。假设河床形态对河道内过程起着重要的控制作用，从而影响泥沙输沙速率和输沙途径的时空分布。地层的摩擦成分被认为是主动的，而不是被动的。这最终会对通道稳定性产生重要影响。这项工作的关键方面是根据河流系统中可用流体动力的拖曳分割观点来评估沉积物的输送过程。一份详细的流速剖面、沉积物输送速率和底部结构的研究将在科罗拉多的格林河收集。这些数据将在“本地”和“空间”框架内进行分析。研究结果将对泥沙输运预测能力和床型存在场产生新的认识。

Kammerer, Martin T U. of Southern California The research is directed toward an improved understanding of process-response interactions within river channels. Specifically, the spatial distribution and temporal evolution of bottom roughness elements and sediment transport rates will be examined with particular focus on feedback interactions. It is hypothesized that bedforms exert important controls on in-channel processes and thereby influence the spatial and temporal distribution of sediment transport rates and pathways. Frictional components of bedforms are viewed as active, rather than passive. This ultimately has important ramifications for channel stability. The crucial aspect of the work is to evaluate sediment transport processes in light of a drag-partitioned view of the fluid power available in a river system. A detailed study of velocity profiles, sediment transport rates and bottom configuration will be collected in the Green River of Colorado. The data will be analyzed within 'local' and 'spatial' frameworks. The results will yield new understanding of sediment transport predictive capabilities and bedform existence fields.