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。具体地说，将审查海底粗糙度要素和泥沙输移率的空间分布和时间演变，特别注重反馈相互作用。假定河床形态对河道内过程起着重要的控制作用，从而影响输沙率和输沙路径的时空分布。床模的摩擦部件被认为是主动的，而不是被动的。这最终会对渠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阻力分区视图来评估泥沙输送过程。将在科罗拉多州的格林河收集详细的速度剖面、沉积物输移率和海底形态的研究。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移预测能力和河床存在域有新的认识。

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.