Dynamics of Flow-Sediment Interaction

在地形均匀和非均匀的河床形态中，将采用实验和建模相结合的方法来研究沉积物的运输和流动特性。将涉及三个领域：河床力学、河床输运和悬浮输运。理论方面涉及发展一个模型，其中包括泥沙床的流动和侵蚀的耦合。一个新颖的特点是利用一个移动带来固定一个移动的沙丘，以便进行实验观测。对洋流和河流中沉积物运输的预测仍然不可靠，而且是基于有限数据的经验主义；这项调查将促进理解和预测能力。

A combined experimental and modeling approach will be utilized in an investigation of sediment transport and flow characteristics over topographically uniform and nonuniform bed forms. Three areas will be addressed: bedform mechanics, bedload transport, and suspended load transport. The theoretical aspects involve development of a model which includes the coupling of flow and erosion of the sediment bed. A novel feature is the utilization of a moving belt to hold a migrating dune in place for experimental observations. Predictions of sediment transport by ocean currents and in rivers is still unreliable and based on empiricism from limited data; this investigation will adavance understanding and predictive capabilities.