Bridging the Gap Between Sediment Transport and the Evolution of Complex Morphology

摘要9424507帕克明尼苏达州泥沙输移与河流形态关系的研究主要涉及三个问题。第一部分是对以交替沙洲为主的砾石河床河流的形态推移质关系的追求。数值、实验和现场工作的结合将被用来从砾石运输的局部关系转变为固有地包括这种杆状结构的全球关系。第二种与河流为主的冲积扇的形成有关。在这里，理论和实验相结合，通过对个别分流河道的考虑，获得冲积扇结构和演化的机理、预测模型。这项工作将由可用的现场数据加以补充。第三个主题是循环步骤。这种新发现的床形头饰和滑槽和水池地貌。实验将与理论相结合，以完整地解释所讨论的形式。

ABSTRACT CTS-9424507 PARKER MINNESOTA This research deals with three problems involving the relation between sediment transport and stream morphology. The first consists of the pursuit of a morphologic bedload relation for gravel-bed rivers dominated by alternate bars. A combination of numerical, experimental and field work will be used to move from a local relation for gravel transport to a global one that inherently includes that bar structure. The second is concerned with the formation of fluvially-dominated alluvial fans. Here theory and experiment are to combined to obtain a mechanistic, predictive model of alluvial fan structure and evolution from considerations of the individual distributary channels. The work will be augmented by avaiable field data. The third topic is cyclic steps. This newly-recognized bedform headcuts and chute-and-pool topography. Experiments will be combined with theory for a complete explanation of the form in question.