Author(s): Q. Jiang; A. Watanabe; M. Isobe

Linked Author(s):

Keywords: No Keywords

Abstract: In many coastal and estuary areas across the world the beds are mainly covered with cohesive sediments, often referred to as mud. Typical muddy coasts are found in Southeast Asia, China and the United State. Siltation is a very serious problem in this kind of areas where the transport of cohesive sediments is much different from that of noncohesive sediments. In general cases, the mass transport of soft mud due to waves is quantitatively predominant and thus governs the morphological changes of mud bed. On the other hand, the rheological properties of mud plays an important role on the physical phenomena in the water-mud system However, most of the rheological models used so far, for instance, vis-cous, visco-elastic, visco-plastic, and visco-elastic-plastic models, are constituted from assumptions or simple shear experiments. Therefore, the emphasis of this study is placed upon providing further insights into the rheological properties of mud under waves, and investigating its effects on the wave attenuation and mud mass transport. Based upon a large numbers of experiments, an empirical rheological model is proposed and then a two-dimensional numerical model of bed mud motion is developed. The caleulated wave height change and vertical profile of mud mass transport velocity are compared with the measurements.

DOI:

Year: 1995