Tidal-induced large-scale regular bed form patterns in a three-dimensional shallow water model

被引:194
作者
Hulscher, SJMH
机构
[1] UNIV UTRECHT, INST MARINE & ATMOSPHER RES, UTRECHT, NETHERLANDS
[2] DELFT HYDRAUL, NL-8300 AD EMMELOORD, NETHERLANDS
关键词
D O I
10.1029/96JC01662
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The three-dimensional model presented in this paper is used to study how tidal currents form wave-like bottom patterns. Inclusion of vertical flow structure turns out to be necessary to describe the formation, or absence, of all known large-scale regular bottom features. The tide and topography are treated as a coupled system, and the potential free instabilities in this system are investigated. A linear stability analysis is used to study the dynamics of bed forms. This yields information on the role of physical mechanisms; such information cannot be obtained by direct numerical nonlinear simulation. The basic state represents a horizontal elliptical flow, veering in vertical direction, over a flat bottom. It is shown that in such a system, modes can grow which have characteristics of both tidal sand banks and sand waves. The model predictions are compared with observations and show good agreement.
引用
收藏
页码:20727 / 20744
页数:18
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