Abstract
Tidal sand ridges are large-scale rhythmic bedforms that are observed on the offshore parts of shelf seas where sand is abundantly available. Spacings between successive ridges are several kilometres, they evolve on centennial time scales, and their crests are cyclonically rotated with respect to the direction of the principal tidal currents. Here, an overview will be presented of the current knowledge about these ridges with respect to their manifestation in different seas, their observed behaviour, the basic mechanisms that explain their initial formation and their evolution towards finite heights and the ability to model them. It will be shown that both tides, waves and changes in mean sea level have a profound impact on the evolution of the ridges.
Highlights
This review focuses on linear and nonlinear dynamics of tidal sand ridges in the offshore area of shelf seas
A shelf sea is a body of water, with depths of 0–200 m, which extends from the shoreline to the seaward end of the continental shelf, the shelf break
This contribution has provided an overview of current knowledge about the linear and nonlinear dynamics of tidal sand ridges
Summary
This review focuses on linear and nonlinear dynamics of tidal sand ridges in the offshore area of shelf seas. 1.1 the general geographical and physical aspects of shelf seas are introduced. 1.2 different types of bedforms that are observed on the outer continental shelves of these seas are briefly described. Tidal sand ridges are considered, where in Sect. 1.3 their relevance is discussed and an overview of subsequent sections is given
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