ERSC 4P10 Lecture Notes - Lecture 3: Silt
22 Jan 2016
School
Department
Course
Professor
Document Summary
Like unidirectional flows, oscillating flows produced by waves result in an ordered sequence of different bed forms. Before examining this sequence we will consider the classic wave formed bed form wave ripples or symmetrical ripples . Another name for these structures is two dimensional wave ripples , Characterized by: symmetrical profile, peaked crests and broad troughs (more pronounce peaks in fine-grained sediment), straight, bifurcating crests. The oscillating current acts at right angles to the crest of the ripples. Ripple crests are parallel to the wave crests so that, on average, they are aligned parallel to the shoreline at the time of formation. Ripple crest orientation is useful in determining paleoshoreline. The sequence of bed forms under unidirectional flows. Like unidirectional flow bed forms, under oscillatory flows the type of bed form changes in a predicatable manner with increasing flow strength (e. g. , um).
