Small scale bedform types off the south-holland coast

Journal article (2016)

Authors

Saulo Meirelles Coastal Engineering - CEG
M. Henriquez Coastal Engineering - CEG
Alejandro J. Souza National Oceanography Center
Alexander R. Horner-Devine University of Washington
J.D. Pietrzak Environmental Fluid Mechanics - CEG
S. Rijnsburger Environmental Fluid Mechanics - CEG
M.J.F. Stive Coastal Engineering - CEG
Research Group
Coastal Engineering (CEG) (TU Delft)
Sand Engine Bedform classification Wave-current bedforms
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Published Date

01-03-2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Coastal Engineering

Abstract

This study presents the small scale bedform states found off the South-Holland coast during a 31+ days field observation of seabed acoustic imagery and near the bed velocities. Six main bed states were encountered: current ripples (C), wave ripples (W), combined wave-current ripples (WC), current ripples with subordinate wave ripples (Cw), wave ripples with subordinate current ripples (Wc) and poorly developed ripples (P). Direct visual detection of the bed state from the images showed good agreement with a simple predictor based on the mobility number. The most frequent type of bedform was C which is governed by the tidal currents. Wave ripple prevailed only during a storm with waves higher than 2 m. The combined Cw, WC and Wc types comprised 22% of the occurrences. Poorly developed ripples were associated with the neap tide during fair weather conditions.