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A new type of sea bed waves
Author(s) -
Knaapen Michiel A. F.,
Hulscher Suzanne J. M. H.,
Vriend Huib J.,
Stolk Ad
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012007
Subject(s) - bathymetry , geology , echo sounding , depth sounding , oceanography , bedform , crest , tidal range , waves and shallow water , wavelength , sediment transport , geomorphology , estuary , sediment , physics , optoelectronics , quantum mechanics
Sandy beds of shallow tidal seas often exhibit a range of rhythmic patterns, from small‐scale ripples a few metres long to large tidal sandbanks with a wavelength of kilometres. For example, on the access route to Rotterdam harbour ships cross a field of sandwaves. The crests of these sandwaves determine the effective navigation depth. To warrant navigability, the North Sea Directorate of the Netherlands Ministry of Transport, Public Works and Water Management continually monitors the bathymetry in the sandwave area, originally using echo sounding. Our analysis of these data has revealed a new rhythmic pattern, in addition to the well‐known sandwaves and tidal sandbanks. The wavelength of this new pattern, labelled here as long bedwaves, is three times the one of sandwaves, and the crest orientation is different. Interference of the three modes leads to the rather complex bathymetry revealed by echo soundings.