Wave-formed ripples in sandy sediments – Background and review of simple models for prediction of ripple geometry

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Authors
  1. Crawford, A.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
This report gives an overview of some of the relevant concepts of sand ripple formation and geometry, in the context of seabed imaging by the sidescan sonar systems typically used in mine countermeasures (MCM) survey applications. The presence of a rippled background complicates the process of detecting seabed objects in the sonar imagery, due to the distortion of the acoustic shadows that are cast. Some understanding of the natural ranges of the geometric properties of sand ripples (wavelength, height, orientation) under typical environmental conditions could help with interpretation of sidescan sonar imagery. A simple empirical model, developed by Soulsby and Whitehouse based on a compilation of decades of published and unpublished observations, is compared to several models considered to be benchmarks in the research community. Predicted ripple geometry could be used to infer seabed properties (e.g. sediment size), or in development of accurate seabed simulations.

Il y a un résumé en français ici.

Keywords
Battlespace Characterization;seabed ripples;modelling
Report Number
DRDC-RDDC-2019-R042 — Scientific Report
Date of publication
01 May 2019
Number of Pages
22
DSTKIM No
CA049458
CANDIS No
810231
Format(s):
Electronic Document(PDF)

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