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Articles

1983: Vol. LX, No. 2

Dredging Control by Hydrographic Soundings

Submitted
August 6, 2015
Published
2015-07-30

Abstract

Where dredging work is to be undertaken, measurement “in situ ” by hydrographic sounding may constitute an excellent basis for payment to the contractor, if the natural sediment movement is negligible compared with the volume to be dredged, and if the thickness of the material to be dredged is too dense to allow for the uncertainty concerning soundings. As a general rule, requirements such as least and maximum depths to be attained, channel model, tolerance, are imposed for dredging areas, and hydrographic soundings are the only available means to assess that these requirements are being met; hence the importance of sounding accuracy. The purpose of this note is to make some comments on this type of measurement by hydrographic sounding and on precautions to be taken in order to ensure its reliability ; these comments appear under three headings :  -measurement of water-depth -position of the survey launch -data processing.