With both grab sampling equipment and a vibrocore system available to carry out this type work in-house, we have well-established relationships with accredited laboratories to oversee the sample analysis and reporting process. See our Environmental pages for more information. Prior to any dredging works taking place it is usual to retrieve grab samples or sediment cores of the material to be dredged and to have this analysed in a UKAS accredited laboratory. Analysis is commonly required to determine the physical and chemical properties of the dredge material, a pre-requisite for any dredge licence application. This approach is far superior to previous sectional methods, allowing a very well defined measure of the material removed or built up between survey and design model or between successive surveys. It is routinely accepted that data sets at 0.5m post spacing are issued as a standard output for dredging works, which is then used to create a very detailed 3D difference model between the current survey and the dredge model, referred to as an isopachyte, used in the calculation of dredge volumes. Modern multibeam surveys provide a detailed 3D model of the seabed. In the image shown above Left, each of the coloured areas represents a different dredge level in a relatively complex dredging campaign, with the software used to calculate side slopes at any desired angle between areas of differing levels. Equipped with software enabling 3D dredge models to be created, we can provide detailed and accurate volume calculations, quantify the amount of material removed and show areas of accretion or erosion.
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