Sediment Thickness Calculations

Introduction

Geocap can do the Article 76 sediment thickness calculations on sediment thickness grids and sediment thickness profiles.

A sediment thickness grid is a grid with sediment thickness in Z value. Sediment thickness points and sediment thickness profiles are point data with sediment thickness as scalar value. The Z value is ignored and can be zero, or for example the depth at this point.

In this section:

Generate > 1% distance to FOS area

Using foot of slope points, Geocap can calculate which points contain thicker sediments than 1% of the distance to the nearest foot of slope point. It can also calculate sediments thicker than a threshold, which can be relevant in UNCLOS work with article 76, Annex II (Bengal rule).

All this functionality is available under the Generate > 1% distance to FOS area command which can be found on the "Sediment thickness" schema. This command object has two modes:

Sediments > 1% of distance to FOS
You can select which foot of slope data set to use by pressing the browse button, and browsing in a single FOS point, or a collection of FOS points. You can also specify another percentage and select which distance calculation method to use.

Geocap will only extract the sediment points which have a thickness that is more than the specified percentage of distance to the closest FOS point.

If you choose to map the result, the colors will represent the thickness in percent of the distance to the foot of slope.

Sediments > thickness threshold
In this mode, you can specify the sediment thickness threshold. Geocap will extract the sediment points thicker than this threshold.

The result of these calculations can be stored in the project, and/or mapped in the display window. You select what to do with the output by checking of the check buttons. You can also specify where you want to store your output in the project. If no output folder is set, the output will be stored in a default folder (3.Sediment Data / Sediment Thickness Points).