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Creating/Calculating 3D Subsurface Geology Volumes

Question asked by jamato2000 on Apr 20, 2017
Latest reply on Apr 21, 2017 by GSCUser85

Hey All,


I have a question in regards to calculating subsurface geology volumes. Im working on trying to create 3D model of some beach ridges. For those that don’t know.. a beach ridge is a wave-swept or wave-deposited ridge running parallel to a shoreline. These packages of sediment have subsurface geometries that wedge-out at a ~5° dip lake-ward (please see photo links below).


I know how to calculate the surface volumes of the ridges, but am having trouble figuring out a way to create and calculate the volume of the wedges that pinch out below the surface. I don’t have any info on the extent or depth of the wedges (no borehole data), just trying to model the data off that ~5° dip lake-ward.


Is this a possibility in ArcMap/ArcScene or do I need the assistance of third party software like ( or ( I attempted to import a DEM into Sketchup but was having issues converting my DEM in ArcMap to the .dem / .ddf files that Sketchup allows. I also just tried to model things in Sketchup w/o the DEM and still had tremendous difficulty with the complex shapes involved.


Any feedback/insight would be greatly appreciated! Thanks


Orthophoto of study area:
ArcScene 3D photo w/ vertical exaggeration:
ArcMap polygon outlines:
Rough cross-section sketch of beach ridges: