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I currently have an aerial photograph of a barrier beach, and corresponding LiDAR data for the 2005 photo, 2007 photo, and 2013 photo.

I want to calculate the volume of sediment on the beach for each year above sea level. There are various guides but I am still confused how to do this for just the area of beach I have, and not the whole area of LiDAR. The LiDAR files are tiff.

I am using ArcMap 10.2.2.

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One approach: you can clip a raster with a tool from your toolboxes, Data Management -> Raster -> Raster Processing. There are various routes with for getting volume, but if you have raster data you can use the Surface Volume tool.

You should also understand the error associated with your LiDAR derived raster and the estimates of volume and how that impacts your results.

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