The authors have detailed a range of modifications in light of the reviewers comments and I am content with the changes made in that they address all the technical aspects of the reviews and now provide a sufficiently robust justification for the choices made in the analysis. Some of the new text is however cumbersome with a range of grammatical errors and repetition (see example below) present. I therefore recommend publication subject to a final clean version behind provided and a careful final editorial only review. I would encourage the authors to carefully read through the paper (particularly the newer sections and check for presentation.

EXAMPLE: "Ideally, we would want to assess the degree to which an estuary is in equilibrium from an aerial photograph, because this is often the only data available. However, the only indicator derivable from aerial photography is channel width and thus deviation from a converging width profile."

The auths have dealt with the remaining issues and as such, in my view, this paper is now ready for publication.
Daniel R. Parsons

Dear Authors,
Thank you for your submission to ESurf. I am now delighted to inform you that it has been accepted for final publication. Thank you for all your hard work with the changes and edits to the paper.
All the best,
Tom Coulthard