Brasington et al.'s (2012) ToPCAT algorithm can be run on high-density point clouds from within the GCD software. In addition, we provide a ToPCAT Preparation tool to help prepare your data for input into ToPCAT.
Brasington, J., D. Vericat, and I. Rychkov. 2012. Modeling river bed morphology, roughness, and surface sedimentology using high resolution terrestrial laser scanning. Water Resources Research 48. DOI: 10.1029/2012wr012223.