Response to Williams (2010) on Gard (2009): Comparison of spawning habitat predictions of PHABSIM and River2D models

摘要

Williams (2010) raises a number of interesting points with regard to the testing of instream flow models. Before responding to the critique and suggestions of Williams (2010), I note several inaccuracies in Williams (2010). River2D does not divide the study area into cells. River2D calculates depths and velocities at nodes of the triangulated irregular network, and then interpolates between the surrounding nodes to calculate depths and velocities at any given location. There are two types of two-dimensional (2D) hydraulic models - finite element and finite difference (Steffler and Blackburn 2002).