Can the application of a multi‐objective evolutionary algorithm improve conveyance estimation?

Abstract

The following work explores the possibility of applying an evolutionary algorithm (NSGA-II) to automate the calibration procedure of a quasi 2-D numerical model. Seven rivers are examined, with discharges and flow depths ranging from 6 to 450 m 3 /s and 0.49 to 3.69 m, respectively. The calibration procedure is based on matching lateral distributions of depth-mean velocity, for which data exist. The results are compared with simulations undertaken by an expert user using traditional calibration techniques. The new approach compares favourably with the expert user and is able to provide an insight into the optimum calibration parameters, from which further scientific knowledge could be developed.

River hydraulics – a view from midstream

“…Until such work is undertaken, this will inevitably limit the application of this type of model. Recent work by Sharifi et al (2009Sharifi et al ( , 2010 on the application of evolutionary computation to open-channel modelling, and by Chlebek and Knight (2006), indicate that it is possible to investigate numerically the physical parameters more thoroughly than hitherto. The use of 2D and 3D models poses particular difficulties with respect to calibration.…”