Scale-selective Validation of Morphodynamic Models

Scale-selective Validation of Morphodynamic Models

Bosboom, J.
Reniers, A.J.H.M.

Civil Engineering and Geosciences

Hydraulic Engineering

2014-06-15

Although it is generally acknowledged that the practical predictability at smaller scales may be limited, output of high-resolution morphodynamic area models is mostly presented at the resolution of the computational grid. The so- presented fields typically are realistic looking, but not necessarily of similar quality at all spatial scales. Unfortunately, commonly used single-number validation measures do not provide the necessary guidance as to which scales in the output can be considered skilful. Also, differences in skill throughout the model domain cannot be discerned. Here, we present a new, scale-selective validation method for 2D morphological predictions that provides information on the variation of model skill with spatial scale and within the model domain. The employed skill score weighs how well the morphological structure and variability are simulated, while avoiding the double penalty effect by which point-wise accuracy metrics tend to reward the underestimation of variability. The method enables us to tailor model validation to the study objectives and scales of interest, establish the resolution at which results are ideally presented and target model development specifically at certain morphological scales.

morphodynamic modelling
model validation
spatial scales
local statistics
skill
ICCE 2014

http://resolver.tudelft.nl/uuid:cb7b35ea-9b5e-4053-a78d-b48924e63b8b

Coastal Engineering Research Council

978-0-9896611-2-6

ICCE 2014: Proceedings of 34th International Conference on Coastal Engineering, Seoul, Korea, 15-20 June 2014

Institutional Repository

conference paper

(c) 2014 The Author(s)