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A cost-effective approach to predict dynamic variation of mesohabitats at the river scale in Norwegian systems

ABSTRACT This paper presents a cost-effective approach to predict dynamic variation of mesohabitat classes or hydromorphological units (HMUs) in the context of a peaking scenario. Predicting dynamic mesohabitats has been a challenge in the last 20 years. This is mainly due to the fact that mesohabitat changes do not show a simple relationship with varying discharges. The HMUs Simulation Method, by using a one-dimensional hydraulic model as a basis, proved to be a promising tool to simulate HMUs at four varying discharges in a Norwegian river. Low flows and surface pattern criteria were the most challenging to simulate and best modelling results were achieved for the higher flows. Further development on this approach should follow, but at present the method shows promising results towards the prediction of dynamic HMUs at the river scale.