Modelling the Ob River, in Western Siberia, Using Remotely Sensed DEM and Altimetry Data
Biancamaria, S.1; Bates, P.2; Boone, A.3; Mognard, N.1; Cretaux, J.1
1LEGOS; 2School of Geographical Sciences, University of Bristol; 3GAME/CNRM Meteo-France

Global warming is expected to be the most significant in the boreal regions, which could greatly affect the discharge regime of arctic rivers. Yet a modification in the arctic hydrological cycle could then have a feedback on the whole earth climate through increased input of fresh water into the arctic ocean. Thus, being able to model major arctic rivers, and therefore predict how they may respond to global warming, is a crucial issue.

The aim of this work is to model such an arctic river and in particular we consider the Ob River, in Western Siberia. This has been achieved by coupling the land surface scheme ISBA (Interactions between Soil, Biosphere and Atmosphere) developed by the CNRM (Centre National de Recherche Meteorologique, France) with the flood inundation model LISFLOOD-FP developed by the University of Bristol, UK. Using this coupled macroscale hydrology-hydraulic model the Ob discharge has been simulated and compared to in-situ gauge and satellite data. This comparison has been analysed and some assumptions have been made to explain difference between simulated and observed discharge. Finally many sensitivity tests have been made to verify these assumptions and improve the modelling.


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