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ASSESSMENT OF THREE HYDROLOGICAL ROUTING MODELS COUPLED TO THE SURFEX LAND SURFACE MODEL (ISBA SCHEME): AN EXAMPLE OF VARBITSA RIVER BASIN IN BULGARIA
Abstract
The article is about three hydrological river routing models (RRM) implemented in Bulgaria, coupled to a land surface model (LSM), mainly for flood forecasting purpose. For the evaluation of the three RRMs the authors use a river basin of Mediterranean climate - the Varbitsa River with catchment area of 1200 km2. The river is prone to dangerous flash floods because of their fast propagation. LSM SURFEX (Surface Externalisee) but formally the integrated part ISBA (Interface Soil Biosphere Atmosphere) is used to compute the moisture and energy fluxes over land, including: the surface runoff, ground and snow water storage, and deep drainage. The authors describe the river routing methods, the implementation and the results of three alternative distributed hydrological models used to accumulate and propagate the runoff and to compute streamflow at scales from the river reach to the river basin. MODCOU (Modele hydrogeologique couple), coupled with ISBA, is the first distributed hydrological model implemented for Varbitsa River basin. The river routing part of MODCOU, based on the notion of isochronous zones, is considered. At second place, the authors describe the routing part of TOPODYN based on TOPMODEL that was included in SURFEX version 7.2 for better simulation of Mediterranean flash floods. The third described RRM coupled to SURFEX is RAPID (Routing Application for Parallel computation of Discharge). The models are applied for the period 04.2020 to 03.2021 that contains several high flow peaks and a dry period. Simulated streamflow discharges with the three RRMs are compared to the measured river flow at two hydrological stations with nested catchments. The comparison is not exhaustive as the three RRMs are coupled to different versions of ISBA-SURFEX. Authors do not emphasise at statistical scores of model results but aim to give an overview of scientific and computational features of each of the river routing methods, with special attention to representation of high flow peaks. The simulations with the three coupled applications of LSM and RRM over the considered period show greater differences for the smaller considered catchment and rather similar results for the larger one.
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