Abstract
Abstract. This study aims at evaluating the performances of flash-flood forecasts issued from deterministic and ensemble meteorological prognostic systems. The hydrometeorological modeling chain includes the Weather Research and Forecasting Model (WRF) forcing the rainfall-runoff model MARINE dedicated to flash floods. Two distinct ensemble prediction systems accounting for (i) perturbed initial and lateral boundary conditions of the meteorological state and (ii) mesoscale model physical parameterizations have been implemented on the Agly catchment of the eastern Pyrenees with three subcatchments exhibiting different rainfall regimes. Different evaluations of the performance of the hydrometeorological
strategies have been performed: (i) verification of short-range ensemble
prediction systems and corresponding streamflow forecasts, for a better
understanding of how forecasts behave; (ii) usual measures derived from a
contingency table approach, to test an alert threshold exceedance; and (iii) overall evaluation of the hydrometeorological chain using the continuous rank probability score, for a general quantification of the ensemble performances. Results show that the overall discharge forecast is improved by both ensemble strategies with respect to the deterministic forecast. Threshold
exceedance detections for flood warning also benefit from large
hydrometeorological ensemble spread. There are no substantial differences
between both ensemble strategies on these test cases in terms of both the
issuance of flood warnings and the overall performances, suggesting that
both sources of external-scale uncertainty are important to take into
account.
Subject
General Earth and Planetary Sciences
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