To address compatibility issues between meteorological and hydrological models in two-way land-atmosphere coupling,a highly efficient WRF/Grid-XAJ two-way coupling system was constructed based on the principle of mass conservation using soil moisture as a linkage.Analysis of two flood events in the Tunxi catchment revealed the following:the model weight parameter quantitatively assessed the compatibility of hydro-meteorological model coupling;after precipitation assimilation,the two-way coupling system slightly outperformed the WRF(Weather Research and Forecasting)model in peak precipitation accuracy(error is within±5％);the two-way coupling system more accurately reflected soil moisture;both the two-and one-way coupling systems underestimated the hydrographs before precipitation assimilation;after assimilation,their simulation results improved and closely matched those of the Grid-XAJ model(all Nash-Sutcliffe efficiency coefficients ENS＞0.85),with the two-way coupling system showing the best peak flood simulation results(error is within±11％).This demonstrates that the WRF/Grid-XAJ two-way coupling system has the potential to promote the simulation and forecasting of rainstorms and floods,offering a new perspective for two-way feedback modeling between hydrological and meteorological models.
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