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<p>This study examined how topography modulated rainfall over the Yangtze–Huaihe River Valley during the extreme Meiyu event of 4th–9th July 2020. The spatio–temporal distribution of rainfall from the control simulation compared well against observations. Three mountains were flattened in a sensitivity simulation. Local changes of accumulated rainfall exceeded ± 400&#xa0;mm, the change of domain mean was minor (0.9&#xa0;mm), indicating that topography redistributed rainfall. Composite diurnal cycles indicated that topography modulated the diurnal cycle of convective development and impacted rainfall location in the form of upstream enhancement, downstream suppression. The changes of domain–mean rainfall remained minor in three individual mountain–flattening simulations. The discrepancy between the summed changes of the simulations and all mountain flattening suggests nonlinear interactions among the mountains.</p>

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Topographic Impacts on the Diurnal Cycle of Convection During the July 2020 Heavy Rainfall Event in the Yangtze–Huai River Valley

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月30日

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  • Ling Tong,
  • Tetsuya Takemi,
  • Shao-Yi Lee

摘要

This study examined how topography modulated rainfall over the Yangtze–Huaihe River Valley during the extreme Meiyu event of 4th–9th July 2020. The spatio–temporal distribution of rainfall from the control simulation compared well against observations. Three mountains were flattened in a sensitivity simulation. Local changes of accumulated rainfall exceeded ± 400 mm, the change of domain mean was minor (0.9 mm), indicating that topography redistributed rainfall. Composite diurnal cycles indicated that topography modulated the diurnal cycle of convective development and impacted rainfall location in the form of upstream enhancement, downstream suppression. The changes of domain–mean rainfall remained minor in three individual mountain–flattening simulations. The discrepancy between the summed changes of the simulations and all mountain flattening suggests nonlinear interactions among the mountains.