Gravel Parameterization Schemes and its Regional Assessment on Tibetan Plateau Using RegCM4

In this study, the impact of gravel was taken into account in regional climate model version 4.7, which driven by ERA-Interim with a resolution 1.5 km numerical experiment. The parameterization schemes and original soil hydrothermal were used simulations on Tibetan Plateau (TP), respectively. performance two simulating moisture (SM) assessed. Moreover, three areas selected terms distribution content TP to investigate differences internal mechanism between schemes. SM is generally improved compared that simulation effect superior southeastern TP. Except for TP, temporal variations below depth 1.0 m still needs be improved. fractional saturated area (fsat) fraction inundated (fh2osfc) are pivotal variables control important component hydrologic process. There may threshold increase fh2osfc, when fh2osfc lower than value, main increasing reduce surface is, divided input soil. However, higher bottom drainage from water store. will induce decreasing mineral hydraulic conductivity, leads increases, opposite true.