Research On Rainfall Simulation Of WRF Model With Different Physical Process Scheme

Global wanning leads to extreme weather, climate events and frequent disasters, particularly changes the time and space rainfall distribution pattern significantly, and all the changes make a major impact to human environment. Droughts and other extreme weather disasters occur because of the uneven spatial and temporal distri-bution of precipitation. Rainfall is an important hydrological phenomenon, the basic aspect of the process water cycle, and the basic source of a region. Precipitation is the basic parameters of the water balance equation. Rainfall is the source of river runoff and supply source of groundwater in an area. In research and practical work of the hydrology and water resources, the analysis and calculation of rainfall is given great attention all the time. In this paper, the WRF mesoscale model is use to simulate a heavy rainfall in Shanxi Province. Quantitative characteristics of the rainfall, temporal and spatial distribution of rain area and the process of moving were recei-ved. For the scale model in the hydrology and water resources applications, meso--scale model physics research and simulation of rainfall are significant.The main contents are:(1)In this paper we comprehensively introduced kinds of micro-physical processes, cumulus convection parameterization, land surface process, boundary layer parameters and the radiation scheme of the WRF model.(2) 12 different micro-physical processes in the experimental program were designed to simulated a typical rainfall of Shanxi Province. Accumulating rainfall splash zone map, the time of each rainfall station, the cumulative rainfall and other parameters of all the processes, and the results were compared with the measured data.(3) 5 different cumulus of the experimental program were designed to simulated a typical rainfall of Shanxi Province. Rainfall splash zone map, the time of each rainfall station, the cumulative rainfall and other parameters were accumulated, and the results were compared with the measured date.Through experimental analysis, comparison of the various microphysical processes and cumulus effect of simulated rainfall showed that different microphysical processes make a greater impact on rainfall simulation. The rainfall simulation of various micro-physics scheme for the four stations of the simulation results are not uniform, the simulation results of Linxian, Fangshan and Loufan are significantly better than the Gujiao station;In the five cumulus parameterization schemes, only BMJ program significantly improved the results of simulated rainfall; and BMJ program also has the same result that the simulation results of Linxian, Fangshan and Loufan are significantly better than the Gujiao station.