Historical rainfall retrieval method based on mesoscale numerical atmospheric model and high resolution
A high-resolution, high-resolution technique applied in the field of high-resolution historical rainfall inversion
Active Publication Date: 2019-01-18
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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However, due to the driving data and the cumulative error of calculation, although the rainfall simulated by the mesoscale numerical atmospheric model has certain spatial distribution information, there is a certain difference between the rainfall information and the actual rainfall process. How to make full use of the mesoscale numerical atmospheric model Atmospheric models generate spatial information of rainfall data, and at the same time improve the difference between total rainfall and actual rainfall, and obtain high-resolution rainfall data, which is a key issue in hydrological simulation. At the same time, high-resolution rainfall information is also an error in land-atmosphere coupling research. Requirements for Attribution Analysis
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[0030] Combine below Figure 1 to Figure 3 , the present invention is further described:
[0031] Such as figure 1 As shown, a high-resolution historical rainfall inversion method based on mesoscale numerical atmospheric model and rainfall station includes the following steps:
[0032] Step 1: Determine the scope of the study area, the rainfall events to be studied and the resolution of the rainfall data to be obtained, and collect the coordinate information of the rainfall stations in the study area and the measured rainfall information of the rainfall events to be studied;
[0033] Step 2: Set the basic parameters of the mesoscale numerical atmospheric model, in which the size of the innermost grid is consistent with the resolution of the rainfall data to be obtained, drive the mesoscale numerical atmospheric model, and obtain the output rainfall data;
[0034] Step 3: According to the location of the rainfall station in the study area, use geographic information software ...
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The invention relates to a high-resolution historical rainfall retrieval method based on a mesoscale numerical atmospheric model and high resolution, which comprises the following steps of: determining the resolution of rainfall data, rainfall output of the mesoscale numerical atmospheric model, dividing a control unit, calculating a correction coefficient and correcting rainfall data. Through themodification scheme of the invention, on the one hand, the resolution information of the rainfall output data of the mesoscale numerical atmospheric model in space is reserved, and the spatial distribution law of rainfall is reflected. On the other hand, the control area of each rainfall station is divided by Tyson polygon method. The grid within the control area of a rainfall station belongs tothe rainfall station, and the simulated grid rainfall is corrected by the measured rainfall information of the rainfall station. From the initial time of rainfall, the surface rainfall at each time isbased on the measured data of rainfall station, and the mesoscale numerical atmospheric model is used to output the rainfall space proportional distribution to different size grids, which can ensurethat the surface rainfall on each control surface is equal to the measured rainfall.
Description
technical field [0001] The invention relates to a method for generating spatial rainfall data, in particular to a high-resolution historical rainfall inversion method based on a mesoscale numerical atmospheric model and a rainfall station. Background technique [0002] Rainfall data is the most critical factor driving hydrological simulation, and accurate rainfall information is the prerequisite for obtaining good hydrological simulation results. The actual rainfall has a certain spatial resolution information. This spatial resolution information not only affects the peak discharge, peak time and total runoff, but also affects the uncertainty of model parameter estimation. If the rainfall information is obtained from the rainfall station, a Thiessen polygon needs to be generated during the simulation process, and the rainfall data in each polygon is represented by the rainfall station data in the polygon. Such a processing method loses the spatial distribution information o...
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IPC IPC(8): G06F16/29G06F17/50
CPCG06F30/20
Inventor 刘佳李传哲王洋田济扬邱庆泰郝斯佳于新哲焦裕飞刘昱辰
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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