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An optimized radar data assimilation method

A radar data and radar technology, applied in the field of optimized radar data assimilation, to achieve the effect of assimilation efficiency and improvement of simulation or forecast accuracy

Active Publication Date: 2018-03-13
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are very few studies on the assimilation of weather radar data and its application in the field of hydrology. How to improve the assimilation efficiency and accuracy of radar data is a problem that needs to be solved

Method used

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  • An optimized radar data assimilation method
  • An optimized radar data assimilation method
  • An optimized radar data assimilation method

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Experimental program
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Embodiment 1

[0027] This embodiment is an optimized radar data assimilation method, the process of which is as follows figure 1 shown. The steps of the method described in this embodiment are as follows:

[0028] 1) The steps of radar data collection and preprocessing: used to collect two kinds of radar basic data, reflectivity and radial velocity, and convert the radar basic data into a data format that can be assimilated by WRF mode to form radar data .

[0029] The type of radar described in this embodiment is a weather radar, and currently commonly used weather radars are S-band and C-band Doppler radars. The original radar data is the basic data processed and archived by the signal processor after the receiver receives the echo signal, including three main information: reflectivity, radial velocity and frequency spectrum, among which the reflectivity and radial velocity can be calculated by WRF Pattern assimilation.

[0030] 2) The step of radar data layering: it is used to layer ...

Embodiment 2

[0043] This embodiment is an improvement of the first embodiment, and is a refinement of the time interval for acquiring data by the radar in the embodiment. The time interval for the radar in this embodiment to acquire data is 6 minutes.

[0044] This embodiment is the time interval between two body scans of a Doppler weather radar. Since this time value is an integer divisor of the conventional 60-ary time system, it is very convenient for the calculation of time, and other values ​​are used. There is no such advantage.

Embodiment 3

[0046] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the setting of the passing time interval. The shortest time interval described in this embodiment is 30 minutes, and the longest time interval is 6 hours.

[0047] Setting the assimilation time interval is related to the time interval of radar acquisition data, and the interval between two body scans of various radars is slightly different. For example: a Doppler weather radar is used to obtain data every 6 minutes. The initial field required for the operation of the numerical atmospheric model WRF obtains data every 360 minutes (6 hours). Considering that the time for the WRF model to assimilate and obtain rainfall simulation or forecast results is generally about 30 minutes (due to the performance of the server, the server The higher the performance, the shorter the time, and vice versa, the longer the time), therefore, the assimilation...

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Abstract

The invention relates to an optimized radar data assimilation method. The method comprises the following steps: carrying out collection and pretreatment on radar data; carrying out radar data layering; carrying out assimilation design of radar data under different time intervals; establishing a radar data assimilation scheme; calculating average relative error of each layer of radar data; selecting an optimum radar data layer; carrying out analysis; and selecting optimal assimilation time. Through atmosphere layering and accuracy control of the time interval in obtaining the radar detection data, from the angle of improving radar data assimilation precision and efficiency, improvement of assimilation efficiency is realized under the condition of ensuring the assimilation precision as far as possible; and through radar data assimilation, rainfall simulation or forecast accuracy can be greatly improved, so that sufficient time can be provided for decision makers to accurately make flood early-warning pre-arranged plans and reservoir regulation schemes and the like, and the method has important theoretical and practical significance in meteorological and hydrological departments.

Description

technical field [0001] The invention relates to an optimized radar data assimilation method, which is a method for processing hydrological and meteorological data, and a method for processing radar detection data. Background technique [0002] The formation process and occurrence of rainfall are affected by many aspects such as large-scale atmospheric circulation, ocean currents, sea and land positions, topography, underlying surface, and human activities. There are many uncertainties in the cumulative rainfall and the temporal and spatial distribution of rainfall. Therefore, precipitation is one of the most difficult meteorological elements to simulate or forecast by numerical atmospheric models. [0003] Meteorological radar is a device that can provide meteorological data over the ground with a horizontal coverage of about 400-600 kilometers in a local area. The provided meteorological data has the characteristics of high resolution and accuracy. On the one hand, the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 刘佳李传哲田济扬于福亮王洋邱庆泰聂汉江
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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