CN113570102A - System and method for analyzing radius of asymmetric maximum precipitation falling area of typhoon - Google Patents
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Abstract
The invention provides an analysis system and an analysis method for the radius of an asymmetric maximum precipitation falling area of typhoon, which is characterized by comprising the following steps: the typhoon basic data acquisition module is used for determining the central position and the maximum wind speed radius of the typhoon; the rainfall data acquisition module is used for acquiring rainfall data near the typhoon center; the precipitation data processing module is used for performing Fourier decomposition; the coordinate conversion module is used for carrying out coordinate conversion and calculating 1-4 wave asymmetric precipitation components based on the maximum wind speed radius; the azimuth angle determining module is used for determining the falling area azimuth angle of the maximum value of the 1-4 wave asymmetric precipitation of the typhoon; the rotating module is used for rotating the falling area of the maximum value of the 1-4-wave asymmetric precipitation to the east direction; and the result calculation module is used for obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius. The method has the advantage of distinguishing the radius of the asymmetric maximum precipitation falling area of the typhoon with different maximum wind speed radii, and the diagnosis result of the typhoon precipitation structure is clearer and more accurate.
Description
Technical Field
The invention relates to an analysis system and an analysis method for a typhoon precipitation structure, in particular to an analysis system and an analysis method for the radius of an asymmetric maximum precipitation falling area of typhoon.
Background
Typhoon (TC) is used as a carrier of rainstorm, and is often used for bringing disasters such as large-area waterlogging, flood, debris flow and the like to places where the typhoon passes through. Typhoon precipitation can be divided into two parts: axisymmetric precipitation and asymmetric precipitation. Wherein, the axisymmetric precipitation can be understood as the average precipitation distribution of the typhoon; asymmetric precipitation may characterize and understand the maximum precipitation drop zone of a typhoon. The previous researches on axial symmetry and asymmetric distribution of landing typhoon precipitation focus on the influence of external large-scale environment, sea-land difference, typhoon movement, strength and the like on precipitation distribution, and representative research works on analysis of a maximum precipitation area comprise the following steps:
1) lonfat et al (2004, see reference 1) studied the relation between the distribution of typhoon rainfall at sea and TC intensity, geographical location and movement, and found that the maximum rainfall was located at the TC front quadrant on average over the world, but varied with the TC intensity.
2) Chen et al (2006, see reference 2) analyzed the asymmetry of marine TC rainfall with respect to ambient vertical wind shear, and found that the asymmetry of rainfall was significantly affected by VWS when ambient Vertical Wind Shear (VWS) was greater than 5m s-1.
3) Yu et al (2015, see reference 3; 2017, see reference 4), the asymmetry of precipitation of landing typhoon is researched, the asymmetric distribution structure of landing typhoon precipitation is mainly controlled by the intensity of environmental vertical wind shear, and a conceptual model is provided for the LTC precipitation distribution mechanism influenced by sea-land difference.
Because the influence of an environmental field, an underlying surface, typhoon intensity and movement on typhoon precipitation distribution is emphasized, on the analysis method of the typhoon asymmetric maximum precipitation area, the conventional research and analysis technology mainly comprises the step of carrying out Fourier decomposition to obtain 1-wave low-wave-number asymmetric precipitation components, on one hand, the structure of the typhoon is not considered, and on the other hand, 1-wave and higher-wave asymmetric precipitation total quantity distribution is not given.
Reference documents:
reference 1: lonfat, M., F.D. Marks Jr., and S.S. Chen, 2004: Precipitation distribution in vertical cycles using the chiral Rainfall Measuring session (TRMM) microwave image r: A global permanent. Monthly Weather Review, 132, 1645-.
Reference 2: chen, S., J.A. Knaff, and F.D. Marks, 2006 Effects of vertical with skin and storm motion on vertical cyclic assay from TRMM. Monthly Weather Review, 134, 3190. cake 3208, https:// doi.org/10.1175/MWR3245.1.
Reference 3: yu, Z, Y, Wang, and H, Xu, 2015, object rain analysis in geographic cycles creating and testing device China, 54, 117 and 136, https:// doi.org/10.1175/JAMC-D-13-0359.1.
Reference 4: yu, Z, Y, Wang, H, Xu, N.E. Davidson, Y, Chen, and H.Yu, 2017, On the relationship between the intension and the raiofall distribution in the geographic cycles of the animal and human over China, Journal of Applied methodology and clinical, 56, 2883. sup. 1, https:// doi. org/10.1175/JAMC-D-16-0334.1.
Disclosure of Invention
In order to overcome the inadaptability of the previous research on the typhoon precipitation structure monitoring and analyzing technology, the invention provides an analysis technology of the radius of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius. The TC maximum wind speed radius is an important physical parameter describing the TC distribution structure. Aiming at the problem that the existing analysis system and method are not combined with the structure of typhoon, the invention combines the maximum wind speed radius of the typhoon to calculate the 1-4 wave asymmetric precipitation components, removes the azimuth angle phase difference of the maximum precipitation area with different wave numbers and sums the difference, thereby modifying and improving the method and realizing the analysis of the radius of the maximum precipitation area asymmetric to the typhoon with the maximum wind speed radius.
Specifically, the invention provides an analysis system for the radius of an asymmetric maximum precipitation falling area of typhoon, which is characterized by comprising the following steps:
the typhoon basic data acquisition module determines the typhoon center position and the maximum wind speed radius according to time;
the rainfall data acquisition module is used for acquiring satellite rainfall data, and acquiring rainfall data near a typhoon center from the satellite rainfall data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
the rainfall data processing module is used for performing Fourier decomposition on the rainfall data provided by the rainfall data acquisition module and calculating 1-4 wave asymmetric rainfall components relative to the typhoon center distance;
the coordinate conversion module is used for carrying out coordinate conversion based on the data provided by the rainfall data processing module and calculating the 1-4 wave asymmetric rainfall component based on the maximum wind speed radius;
5) the azimuth angle determining module is used for determining the falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained by the coordinate conversion module;
the rotating module is used for respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation to the east direction according to the azimuth found by the azimuth determining module on the basis of the data obtained by the coordinate conversion module;
and the result calculation module is used for calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data processed by the rotation module, and finally obtaining the typhoon asymmetric maximum precipitation falling area radius based on the maximum wind speed radius. The radius refers to the distance from the center of TC.
Preferably, the system for analyzing the radius of the asymmetric maximum precipitation landing zone of the typhoon is characterized in that the center position and the maximum wind speed radius of the typhoon are determined by interpolation from the data of the optimal path of the typhoon in the current international meteorological service standard, or the center position and the maximum wind speed radius of the typhoon are directly obtained by a satellite and a radar.
Preferably, the system for analyzing the radius of the asymmetric maximum precipitation drop zone of the typhoon is characterized in that the data time resolution of the center position of the typhoon and the radius of the maximum wind speed is 6 hours.
Preferably, the analysis system for the radius of the asymmetric maximum precipitation zone of the typhoon is characterized in that the satellite precipitation data obtains relevant data through the China weather bureau, and the content of the adopted satellite precipitation data is hourly satellite inversion precipitation products.
Preferably, the analysis system for the radius of the asymmetric maximum precipitation zone of the typhoon is characterized in that the precipitation data processing module judges the obtained precipitation data by adopting a quality control means after obtaining the satellite precipitation data, performs error elimination on the data samples to enable the data samples to be qualified under the condition that the data are judged to be in short of measurement or in error, and finishes analysis under the condition that the data are not qualified.
The invention also provides an analysis method for the radius of the asymmetric maximum precipitation falling area of the typhoon, which is characterized by comprising the following steps of:
1) determining the center position and the maximum wind speed radius of the typhoon according to time, thereby acquiring basic typhoon data;
2) acquiring satellite precipitation data, and acquiring precipitation data near the center of the typhoon from the satellite precipitation data according to the time in the step 1) and the acquired center position of the typhoon;
3) performing Fourier decomposition on the precipitation data obtained in the step 2), and calculating 1-4 wave asymmetric precipitation components relative to the distance from the center of the typhoon;
4) carrying out coordinate conversion based on the data obtained in the step 3), and calculating 1-4 wave asymmetric precipitation components based on the maximum wind speed radius;
5) determining a falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained in the step 4);
6) on the basis of the data obtained in the step 4), respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation obtained by processing to the east direction according to the azimuth found in the step 5);
7) and 6) calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data obtained in the step 6), and finally obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius.
Preferably, in step 1), the typhoon center position and the maximum wind speed radius are determined by interpolation from typhoon optimal path data of the current international meteorological service standard, or the typhoon center position and the maximum wind speed radius are directly obtained by a satellite or a radar.
Preferably, the method for analyzing the radius of the asymmetric maximum precipitation drop zone of the typhoon is characterized in that the time resolution of the data of the center position of the typhoon and the radius of the maximum wind speed is 6 hours.
Preferably, the analysis method for the radius of the asymmetric maximum precipitation zone of the typhoon is characterized in that satellite precipitation data obtains relevant data through the China weather bureau, and the content of the adopted satellite precipitation data is hourly satellite inversion precipitation products.
Preferably, the method for analyzing the radius of the asymmetric maximum precipitation drop zone of the typhoon is characterized in that the step 2) further comprises the following steps: and after the satellite precipitation data are obtained, judging the obtained precipitation data by adopting a quality control means, carrying out error elimination on the data samples to enable the data samples to be qualified under the condition that the data are judged to be missing or wrong, and finishing analysis under the condition that the data are not qualified.
Compared with the prior art, the method has the advantages that a coordinate conversion module, an azimuth angle determination module, a rotation module and a result calculation module are added, and steps 4-7 are carried out. Compared with the prior art, the technical scheme of the invention has the following advantages:
compared with the prior art, the invention has the following advantages:
the method for analyzing the radius of the asymmetric maximum precipitation falling area of the typhoon based on the maximum wind speed radius fully considers that the distribution of the asymmetric maximum precipitation falling area of the typhoon is different due to the difference of the maximum wind speed radius of the typhoon, has the advantage of distinguishing the radius distribution of the asymmetric maximum precipitation falling area of the typhoon with different maximum wind speed radii compared with the traditional method, and can provide an effective means for the diagnosis and analysis of the typhoon precipitation structure. In addition, the invention considers the different phases of the typhoon maximum precipitation areas with different wave numbers on the azimuth angle, so that the diagnosis result of the typhoon precipitation structure is clearer and more accurate, and the practical application is more convenient. In addition, the algorithm adopted by the system and the method can realize automatic and efficient operation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to derive other drawings without creative efforts.
FIG. 1 is a flow chart of an analysis system for an asymmetric maximum precipitation zone of a typhoon according to the present invention.
Fig. 2 is a schematic diagram of the maximum precipitation distribution of 1 wave typhoon relative to the center distance of the typhoon according to the embodiment of the invention.
FIG. 3 is a schematic diagram of the maximum precipitation distribution of 1-wave typhoon based on the maximum wind speed radius according to the embodiment of the invention.
FIG. 4 is a schematic diagram of the maximum precipitation distribution of 1-wave typhoon obtained based on the maximum wind speed radius after rotation according to the embodiment of the invention.
FIG. 5 is a schematic diagram of the radius distribution of the maximum precipitation area of the typhoon based on the maximum wind speed radius according to the embodiment of the invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. The embodiments in the present invention, other embodiments obtained by persons skilled in the art without any inventive work, belong to the protection scope of the present invention.
FIG. 1 is a flow chart of an analysis system for the radius of the asymmetric maximum precipitation zone of a typhoon according to the present invention. As shown in fig. 1, the present invention provides an analysis system for radius of asymmetric maximum precipitation drop area of typhoon, which is characterized in that the system comprises:
the typhoon basic data acquisition module determines the typhoon center position and the maximum wind speed radius according to time;
the typhoon center position and the maximum wind speed radius can be obtained by interpolation according to the typhoon optimal path data of the current international meteorological service standard, and the information such as the typhoon center position (longitude and latitude), the maximum wind speed radius (km) and the like can also be directly obtained by methods such as satellites, radars and the like. The temporal resolution of these data is determined by the observation means employed or the raw data itself, typically 6 hours, but in practical analysis methods a data temporal resolution of 6 hours is not necessary.
The rainfall data acquisition module is used for acquiring satellite rainfall data, and acquiring rainfall data near a typhoon center from the satellite rainfall data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
the satellite precipitation data can be obtained by, for example, the China weather service. In one embodiment, the precipitation data is used to invert precipitation products from hourly satellites.
If necessary, after the satellite precipitation data are obtained, the obtained precipitation data are judged by adopting a quality control means, and under the condition that the data are judged to be missing or wrong, the analysis is finished or the data samples are mistakenly eliminated.
The rainfall data processing module is used for performing Fourier decomposition on the rainfall data provided by the rainfall data acquisition module and calculating 1-4 wave asymmetric rainfall components relative to the typhoon center distance;
in one embodiment, according to the typhoon center position obtained by the typhoon basic data acquisition module, carrying out Fourier decomposition on rainfall within a radius range of 1500km away from the typhoon center to obtain 1-4 wave asymmetric rainfall components within 1500km away from the typhoon center; the 1500km is a 1500km radius range determined after the maximum wind speed radius is calculated by 10 times in consideration of the possible range of the maximum wind speed radius.
The coordinate conversion module is used for carrying out coordinate conversion based on the data provided by the rainfall data processing module and calculating the 1-4 wave asymmetric rainfall component based on the maximum wind speed radius;
and after considering the maximum wind speed radius of the typhoon, performing coordinate conversion, and converting the 1-4 wave asymmetric precipitation component within 1500km of the distance from the center of the typhoon into the 1-4 wave asymmetric precipitation component of the maximum wind speed radius of 0-10 times.
After considering the maximum wind speed radius of the typhoon, coordinate conversion is carried out, and 1-4 wave asymmetric precipitation components of the distance (namely under longitude and latitude coordinates) relative to the center of the typhoon are converted into 1-4 wave asymmetric precipitation components of the maximum wind speed radius of 0-10 times.
5) The azimuth angle determining module is used for determining the falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained by the coordinate conversion module;
in order to determine the radius of the maximum precipitation area and remove the azimuth difference of the maximum precipitation area decomposed by different wave numbers, the azimuth phase of the next module needs to be removed. Therefore, a falling area of the maximum value of the 1-wave asymmetric precipitation component relative to the maximum wind speed radius of 0-10 times is searched, and the azimuth angle of the falling area is found; accordingly, the falling zone azimuth angle of the maximum value of the asymmetric precipitation component of the 2-4 waves is found respectively.
The rotating module is used for respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation to the east direction according to the azimuth found by the azimuth determining module on the basis of the data obtained by the coordinate conversion module;
rotating the falling area azimuth of the maximum value of the 1-wave asymmetric precipitation component to the east direction according to the falling area azimuth of the maximum value of the 1-wave asymmetric precipitation component found by the azimuth determination module; correspondingly, according to the landing zone azimuth angle of the maximum precipitation of 2, 3 and 4 waves, corresponding rotation processing is also carried out.
The result calculation module calculates the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data processed by the rotation module, and finally obtains the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius
The invention also provides an analysis method for the radius of the asymmetric maximum precipitation falling area of the typhoon, which comprises the following steps:
1) determining the center position and the maximum wind speed radius of the typhoon according to time, thereby acquiring basic typhoon data;
the typhoon center position and the maximum wind speed radius can be obtained by interpolation according to the typhoon optimal path data of the current international meteorological service standard, and the information such as the typhoon center position (longitude and latitude), the maximum wind speed radius (km) and the like can also be directly obtained by methods such as satellites, radars and the like. The temporal resolution of these data is determined by the observation means employed or the raw data itself, typically 6 hours, but in practical analysis methods a data temporal resolution of 6 hours is not necessary.
2) Acquiring satellite precipitation data, and acquiring precipitation data near the center of the typhoon from the satellite precipitation data according to the time in the step 1) and the acquired center position of the typhoon;
the satellite precipitation data can obtain relevant data through the China weather service bureau, and after the satellite precipitation data is obtained, the most basic quality control means is adopted for the obtained satellite precipitation data before the step 3) is carried out, wherein the most basic quality control means mainly comprises the steps of judging whether the satellite precipitation data is missing or wrong, and removing the data samples;
the satellite precipitation data can be obtained by, for example, the China weather service. In one embodiment, the precipitation data is used to invert precipitation products from hourly satellites.
If necessary, after the satellite precipitation data are obtained, the obtained precipitation data are judged by adopting a quality control means, and under the condition that the data are judged to be missing or wrong, the analysis is finished or the data samples are mistakenly eliminated.
3) Performing Fourier decomposition on the precipitation data obtained in the step 2), and calculating 1-4 wave asymmetric precipitation components relative to the distance from the center of the typhoon;
in one embodiment, according to the typhoon center position obtained in the step 1), carrying out Fourier decomposition on rainfall within a radius range of 1500km away from the typhoon center to obtain 1-4 wave asymmetric rainfall components within 1500km away from the typhoon center;
4) carrying out coordinate conversion based on the data obtained in the step 3), and calculating 1-4 wave asymmetric precipitation components based on the maximum wind speed radius;
and after considering the maximum wind speed radius of the typhoon, performing coordinate conversion, and converting the 1-4 wave asymmetric precipitation component within 1500km of the distance from the center of the typhoon into the 1-4 wave asymmetric precipitation component of the maximum wind speed radius of 0-10 times.
And after considering the maximum wind speed radius of the typhoon, performing coordinate conversion, and converting the 1-4 wave asymmetric precipitation component of the longitude and latitude coordinate relative to the distance between the center of the typhoon into the 1-4 wave asymmetric precipitation component of the maximum wind speed radius of 0-10 times.
5) Determining a falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained in the step 4);
in order to conveniently determine the radius of the maximum precipitation area and remove the azimuth difference of the maximum precipitation area decomposed by different wave numbers, the azimuth phase removal operation in the step 6) needs to be performed. Therefore, a falling area of the maximum value of the 1-wave asymmetric precipitation component relative to the maximum wind speed radius of 0-10 times is searched, and the azimuth angle of the falling area is found; accordingly, the falling zone azimuth angle of the maximum value of the asymmetric precipitation component of the 2-4 waves is found respectively.
6) On the basis of the data obtained in the step 4), respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation obtained by processing to the east direction according to the azimuth found in the step 5);
rotating the falling area azimuth of the maximum value of the 1-wave asymmetric precipitation component found in the step 5) to enable the falling area azimuth of the maximum value of the 1-wave asymmetric precipitation to be in the east-righting direction; correspondingly, according to the landing zone azimuth angle of the maximum precipitation of 2, 3 and 4 waves, corresponding rotation processing is also carried out.
7) And 6) calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data obtained in the step 6), and finally obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius.
In view of the above, the present invention provides an analysis technique for the radius of the asymmetric maximum precipitation drop area of the typhoon based on the maximum wind speed radius, including: acquiring 1-4 wave asymmetric precipitation distribution within a range of 0-10 times of the maximum wind speed radius from the center of the typhoon by utilizing a Fourier decomposition method according to the maximum wind speed radius of the typhoon; analyzing the position of the maximum precipitation falling area of the 1-4 waves; calculating the azimuth deviation from the east-righting direction according to the obtained 1-4 wave maximum precipitation falling area azimuth; and rotating the 1-4 wave maximum precipitation area to the east direction, so that azimuth angle deviations of the typhoon maximum precipitation areas with different wave numbers are completely eliminated, and the radius distribution of the typhoon asymmetric maximum precipitation areas based on the maximum wind speed radius is obtained. The invention fully considers the difference of the internal structures of the typhoons, which causes the difference of the radius distribution of the asymmetric maximum precipitation falling area of 1-4 waves, and is reflected in the precipitation result of the analysis.
Examples
Specifically, taking the typhoon precipitation No. 15 (1415) in 2014 as an example, the implementation process of the typhoon asymmetric maximum precipitation zone radius analysis technology based on the maximum wind speed radius according to the embodiment of the present invention is specifically described:
1) path data of a typhoon activity record No. 1415 is acquired, and the path data includes longitude, latitude, maximum wind speed radius and the like. The typhoon historical data is derived from a tropical cyclone optimal path data set of a tropical cyclone data center (tcdata. typhoon. org. cn) of Shanghai typhoon institute of China weather service in the northwest Pacific ocean in 1949 to 2019 and an American JTWC optimal path data set;
2) obtaining historical rainfall data of No. 1415 typhoon, wherein satellite rainfall data is derived from lattice rainfall estimation data provided by the national information center of the China weather Bureau, and missing or wrong related sample data is removed;
3) and performing Fourier decomposition on the typhoon precipitation data of No. 1415, and calculating 1-4 wave asymmetric precipitation components relative to the distance from the center of the typhoon. In the concrete operation, according to the longitude and the latitude of the center position of the No. 1415 typhoon, Fourier decomposition is carried out on precipitation within the radius range of 1500km from the center of the typhoon to obtain 1-wave asymmetric precipitation component (shown in figure 2) within 1500km from the center of the typhoon, and then 2-wave asymmetric precipitation components, 3-wave asymmetric precipitation components and 4-wave asymmetric precipitation components (not shown in figure) are respectively obtained. Fig. 2 is a schematic diagram of the maximum precipitation distribution of 1 wave typhoon relative to the center distance of the typhoon according to the embodiment of the invention. This figure also shows the maximum precipitation distribution of 1-wave typhoon obtained by the conventional analysis method such as Yu. Wherein the color scale represents 1-wave asymmetric precipitation distribution (darkest represents the maximum precipitation drop zone) relative to the longitude and latitude physical coordinates. The X and Y axes represent longitude and latitude degrees from the center of the typhoon, and (0, 0) represents the center of the typhoon.
4) And (3) carrying out coordinate conversion on the result of the step 3), and respectively converting the 1-4 wave asymmetric precipitation components of the longitude and latitude coordinates relative to the typhoon center distance into the 1-4 wave asymmetric precipitation components relative to the maximum wind speed radius of 0-10 times. FIG. 3 is a schematic diagram of the maximum precipitation distribution of 1-wave typhoon based on the maximum wind speed radius according to the embodiment of the invention. Where the color scale is 1 wave asymmetric precipitation distribution relative to the maximum wind speed radius (the darkest indicates the maximum precipitation drop zone). The X, Y axes represent the maximum wind speed radius multiple from the typhoon center, and (0, 0) represents the typhoon center.
5) Searching the maximum value of 1-wave asymmetric precipitation component relative to the maximum wind speed radius of 0-10 times, and finding out the azimuth angle of the maximum value; accordingly, the azimuth angle of the maximum value of the asymmetric precipitation component of the 2-4 waves is found respectively.
6) Respectively rotating the falling area direction of the maximum value of the 1-4 wave asymmetric precipitation to the east direction. Specifically, the 1-wave asymmetric precipitation component maximum azimuth angles found in the step 5) are azimuthally rotated to the east (see fig. 4). FIG. 4 is a schematic diagram of the maximum precipitation distribution of 1-wave typhoon obtained based on the maximum wind speed radius after rotation according to the embodiment of the invention. Where the color scale is 1 wave asymmetric precipitation distribution relative to the maximum wind speed radius (the darkest indicates the maximum precipitation drop zone). The X, Y axes represent the maximum wind speed radius multiple from the typhoon center, and (0, 0) represents the typhoon center. Fig. 4 shows the effect achieved by this step. Similarly, the rotation process is performed again for the 2, 3, 4 wave precipitation maximum azimuth (not shown).
7) And obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius.
According to the step 6), calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius, and finally obtaining the typhoon maximum precipitation area radius distribution based on the maximum wind speed radius (see figure 5). FIG. 5 is a schematic diagram of the radius distribution of the maximum precipitation area of the typhoon based on the maximum wind speed radius according to the embodiment of the invention. FIG. 5 shows the sum of 1-4 waves of typhoon asymmetric precipitation based on the maximum wind speed radius after rotation. Where the color scale is the 1-4 wave total asymmetric precipitation distribution relative to the maximum wind speed radius (the darkest indicates the maximum precipitation drop zone). The X, Y axes represent the maximum wind speed radius multiple from the typhoon center, and (0, 0) represents the typhoon center.
The analysis technology of the radius of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius can provide an effective means for typhoon precipitation structure analysis.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An analysis system for the radius of the asymmetric maximum precipitation drop zone of a typhoon, comprising:
the typhoon basic data acquisition module determines the typhoon center position and the maximum wind speed radius according to time;
the rainfall data acquisition module is used for acquiring satellite rainfall data, and acquiring rainfall data near a typhoon center from the satellite rainfall data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
the rainfall data processing module is used for performing Fourier decomposition on the rainfall data provided by the rainfall data acquisition module and calculating 1-4 wave asymmetric rainfall components relative to the typhoon center distance;
the coordinate conversion module is used for carrying out coordinate conversion based on the data provided by the rainfall data processing module and calculating the 1-4 wave asymmetric rainfall component based on the maximum wind speed radius;
the azimuth angle determining module is used for determining the falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained by the coordinate conversion module;
the rotating module is used for respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation to the east direction according to the azimuth found by the azimuth determining module on the basis of the data obtained by the coordinate conversion module;
and the result calculation module is used for calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data processed by the rotation module, and finally obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius, wherein the radius is the distance from the position of the center of the TC.
2. The system for analyzing the asymmetric maximum precipitation landing zone radius of the typhoon as claimed in claim 1, wherein the typhoon center position and the maximum wind speed radius are determined by interpolation from the typhoon best path data of the current international meteorological service standard, or the typhoon center position and the maximum wind speed radius are directly obtained by satellite and radar.
3. The system for analyzing the asymmetric maximum precipitation zone radius of a typhoon according to claim 1, wherein the data time resolution of the typhoon center position and the maximum wind speed radius is 6 hours.
4. The system for analyzing the radius of the asymmetric maximum precipitation zone of typhoon according to claim 1, wherein the satellite precipitation data is obtained by the China weather service, and the content of the satellite precipitation data is hourly satellite inversion precipitation products.
5. The system for analyzing the radius of the asymmetric maximum precipitation drop zone of the typhoon according to claim 1, wherein the precipitation data processing module judges the obtained precipitation data by adopting a quality control means after obtaining the satellite precipitation data, performs error elimination on the data samples to enable the data samples to be qualified under the condition that the data are judged to be missing or wrong, and finishes analysis under the condition that the data are not qualified.
6. An analysis method for the radius of an asymmetric maximum precipitation falling area of typhoon is characterized by comprising the following steps:
1) determining the center position and the maximum wind speed radius of the typhoon according to time, thereby acquiring basic typhoon data;
2) acquiring satellite precipitation data, and acquiring precipitation data near the center of the typhoon from the satellite precipitation data according to the time in the step 1) and the acquired center position of the typhoon;
3) performing Fourier decomposition on the precipitation data obtained in the step 2), and calculating 1-4 wave asymmetric precipitation components relative to the distance from the center of the typhoon;
4) carrying out coordinate conversion based on the data obtained in the step 3), and calculating 1-4 wave asymmetric precipitation components based on the maximum wind speed radius;
5) determining a falling area azimuth angle of the maximum asymmetric precipitation value of the typhoon 1-4 waves relative to the maximum wind speed radius in the data obtained in the step 4);
6) on the basis of the data obtained in the step 4), respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation obtained by processing to the east direction according to the azimuth found in the step 5);
7) and 6) calculating the sum of the rotated 1-4 wave asymmetric precipitation components based on the maximum wind speed radius by using the data obtained in the step 6), and finally obtaining the radius distribution of the typhoon asymmetric maximum precipitation falling area based on the maximum wind speed radius.
7. The method for analyzing the asymmetric maximum precipitation landing zone radius of the typhoon, according to claim 6, wherein in the step 1), the typhoon center position and the maximum wind speed radius are determined by interpolation from the typhoon optimal path data of the current international meteorological service standard, or the typhoon center position and the maximum wind speed radius are directly obtained through a satellite or a radar.
8. The method for analyzing the asymmetric maximum precipitation zone radius of the typhoon according to claim 6, wherein the data time resolution of the typhoon center position and the maximum wind speed radius is 6 hours.
9. The method of claim 6, wherein the satellite precipitation data is obtained from the China weather service, and the content of the satellite precipitation data is hourly satellite inversion precipitation products.
10. The method for analyzing the radius of the asymmetric maximum precipitation zone of the typhoon according to claim 6, wherein the step 2) further comprises the following steps: and after the satellite precipitation data are obtained, judging the obtained precipitation data by adopting a quality control means, carrying out error elimination on the data samples to enable the data samples to be qualified under the condition that the data are judged to be missing or wrong, and finishing analysis under the condition that the data are not qualified.
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