CN113570102B - Analysis system and analysis method for typhoon asymmetric maximum precipitation falling area radius - Google Patents
Analysis system and analysis method for typhoon asymmetric maximum precipitation falling area radius Download PDFInfo
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Abstract
The invention provides an analysis system and an analysis method for a typhoon asymmetric maximum precipitation landing zone radius, wherein the system is characterized by comprising the following steps: the typhoon basic data acquisition module is used for determining the center position and the maximum wind speed radius of typhoons; the precipitation data acquisition module acquires precipitation data near the typhoon center; the precipitation data processing module expands 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 asymmetric precipitation maximum value of typhoons 1-4 waves; the rotation module rotates to enable the falling area azimuth of the 1-4 wave asymmetric precipitation maximum value to be in the forward eastern direction; and the result calculation module is used for obtaining typhoon asymmetric maximum precipitation falling area radius distribution based on the maximum wind speed radius. The invention has the advantage of judging the radius of the asymmetric maximum precipitation landing zone of typhoons with different maximum wind speed radiuses, 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 of a typhoon precipitation structure, in particular to an analysis system and an analysis method of a typhoon asymmetric maximum precipitation landing zone radius.
Background
Typhoons (TC) are used as carriers of storm, and often bring disasters such as large-area waterlogging, flood, debris flow and the like to places where the typhoons pass. Typhoon precipitation can be divided into two parts: axisymmetric precipitation and asymmetric precipitation. Wherein axisymmetric precipitation can be understood as the average precipitation distribution of typhoons; asymmetric precipitation may characterize and understand the maximum precipitation landing zone of typhoons. In the past, the research about the axisymmetric and asymmetric distribution of landing typhoon precipitation focuses on the influence of external large-scale environment, sea-land difference, typhoon movement, strength and the like on precipitation distribution, and representative research work about the analysis of the maximum precipitation landing area comprises the following steps:
1) Lonfat et al (2004, see reference 1) studied the relationship of the offshore typhoon rainfall distribution with TC intensity, geographical location and movement, and found that the maximum rainfall was located in the front quadrant of TC on a global average, but varied with the change in 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 when ambient Vertical Wind Shear (VWS) is greater than 5m s-1, the asymmetry of the rainfall was significantly affected by VWS.
3) Yu et al (2015, see reference 3;2017, see reference 4) researches the precipitation asymmetry of landing typhoons, finds that the landing typhoons precipitation asymmetry distribution structure is mainly controlled by the intensity of vertical wind shear of the environment, and provides a conceptual model for the LTC precipitation distribution mechanism affected by sea-land difference.
Because the influence of environmental fields, underlying surfaces, typhoon intensity and movement on typhoon precipitation distribution is focused, in the analysis method of the typhoon asymmetric maximum precipitation landing area, the traditional research and analysis technology mainly carries out Fourier decomposition to obtain low wave number asymmetric precipitation components of 1 wave, on one hand, the structure of typhoon is not considered, and on the other hand, the total asymmetric precipitation distribution of 1 wave and higher wave numbers is not given.
Reference is made to:
reference 1: lonfat, m., f.d. Marks jr., and s.s. Chen, 2004: precipitation distribution in tropical cyclones using the Tropical Rainfall Measuring Mission (TRMM) microwave image: a global per select, monthly Weather Review, 132, 1645-1660, https:// doi.org/10.1175/1520-0493 (2004) 132<1645: pditcu >2.0.Co;2.
Reference 2: chen, S., J.A. Knaff, and F.D. Marks, 2006: effects of vertical wind shear and storm motion on tropical cyclone rainfall asymmetries deduced from TRMM, monthly Weather Review, 134, 3190-3208, https:// doi.org/10.1175/MWR3245.1.
Reference 3: yu, Z., Y, wang, and H, xu, 2015: observed rainfall asymmetry in tropical cyclones making landfall over China, journal of Applied Meteorology and Climatology, 54, 117-136, 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 intensity and rainfall distribution in tropical cyclones making landfall over China, journal of Applied Meteorology and Climatology, 56, 2883-2901, https:// doi.org/10.1175/JAMC-D-16-0334.1.
Disclosure of Invention
In order to overcome the inadaptability of the past research on typhoon precipitation structure monitoring and analyzing technology, the invention provides an analysis technology of typhoon asymmetric maximum precipitation falling area radius 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 do not combine the structure of typhoon, the invention calculates 1-4 wave asymmetric precipitation components by combining the maximum wind speed radius of typhoon, sums up after removing the azimuth phase difference of the maximum precipitation landing areas with different wave numbers, and further modifies and improves the method to realize the analysis of the asymmetric maximum precipitation landing area radius of typhoon relative to the maximum wind speed radius.
Specifically, the invention provides an analysis system for a typhoon asymmetric maximum precipitation landing zone radius, which is characterized by comprising the following components:
the typhoon basic data acquisition module is used for determining the center position and the maximum wind speed radius of typhoons according to time;
the precipitation data acquisition module is used for acquiring satellite precipitation data and acquiring the precipitation data near the typhoon center from the satellite precipitation data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
the precipitation data processing module is used for carrying out Fourier decomposition on the precipitation data provided by the precipitation data acquisition module and calculating 1-4 wave asymmetric precipitation 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 1-4 wave asymmetric rainfall components based on the maximum wind speed radius;
5) An azimuth angle determining module for determining a falling area azimuth angle of a typhoon 1-4 wave asymmetric precipitation maximum value relative to a maximum wind speed radius in the data obtained by the coordinate conversion module;
the rotation module is used for respectively rotating the azimuth angles found by the azimuth angle determining module on the basis of the data obtained by the coordinate conversion module so as to enable the falling area azimuth of the 1-4 wave asymmetric precipitation maximum value to be in the forward eastern direction;
and 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 typhoon asymmetric maximum precipitation landing zone radius based on the maximum wind speed radius. The radius refers to the distance from the location where the TC center is located.
Preferably, the analysis system of the typhoon asymmetric maximum precipitation landing zone radius is characterized in that the typhoon center position and the maximum wind speed radius are determined by interpolation from typhoon optimal path data of the current international weather service standard, or the typhoon center position and the maximum wind speed radius are directly obtained through satellites and radars.
Preferably, the analysis system for typhoon asymmetric maximum precipitation landing zone radius of the present invention is characterized in that the data time resolution of typhoon center position and maximum wind speed radius is 6 hours.
Preferably, the analysis system of the typhoon asymmetric maximum precipitation landing zone radius is characterized in that the satellite precipitation data material obtains related data through the China weather bureau, and the adopted satellite precipitation data material data content is an hour-by-hour satellite inversion precipitation product.
Preferably, the analysis system of typhoon asymmetric maximum precipitation landing zone radius is characterized in that after satellite precipitation data are obtained, the precipitation data processing module judges the obtained precipitation data by adopting a quality control means, and performs error elimination on the data samples to be qualified under the condition that the data are judged to be in a missing state or an error state, and ends the analysis under the condition that the data are not qualified.
The invention also provides an analysis method of the typhoon asymmetric maximum precipitation landing zone radius, which is characterized by comprising the following steps:
1) Determining the central position of typhoon and the maximum wind speed radius according to time, thereby obtaining typhoon basic data;
2) Acquiring satellite precipitation data information, and acquiring precipitation data information near a typhoon center from the satellite precipitation data information according to the time of the step 1) and the acquired typhoon center position;
3) Expanding Fourier decomposition on the precipitation data obtained in the step 2), and calculating 1-4 wave asymmetric precipitation components of the distance between the center of the typhoon and the precipitation data;
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 the falling area azimuth angle of the maximum asymmetric precipitation value of typhoons 1-4 waves relative to the maximum wind speed radius in the data obtained in the step 4);
6) Based on the data obtained in the step 4), respectively rotating according to the azimuth angle found in the step 5) to enable the falling area azimuth of the maximum value of 1-4 wave asymmetric precipitation to be processed to the forward eastern direction;
7) And 3) 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 typhoon asymmetric maximum precipitation falling area radius distribution based on the maximum wind speed radius.
Preferably, in the method for analyzing the typhoon asymmetric maximum precipitation landing zone radius according to the present invention, in step 1), the typhoon center position and the maximum wind speed radius are determined by interpolation from typhoon best path data of the current international weather service standard, or the typhoon center position and the maximum wind speed radius are directly obtained by satellite and radar.
Preferably, the analysis method of typhoon asymmetric maximum precipitation landing zone radius according to the present invention is characterized in that the data time resolution of the typhoon center position and the maximum wind speed radius is 6 hours.
Preferably, the analysis method of the typhoon asymmetric maximum precipitation landing zone radius is characterized in that the satellite precipitation data material obtains related data through the China weather bureau, and the adopted satellite precipitation data material data content is an hour-by-hour satellite inversion precipitation product.
Preferably, the typhoon asymmetric maximum precipitation landing zone radius analysis method of the present invention is characterized in that step 2) further includes: after satellite precipitation data are obtained, quality control means are adopted to judge the obtained precipitation data, error elimination is carried out on the data samples to be qualified under the condition that the data are judged to be in short measurement or error, and analysis is finished under the condition that the data are not qualified.
Compared with the prior art, the technology of the invention adds a coordinate conversion module, an azimuth angle determination module, a rotation module and a result calculation module, and steps 4-7. 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 landing zone of the typhoon based on the maximum wind speed radius fully considers the difference of the distribution of the asymmetric maximum precipitation landing zone of the typhoon caused by the difference of the maximum wind speed radius of the typhoon, and compared with the prior method, the method has the distinguishing advantage of the distribution of the radius of the asymmetric maximum precipitation landing zone of typhoon with different maximum wind speed radii, and can provide an effective means for the diagnosis and analysis of the precipitation structure of the typhoon. In addition, the invention considers the difference of the phase of the typhoon maximum precipitation landing 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 invention is more convenient for practical application. 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 of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an analysis system of typhoon asymmetric maximum precipitation landing zone according to the present invention.
Fig. 2 is a schematic diagram of a maximum precipitation distribution of 1 wave typhoon with respect to a typhoon center distance according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a maximum precipitation distribution of a 1-wave typhoon obtained based on a maximum wind speed radius according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of maximum precipitation distribution of 1 wave typhoon obtained based on maximum wind speed radius after rotation according to an embodiment of the present invention.
FIG. 5 is a schematic diagram of a typhoon maximum precipitation landing zone radius distribution based on a maximum wind speed radius obtained by an embodiment of the present invention.
Detailed Description
The following is a clear and complete description of the present invention, taken in conjunction with the accompanying drawings, and it is evident that the described embodiments are some, but not all, embodiments of the present invention. Other embodiments of the invention, which are encompassed by the present invention, are within the scope of the invention as would be within the skill of those of ordinary skill in the art without undue burden.
FIG. 1 is a flow chart of the typhoon asymmetric maximum precipitation landing zone radius analysis system of the present invention. As shown in fig. 1, the present invention provides an analysis system for typhoon asymmetric maximum precipitation landing zone radius, which is characterized by comprising:
the typhoon basic data acquisition module is used for determining the center position and the maximum wind speed radius of typhoons according to time;
the typhoon central position and the maximum wind speed radius can be obtained by interpolation according to typhoon optimal path data of the current international meteorological service standard, and information such as typhoon central position (longitude and latitude), maximum wind speed radius (km) and the like can be directly obtained by methods such as satellites and radars. The time resolution of these materials is determined by the observation means employed or the raw data itself, typically 6 hours, but in practical analysis methods, a time resolution of the materials of 6 hours is not necessary.
The precipitation data acquisition module is used for acquiring satellite precipitation data and acquiring the precipitation data near the typhoon center from the satellite precipitation data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
the satellite precipitation data may be obtained by, for example, the chinese weather bureau. And in one embodiment, the content of the precipitation data employed is an hour-by-hour satellite inversion precipitation product.
If necessary, after satellite precipitation data are obtained, quality control means are adopted to judge the obtained precipitation data, and analysis is finished or error elimination is carried out on the data samples under the condition that the data are judged to be in short measurement or error.
The precipitation data processing module is used for carrying out Fourier decomposition on the precipitation data provided by the precipitation data acquisition module and calculating 1-4 wave asymmetric precipitation components relative to the typhoon center distance;
in one embodiment, according to the typhoon center position obtained by the typhoon basic data obtaining module, carrying out Fourier decomposition on precipitation in a radius range of 1500km from the typhoon center to obtain 1-4 wave asymmetric precipitation components within 1500km from the typhoon center; wherein, 1500km is the radius range of 1500km which is determined after calculating 10 times of the maximum wind speed radius considering 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 1-4 wave asymmetric rainfall components based on the maximum wind speed radius;
after the maximum wind speed radius of typhoons is considered, coordinate conversion is carried out, and 1-4 wave asymmetric precipitation components within 1500km of the center distance of the typhoons are converted into 1-4 wave asymmetric precipitation components with respect to 0-10 times of the maximum wind speed radius.
After the maximum wind speed radius of typhoons is considered, coordinate conversion is carried out, and 1-4 wave asymmetric precipitation components corresponding to the center distance of typhoons (namely under longitude and latitude coordinates) are converted into 1-4 wave asymmetric precipitation components corresponding to the maximum wind speed radius of 0-10 times.
5) An azimuth angle determining module for determining a falling area azimuth angle of a typhoon 1-4 wave asymmetric precipitation maximum value relative to a maximum wind speed radius in the data obtained by the coordinate conversion module;
in order to conveniently determine the radius of the largest precipitation landing zone and remove the azimuth difference of the largest precipitation landing zone decomposed by different wave numbers, the azimuth phase of the next module needs to be removed. Therefore, firstly searching 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, and finding the azimuth angle of the falling area; correspondingly, the azimuth angles of the falling areas of the maximum values of the asymmetric precipitation components of the 2-4 waves are found respectively.
The rotation module is used for respectively rotating the azimuth angles found by the azimuth angle determining module on the basis of the data obtained by the coordinate conversion module so as to enable the falling area azimuth of the 1-4 wave asymmetric precipitation maximum value to be in the forward eastern direction;
according to the azimuth angle of the falling area of the maximum value of the 1-wave asymmetric precipitation component found by the azimuth angle determining module, rotating to enable the falling area azimuth of the maximum value of the 1-wave asymmetric precipitation to be in the forward eastern direction; correspondingly, according to the azimuth angles of the falling areas of the maximum values of the precipitation of 2, 3 and 4 waves, corresponding rotation processing is also carried out.
A result calculation module 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 drop zone radius distribution based on the maximum wind speed radius
The invention also provides an analysis method of the typhoon asymmetric maximum precipitation landing zone radius, which comprises the following steps:
1) Determining the central position of typhoon and the maximum wind speed radius according to time, thereby obtaining typhoon basic data;
the typhoon central position and the maximum wind speed radius can be obtained by interpolation according to typhoon optimal path data of the current international meteorological service standard, and information such as typhoon central position (longitude and latitude), maximum wind speed radius (km) and the like can be directly obtained by methods such as satellites and radars. The time resolution of these materials is determined by the observation means employed or the raw data itself, typically 6 hours, but in practical analysis methods, a time resolution of the materials of 6 hours is not necessary.
2) Acquiring satellite precipitation data information, and acquiring precipitation data information near a typhoon center from the satellite precipitation data information according to the time of the step 1) and the acquired typhoon center position;
the satellite precipitation data can obtain relevant data through the China weather department, after the satellite precipitation data are obtained, the most basic quality control means are adopted for the obtained satellite precipitation data before the step 3) is carried out, and the method mainly comprises the steps of judging whether the measurement is lack or wrong and rejecting data samples;
the satellite precipitation data may be obtained by, for example, the chinese weather bureau. And in one embodiment, the content of the precipitation data employed is an hour-by-hour satellite inversion precipitation product.
If necessary, after satellite precipitation data are obtained, quality control means are adopted to judge the obtained precipitation data, and analysis is finished or error elimination is carried out on the data samples under the condition that the data are judged to be in short measurement or error.
3) Expanding Fourier decomposition on the precipitation data obtained in the step 2), and calculating 1-4 wave asymmetric precipitation components of the distance between the center of the typhoon and the precipitation data;
in one embodiment, according to the typhoon center position obtained in the step 1), carrying out Fourier decomposition on precipitation in a radius range of 1500km from the typhoon center to obtain 1-4 wave asymmetric precipitation components within 1500km 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;
after the maximum wind speed radius of typhoons is considered, coordinate conversion is carried out, and 1-4 wave asymmetric precipitation components within 1500km of the center distance of the typhoons are converted into 1-4 wave asymmetric precipitation components with respect to 0-10 times of the maximum wind speed radius.
After the maximum wind speed radius of typhoons is considered, coordinate conversion is carried out, and 1-4 wave asymmetric precipitation components corresponding to the longitude and latitude coordinates of the typhoons center distance are converted into 1-4 wave asymmetric precipitation components corresponding to the maximum wind speed radius of 0-10 times.
5) Determining the falling area azimuth angle of the maximum asymmetric precipitation value of typhoons 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 largest precipitation landing zone and remove the azimuth difference of the largest precipitation landing zone decomposed by different wave numbers, the azimuth phase removing work of the step 6) needs to be carried out. Therefore, firstly searching 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, and finding the azimuth angle of the falling area; correspondingly, the azimuth angles of the falling areas of the maximum values of the asymmetric precipitation components of the 2-4 waves are found respectively.
6) Based on the data obtained in the step 4), respectively rotating according to the azimuth angle found in the step 5) to enable the falling area azimuth of the maximum value of 1-4 wave asymmetric precipitation to be processed to the forward eastern direction;
rotating the azimuth angle of the falling area of the maximum value of the 1-wave asymmetric precipitation component found in the step 5) to enable the azimuth angle of the falling area of the maximum value of the 1-wave asymmetric precipitation component to be in the forward eastern direction; correspondingly, according to the azimuth angles of the falling areas of the maximum values of the precipitation of 2, 3 and 4 waves, corresponding rotation processing is also carried out.
7) And 3) 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 typhoon asymmetric maximum precipitation falling area radius distribution based on the maximum wind speed radius.
In view of the foregoing, the present invention provides an analysis technique for a typhoon asymmetric maximum precipitation landing zone radius based on a maximum wind speed radius, including: obtaining 1-4 wave asymmetric precipitation distribution within a range of 0-10 times of the maximum wind speed radius from the typhoon center according to the maximum wind speed radius of typhoons by utilizing a Fourier decomposition method; analyzing the azimuth of the maximum precipitation landing zone of 1-4 waves; calculating azimuth deviation from the forward eastern direction according to the obtained azimuth of the 1-4 wave maximum precipitation landing zone; and rotating the maximum precipitation landing zone of 1-4 waves to the forward east, so as to completely remove the azimuth deviation of the maximum precipitation landing zone of typhoons with different wave numbers and obtain the typhoons asymmetric maximum precipitation landing zone radius distribution based on the maximum wind speed radius. The invention fully considers that different typhoons have different internal structures, so that the asymmetric maximum precipitation falling area radius distribution of 1-4 waves is different, and the method is reflected in the analyzed precipitation result.
Examples
Specifically, taking No. 15 typhoon precipitation (No. 1415) in 2014 as an example, the implementation process of the typhoon asymmetric maximum precipitation falling area radius analysis technology based on the maximum wind speed radius in the embodiment of the invention is specifically described:
1) Path data for typhoon event record No. 1415 is obtained, including longitude, latitude, maximum wind speed radius, and the like. The typhoon history data is derived from a tropical cyclone best path data set in the North Pacific ocean from 1949 to 2019 provided by the tropical cyclone data center (tcdata. Typhoon. Org. Cn) of the Shanghai typhoon research institute of Meteorological, china;
2) Acquiring 1415 typhoon historical precipitation data, wherein satellite precipitation data is derived from grid point precipitation estimation data provided by the national information center of the Chinese meteorological office, and removing related sample data which are lack of measurement or are wrong;
3) And (3) performing Fourier decomposition on the typhoon precipitation data 1415, and calculating 1-4 wave asymmetric precipitation components of the distance between the typhoon center and the typhoon. In a specific operation, according to the longitude and latitude of the typhoon center position 1415, fourier decomposition is performed on precipitation within a radius range of 1500km from the typhoon center to obtain 1-wave asymmetric precipitation components (see fig. 2) within a distance of 1500km from the typhoon center, and 2, 3 and 4-wave asymmetric precipitation components (not shown) are respectively obtained. Fig. 2 is a schematic diagram of a maximum precipitation distribution of 1 wave typhoon with respect to a typhoon center distance according to an embodiment of the present invention. The figure is also a schematic diagram of the maximum precipitation distribution of 1-wave typhoons obtained by Yu et al in the conventional analysis method. Wherein the color scale represents 1 wave asymmetric precipitation distribution (darkest represents the maximum precipitation landing zone) of the physical coordinates of longitude and latitude. The X and Y axes represent the number of latitudes and longitudes from the typhoon center, and (0, 0) represents the typhoon center.
4) And 3) carrying out coordinate conversion on the result of the step 3), and respectively converting 1-4 wave asymmetric precipitation components of longitude and latitude coordinates corresponding to the typhoon center distance into 1-4 wave asymmetric precipitation components corresponding to 0-10 times of the maximum wind speed radius. Fig. 3 is a schematic diagram of a maximum precipitation distribution of a 1-wave typhoon obtained based on a maximum wind speed radius according to an embodiment of the present invention. Wherein the color scale is 1 wave asymmetric precipitation distribution (darkest color represents the maximum precipitation landing zone) relative to the maximum wind speed radius. The X, Y axis represents 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 components relative to the maximum wind speed radius of 0-10 times, and finding the azimuth angle of the maximum wind speed radius; accordingly, the azimuth angle of the maximum of the asymmetric precipitation component of the 2-4 waves is found, respectively.
6) And respectively rotating the falling area azimuth of the maximum value of the 1-4 wave asymmetric precipitation to the forward eastern direction. Specifically, the maximum azimuth angle of the 1-wave asymmetric precipitation components found by step 5) is azimuthally rotated to the eastern position (see fig. 4). Fig. 4 is a schematic diagram of maximum precipitation distribution of 1 wave typhoon obtained based on maximum wind speed radius after rotation according to an embodiment of the present invention. Wherein the color scale is 1 wave asymmetric precipitation distribution (darkest color represents the maximum precipitation landing zone) relative to the maximum wind speed radius. The X, Y axis represents 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 azimuth angles of maximum values of 2, 3 and 4 wave precipitation (not shown).
7) And obtaining the typhoon asymmetric maximum precipitation landing zone radius distribution based on the maximum wind speed radius.
After 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 landing zone radius distribution based on the maximum wind speed radius (see figure 5). FIG. 5 is a schematic diagram of a typhoon maximum precipitation landing zone radius distribution based on a maximum wind speed radius obtained by an embodiment of the present invention. FIG. 5 shows the sum of the rotated 1-4 wave typhoons asymmetric precipitation based on the maximum wind speed radius. Wherein the color scale is 1-4 wave total asymmetric precipitation distribution relative to the maximum wind speed radius (darkest color indicates the maximum precipitation landing zone). The X, Y axis represents the maximum wind speed radius multiple from the typhoon center, and (0, 0) represents the typhoon center.
The analysis technology of the typhoon asymmetric maximum precipitation landing zone radius based on the maximum wind speed radius can provide an effective means for typhoon precipitation structure analysis.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. An analysis system for typhoon asymmetric maximum precipitation landing zone radius, characterized in that it comprises:
the typhoon basic data acquisition module is used for determining the center position and the maximum wind speed radius of typhoons according to time;
the precipitation data acquisition module is used for acquiring satellite precipitation data and acquiring the precipitation data near the typhoon center from the satellite precipitation data according to the time and the typhoon center position provided by the typhoon basic data acquisition module;
a precipitation data processing module which spreads Fourier decomposition on the precipitation data near the typhoon center provided by the precipitation data acquisition module and calculates 1-4 wave asymmetric precipitation 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 1-4 wave asymmetric rainfall components based on the maximum wind speed radius;
an azimuth angle determining module for determining a falling area azimuth angle of a typhoon 1-4 wave asymmetric precipitation maximum value relative to a maximum wind speed radius in the data obtained by the coordinate conversion module;
the rotation module is used for respectively rotating and processing the data obtained by the module in the coordinate conversion module according to the azimuth angle found by the azimuth angle determination module so as to enable the falling area azimuth of the 1-4 wave asymmetric precipitation maximum value to be in the forward eastern direction;
and 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 typhoon asymmetric maximum precipitation drop zone radius distribution based on the maximum wind speed radius, wherein the radius is the distance from the position of the TC center.
2. The typhoon asymmetric maximum precipitation landing zone radius analysis system according to claim 1, wherein the typhoon center position and maximum wind speed radius are determined by interpolation from typhoon best path data, or the typhoon center position and maximum wind speed radius are obtained directly through satellites and radars.
3. The typhoon asymmetric maximum precipitation landing zone radius analysis system of claim 1, wherein the typhoon center location and maximum wind speed radius data time resolution is 6 hours.
4. The typhoon asymmetric maximum precipitation landing zone radius analysis system according to claim 1, wherein the satellite precipitation data is obtained by a chinese weather bureau, and the adopted satellite precipitation data is an hour-by-hour satellite inversion precipitation product.
5. The typhoon asymmetric maximum precipitation landing zone radius analysis system according to claim 1, wherein the precipitation data processing module is used for judging the obtained precipitation data by adopting a quality control means after obtaining satellite precipitation data, and performing error elimination on the data samples to pass the analysis if the data is judged to be in a missing state or an error state, and ending the analysis if the data is not passed.
6. The method for analyzing the typhoon asymmetric maximum precipitation landing zone radius is characterized by comprising the following steps of:
1) Determining the central position of typhoon and the maximum wind speed radius according to time, thereby obtaining typhoon basic data;
2) Acquiring satellite precipitation data information, and acquiring precipitation data information near a typhoon center from the satellite precipitation data information according to the time of the step 1) and the acquired typhoon center position;
3) Expanding Fourier decomposition on the rainfall data near the typhoon center obtained in the step 2), and calculating 1-4 wave asymmetric rainfall components of the distance between the typhoon center and the data;
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 the falling area azimuth angle of the maximum asymmetric precipitation value of typhoons 1-4 waves relative to the maximum wind speed radius in the data obtained in the step 4);
6) Based on the data obtained in the step 4), respectively rotating and processing the data obtained in the step 4) according to the azimuth angle found in the step 5) so as to enable the falling area azimuth of the 1-4 wave asymmetric precipitation maximum value to be in the forward eastern direction;
7) And 3) 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 typhoon asymmetric maximum precipitation falling area radius distribution based on the maximum wind speed radius.
7. The method according to claim 6, wherein in step 1), the typhoon center position and the maximum wind speed radius are determined by interpolation from typhoon best path data of current international weather service standards, or the typhoon center position and the maximum wind speed radius are obtained directly by satellite and radar.
8. The method for analyzing the radius of a typhoon asymmetric maximum precipitation landing zone 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 for analyzing the radius of the typhoon asymmetric maximum precipitation landing zone according to claim 6, wherein the satellite precipitation data is obtained by a China weather department, and the adopted satellite precipitation data is an hour-by-hour satellite inversion precipitation product.
10. The method of analyzing a typhoon asymmetric maximum precipitation landing zone radius according to claim 6, wherein step 2) further comprises: after satellite precipitation data are obtained, quality control means are adopted to judge the obtained precipitation data, error elimination is carried out on the data samples to be qualified under the condition that the data are judged to be in short measurement or error, and analysis is finished under the condition that the data are not qualified.
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