A turbulence characteristic calculation method for near-stratum strong wind
A feature calculation, near-surface layer technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of lack of vertical velocity w and time resolution, and low temporal resolution in two-dimensional wind field data, so as to improve the quality monitoring level and data. Stability, effect of increasing the number of computable variables
Active Publication Date: 2019-06-18
JIANGSU METEOROLOGICAL OBSERVATORY +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a calculation method for the turbulence characteristics of the near-surface gale, solve the calculation problem of the turbulence characteristic value of the 1Hz two-dimensional wind field, and obtain the 1Hz data turbulence by comparing and analyzing the turbulence characteristics of the 10Hz three-dimensional wind field data Specifically calculated specific parameters, overcome the problems of lack of vertical velocity w and low time resolution in two-dimensional wind field data, and further improve the utilization rate of near-surface observation data
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[0066] like figure 1 As shown, the calculation method of the turbulent characteristics of the near-surface gale includes the following steps:
[0067] (1) Preparatory work before the calculation of turbulence characteristics such as quality control, wind direction adjustment, and fluctuating wind calculation based on the original observation data of 10Hz three-dimensional ultrasonic wind speed;
[0068] Specifically include the following sub-steps:
[0069] (1) Perform quality control on the original data, and filter out wild points that appear in the original data due to unstable power supply pulses, unstable sensing elements, or other reasons based on the following formula:
[0070] |dx(i)|=3σ
[0071] Where x represents the time series of u, v and w, dx(i)=x(i+1)-x(i), and σ is the standard deviation of sequence x;
[0072] Then remove the wild points detected in the previous step, and interpolate with the following method:
[0073] x(i)=x(i-1)R m +(1-R m )X m
[00...
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The invention discloses a turbulence characteristic calculation method for near-stratum strong wind, and relates to the technical field of weather and wind engineering. According to the turbulence characteristic calculation method for the near-stratum strong wind, a conversion coefficient inverted by observation data of an ultrasonic three-dimensional wind field is adopted to calculate Turbulencecharacteristics such as the friction speed, the underlying surface roughness, the momentum exchange coefficient and the heat induction exchange coefficient for surrounding two-dimensional wind field observation data, the number of calculable variables of the two-dimensional data is increased, and the data application scene is expanded. According to the method, the utilization rate of 1Hz two-dimensional near-surface wind field observation data is effectively utilized, the turbulence characteristics such as the friction speed, the underlying surface roughness, the momentum exchange coefficientand the heat induction exchange system which cannot be calculated in the prior art are increased, and the method has practical significance for turbulence characteristic analysis under the strong windcondition. And the near-surface turbulence observation data source in China is expanded, and the quality monitoring level and the data stability of the 10Hz three-dimensional ultrasonic data are further improved by comparing the data source with 1Hz data.
Description
technical field [0001] The invention relates to the technical field of meteorology and wind engineering, in particular to a method for calculating turbulence characteristics of strong winds near the surface. Background technique [0002] The impact of strong winds on buildings and trees accompanying weather processes such as landing typhoons, squall lines, thunderstorms, and cold waves is an important factor for disasters caused by high winds, while turbulence and gust characteristics at high wind speeds are key factors affecting wind loads. In recent years, there have been many analyzes of turbulence characteristics of landfalling tropical cyclones, and on this basis, the relationship between gust coefficient G and turbulence intensity I has been obtained. The above studies concluded that under strong weather conditions affected by typhoons, there is a positive correlation between turbulence intensity and gust coefficient; and pointed out that the underlying surface has a s...
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IPC IPC(8): G06F17/50
CPCY02A90/10
Inventor 蔡凝昊明杰孙泓川刘安宁宗培书俞剑蔚王元李力苏翔
Owner JIANGSU METEOROLOGICAL OBSERVATORY
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