The Analysis Of Typhoon Speed Field Characteristic By Single Doppler Radar

Typhoon is the disaster weather which influences The southeast coast of the our country.But themain life of Typhoon expect to be on the ocean, so lack an integrity to prognosticate adata.Moreover,also because of as to it's born, development, minute part structure, and all lack theunderstanding with whole to a lot of factors which influence its ambulation and strength change,so wecan't obtain the Typhoon more overall data directly.In recent years, along with the extensive application of new generation Dopplor weatherradar,target object along radar path to of the speed can be measured,thus the ability of weather radar tovarious weather system,especially the disaster weather identify with early-warning abilityStrengthened.Thus an ability of the weather radar probe into the various weather system, especiallywith the disaster weather identify and early-warning ability to be strengthened consumedly.In thedistance the small district of certain scope that the radar can measure,Pass to this radar path inside thedistrict toward the analysis of the speed characteristic, the characteristic of convergence anddivergence and air revolve etc.,can be made sure Inside this district.These characteristics can provideimportant clues to judge for the strength of convection storm and Concrete strong convectionweather,for example the typhoon.Basic to Rankine Mode principle, by writing computer procedure and analyse,we can simulateDopplor speed field characteristic of immobile typhoon and moving typhoon under various wind fieldcondition,and by carried on analysis to these chaacteristics,then conclusion of general characteristics ofthe typhoon Dopplor speed field come out. When take no account of the influence of radial wind andenvironmental wind,zero speed lines are a straight line which passes typhoon center and radarcenters,Dopplor speed field is a symmetry structure.Nearby the two sides of zero speed line close totyphoon center, two symmetry and biggest Dopplor speed district exist. Typhoon center is hands over apoint by extremum point and Radar center with two extremum point straight lines with mutuallyperpendicular on-lines. When consider influence of radial wind and environment wind, typhoon centerwill deviate zero speed lines with Different degree. Zero speed lines will take place fiection, andproducing the dissymmetry structure of speed field. Contrarily, basis these characteristic,We can alsomostly estimate distributing of wind field of an environment.On this foundation, Analyzed to the information of the Dopplor speed field of two Typhoon whichinfluence our country in recent years,then carry on a contrast with typhoon wind field model of imitating.further more,we can measure and forecast the structure, variational strength and direction of typhoonqualitatively even quantificationally, Provide to forecaster with a higher use value and simple analyticalmeans, this will have important instruction meaning to the level which raises stage manners monitorand forecast.