Development of computing method of design rainfall based on modeling instability field with homogeneous statistic structure

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It was our intention that instability field model which we have been developing should be developed as a field which has homogeneous statistical structure. According to this intention the instability field model has been extended to be applied typhoon. Moreover, the model has extended to have a function that the water vapor can be transported from lower layer to upper layer of atmosphere.On the other hand, in order to make it possible to identity the modeled instability field, a method of estimating three-dimensional wind velocity and conversion rate of water vapor by using the information on radar reflectivity has been proposed. By the investigation on the accuracy using wind field observed by a doppler radar and MV radar, the method showed good skill. This method, moreover, has been extended to be applied on the rainfall over the wide area.On a basis of the methods and investigations above, some statistical analyses were done, through use of rainfall not effected by topography. These analyses showed an ample proof that those methods above has high possibility to become a physical based method of computing design rainfall.