Scheme Design and Effect Evaluation of a Typical Hail Suppression Operation over Western Henan

doi:10.3969/j.issn.1673-7148.2012.03.010

Abstract：Based on the typical case of hail suppression operation which occurred in Sihe township of Western Henan on July 17, 2011, a detailed analysis is conducted on correct discrimination of hail cloud, scientific development of scheme design as well as the tentative evaluation of the operating effect etc. A kind of operation scheme which uses Doppler radar products to determine the operational site, a- mount of catalyst and emission timing of hail suppression is designed, and a new thought is provided for the scientific development of artificial hail suppression operation and its effect evaluation in Western Henan. The results are as follows. 1） Hail cloud recognition is the key to the success of artificial hail suppression; short-term weather background, characteristics of meteorological element field, radiosonde data and radar indicator analysis can identify hail cloud in time. 2） The choice of operation apparatus, grasping operation timing, operation site judgment, catalyst quantity determination are all the effective factors which decide whether the artificial hail suppression operation succeeds or not. Before the operation a scientifically operation scheme must he carefully conducted, to reduce the artificial uncertainty. 3 ） When operation effect is evaluated, selected contrast cloud must have similar weather background, cloud features and generating source cloud with the target cloud. In addition, disaster situation is an important aspect of evaluation.