Analysis Of Typhoon Hydrothermal Benefits To Shanghai Area

North western Pacific is the only ocean which has the most typhoon formation, the most frequent accurrance and a widest range of typhoon in the whole year. Therefore,the study of typhoon has far reaching significance today. Typhoon can relieve drought and make temperature drop substantially. Even we were suffering continuous high temperature in summer, the temperature would decrease immediately accompanied with typhoon. Then the demand for electricity and warter will be reduced since typhoon alleviates the high temperature.By using MODIS and weather station datas to calculate the vegetation index, we analyze the drought characteristics of Shanghai during Saomai period, so that we can show the changes from the two aspects of the vegetation growth and the surface temperature. On the other hand, through the relative humidity data of typhoon Saomai, we can find that the vegetation index and the relative humidity has been increased significantly. Besides, the average daily maximum temperature of meteorological stations in Shanghai is reduced about6.3℃.By the contrast between Saomai period and before, the result shows that the surface temperature is decreased from36℃to31℃on everage.Through characteristic analysis of heat waves in Shanghai, it is found that heat waves occurred194times for the past100years.70%probability typhoon activities occurred after the heat waves,and the longer heat waves continues, the higher the proportion of typhoon activity in the interruption. And the maximum temperature compared with the previous day reduced1.78℃when the heat waves have been interrupted by typhoon activities. Sometimes this cooling trend can keep for more than8days, and the cumulative cooling can be up to11.13℃. In January2003-July2006,about12heat waves are associated with typhoon activities. Because of the rduction of the daily maximum temperature, it reduces about56,015,000kwh (one typhoon up to253,750,000kwh), about34,281,180yuan for once averagely (one typhoonup to155million yuan). We find that some elements are closely related to energy consumption and the daily energy peak reduction during the typhoon period. Then we can forecast the daily energy peak, the energy and water consumption during typhoon period in the future, so that we can give recommendation for government decision-making.