Firstly,the paths and spatial distribution of hail in Zunhua City were analyzed,and then based on years of working experience in artificial operations,the mechanism of artificial hail-suppression operations in Zunhua ...Firstly,the paths and spatial distribution of hail in Zunhua City were analyzed,and then based on years of working experience in artificial operations,the mechanism of artificial hail-suppression operations in Zunhua was analyzed from the aspects of the occurrence law of hail,methods of artificial hail-suppression operations,and the layout of artificial operation sites in Zunhua City. Finally,the benefit of hail-suppression operations was analyzed based on the data of hail damage in the past five years. The results show that the layout of the built operation sites in Zunhua City is reasonable,and they effectively reduce the occurrence of hail damage and improve the disaster prevention and mitigation capacity of Zunhua City.展开更多
Based on the meteorological data from 1951 to 2015 in Beijing,the reference crop evapotranspiration(ET_0)in Beijing was estimated using the FAO 56 Penman-Monteith method,the FAO PPP-17 Penman method,the Hargreaves met...Based on the meteorological data from 1951 to 2015 in Beijing,the reference crop evapotranspiration(ET_0)in Beijing was estimated using the FAO 56 Penman-Monteith method,the FAO PPP-17 Penman method,the Hargreaves method,and the Priestley-Taylor method.The results showed that the monthly and annual changing trends of ET0 estimated by the four methods are basically the same.In general,the ET0 values estimated by the Hargreaves method are the closest to those of the standard method FAO 56 Penman-Monteith,while the difference between the FAO PPP-17 Penman method and the standard method is the biggest.The Hargreaves method is the most suitable method for the estimation of ET0 in Beijing.展开更多
文摘Firstly,the paths and spatial distribution of hail in Zunhua City were analyzed,and then based on years of working experience in artificial operations,the mechanism of artificial hail-suppression operations in Zunhua was analyzed from the aspects of the occurrence law of hail,methods of artificial hail-suppression operations,and the layout of artificial operation sites in Zunhua City. Finally,the benefit of hail-suppression operations was analyzed based on the data of hail damage in the past five years. The results show that the layout of the built operation sites in Zunhua City is reasonable,and they effectively reduce the occurrence of hail damage and improve the disaster prevention and mitigation capacity of Zunhua City.
基金Supported by National Natural Science Foundation of China(41371065)
文摘Based on the meteorological data from 1951 to 2015 in Beijing,the reference crop evapotranspiration(ET_0)in Beijing was estimated using the FAO 56 Penman-Monteith method,the FAO PPP-17 Penman method,the Hargreaves method,and the Priestley-Taylor method.The results showed that the monthly and annual changing trends of ET0 estimated by the four methods are basically the same.In general,the ET0 values estimated by the Hargreaves method are the closest to those of the standard method FAO 56 Penman-Monteith,while the difference between the FAO PPP-17 Penman method and the standard method is the biggest.The Hargreaves method is the most suitable method for the estimation of ET0 in Beijing.
