午夜欧美大片免费观看,欧美激情综合五月色丁香,亚洲日本在线视频观看,午夜精品福利在线

Taking hail disasters in the main tobacco growing areas of Sichuan Province as an example, the important role of the regional natural disaster system theory in combination with the tobacco climatic adaptation characteristics has been studied using the data of hail disaster frequency, DEM (Digital Elevation Model), and ground surface,as well as agricultural socioeconomic data, and the hazard of disastercausing factors, the sensitivity of hazardformation environments, the vulnerability of hazard bearing body, and the capacity of resisting disasters are chosen to construct the meticulous hail disaster risk assessment mathematic model with the help of GIS technology. Based on the tobacco climate adaptability, the hail disaster risk index of the Panxi region is devised. Connected with the practical situation locally, the Panxi region is divided into six parts by using the risk index. The results indicate that the region with high risk is mainly in the source area of the Anning River valley and the Yalong River downstream. Meanwhile, the low mountainous region and hilly areas of the south valley also belong to the highrisk areas. These results provide a scientific basis for hail disaster prevention.