In recent years, agriculture and animal husbandry production in the western Sichuan plateau was greatly affected by drought, therefore, it was necessary to study the applicability of remote sensing drought comprehensive index in the grassland area of the western Sichuan plateau. In this study, the vegetation condition index (VCI), the temperature condition index (TCI) and precipitation condition index (PCI) were selected to construct the scaled drought condition index (SDCI), which was suitable for the combination of the regional weight of grassland in the western Sichuan plateau, the index monitoring results were verified by standardized precipitation evapotranspiration index (SPEI) during the same period, the characteristics of summer drought from June to August during 2000-2018 were analyzed after the suitable drought grades in the study area were divided. The results show that: (1) The drought judgment index SDCI highlighted the cumulative effect of precipitation and had high monitoring accuracy. It was basically consistent with the monitoring results of SPEI on the drought events in 2006. Only in some places, the scope and intensity of the drought were slightly different from the actual situation. (2) The location of the month-scale drought was mostly distributed in the west and south of Ganzi Prefecture and the south of Aba Prefecture, and in the northeast of Zoige there was mostly no drought in summer during 2000-2018. The degree of drought was stronger in June and August, it was mainly mild to moderate drought, and in July there was mostly mild drought and no drought. (3) The frequency of drought was high and the range was wide in June and August during 2000-2018. In July, the frequency of mild drought was 60.66% in the whole region, and the frequency of drought above mild level was higher (more than 40%) in the southwest, northwest, north and east of Ganzi Prefecture, while the drought frequency in northern Aba Prefecture was lower (less than 40%). The research showed that the SDCI with prominent precipitation effect had the ability to respond to extreme drought events, it could objectively and effectively monitor the drought status of grassland in the western Sichuan plateau.

 Based on the information of wind disaster accidents in Jiangsu section of the Yangtze River waterway and observations of automatic meteorological stations along the Yangtze River during 2015-2017, this paper analyzed the relationship between wind disaster accidents and strong breeze, strong crosswind. And combined the geographical environment and atmospheric background, a reasonable gale evaluation index was established. The results are as follows: (1) Wind disaster accidents occurred most in spring, which was related to high frequency of strong breeze and strong crosswind in this period. (2) The high occurrence period of wind disaster accidents and strong breeze was during 14:00-15:00 in a day, which was related to increase of convective wind in the afternoon. (3) The frequency of strong breeze and strong crosswind was directly affected by the difference of geographical environment in Jiangsu section of the Yangtze River waterway and indirectly affected the amount of wind disaster accidents. (4) A wind pressure early warning system had been established, when wind pressure was above 40 N·m-2, the risk was higher. (5) The enhancement of instantaneous wind had a great influence on navigation of ships. The WFI was more reasonable to evaluate the risk of strong wind. (6) By calculating the variability of air flow through water surface, the maximum wind force that may be suffered by ships on the river surface in winter and summer was estimated again, it verified that the current wind warning index was reasonable.