Climate variation analysis of the impacts of high temperature on the middle Yangtze River shipping

According to the features of the high temperature´s impacts on inland shipping, the impacts were divided into light, moderate and severe level. Based on the series data of temperature time in seventeen stations which near the coastal area of Middle Yangtze River during the period between 1965 and 2008, the characteristics of climate variations influenced by the high temperature are analyzed and discussed by the linear trend estimation and wavelet method. The results was that the influences in light and moderate levels were increased, while it was reduced slightly in moderate level (the absolute value were less than 2.5d/10a), which indicated that the ones in the former two levels are more frequent and fluctuating. Besides, there were distinct periodic oscillations around 5-15a and 15-30a periods for multi-time structures in temperature variations. In addition, severe heat wave and the high temperature existed in all seventeen stations, which could have important effects on the goods transportation and the crew on the ship. Therefore the protective measures should be taken to ensure the navigation safety.