The temporal and spatial variation characteristics analysis of precipitation in Honghe River basin

Collected 52 observation stations precipitation data of recent 43 years in Honghe River basin come from Yunnan Meteorological Administration,by using of the interpolation method of Inversed Distance Weighted in ArcMap,the series maps of different temporal precipitation's surface of Honghe River basin were created.Based on these maps,the spatial distribution of annual,wet season and dry season precipitation can be further analyzed.The long-term change trend index of annual and seasonal precipitation was applied to examine the trend of precipitation changing in Honghe River basin in recent 43 years.The primary result included as that:① There is a weak ascending trend for annual precipitation in study's basin in temparal and spatial aspect,only except the part in the middle and lower reaches of mainstream and the north and northeast of Panlong river basin.② The changing trend between wet and dry season are different.In wet season the decline area expand to the whole middle part of the study basin.But during dry season,there is an increasing trend in almost the basin. ③ Since the precipitation trends characteristics change in spatial distributions in different season with more rainfall in dry season while less rainfall in wet season,it becomes more balance and stable,so it reduce the probability of drought and flood'occure.