flooding boundary
1.Flooding frequency has an increasing trend in Aksu River basin since 1987. 500 hPa circulation pattern of mixed flood in flooding season of Aksu River basin is characteristics of Xinjiang High ridge steady over middle and east parts of Tianshan Mountains, and north boundary of 5 880 gpm height line steady in /over Tianshan and North Xinjiang regions and west boundary extend to south Xinjiang closed to Pamirs Plateau, and subtropical low trough in central Asia.
