The wavy distribution curve of precipitation formed on the longitudinal-arranged underlying rangegorge landforms.At leeside of range, dry valley formed due to fohn effect.
It is found that dry intrusion maintained during the precipitation periods.The intensity of precipitation increased with the increasing dry intrusion, which pushed the rainy region southeastwards.
Minish the well space and increase transflux routeways upper backwater and driving, especially setup precipitation well and drain residual water at the bottom of diving layer.