Development of the karsts in the Tongkou hydropower station,Beichuan,Sichuan

Abundant karsts are developed in the construction site of the Tongkou hydropower station,Beichuan,morphologically including corroded gully,solution groove,corroded funnel,sinkhole,karst cave and corroded depression which are controlled by lithological,geological,structural and geomorphological features.These karsts display zonal distribution along the river valleys and faults.In Yudongzi gully,deep-seated karsts are also observed.