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水文类：壶穴
五级电站壶穴
Name：Pothole
杨湾电站（五级电站）桥下见一壶穴，园形，直经约6m，深1-3m中肚略大，壶壁磨蚀圆滑，为由旋流裹挟砂砾冲蚀、磨蚀河底黑云母花岗岩而成。形成于第四纪，距今2.6Ma以来。
A round pothole with the diameter of nearly6 munder thebridgeofYangwanpower station (the fifth level power station) is 1-3 min depth which is big in middle part. The wall of pothole is abraded smoothly which is formed in quaternary (2.6 Ma B.P.) by biotite granite in the bottom of river corroded and abraded by a rotational flow with sand gravel.