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Keelung Nuannuan pothole
Keelung Nuannuan pothole is a pothole or kettle hole in the exposed bed of the Keelung River at the town of Nuannuan (暖暖), near Keelung City in Taiwan. A pothole is a circular depression on the river bed carved out of solid rock. It is formed by a kind of drilling action as pebbles are caught in eddy currents and whisked around within a small natural crack or hollow. As time passes, the drilling action enlarges the hollow to form a pothole. Potholes are commonly found below waterfalls or rapids where hydraulic action is a significant process.
==Geological interest==
These naturally occurring potholes are of great interest to geologists, as they're quite uncommon. The best-known kettle holes in Taiwan are a mass of indents in the exposed bed of the Keelung River at the town of Nuannuan (暖暖), near Keelung City, although part of their fame is surely due to their lying right beside a busy road. Keelung River near Nuannuan has a narrower river channel and thus faster flowing water and turbulents which results in the formation of potholes.〔(【引用サイトリンク】url=http://www.chinapost.com.tw/travel/taiwan-north/taipei/2009/08/03/218904/The-amazing.htm )〕 Riverbed potholes normally take many hundreds years to form and it is an extremely important geological feature. The formation phenomena provokes wide research interests in fluid dynamics, landscape, geology, climate, hydrological and rock studies. Its rarity also serve as an invaluable educational resource for everybody.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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