V-Shaped Valley Landscape
A V-shaped valley is a river landscape feature in the early stage of development. In this stage (equivalent to the upper course of a river or a region subject to strong neotectonic uplift), the downward erosion of the river is stronger than its lateral erosion, causing rapid vertical corrasion. As a result, the valley deepens rapidly to form a deep narrow V-shaped valley with steep slopes, accompanied by a riverbed with a steep gradient, rapid flow and the development of thresholds and waterfalls. A typical example in China is the Jinsha River valley along the upper Yangtze River (Changjiang), where the narrowest section in Hutiao (Leaping Tiger) Gorge is only 40–60 m wide, up to 3,000 m, and the slope gradient is up to 70°. V-shaped valleys have different characteristics in different stages of development, so they can be categorised as cliffy gorges, narrow gorges and canyons. V-shaped valleys are important tourism resources.