baby直播app

Thul, David听¹听;听Berlin, Maureen听²听;听Anderson, Robert S.听³

¹听Geological Sciences, Univ. of baby直播app at Boulder
²听Geological Sciences, Univ. of baby直播app at Boulder
³听INSTAAR and Geological Sciences, Univ. of baby直播app at Boulder

baby直播app's Roan Plateau provides a natural laboratory for the study of bedrock river incision due to its predominantly horizontal stratigraphy and numerous waterfalls up to 50 m in height. The morphology of these waterfalls can provide an important constraint on processes of waterfall retreat. Using a laser range finder we documented the morphology of East Fork Falls by surveying stratigraphic markers along the waterfall face, cliff tops, and points around the plunge pool. East Fork Falls has areas of undercutting where the face is recessed 2-20 m beyond the waterfall lip. The north and south faces have markedly different morphology; the north face is overhanging and blocky while the south face is smooth and nearly vertical. Also, the plan form of the waterfall alcove is roughly parabolic with a slight northeast skew. At the time of surveying, the waterfall jet did not access the plunge pool and instead impacted a mottled surface on the waterfall face 5 m upstream of the pool. We calculated that an upstream horizontal velocity of 2.6 m/s was required for the jet to access the plunge pool. As this high velocity is typically not met by the upstream flow conditions, plunge pool erosion may not be the dominant waterfall retreat process here