Recession rate of Poudre Falls in Rocky Mountain Front Range, Colorado, USA
The recession rate of Poudre Falls in the Colorado Front Range is examined using an equation by Hayakawa and Matsukura (Eath Surf. Processes Landf., 28. 2003). In spite of stable tectonics and a cold semi-arid climate in the region, the estimated
recession rate for 12 000 y. indicates rapid erosion of the waterfall. This indicates that the waterfall recession is a primary response of fluvial erosion after deglaciation, creating a narrow gorge below the waterfall. Further data collection
will be necessary to assess the waterfall recession rates in such glaciated regions.
Recession rates of Kaminari Falls in the upper Matsukawa River, Takayama Village, Nagano Prefecture
Based on the Hayakawa and Matsukura equation (2003) using parameters specifying the erosive force and the bedrock resistance, the AA. examine here the recession rate of the Kaminari Falls in Takayama Village, Nagano Prefecture.
This study examines the rate of recession of Shomyo Falls, which consists of Pleistocene welded pyroclastic flows deposits in Toyama Prefecture. The discrepancy between the geology-based and equation-based recession rates indicates that some factors
, not taken account of in the equation, significantly influence the recession rate. The AA. suggest that a factor in the rapid erosion of the waterfall is a large amount of transported sediment acting as abrasive material, which is supplied from high mountains
This study examines recession rates of waterfalls in welded Aso-1 ignimbrite from the Aso volcano in southwestern Japan using an empirical equation, which comprises a force/resistance index composed of measurable geomorphic parameters. The estimated
rates are then validated by examining the duration and distance of their recession. The contrast between the highly dissected landforms downstream of the present waterfalls and the gentle landscapes upstream of the waterfalls suggeststhat the rapid
recession of the waterfalls is the major cause of post-eruptive fluvial erosion into ignimbrites.