Classification and formation environment of glacial valleys based on morphometric analyses

TitleClassification and formation environment of glacial valleys based on morphometric analyses
Publication TypeConference Paper
Year of Publication2013
AuthorsNaruse, Kosuke, and Takashi Oguchi
Refereed DesignationRefereed
Conference NameGeomorphometry 2013
Date Published2013
Conference LocationNanjing, China
AbstractThis paper analyzes glacial valleys in the Swiss Alps, the Himalayan Range, Yosemite, the New Zealand Southern Alps, and Patagonia using DEMs. Transverse and longitudinal profiles of four to six valleys in each region were obtained and the aspect/form ratio (FR) and slope of each small segment of a transverse profile were calculated. Forms of glacial valleys were evaluated using FR and the kurtosis, skewness, and standard deviation of slope. FR tends to converge into 0.28 with increasing valley size, which may correspond to the balance of vertical and lateral glacial erosion as well as a threshold slope angle for slope failure after deglaciation. The transverse profiles were classified into four types based on their geomorphometric properties: 1) U-shaped, 2) V-shaped, 3) plain, and 4) others. The most common type, other than “others” that include various forms, is U-shaped in New Zealand and Patagonia, V-shaped in the Himalayas, and plain in Yosemite and the Swiss Alps. These differences may reflect regional characteristics of snowfall, mass wasting, tectonics, and the history of glacier advances. FR may also indicate the past location of the glacial equilibrium line.
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