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'Bottleneck' effect – one of possible mechanisms of rock avalanche mobilityтезисы доклада
- Автор: Strom A.
- Сборник: Geologically Active/ Rxtended abstracts of the Proc. of the 11th Congress of IAEG
- Тезисы
- Год издания: 2010
- Первая страница: 95
- Последняя страница: 95
- Аннотация: Rock avalanches that affect sites at a large distance from the collapsing slope represent major hazard in rockslide-prone mountainous areas. Several morphological types of such features can be identified. Those classified as 'secondary' rock avalanches are characterized by 'dual' along- way debris distribution with large portion of debris accumulated at its proximal part, while other portion forms long-runout avalanche. Some of secondary rock avalanches originated when rapidly moving debris entered sharp valley narrowing. Portions of debris that had passed through such 'bottleneck' form rock avalanches with abnormally long travel distance. It is hypothesized that such rock avalanches originate due to momentum transfer from rapidly decelerating portion of debris that accumulates at the proximal part of the deposition zone to its portion retaining possibility of further motion. It provides the latter's acceleration resulting in extra-mobility. The Chaartash-2 and the Shake-Head case studies in the Tien Shan featuring expressive 'bottleneck' effect are described. Same mechanism – the momentum transfer – could govern shape of rockslide dams, steepness of up- and downstream slopes, in particular. Possibility of such phenomena should be considered for rockslide/rock avalanche hazard assessment.
- Добавил в систему: Стром Александр Леонидович