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Avalanche activity and characteristics of its triggering factors in the western Tianshan Mountains,China

Journal of Mountain Science 2018年第7期15卷 1397-1411页

作者： HAO Jian-sheng HUANG Fa-rong LIU Yang amobichukwu chukwudi amanambu LI Lan-hai State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences No. 818 South Beijing Road Urumqi 830011 China. University of Chinese Academy of sciences Bering 100049 China Yili Station for Watershed Ecosystem Research Chinese Academy of Sciences No. 818 South Beijing Road Urumqi 830011 China. Xinjiang Regional Center of Resources and Environmental Science Instrument Chinese Academy of Sciences Urumqi 830011 China CAS Research Center for Ecology and Environment in Central Asia No. 818 South Beijing Road Urumqi Xinjiang 830011 China

Snow avalanche is a serious threat to the safety of roads in alpine mountains. In the western Tianshan Mountains, large scale avalanches occur every year and affect road safety. There is an urgent need to identify the characteristics of triggering factors for avalanche activity in this region to improve road safety and the management of natural hazards. Based on the observation of avalanche activity along the national road G218 in the western Tianshan Mountains, avalanche event data in combination with meteorological, snowpack and earthquake data were collected and analyzed. The snow climate of the mountain range was examined using a recently developed snow climate classification scheme, and triggering conditions of snow avalanche in different snow climate regions were compared. The results show that snowfall is the most common triggering factor for a natural avalanche and there is high probability of avalanche release with snowfall exceeding 20.4 mm during a snowfall period. Consecutive rise in temperature within three days and daily mean temperature reaching 0.5℃ in the following day imply a high probability of temperaturerise-triggered avalanche release. Earthquakes have a significant impact on the formation of large size avalanches in the area. For the period 2011-2017, five cases were identified as a consequence of earthquake with magnitudes of 3.3≤M_L≤5.1 and source-to-site distances of 19~139 km. The Tianshan Mountains are characterized by a continental snow climate with lower snow density, lower snow shear strength and high proportion depth hoar, which explains that both the snowfall and temperature for triggering avalanche release in the continental snow climate of the Tianshan Mountains are lower than that in maritime snow climate and transitional snow climate regions. The findings help forecast avalanche release for mitigating avalanche disaster and assessing the risk of avalanche disaster.

关键词： Snow avalanche Snow properties Snow climate Triggering conditions Risk management

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