排序方式： 共有2条查询结果，搜索用时 0 毫秒
1
1.
Bohumír Janský Zbyněk Engel Miroslav Šobr Vojtěch Beneš Karel Špaček Serguei Yerokhin 《Natural Hazards》2009,50(1):83-96
An interdisciplinary study of glacier-related hazards in the Petrov lake region (Ak-Shiirak Range, the Inner Tien-Shan, Kyrgyzstan)
has been undertaken to identify potential dangers to the area. A cooperative effort from experts in the fields of hydrology,
glaciology, geomorphology and geophysics has been employed in this study. For the hazard assessment, evolution of the Petrov
glacier and lake was reconstructed using historical reports, aerial photographs and satellite images. Geomorphological mapping
and geophysical soundings was applied to the lake territory and the moraine dam. This has identified potentially hazardous
areas of the dam including subsurface drainage zones and cracks that could cause a sudden extremely high discharge. In the
past three decades, the Petrov lake has doubled in size, while in recent years, its area has been increasing by more than
92,000 square metres per year. Although there is no evidence for an imminent outburst, the dramatic increase in the lake’s
size emphasizes the importance of this study. 相似文献
2.
Existing methods of evaluating the hazard posed by moraine-dammed lakes are unsystematic, subjective, and depend on the expertise
and biases of the geoscientist. In this paper, we provide a framework for making objective preliminary assessments of outburst
flood hazard in southwestern British Columbia. Our procedure relies on remote sensing methods and requires only limited knowledge
of glacial processes so that evaluations of outburst flood hazard can be incorporated into routine hazard assessments of glaciated
regions. We describe objective approaches, which incorporate existing empirical relations applicable to the study region,
for estimating outburst peak discharge, maximum volume, maximum travel distance, maximum area of inundation, and probability.
Outburst flood hazard is greatest for moderately large lakes that are impounded by large, narrow, ice-free moraine dams composed
of sedimentary rock debris and drain into steep, sediment-filled gullies above major river valleys. We demonstrate the application
of the procedure using three case studies and show that flood hazard varies, especially with major changes in lake level.
Our assessment scheme yields reproducible results and enables engineers and geoscientists to prioritize potentially hazardous
lakes for more detailed field investigation. 相似文献
1