PRELIMINARY DISCUSSION OF THE FREQUENTLY DEBRIS FLOW EVENTS IN SEDONGPU BASIN AT GYALAPERI PEAK, YARLUNG ZANGBO RIVER
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摘要: 以Landsat等中高分辨率多源遥感影像为基础,对色东普流域近40 a来冰川的分布和变化情况进行研究,梳理分析了2014年以来色东普流域内发生的8次碎屑流堵塞雅鲁藏布江事件,并结合雷达数据以及气象资料探讨该流域内频繁发生碎屑流事件的原因。分析结果表明:色东普流域内"陡-缓-较陡"的阶梯状地形为碎屑流频繁发生提供了地形基础,沟口河道的半堵塞状态、冰川后缘的大量裂隙、林芝地震和充沛的降雨量等多种因素共同作用导致色东普流域内碎屑流事件频发。依据研究结果预计未来较长时间内色东普流域仍会发生多次冰崩碎屑流事件,建议在雅鲁藏布江大峡谷区域内建立长期灾害监测预警体系,为色东普沟冰崩碎屑流灾害的应急工作提供有效支撑。Abstract: We used Landsat and other high-moderate space resolution images to analysis the glacial retreat in the recent 40 years of Sedongpu Basin, and combed the eight times debris flow blocking Yarlung Zangbo river incidents of Sedongpu Basin after 2014. Combined with the radar and meteorological data, we analyzed the reasons of frequent collapse disasters occurred in the basin. Then we found the following factors. First, the "steep-gentle-relative steep" ladder terrain is the foundation of the frequent occurrence of the debris flows in Sedongpu Basin. Second, the debris flow always block the channel at a large extent. Third, there are lots of crevasses in the glacier trailing edge. Fourth, earthquake and abundant rainfalls also lead to the frequent debris flow of Sedongpu Basin. Combined the above factors, we speculate the glacier avalanche induced debris flow(GAIDF) of Sedongpu Basin will happen frequently for a long time with typical periodicity. So, we suggested to establish a long-time monitoring and warning system for the Yarlung Zangbo Grand Canyon in order to provide effective support to the emergency work of Sedongpu Basin glacier debrisflow.
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Key words:
- Sedongpu Basin /
- Glacier avalanche /
- Block the river /
- Debris flow
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表 1 不同年份色东普沟各条冰川面积汇总
Table 1. The summary of glaciers ion in Sedongpu basin
冰川编号 1977面积/km2 1987面积/km2 1999面积/km2 2011面积/km2 2018面积/km2 SDP-1号 10.86 7.86 6.26 6.07 6.03 SDP-2号 10.52 8.30 4.69 4.64 4.69 SDP-3号 2.05 2.01 1.77 1.71 1.64 SDP-4号 1.55 1.55 1.55 SDP-5号 1.33 1.33 1.13 1.13 1.13 SDP-6号 0.73 0.73 0.73 SDP-7号 9.71 2.88 0.73 0.73 0.73 SDP-8号 0.58 0.58 0.72 SDP-9号 0.42 0.42 0.42 SDP-10号 0.41 0.41 0.41 SDP-11号 0.38 0.38 0.38 SDP-12号 0.60 0.54 0.37 -
Li H M, Li L. 2015. Mean and extreme climate change on the Qinghai-Tibetan plateau with a 2℃ global warming[J]. Progressus Inquisitiones de Mutatione Climatis, 11(3):157-164. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=qhbhyjjz201503001 Su J Z, Wen M, Ding Y H, et al. 2016. Hiatus of global warming:A review[J]. Chinese Journal of Atmospheric Sciences, 40(6):1143-1153. http://www.en.cnki.com.cn/Article_en/CJFDTotal-DQXK201606004.htm Zhang R J. 2010. The relationship between the evolution of glaciers and the geological hazards in Qinghai-Tibet plateau[J]. Remote Sensing for Land & Resources, (S):54-58. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gtzyyg2010z1014 Zheng R, Li D L, Jiang Y C. 2015. New characteristics of temperature change over Qinghai-Xizang plateau on the background of global warming[J]. Plateau Meteorology, 34 (6):1531-1539. http://d.old.wanfangdata.com.cn/Periodical/gyqx201506003 李红梅, 李林. 2015. 2℃全球变暖背景下青藏高原平均气候和极端气候事件变化[J].气候变化研究进展, 11(3):157-164. doi: 10.3969/j.issn.1673-1719.2015.03.001 苏京志, 温敏, 丁一汇, 等. 2016.全球变暖趋缓研究进展[J].大气科学, 40(6):1143-1153. http://d.old.wanfangdata.com.cn/Periodical/daqikx201606004 张瑞江. 2010.青藏高原冰川演变与地质灾害[J].国土资源遥感, (S):54-58. http://d.old.wanfangdata.com.cn/Periodical/gtzyyg2010z1014 郑然, 李栋梁, 蒋元春. 2015.全球变暖背景下青藏高原气温变化的新特征[J].高原气象, 34(6):1531-1539. http://d.old.wanfangdata.com.cn/Periodical/gyqx201506003 -