2006年
ネパール東部ヒンク・ホング地域およびブータンヒマラヤの氷河湖の現状と拡大特性
地学雑誌
- 巻
- 115
- 号
- 4
- 開始ページ
- 531
- 終了ページ
- 535
- 記述言語
- 日本語
- 掲載種別
- 研究論文(その他学術会議資料等)
- DOI
- 10.5026/jgeography.115.4_531
- 出版者・発行元
- Tokyo Geographical Society
Records of recent changes in growing ice-contact lakes in the Bhutan-China border region are investigated using satellite imagery. The results show that lake growth has continued at a growth rate of< 70 m/year in length and < 0.04 km2/year in area. In the debris-covered area of the glacier, the lake expands in stages through the initial appearance of supraglacial lakes and subsequent expansion of a coalesced lake. In the small debris-free or partially debris-covered glacier, the lake expands simply from a single lake. The initial year of appearance of most of the lakes at the southern and northern sides of the Himalayan mountains ranges from the 1950s to the 1970s and before the 1950s, respectively. Furthermore, the trace of the glacial lake outburst flood (GLOF) in the Hinku valley, and the present situation of the glaciers and the glacial lakes in the Hongu valley in eastern Nepal are confirmed by the field survey. Many boulders and coarse sands generated from the GLOF in 1998 remain distinctly and continuously at least 10 km downstream from the collapsed lake as a bare river bed with thick debris flow deposit. The assessment considered that there are no serious conditions regarding the GLOF given the present situation of both valleys. Comparison with previous data shows that the retreat speed of glaciers at the headwater of the Hongu valley is approximately 8 m/year.
- リンク情報
- ID情報
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- DOI : 10.5026/jgeography.115.4_531
- ISSN : 0022-135X
- CiNii Articles ID : 10020538966
- CiNii Books ID : AN00322536