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2014 年秋に実施したブータン・ヒマラヤでの小型氷河と山岳永久凍土観測

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2014 年秋に実施したブータン・ヒマラヤでの小型氷河と山岳永久凍土観測

福井幸太郎1、藤田耕史2、プンツォ・ツェリン2

1富山県立山カルデラ砂防博物館

2名古屋大学環境学研究科

The research expedition of the glacier and permafrost in the Bhutan Himalayas in 2014.

Kotaro FUKUI1, Koji FUJITA2 and Phuntsho TSHERING2

1Tateyama Caldera Sabo Museum

2Graduate School of Environmental Studies, Nagoya University

This study presents preliminary results of the glacier and permafrost research in the Bhutan Himalayas in October of 2014.

We investigated the ice thickness and surface flow of the small glcier near Gophu La (5479 m ASL) and the Gangju La glecier (4920-5200 m ASL) in the Lunana region based on ground penetrating radar (GPR) soundings and differential GPS suvey.

We observed rock glaciers and periglacial phenomena along the Snowman Trekking Route in the central and the northern Bhutan. We estimated the lower limit of mountain permafrost and periglacial zone in this region.

2014 年 10 月にブータン・ヒマラヤで小型氷河と山岳永久凍土の観測を行った。ブータン北部ルナナ地方の

Gophu La(標高5479 m)東側の雪崩涵養型氷河とGangju La 氷河(標高4920~5200 m)で地中レーダーを使った

氷厚観測や測量用 GPS を使った短期流動観測を実施した。ブータン中央部のブムタン地方から北部のルナナ地方

にかけてSnowman trekking route 沿いに見られる岩石氷河や周氷河地形の分布を調査し山岳永久凍土や周氷河帯の

下限高度を推定した。推定された永久凍土と周氷河帯の下限高度をブータン北西部のそれ(Iwata et al., 2003)と比 較した。

References

Iwata, S., Naito, N., Narama, C. and Karma, Rock glaciers and the lower limit of mounain permafrost in the Bhutan Himalayas, Z. Geomorph. N.F. Suppl., 130, 129-143, 2003.

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