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Large thermo-erosional tunnel for a river in northeast Greenland
https://nipr.repo.nii.ac.jp/records/14754
https://nipr.repo.nii.ac.jp/records/14754defa9c4d-bdde-4cd7-ab19-35bf12175479
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2017-12-11 | |||||
タイトル | ||||||
タイトル | Large thermo-erosional tunnel for a river in northeast Greenland | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Large thermo-erosional tunnel for a river in northeast Greenland | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Permafrost Stream | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Climate change | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Snowmelt runoff | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Arctic | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Docherty, Catherine L.
× Docherty, Catherine L.× Hannah, David M.× Riis, Tenna× Rosenhøj Leth, Simon× Milner, Alexander M. |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Thermo-erosional river bank undercutting is caused by the combined action of thermal and mechanical erosion of the permafrost by Arctic rivers whilst the overlying sediment withstands collapse temporarily. Here, we report the discovery of a large thermo-erosional tunnel that formed in the banks of a meltwater-fed stream in northeast Greenland in summer 2015. The tunnel was observed over eight days (14–22 July), during which period the tunnel remained open but bank-side slumping increased. Stream solute load increased immediately downstream and remained high 800 m from the tunnel. Whilst this field observation was opportunistic and information somewhat limited, our study provides a rare insight into an extreme event impacting permafrost, local geomorphology and stream habitat. With accelerated climate change in Arctic regions, increased permafrost degradation and warmer stream water temperature are predicted thereby enhancing potential for thermo-erosional niche development and associated stream bank slumping. This change could have significant implications for stream physicochemical habitat and, in turn, stream benthic communities, through changes in aquatic habitat conditions. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 熱侵食により川岸の下部が抉られる現象は、北極域の河川によって永久凍土が熱的および機械的な複合的侵食作用を受けた際、上部の堆積物が一時的に崩壊せずに持ちこたえることで生じる。ここでは、2015年夏にグリーンランド北東部において融雪水流の川岸に形成された大きな熱侵食トンネルの発見について報告する。このトンネルは8日間(7月14日〜22日)開いたまま観測され、その間川岸の崩落が増大し続けた。河川水の溶質負荷はすぐ下流で増加し、トンネルから800mまでの範囲で高いままであった。この現地観測は偶然の機会によるもので情報は多少限定されるが、本研究は永久凍土、地形および水流流域の生息環境に影響を与える極端現象の一つについての稀な洞察を与えるものである。北極域の気候変動が加速することにより、永久凍土の劣化と河川における水温上昇が予測され、河岸の融解浸食進行とそれに伴う川岸崩壊の可能性が高まる。この変化は、このような小河川の物理化学環境を変え、水生生物環境に深刻な影響を及ぼす可能性がある。 | |||||
書誌情報 |
en : Polar Science 巻 14, p. 83-87, 発行日 2017-12 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.polar.2017.08.001 | |||||
関連名称 | 10.1016/j.polar.2017.08.001 |