Causes and Processes of Thermo‐Erosional Gully Initiation Near Tiksi Settlement, Arctic Eastern Siberia

IF 3 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Permafrost and Periglacial Processes Pub Date : 2024-05-22 DOI:10.1002/ppp.2229

A. Tarbeeva, Ya. V. Tikhonravova, Lyudmila Lebedeva, Anna Kut, Vladimir Shamov

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Abstract

Climatic and environmental change is leading to increased frequency and intensity of permafrost degradation processes; however, our knowledge of their mechanisms and rate is still limited. We examined structure of deposits, surface topography, and weather conditions during the initiation of a thermo‐erosion gully in eastern Siberia and monitored its changes between 2020 and 2022. The initiation of the gully was caused by a combination of processes: (1) the catchment area of the gully was artificially increased several decades ago as a result of the interception of runoff by the winter road; (2) ice‐wedge degradation led to surface runoff concentration above the gully head, while a large volume of ground ice remained in other parts of the slope, and frost cracking continued; (3) the entry of water into frost cracks formed underground tunnels; and (4) high air temperatures and heavy rainfall immediately before the gully appearance resulted in the expansion of the tunnels and collapse of their roof. In 2 years, the volume of the gully reached 1000 m3; at least 40% of that volume consists of ground ice. The gully development did not significantly change the water chemistry due to significant water freshening caused by melting of ground ice.

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东西伯利亚北极地区提克希定居点附近热侵蚀沟壑形成的原因和过程

气候和环境变化正在导致永久冻土退化过程的频率和强度增加；然而，我们对其机制和速度的了解仍然有限。我们研究了西伯利亚东部热侵蚀沟壑形成过程中的沉积结构、地表地形和天气条件，并监测了其在 2020 年至 2022 年间的变化。该冲沟的形成是由多个过程共同作用的结果：(1)几十年前，由于冬季道路对径流的拦截，沟谷的汇水面积被人为扩大；(2)冰缘退化导致地表径流集中在沟谷头部以上，而大量的地面结冰仍留在斜坡的其他部分，霜冻裂缝持续存在；(3)水进入霜冻裂缝后形成地下隧道；(4)沟谷出现前的高气温和强降雨导致隧道膨胀和顶部坍塌。两年后，沟壑的体积达到 1000 立方米，其中至少有 40% 是地面结冰。由于地冰融化导致水质明显清新，沟壑的形成并没有明显改变水的化学成分。

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来源期刊

Permafrost and Periglacial Processes 地学-地质学

CiteScore

9.70

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.