Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1088/1748-9326/11/4/045004
Ключевые слова: permafrost in Siberia, larch forests, landslides, GRACE, landslides hazard, permafrost melting, landslides in permafrost, Drought, Facings, Geodetic satellites, Permafrost, Satellite imagery, Soil moisture, Soils, Climate variables, Gravity recovery and climate experiment satellites, High resolution satellite imagery, Landslides hazards, Larch forest, Mean precipitation, SIBERIA, climate effect, coniferous forest, hazard assessment, image resolution, landslide, precipitation assessment, slope angle, snowmelt, soil water, Larix
Аннотация: Climate impact on landslide occurrence and spatial patterns were analyzed within the larch-dominant communities associated with continuous permafrost areas of central Siberia. We used high resolution satellite imagery (i.e. QuickBird, WorldView) to identify landslide scars over an area of 62 000 km(2). Landslide occurrence was analyzed with respect to climate variables (air temperature, precipitation, drought index SPEI), and Gravity Recovery and Climate Experiment satellite derived equivalent of water thickness anomalies (EWTA). Landslides were found only on southward facing slopes, and the occurrence of landslides increased exponentially with increasing slope steepness. Lengths of landslides correlated positively with slope steepness. The observed upper elevation limit of landslides tended to coincide with the tree line. Observations revealed landslides occurrence was also found to be strongly correlated with August precipitation (r = 0.81) and drought index (r = 0.7), with June-July-August soil water anomalies (i.e., EWTA, r = 0.68-0.7), and number of thawing days (i.e., a number of days with t(max) > 0 degrees C; r = 0.67). A significant increase in the variance of soil water anomalies was observed, indicating that occurrence of landslides may increase even with a stable mean precipitation level. The key-findings of this study are (1) landslides occurrence increased within the permafrost zone of central Siberia in the beginning of the 21st century; (2) the main cause of increased landslides occurrence are extremes in precipitation and soil water anomalies; and (3) landslides occurrence are strongly dependent on relief features such as southward facing steep slopes.
Журнал: ENVIRONMENTAL RESEARCH LETTERS
Выпуск журнала: Vol. 11, Is. 4
ISSN журнала: 17489326
Место издания: BRISTOL
Издатель: IOP PUBLISHING LTD
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