دورية أكاديمية
Monitoring and simulation of hydrothermal conditions indicating the deteriorating stability of a perennially frozen moraine dam in the Himalayas
| العنوان: | Monitoring and simulation of hydrothermal conditions indicating the deteriorating stability of a perennially frozen moraine dam in the Himalayas |
|---|---|
| المؤلفون: | XIN WANG, CHENGDE YANG, YANLIN ZHANG, KAILGUO CHAI, SHIYIN LIU, YONGJIAN DING, JUNFENG WEI, YONG ZHANG, YONGSHUN HAN |
| المصدر: | Journal of Glaciology, Vol 64, Pp 407-416 (2018) |
| بيانات النشر: | Cambridge University Press, 2018. |
| سنة النشر: | 2018 |
| المجموعة: | LCC:Environmental sciences LCC:Meteorology. Climatology |
| مصطلحات موضوعية: | glacier stability, hydrothermal state, moraine dam, Environmental sciences, GE1-350, Meteorology. Climatology, QC851-999 |
| الوصف: | Thermal and hydrological dynamics and their impacts on the stability of a moraine dam were analyzed and simulated for the Longbasaba Lake in the Himalaya, based on soil temperature, moisture and heat flux data observed at different depths in the dam from 2012 to 2016. Annual average heat income is greater than heat expenditure on the dam surface. The mean annual temperature at observed the depths of 0–150 cm is >0°C, although the average annual air temperature was −3.6°C over the dam, indicating a relatively larger temperature difference between moraine dam and air. The volumetric soil moisture content is relatively low with an annual average of 5%, peaking after the snow cover melting and active layer thawing. Simulation results indicate that the average yearly maximum thawing depth has been ~0.3 m deeper than the average yearly maximum freezing depth during the observation period. In the past 55 years, the yearly maximum thawing depth has increased, while yearly maximum freezing depth has decreased, implying that the permafrost in the dam has been deteriorating. The annual surplus heat and increasing permafrost thawing depth will result in further deterioration of permafrost and melting of buried ice in the dam, thereby decreasing its stability. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0022-1430 1727-5652 |
| Relation: | https://www.cambridge.org/core/product/identifier/S0022143018000382/type/journal_article; https://doaj.org/toc/0022-1430; https://doaj.org/toc/1727-5652 |
| DOI: | 10.1017/jog.2018.38 |
| URL الوصول: | https://doaj.org/article/d91197b451eb4e9688c1f285b9a86ac3 |
| رقم الأكسشن: | edsdoj.91197b451eb4e9688c1f285b9a86ac3 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 00221430 17275652 |
|---|---|
| DOI: | 10.1017/jog.2018.38 |