Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China
In the northern Da Xing’anling Mountains in Northeast China on the southern margin of the Eastern Asia permafrost body, the ground thermal state and boreal ecological environment are sensitive to climate change and human activities. Since the 1980s, the Hola Basin here has been continuously and exte...
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ftdoajarticles:oai:doaj.org/article:bbc107c850ae48efb16c466e280cc6b1 2023-05-15T17:55:33+02:00 Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China Ruixia He Yan Li Huijun Jin Hongwei Wang Xiaoying Jin Meiquan Zhu Xinyu Li Yadong Huang Doudou Jin Futing Ma 2022-01-01T00:00:00Z https://doi.org/10.3389/feart.2022.806022 https://doaj.org/article/bbc107c850ae48efb16c466e280cc6b1 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.806022/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.806022 https://doaj.org/article/bbc107c850ae48efb16c466e280cc6b1 Frontiers in Earth Science, Vol 10 (2022) strip coalmine Xing’an permafrost open-pit backfilling thermal recovery influencing factor Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.806022 2022-12-31T10:52:21Z In the northern Da Xing’anling Mountains in Northeast China on the southern margin of the Eastern Asia permafrost body, the ground thermal state and boreal ecological environment are sensitive to climate change and human activities. Since the 1980s, the Hola Basin here has been continuously and extensively developed. In particular, open pits and later backfilling in strip coal mining alters land–atmospheric hydrothermal exchanges in permafrost regions, leading to serious damages to the permafrost environment and boreal forest. After mining, pits need to be backfilled timely and properly for hydrothermal recovery of Xing’an permafrost and the boreal ecological environment. In this study, based on the comparative analysis of monitored ground temperatures in backfilled and undisturbed areas, influencing factors of thermal recovery after backfilling were analyzed through numerical simulations. Results show that the thermal recovery of permafrost in the backfilled area is closely related to temperature, depth, material, and soil moisture content of backfill. The warmer, finer, and thicker the backfill soils, the longer the permafrost recovery. Thermal recovery of permafrost also depends on the moisture content of backfill; the shortest recovery occurs at 15–25% in the backfilled soil moisture content. Based on numerical simulations and combined with enlightenments from features of the ecosystem-protected Xing’an permafrost in Northeast China, a composite configuration of organic soil, crush-rock layer, and proper re-vegetation measures is advised. Based on prudent regulation of heat transfer modes, this composite backfilling method can effectively cool the backfilled ground and can even possibly offset the climate warming. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Frontiers in Earth Science 10 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
strip coalmine Xing’an permafrost open-pit backfilling thermal recovery influencing factor Science Q |
spellingShingle |
strip coalmine Xing’an permafrost open-pit backfilling thermal recovery influencing factor Science Q Ruixia He Yan Li Huijun Jin Hongwei Wang Xiaoying Jin Meiquan Zhu Xinyu Li Yadong Huang Doudou Jin Futing Ma Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
topic_facet |
strip coalmine Xing’an permafrost open-pit backfilling thermal recovery influencing factor Science Q |
description |
In the northern Da Xing’anling Mountains in Northeast China on the southern margin of the Eastern Asia permafrost body, the ground thermal state and boreal ecological environment are sensitive to climate change and human activities. Since the 1980s, the Hola Basin here has been continuously and extensively developed. In particular, open pits and later backfilling in strip coal mining alters land–atmospheric hydrothermal exchanges in permafrost regions, leading to serious damages to the permafrost environment and boreal forest. After mining, pits need to be backfilled timely and properly for hydrothermal recovery of Xing’an permafrost and the boreal ecological environment. In this study, based on the comparative analysis of monitored ground temperatures in backfilled and undisturbed areas, influencing factors of thermal recovery after backfilling were analyzed through numerical simulations. Results show that the thermal recovery of permafrost in the backfilled area is closely related to temperature, depth, material, and soil moisture content of backfill. The warmer, finer, and thicker the backfill soils, the longer the permafrost recovery. Thermal recovery of permafrost also depends on the moisture content of backfill; the shortest recovery occurs at 15–25% in the backfilled soil moisture content. Based on numerical simulations and combined with enlightenments from features of the ecosystem-protected Xing’an permafrost in Northeast China, a composite configuration of organic soil, crush-rock layer, and proper re-vegetation measures is advised. Based on prudent regulation of heat transfer modes, this composite backfilling method can effectively cool the backfilled ground and can even possibly offset the climate warming. |
format |
Article in Journal/Newspaper |
author |
Ruixia He Yan Li Huijun Jin Hongwei Wang Xiaoying Jin Meiquan Zhu Xinyu Li Yadong Huang Doudou Jin Futing Ma |
author_facet |
Ruixia He Yan Li Huijun Jin Hongwei Wang Xiaoying Jin Meiquan Zhu Xinyu Li Yadong Huang Doudou Jin Futing Ma |
author_sort |
Ruixia He |
title |
Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
title_short |
Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
title_full |
Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
title_fullStr |
Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
title_full_unstemmed |
Thermal Recovery of Backfilled Pit in the Gulianhe Strip Coalmine in the Hola Basin in Northern Da Xing’Anling Mountains, NE China |
title_sort |
thermal recovery of backfilled pit in the gulianhe strip coalmine in the hola basin in northern da xing’anling mountains, ne china |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.806022 https://doaj.org/article/bbc107c850ae48efb16c466e280cc6b1 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.806022/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.806022 https://doaj.org/article/bbc107c850ae48efb16c466e280cc6b1 |
op_doi |
https://doi.org/10.3389/feart.2022.806022 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766163504974266368 |