Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Air-convection-reflective sheds: A mitigation technique that stopped degradation and promoted permafrost recovery under the Alaska Highway, south-western Yukon, Canada
Abstract This study tested the efficacy of air-convection-reflective sheds (ACRS) installed along the Alaska Highway in Yukon (Canada) as a mitigation technique to reduce heat absorption during the thawing season and to increase heat loss during the freezing season. Soil surface, air, and ground temperatures were recorded under the ACRS between 2008 and 2016, which were then compared with values from an unmitigated road embankment and from the natural ground near the road embankment. The design of the ACRS blocked incoming solar radiation, prevented snow accumulation, and promoted air convection through the stack effect, which resulted in a cooling efficiency of 358% compared to the reference site. The net heat loss resulted in a 6.3 °C cooling of the average soil surface temperature and caused the active layer thickness to decrease by nearly two meters, thus stopping permafrost warming and promoting permafrost recovery and its upward aggradation in the embankment. Implementations of the ACRS in specific vulnerable or degraded sections of roads and airstrips represents a viable solution to permafrost thaw and embankment failure.
Highlights Air-convection-reflective sheds (ACRS) were used to mitigate permafrost thaw. They decreased average soil surface temperature by 6.3 °C compared to a reference site. The cooling effect of the ACRS was apparent down to a depth of 15 m after 4–5 years. Freezing season cooling was >7 times as effective as that during the thawing season. ACRS are an effective method to mitigate permafrost thaw in vulnerable areas.
Air-convection-reflective sheds: A mitigation technique that stopped degradation and promoted permafrost recovery under the Alaska Highway, south-western Yukon, Canada
Abstract This study tested the efficacy of air-convection-reflective sheds (ACRS) installed along the Alaska Highway in Yukon (Canada) as a mitigation technique to reduce heat absorption during the thawing season and to increase heat loss during the freezing season. Soil surface, air, and ground temperatures were recorded under the ACRS between 2008 and 2016, which were then compared with values from an unmitigated road embankment and from the natural ground near the road embankment. The design of the ACRS blocked incoming solar radiation, prevented snow accumulation, and promoted air convection through the stack effect, which resulted in a cooling efficiency of 358% compared to the reference site. The net heat loss resulted in a 6.3 °C cooling of the average soil surface temperature and caused the active layer thickness to decrease by nearly two meters, thus stopping permafrost warming and promoting permafrost recovery and its upward aggradation in the embankment. Implementations of the ACRS in specific vulnerable or degraded sections of roads and airstrips represents a viable solution to permafrost thaw and embankment failure.
Highlights Air-convection-reflective sheds (ACRS) were used to mitigate permafrost thaw. They decreased average soil surface temperature by 6.3 °C compared to a reference site. The cooling effect of the ACRS was apparent down to a depth of 15 m after 4–5 years. Freezing season cooling was >7 times as effective as that during the thawing season. ACRS are an effective method to mitigate permafrost thaw in vulnerable areas.
Air-convection-reflective sheds: A mitigation technique that stopped degradation and promoted permafrost recovery under the Alaska Highway, south-western Yukon, Canada
Gagnon, Samuel (Autor:in) / Fortier, Daniel (Autor:in) / Sliger, Michel (Autor:in) / Rioux, Karine (Autor:in)
22.02.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| DOAJ | 2013
| IOP Institute of Physics | 2013
Permafrost probability modeling above and below treeline, Yukon, Canada
| Online Contents | 2012
Permafrost probability modeling above and below treeline, Yukon, Canada
| Elsevier | 2012