The aim of the study is to illustrate the thermal dynamics of a ponor, the Andrassa cave (Italy). We examined the hygrothermic Spring and Winter conditions. These first data provide some interesting indications on the circulation of air into the cave. Indirectly, the temperature distribution in the air and ground indicates the direction of air flow, even when the flows are too slow for direct measurements. According to bibliography, the ponor morphology is expected to lead to a circulation "air bag", where the winter temperature is determined by a convective circulation fuelled by the entrance. Instead, the evidence shows that the water (of oozing and surface runoff) in Andrassa cave influence the ground temperatures more than air. This probably happens in all caves with an important water flow. If confirmed, this would be a strong limit to the number of caves that have actually a circulation "air bag".
Preliminary data on the temperature distribution in a ponor (Andrassa, Ligurian Alps)
MOTTA, Michele;MOTTA, LUIGI
2016-01-01
Abstract
The aim of the study is to illustrate the thermal dynamics of a ponor, the Andrassa cave (Italy). We examined the hygrothermic Spring and Winter conditions. These first data provide some interesting indications on the circulation of air into the cave. Indirectly, the temperature distribution in the air and ground indicates the direction of air flow, even when the flows are too slow for direct measurements. According to bibliography, the ponor morphology is expected to lead to a circulation "air bag", where the winter temperature is determined by a convective circulation fuelled by the entrance. Instead, the evidence shows that the water (of oozing and surface runoff) in Andrassa cave influence the ground temperatures more than air. This probably happens in all caves with an important water flow. If confirmed, this would be a strong limit to the number of caves that have actually a circulation "air bag".File | Dimensione | Formato | |
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