Variances in airflows during different ventilation modes in a dynamic U-shaped cave

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F13%3A00068437" target="_blank" >RIV/00216224:14310/13:00068437 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.5038/1827-806X.42.2.3" target="_blank" >http://dx.doi.org/10.5038/1827-806X.42.2.3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5038/1827-806X.42.2.3" target="_blank" >10.5038/1827-806X.42.2.3</a>

Result language
angličtina
Original language name
Variances in airflows during different ventilation modes in a dynamic U-shaped cave
Original language description
Airflow dynamics were studied in Císařská Cave (Moravian Karst, Czech Republic) under different seasonal conditions. The dependence of airflows on the difference between external and cave temperatures is nonlinear and roughly obeys the Darcy-Weisbach equation. The upward airflows were found to be systematically higher than the downward airflows under comparable driving forces. The principle reason is nonlinearity between air temperature and air density. U-shaped cave geometry magnifies this effect by feedback between external temperature and airflow driving forces. Whereas this feedback is positive during the upward airflow ventilation mode, it is negative during the downward airflow mode. To discuss the behavior in detail, a simplified model based onbalancing the masses of two equivalent air columns of different temperatures and densities is proposed. The results contribute to a better understanding of cave microclimate evolution, cave CO2 dynamics, and speleothem growth.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DD - Geochemistry
OECD FORD branch
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Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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