FAIMON, Jiří and Marek LANG. Variances in airflows during different ventilation modes in a dynamic U-shaped cave. International Journal of Speleology. Tampa, FL (USA): Union Internationale de Spéléologie, 2013, vol. 42, No 2, p. 115-122. ISSN 0392-6672. Available from: https://dx.doi.org/10.5038/1827-806X.42.2.3. |
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@article{1109058, author = {Faimon, Jiří and Lang, Marek}, article_location = {Tampa, FL (USA)}, article_number = {2}, doi = {http://dx.doi.org/10.5038/1827-806X.42.2.3}, keywords = {airflow; air density; cave; temperature difference; temperature profile; ventilation mode; conceptual model}, language = {eng}, issn = {0392-6672}, journal = {International Journal of Speleology}, title = {Variances in airflows during different ventilation modes in a dynamic U-shaped cave}, volume = {42}, year = {2013} }
TY - JOUR ID - 1109058 AU - Faimon, Jiří - Lang, Marek PY - 2013 TI - Variances in airflows during different ventilation modes in a dynamic U-shaped cave JF - International Journal of Speleology VL - 42 IS - 2 SP - 115-122 EP - 115-122 PB - Union Internationale de Spéléologie SN - 03926672 KW - airflow KW - air density KW - cave KW - temperature difference KW - temperature profile KW - ventilation mode KW - conceptual model N2 - 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 on balancing 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. ER -
FAIMON, Jiří and Marek LANG. Variances in airflows during different ventilation modes in a dynamic U-shaped cave. \textit{International Journal of Speleology}. Tampa, FL (USA): Union Internationale de Spéléologie, 2013, vol.~42, No~2, p.~115-122. ISSN~0392-6672. Available from: https://dx.doi.org/10.5038/1827-806X.42.2.3.
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