FAIMON, Jiří, Dana TROPPOVÁ, Vít BALDÍK a Roman NOVOTNÝ. Air circulation and its impact on microclimatic variables in the Císařská Cave (Moravian Karst, Czech Republic). International Journal of Climatology. Chichester: John Wiley & Sons, 2012, roč. 32, č. 4, s. 599-623. ISSN 0899-8418. doi:10.1002/joc.2298.
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Základní údaje
Originální název Air circulation and its impact on microclimatic variables in the Císařská Cave (Moravian Karst, Czech Republic)
Název česky Air circulation and its impact on microclimatic variables in the Císařská Cave (Moravian Karst, Czech Republic)
Autoři FAIMON, Jiří (203 Česká republika, garant), Dana TROPPOVÁ (203 Česká republika, domácí), Vít BALDÍK (203 Česká republika, domácí) a Roman NOVOTNÝ (203 Česká republika, domácí).
Vydání International Journal of Climatology, Chichester, John Wiley & Sons, 2012, 0899-8418.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor Geochemie
Stát vydavatele Spojené státy
Utajení není předmětem státního či obchodního tajemství
Impakt faktor Impact factor: 2.886
Kód RIV RIV/00216224:14310/12:00057194
Organizační jednotka Přírodovědecká fakulta
Doi http://dx.doi.org/10.1002/joc.2298
UT WoS 000301494600010
Klíčová slova česky airflow; cave; CO2; humidity; oscillations; temperature; ventilation mode; ventilation period
Klíčová slova anglicky airflow; cave; CO2; humidity; oscillations; temperature; ventilation mode; ventilation period
Štítky AKR, rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Ing. Andrea Mikešková, učo 137293. Změněno: 22. 4. 2013 13:46.
Anotace
Airflows and their impact on microclimatic parameters were studied in the two entranced Císařská Cave (Moravian Karst, Czech Republic). Basing on the airflow direction with respect to the upper entrance (UE) and lower entrance (LE), three ventilation modes were distinguished: upward airflow one (UAF mode), downward airflow one (DAF mode), and transitional mode. A switching between the UAF and DAF happens in the transitional mode, in the range of external temperatures from 9.5 to 11.1 C. Basing on the extent of cave ventilation, a period of active ventilation and period of stagnant ventilation were recognised. The cave air is intensively exchanged with external airs during the active ventilation period when the cave persists in either the DAF or UAF mode. During the stagnant ventilation period, the single airflow modes switch during diurnal cycle and only cave entering passages are vented (impacted). The airflows were found to depend (i) linearly on the differences in cave-outdoor air densities, (ii) nonlinearly on the external temperature, and (iii) both linearly (LE) and non-linearly (UE) on the temperature gradient. Majority of the airflows showed high frequency oscillations with the period from tens of seconds to minutes and with the amplitude up to 0.1 m3/s. Different airflow spectra were found at the individual entrances. The highest spectral densities were registered at low driving forces. The air circulation changed the pattern of temperature distribution depending on the ventilation mode and ventilation period. The cave relaxation length varied in the extreme range from 1 to 69.6 m. The asymptotic temperature and asymptotic specific humidity varied from 7.5 to 11.8 C, and from 5.47 to 7.15 kg/kg, respectively. The impact of airflows on the cave CO2 levels is discussed based on a dynamic model.
Anotace česky
Airflows and their impact on microclimatic parameters were studied in the two entranced Císařská Cave (Moravian Karst, Czech Republic). Basing on the airflow direction with respect to the upper entrance (UE) and lower entrance (LE), three ventilation modes were distinguished: upward airflow one (UAF mode), downward airflow one (DAF mode), and transitional mode. A switching between the UAF and DAF happens in the transitional mode, in the range of external temperatures from 9.5 to 11.1 C. Basing on the extent of cave ventilation, a period of active ventilation and period of stagnant ventilation were recognised. The cave air is intensively exchanged with external airs during the active ventilation period when the cave persists in either the DAF or UAF mode. During the stagnant ventilation period, the single airflow modes switch during diurnal cycle and only cave entering passages are vented (impacted). The airflows were found to depend (i) linearly on the differences in cave-outdoor air densities, (ii) nonlinearly on the external temperature, and (iii) both linearly (LE) and non-linearly (UE) on the temperature gradient. Majority of the airflows showed high frequency oscillations with the period from tens of seconds to minutes and with the amplitude up to 0.1 m3/s. Different airflow spectra were found at the individual entrances. The highest spectral densities were registered at low driving forces. The air circulation changed the pattern of temperature distribution depending on the ventilation mode and ventilation period. The cave relaxation length varied in the extreme range from 1 to 69.6 m. The asymptotic temperature and asymptotic specific humidity varied from 7.5 to 11.8 C, and from 5.47 to 7.15 kg/kg, respectively. The impact of airflows on the cave CO2 levels is discussed based on a dynamic model.
Návaznosti
GA205/03/1128, projekt VaVNázev: Recentní krasové procesy: destrukce speleotém
Investor: Grantová agentura ČR, Standardní projekty
MSM 143100004, záměrNázev: Geologické procesy a jejich environmentální vyústění - styk variscid a alpid
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Výzkumné záměry
MSM0021622412, záměrNázev: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Akronym: INCHEMBIOL)
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Výzkumné záměry
VytisknoutZobrazeno: 22. 4. 2021 02:39