Informace o publikaci

Continuous monitoring of the hydrogeochemical properties of the Amatérská cave waters



Rok publikování 2022
Druh Konferenční abstrakty
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Přiložené soubory
Popis In the period from June 2020 to June 2022, continuous monitoring of the cave environment parameters was carried out in the AmatérskáCave (Moravian Karst, Czech Republic) to assess the risk factors associated mainly with the surface above the cave. The research was carried out both by monthly sampling of the cave water, but also in the period from May 2021 usinginstruments specially designed to monitor the hydrogeochemical properties of dripwaters(discharge, conductivity, pH, temperature). The obtained data were compared with microclimatic parameters (air temperature, air CO2) and surface parameters (precipitation, temperature, soil CO2). Monitored dripswere selected with respect to their position in the cave system and the situation on the surface above the cave at four sites – E (under mixed forest), K (transition between forest and grassed area), M (grassed area) and N (former arable land).A comparison of the monthlyand continuous dischargemonitoring shows that the repetitivemeasurements usually registerthe main trends, nevertheless,very large variations can occur in the intermediate period. Continuous monitoring also registers seasonal variations in parametersshowingdifferences between the monitored sites.In terms of discharge, most drip watersshowed a relatively high variability –whilethe discharge washighat the beginning (1-2.5 l/hr), the overall trend was diminishing, with values between 0.01-1 l/hr towards the end. WhileE showedthehighest andmost stable values, whileM (which temporarily completely dried up) and N the greatest decline. The situation is probably influenced by the above-averagerainfall/infiltration year 2020(in the context of recent droughts). In addition, there is aclear trend in conductivity (with summer and winter), which is also usually positively correlated with discharge. The pH is very stable in some waters(e.g.,E), while in others itshows strong seasonality(e.g.,M shows differenceof up to 0.6 between summer and winter), which is most probably tiedto CO2 variations. In terms of the response of waterproperties to surface conditions, most dripsshow no direct correlation with precipitation, with only one (N) showing a very weak correlation (corr. coeff. 0.11). It can be inferred fromcross-correlations that thehydrological response in drips lags2-3 daysafter rainfall.All drip-sitesshow seasonal variations in supersaturationwith respectto calcite (max. in winter, min. in summer). SitesK and Mshowedlong periods when water can be significantly aggressive.
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