Characterising thermal water circulation in fractured bedrock using a multidisciplinary approach: a case study of St. Gorman’s Well, Ireland

A hydrogeological conceptual model of the source, circulation pathways and temporal variation of a low-enthalpy thermal spring in a fractured limestone setting is derived from a multidisciplinary approach. St. Gorman’s Well is a thermal spring in east-central Ireland with a complex and variable temperature profile (maximum of 21.8 °C). Geophysical data from a three-dimensional(3D)audio-magnetotelluric(AMT) survey are combined with time-lapse hydrogeological data and information from a previously published hydrochemical analysis to investigate the operation of this intriguing hydrothermal system. Hydrochemical analysis and time-lapse measurements suggest that the thermal waters flow within the fractured limestones of the Carboniferous Dublin Basin at all times but display variability in discharge and temperature. The 3D electrical resistivity model of the subsurface revealed two prominent structures: (1) a NW-aligned faulted contact between two limestone lithologies; and (2) a dissolutionally enhanced, N-aligned, fault of probable Cenozoic age. The intersection of these two structures, which has allowed for karstification of the limestone bedrock, has created conduits facilitating the operation of relatively deep hydrothermal circulation (likely estimated depths between 240 and 1,000 m) within the limestone succession of the Dublin Basin. The results of this study support a hypothesis that the maximum temperature and simultaneous increased discharge observed at St. Gorman’s Well each winter is the result of rapid infiltration, heating and recirculation of meteoric waters within a structurally controlled hydrothermal circulation system.

Assessment Of Hydrochemical Analysis And Phytoplankton Community Of Different Ponds Of A Fish Farm

The article presents the results of the hydrochemical analysis and phytoplankton composition study of the "Namangan Balyk" fish farm’s ponds. The species composition, biomass, and seasonal dynamics of phytoplankton in these ponds were calculated and analyzed for the first time.

COMPARATIVE ANALYSIS OF THE HYDROCHEMICAL INDICATORS OF THE WATERS OF THE FINSKIY BAY IN THE AREA OF ST. PETERSBURG

Now the Finskiy bay is actively used for the everyday needs of the population of St. Petersburg. Therefore, in various districts of the city, a hydrochemical analysis of the waters of the Finskiy bay was carried out and the concentrations of nitrates, nitrites, ions of copper, iron, silicon, ammonium, as well as carbonate hardness and pH were determined. As a result of the study, it was found that all studied parameters, except for iron ions, do not exceed the MPC.

Assessment of the geoecological state of surface watercourses in the Slavsky district, Kaliningrad region (summer hydrological season)

The paper provides an assessment of the geoecological state of surface watercourses in the Slavsky district, Kaliningrad region in the summer hydrological season. For this purpose, the choice of watercourses for research was carried out, which, in aggregate, could characterize the river network of the Slavsky district as a whole, they were: r. Zlaya, r. Shluzovaya, r. Nemoninka and r. Osa. Water samples were taken for hydrochemical analysis and the hydrometric characteristics of the rivers were measured. The research resulted in information on the quality of water in rivers, as well as on the role of anthropogenic and natural influences on it.