Microbial communities of two deep (1,270 and 316 m) alkaline (pH 9.94 and 8.05), anaerobic (Eh, -137 and -27 mV) aquifers were characterized by rRNA-based analyses. Both aquifers, the Grande Ronde (GR) and Priest rapids (PR) formations, are located within the Columbia River Basalt Group in south-central Washington, and sulfidogenesis and methanogenesis characterize the GR and PR formations, res...

The population concentration in coastal areas and the increase of groundwater discharge in combination with the peculiarities of karstic coastal aquifers constitute a huge worldwide problem, which is particularly relevant for coastal aquifers of the Mediterranean basin. This paper offers a review of scientific activities realized to pursue the optimal utilization of Apulian coastal groundwater....

1. Abstract Two modelling challenges were encountered while building a data-driven predictive map of geothermal potential for the Great Basin in the western United States. The first was that many of the input evidence layers that represent young faults or active tectonics were not conditionally independent with regards to geothermal training sites. The second was that a significant portion of t...

A block-centered, finite difference model of two-dimensional groundwater flow yields velocity values at the midpoints of interfaces between adjacent blocks. Method of characteristics, random walk and particle-tracking models of solute transport equire velocities at arbitrary particle locations within the finite difference grid. Particle path lines and travel times are sensitive to the spatial i...

Extensive research has been conducted regarding the occurrence of herbicides in the hydrologic system, their fate, and their effects on human health and the environment. Few studies, however, have considered herbicide transformation products (degradates). In this study of Iowa ground water, herbicide degradates were frequently detected. In fact, herbicide degradates were eight of the 10 most fr...

Citation: Vega MA, Kulkarni HV, Mladenov N, Johannesson K, Hettiarachchi GM, Bhattacharya P, Kumar N, Weeks J, Galkaduwa M and Datta S (2017) Biogeochemical Controls on the Release and Accumulation of Mn and As in Shallow Aquifers, West Bengal, India. Front. Environ. Sci. 5:29. doi: 10.3389/fenvs.2017.00029 Biogeochemical Controls on the Release and Accumulation of Mn and As in Shallow Aquifers...

Massive usage, along with careless handling, storage, spills, and leakages made chloroethenes (CEs) one of the most abundant classes of groundwater contaminants. Anaerobic organohalide respiring bacteria (OHRB) can couple reductive dechlorination of CEs with energy conservation, a central microbial process in (enhanced) natural attenuation of CE-contaminated aquifers. Spatial variability of OHR...

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Abstract Univariate and bivariate spectral analyses were applied to the study of two karstic systems in the Central Apennines (Italy). The analyses allowed the characterization of the transformations between the input rainfall and the output discharge. Although the development of the karstification is very different, the two aquifers show very similar behaviour. Both systems present very high m...

Environmental concerns regarding the potential for drinking water contamination in shallow aquifers have accompanied unconventional energy development in the northern Appalachian Basin. These activities have also raised several critical questions about the hydrogeological parameters that control the naturally occurring presence and migration of hydrocarbon gases in shallow aquifers within petro...