Dear Colleagues,

Pressure in water resources is increasing rapidly as a result of climate change and the growing population. In this context, urban groundwater plays an essential role as a strategic resource for the development of cities, and must be preserved. However, a wide variety of human/urban related activities modify the physico-chemical conditions of urban aquifers, including among others:

• The release of chemicals from sources such as wastewater (through direct discharges or leaky sewers) and urban runoff.
• The introduction of contaminants of emerging concern such as pharmaceuticals, personal care products, illicit drugs, etc.
• The introduction of industrial compounds such as chlorinated solvents, perfluorinated compounds, etc.
• The interaction with underground constructions.
• The alteration of baseflow and surface water quality.
• The modification of transit times.
• The use of shallow aquifers for geothermal energy.
• The increase of urbanized areas and sealed surfaces.
• The alteration of the fresh–salt water interface in coastal aquifers (i.e., saltwater intrusion).

Accordingly, it is of paramount importance to qualitatively and quantitatively assess the aspects that may alter the physico-chemical conditions of urban aquifers, and to develop methods for preserving them.

This Special Issue welcomes contributions (laboratory and pilot-scale experiments, case studies, numerical investigations, etc.) focused on urban groundwater resources.

Dr. Miao Jing
Guest Editor

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• urban aquifer
• groundwater quality
• groundwater contamination
• baseflow
• groundwater recharge
• sealed surface
• surface water–groundwater interaction