Geophysical methods help to assess potential groundwater extraction sites

Abstract

Complex geology in glacial terrain makes groundwater exploration challenging for water supply companies. Abrupt lateral changes of geological conditions, for example, raise the risk of unsuccessful exploration drilling. At some locations, local water supply companies experience a large number of dry wells, raising the need for better exploration approaches. The use of geophysical techniques enables the detection and characterization of subsurface structures in terms of aquifers and aquitards.We present two examples in which seismic and resistivity methods are combined for subsurface characterization. A thrust structure is detected in the Varde study area in Denmark and a channel structure is mapped in the Hamburg-Sülldorf study area in Germany. The different imaging characteristics of seismic P‑ and S‑waves are demonstrated. The combination of seismic and resistivity methods enables delineating groundwater-bearing and groundwater-barrier layers down to a depth of 150 m.

Robust 3D Joint Inversion of Gravity and Magnetic Data: A High-Performance Computing Approach

“…The following parametric functional expressed in its matrix form was used to make joint inversions of two types of geophysical data: (1) , α (2) ,β (1) ,β (2) ,γ (1) ,γ (2) ,η (1) ,η (2) ,µ (1) ,µ (2) ) (m (1) , m (2) )…”

“…Sci. 2023, 13, 11292 5 of 24 concatenated vectors and matrices of each input data type; in this case, gravimetric (1) and magnetic (2) data.…”

“…Geophysical methods are one of the main ways to study the Earth's crust and search and explore the mineral resources in the Earth's interior [1][2][3]. Geophysical methods can be classified based on the physical fields used in their application.…”

“…One of the fundamental challenges in geophysics is the calculation of distribution models of physical properties in the subsurface that can accurately reproduce measurements obtained in the field, in turn, these models are geologically possible in the context of the study area, which is known as inverse modeling. Any inversion problem is subject to three constraints: (1) the solution must exist, (2) the process is unstable, and (3) the solution is not unique [4,[8][9][10][11].…”

Employing Geophysical Techniques to Detect and Assess Groundwater Pollution at El-Akader Landfill North Jordan

“…The interpretation of geophysical results yields valued information to assess groundwater situation including the depth of water table. Electrical resistivity and electromagnetic methods are globally recognized techniques usually used for water exploration (Wiederhold et al, 2021;Ghanem et al, 2021).…”