Monitoring Fresh-Brackish and Brackish-Saline Groundwater Interface Depths in the North Limburg Venlo Graben (the Netherlands) using Repeated Electrical Sounding with initial Subsurface Models
Abstract
A new standardised and objective working method, FBSI4REGIS2VES was developed for the inversion of Vertical Electrical Sounding (VES) curves to estimate the depths of the fresh-brackish and brackish-saline groundwater interfaces (FBSI). The method enables the detection of changes in FBSI at depths up to 300 m from repeated VES measurements in a monitoring setting. Incorporating prior information from the REGIS II hydrogeological model improves the absolute estimation of the FBSI. At 9 repeated VES locations in the North Limburg Venlo Graben study area, the FBSI shows little consistent change over time, and no structural FBSI rise was observed in the area of investigation.
Fields of Study & Subjects
Geophysical and Geoelectrical Methods
Groundwater flow and contamination studies
Water Quality and Resources Studies
Publication details
- Journal / source
- First Break
- Volume
- 44
- Issue
- 3
- Pages
- 47–53
- Publication date
- 1 March 2026
- Language
- EN