A new high-resolution groundwater isoscape for south-east Germany: insights from differences in relation to precipitation

Gaillard A, van Geldern R, Barth J, Stumpp C (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Hydrology and Earth System Sciences European Geosciences Union (EGU) / Copernicus Publications

Book Volume: 29

Pages Range: 3853-3863

Journal Issue: 16

DOI: 10.5194/hess-29-3853-2025

Abstract

Stable water isotopes are important tracers in understanding interactions between all compartments of the hydrological cycle. Particularly in groundwater studies, isotopes have been used to assess the recharge and origin of groundwater. Based on high-density groundwater measurements from 596 measurement stations in an area of 70 500 km2, we produced a new interpolated map of the δ18O distribution (i.e. an isoscape) in the groundwater of southeast Germany. A comparison of this groundwater isoscape to the regional long-term precipitation isoscape showed differences of up to ±2 ％ between these two compartments. Groundwater was enriched in the light isotope 16O compared to precipitation in the alpine area, where recharge occurs mainly during winter and in recharge areas at higher altitudes. However, groundwater was enriched in the heavy isotope 18O with respect to precipitation in drier lowland regions where summer recharge, irrigation practices and aquifer types as well as evaporation processes may play a role. Further comparative studies between the stable water isotopes of precipitation and groundwater, including time series, are needed to further improve our understanding of the spatial and seasonal recharge patterns of groundwater.

Authors with CRIS profile

Aixala Gaillard Lehrstuhl für Angewandte Geologie Robert van Geldern Lehrstuhl für Angewandte Geologie Johannes Barth Lehrstuhl für Angewandte Geologie

Involved external institutions

Universität für Bodenkultur Wien (BOKU) / University of Natural Resources and Life Sciences, Vienna AT Austria (AT)

How to cite

APA:

Gaillard, A., van Geldern, R., Barth, J., & Stumpp, C. (2025). A new high-resolution groundwater isoscape for south-east Germany: insights from differences in relation to precipitation. Hydrology and Earth System Sciences, 29(16), 3853-3863. https://doi.org/10.5194/hess-29-3853-2025

MLA:

Gaillard, Aixala, et al. "A new high-resolution groundwater isoscape for south-east Germany: insights from differences in relation to precipitation." Hydrology and Earth System Sciences 29.16 (2025): 3853-3863.

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