Press Release 018/2022

Groundwater Level Threatens to Fall in Germany Due to Climate Change

KIT and BGR Develop AI-based Models to Forecast Future Development of the Groundwater Level
2022_018_Infolge des Klimawandels drohen in Deutschland sinkende Grundwasserspiegel_1_72dpi
KIT researchers study future development of the groundwater level. Forecasts reveal: Groundwater levels in Germany threaten to fall in the next decades. (Photo: Markus Breig, KIT)

Climate change directly affects groundwater resources. Groundwater levels in Germany threaten to fall in the next decades. This is the result of a study made by Karlsruhe Institute of Technology (KIT) and the Federal Institute for Geosciences and Natural Resources (BGR). It is now published in Nature Communications. 
(DOI: 10.1038/s41467-022-28770-2)

The experts from BGR and KIT used AI-based forecast models to find out how climate change will affect groundwater resources in Germany in the 21st century. They applied deep learning methods to assess on the basis of groundwater data from all over the Germany the development of groundwater levels for different locations and climate scenarios defined by the Intergovernmental Panel on Climate Change (IPCC). These scenarios ranged from an assumed increase of global mean temperature by less than 2 degrees Celsius until 2100, the target defined by the Paris Climate Agreement, to a moderate scenario (plus 2.6 degrees) to the so-called business-as-usual scenario that is based on the absence of any climate protection measures and an increase in temperature by up to 5 degrees compared to the pre-industrial level. “Our scientific study exclusively covered direct climatic impacts and changes. Anthropogenic factors, such as groundwater extraction, were not considered,” says Andreas Wunsch from KIT’s Institute of Applied Geosciences (AGW), first author of the study.

Links: Darstellung der mittleren Änderungen des Grundwasserspiegels, Rechts: „Heatmaps“
Left: Mean changes of the groundwater level (in percent) in 2100 compared to 2014 for all locations studied and climate projections for the business-as-usual scenario.
Right: Heat maps of the modeled groundwater levels for an exemplary location. (Graphics: KIT/BGR)

Forecasts Reveal: Falling Groundwater Levels Are Independent of the Scenario

According to the experts, all three climate scenarios studied lead to more or less strong developments with droughts, falling groundwater levels, and a changed water availability. While less pronounced trends were obtained for the two more optimistic scenarios, KIT and BGR experts found a trend towards significantly falling groundwater levels at most locations for the strongest of the three warming scenarios. “The results of this prognosis are particularly relevant to the near future, as this scenario is closest to today’s situation,” says Dr. Tanja Liesch, AGW.

“Future negative impacts will be particularly visible in North and East Germany, where the corresponding developments have already started. Here, longer periods of low groundwater levels threaten to occur by the end of the century in particular,” says Dr. Stefan Broda, BGR. For the two weaker warming scenarios, this trend is not that severe. KIT and BGR experts think that this indicates that the reduction of greenhouse gas emissions may have a positive impact on future groundwater levels. 

The published results were obtained within the BGR project MENTOR that is aimed at developing an AI-based method for nationwide forecast of groundwater levels. (le-swi)

Original Publication
Andreas Wunsch, Tanja Liesch & Stefan Broda: Deep learning shows declining groundwater levels in Germany until 2100 due to climate change. Nature Communications, 2022. DOI: 10.1038/s41467-022-28770-2.

More about the KIT Climate and Environment Center: 

Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 10,000 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,800 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

le-swi, 09.03.2022

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