Jost Hellwig
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View article: Comprehensive mapping and classification of Germany’s drinking water protection areas
Comprehensive mapping and classification of Germany’s drinking water protection areas Open
Groundwater supplies up to 65% of drinking water in the European Union and approximately 70% in Germany, making it essential to preserve both its quality and quantity. However, climate change, land use pressures, and socio-economic develop…
View article: Comprehensive Mapping and Classification of Germany’s Drinking Water Protection Areas
Comprehensive Mapping and Classification of Germany’s Drinking Water Protection Areas Open
Groundwater supplies up to 65% of drinking water in the European Union and approximately 70% in Germany, making it essential to preserve both its quality and quantity. However, climate change, land use pressures, and socio-economic develop…
View article: Integration of agricultural, hydrological and hydrogeological stressors into the modelling of groundwater used for drinking water extraction
Integration of agricultural, hydrological and hydrogeological stressors into the modelling of groundwater used for drinking water extraction Open
Groundwater is Germany's dominant source of drinking water; in particular near-surface groundwater resources. Long-known pressures as well as emerging stressors such as unprecedented hydrological extremes, their related water quality issue…
View article: An investigation of anthropogenic influences on hydrologic connectivity using model stress tests
An investigation of anthropogenic influences on hydrologic connectivity using model stress tests Open
Human influences threaten environmental flows directly or indirectly through groundwater abstraction. In alluvial geological settings, these may affect the contributions from groundwater-sustaining streamflow during dry summer months. The …
View article: Situation and stresses: a spatial analysis of near-surface drinking water resources in Germany 
Situation and stresses: a spatial analysis of near-surface drinking water resources in Germany  Open
Decreasing groundwater recharge and competing water uses challenge drinking water supplies worldwide and noticeably in Germany as well. Groundwater is a significant source of drinking water, making it essential to maintain its quality and …
View article: Comment on hess-2023-243
Comment on hess-2023-243 Open
Abstract. Worldwide, human influences directly and indirectly threaten environmental flows through groundwater (GW) abstraction. This highlights the need to consider GW withdrawals together with climatic changes in future water management …
View article: Comment on hess-2023-243
Comment on hess-2023-243 Open
Abstract. Worldwide, human influences directly and indirectly threaten environmental flows through groundwater (GW) abstraction. This highlights the need to consider GW withdrawals together with climatic changes in future water management …
View article: An investigation of anthropogenic influences on hydrologic connectivity using stress tests
An investigation of anthropogenic influences on hydrologic connectivity using stress tests Open
Worldwide, human influences directly and indirectly threaten environmental flows through groundwater (GW) abstraction. This highlights the need to consider GW withdrawals together with climatic changes in future water management plans to m…
View article: A model ensemble-elasticity-stress test for drought impact on spring discharge and low flow
A model ensemble-elasticity-stress test for drought impact on spring discharge and low flow Open
Increasingly severe drought events demand a basis for prioritizing water uses and protection goals. In addition to classical methods of hydrological design, model experiments can support such aims. They can help investigate the response of…
View article: Drought propagation in space and time: the role of groundwater flows
Drought propagation in space and time: the role of groundwater flows Open
Droughts cause large economic and social impacts all over the world. During drought, groundwater maintains streamflow and can help to mitigate impacts. It governs how drought propagates through the hydrological cycle. Groundwater flows bet…
View article: Post‐drought increase in regional‐scale groundwater nitrate in southwest Germany
Post‐drought increase in regional‐scale groundwater nitrate in southwest Germany Open
Elevated nitrate concentrations in groundwater are a common challenge for water management. One important factor in this context is higher frequencies and intensities of wet‐dry cycles that may cause increased nitrate concentrations in gro…
View article: Stress-testing groundwater and baseflow drought sensitivity to recharge
Stress-testing groundwater and baseflow drought sensitivity to recharge Open
<p>Groundwater is the main source of freshwater and maintains streamflow during drought. Potential future groundwater and baseflow drought hazards depend on the systems' sensitivity to altered recharge conditions. We performed ground…
View article: Groundwater and baseflow drought responses to synthetic recharge stress tests
Groundwater and baseflow drought responses to synthetic recharge stress tests Open
Groundwater is the main source of freshwater and maintains streamflow during drought. Potential future groundwater and baseflow drought hazards depend on the systems' sensitivity to altered recharge conditions. We performed groundwater mod…
View article: Stress-testing groundwater and baseflow drought responses to synthetic climate change-informed recharge scenarios
Stress-testing groundwater and baseflow drought responses to synthetic climate change-informed recharge scenarios Open
Groundwater is the main source of freshwater and maintains streamflow during drought. Potential future groundwater and baseflow drought hazards depend on systems' sensitivity to altered recharge conditions. We performed groundwater model e…
View article: Stress test modelling to assess catchment drought resistance and recovery
Stress test modelling to assess catchment drought resistance and recovery Open
<p>Dry spells and heat waves control the frequency and duration of streamflow drought events. Groundwater storage and release in catchments can modulate their timing and severities in terms of deficit volume and persistence. To bette…
View article: Large‐Scale Assessment of Delayed Groundwater Responses to Drought
Large‐Scale Assessment of Delayed Groundwater Responses to Drought Open
Groundwater is a vital resource for freshwater supply during extended droughts and also a key storage governing drought propagation through the hydrological cycle. Current drought monitoring lacks large‐scale estimates of groundwater droug…
View article: An assessment of trends and potential future changes in groundwater-baseflow drought based on catchment response times
An assessment of trends and potential future changes in groundwater-baseflow drought based on catchment response times Open
Drought is an important natural hazard with large impacts on society. Changes in drought characteristics have been studied for different parts of the hydrological cycle, but insights into changes of groundwater resources are obscured due t…
View article: An assessment of trends and potential future changes in groundwater-baseflow drought based on catchment response times
An assessment of trends and potential future changes in groundwater-baseflow drought based on catchment response times Open
Drought is an important natural hazard with large impacts on society. Changes in drought characteristics have been studied for different parts of the hydrological cycle, but insights in changes of groundwater resources are obscured due to …