Analysis of groundwater drought using different indices
Europe has experienced several dry and hot summers in the 21st century, and in 2018 northern Europe was hit by an extreme drought centered over Scandinavia. Unlike many other natural hazards, droughts may persist for long periods and this is particular true for groundwater droughts, which is the focus of this study.
Drought is caused by a combination or series of climate anomalies, which combined with low antecedent storage in surface and subsurface systems, may lead to a water deficit in streamflow and groundwater (hydrological drought). It is commonly characterized by a deviation from average conditions in different parts of the hydrological cycle, such as precipitation, soil moisture and streamflow.
In this study, we particularly want to analyse groundwater drought, including its development across the hydrological cycle. The focus will be on comparing different groundwater drought indices (e.g. the lowest groundwater level, or the time below a certain threshold) and their applicability across different hydro climatological regimes in Europe.
The work will be a contribution to the European Groundwater Drought Initiative (GDI), which also will provide data for the analysis.