Analysis of groundwater drought using different indices

Europe has experienced several dry and hot summers in the 21st century; in 2018 northern Europe was hit by an extreme drought centred over Scandinavia and in 2022 large part of Europe suffered extreme hot and dry conditions. Unlike many other natural hazards, droughts may persist for long periods and this is particularly true for groundwater droughts, which are 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.

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Fig. 1 Simulated groundwater level for Norway using the HBV-model (5 August 2022). Colored circles are observed groundwater levels and the scale is relative to the same date in the reference period 1981-2010. Blue indicates higher than normal (wet conditions) and red is lower than normal (dry conditions).


Tags: Hydrology, Drought, Ekstremer, Groundwater
Published Sep. 7, 2022 9:38 AM - Last modified Sep. 7, 2022 10:45 AM

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