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Timely study on rising groundwater offers hope for drought-stricken East Africa

ScienceDaily (October 19, 2022)

Titre : Timely study on rising groundwater offers hope for drought-stricken East Africa

ScienceDaily (October 19, 2022)

Résumé
New research indicates better groundwater supply management could hold the key to help combat the impact of climate change in East Africa, where countries are currently facing the worst drought and food insecurity in a generation.

Présentation
Drylands are regions characterised by low annual rainfall and high evaporative demand, as well as dry rivers and deep groundwater levels. If rain falling on the ground is light and drizzly it can evaporate quickly back into the atmosphere because it is held in the shallow parts of the soil. However, if it is intense and heavy it produces runoff in the dry riverbeds which can then infiltrate deep into the soil fast and escape evaporation back into the atmosphere.

This mechanism helps explain why, even with the drop in the ’long rain’ seasonal totals, the combination of high rainfall intensities in both seasons appeared to be contributing to the greater levels of below ground water storage.

The researchers went on to demonstrate the increasing water storage is not linked to any rise in soil moisture near the surface, confirming it represents banked water deep below ground and likely contributing to a growing regional groundwater aquifer in this region.

Story Source  : University of Bristol

Annonce (ScienceDaily)

Page publiée le 17 janvier 2023