Climate change is expected to have a devastating impact on the world’s coastal aquifers, with saltwater infiltration predicted to reach 77% of these underground freshwater supplies by the end of this century. According to a recent study published in Geophysical Research Letters, sea level rise and decreased groundwater recharge will cause saltwater intrusion into coastal watersheds around the world.
The study analyzed over 60,000 coastal watersheds globally and found that rising sea levels alone would drive saltwater inland in 82% of these areas by 2100. In contrast, slower groundwater recharge would cause saltwater intrusion in 45% of the studied watersheds. However, regions with increased groundwater recharge will experience a less significant impact.
The study’s authors note that lower rates of groundwater recharge are driving the extent of saltwater intrusion, while sea level rise determines its widespread presence globally. This means that management strategies will vary depending on the dominant factor in each region.
“The results highlight the importance of considering both climate change and local conditions when addressing these issues,” said Kyra Adams, lead author of the study. “This kind of approach can go a long way in supporting countries with limited resources.”
The study’s findings have significant implications for coastal communities and infrastructure, highlighting the need for globally consistent frameworks to address these challenges.
Source: https://phys.org/news/2024-12-saltwater-taint-coastal-aquifers-century.html