Saline wedge, or saline intrusion, occurs when seawater seeps into freshwater aquifers, leading to an increase in groundwater salinity. This process is often exacerbated by over-exploitation of aquifers, which reduces freshwater pressure and allows saltwater to penetrate more easily. Understanding the extent of this intrusion is vital if we are to take effective action.
In this article, we explore the causes, impacts and, above all, potential solutions for dealing with this crucial issue.
Understanding the salt-water intrusion phenomenon
In recent years, groundwater resources have experienced periods of significant imbalance. These situations have led to the introduction of more or less severe restrictions on use.
As far as groundwater is concerned, these situations are generally due to the natural recharge of water tables being insufficient to cope with withdrawals, which are tending to increase at the same time.
For coastal aquifers (Mediterranean, Atlantic or island), this recharge deficit is sometimes exacerbated by the presence of a risk associated with seawater intrusions (known as saltwater intrusion), the extent of which depends on the hydrogeological context at the coastline or nearby submarine edge (kilometre to deca-kilometre scale). In the context of climate change, the probable rise in sea level is an additional risk factor, favouring the progression of brackish water into these aquifers.
Importance and applications
An increase in groundwater salinity is not without consequences. It can make water unfit for human consumption and irrigation, affecting public health and agriculture. In addition, aquatic ecosystems and the species that depend on them can suffer from these changes in water composition. Identifying these impacts is the first step in mobilising the stakeholders concerned.
Solutions to combat the saltwater intrusion
Fortunately, it is possible to prevent and limit salt intrusion.
Actions such as sustainable management of water resources, artificial recharge of aquifers and the use of water-efficient irrigation techniques are effective measures. Raising awareness and educating local communities and industry players also play a crucial role in preventing this phenomenon.
SMD Intrusion by imaGeau
Principle
Preserving our freshwater resources from saline intrusion is a major environmental challenge, and that’s where imaGeau’s innovative technology comes in. With the SMD Intrusion solution, imaGeau offers a state-of-the-art monitoring system to combat this threatening phenomenon.
Thanks to SMD Intrusion, it is now possible to monitor the position and development of the salt wedge in real time. This revolutionary technology has already proved its worth at fifty-three sites in mainland France, French overseas departments and territories, and internationally. It enables water resource managers to monitor salt intrusionand adopt sustainable management of coastal aquifers.
How it works
SMD Intrusion assesses the vulnerability of coastal aquifers to saline intrusion. By monitoring their condition in real time, managers can control the phenomenon and preserve freshwater reserves. This assessment is made by measuring the resistivity of the medium, by injecting an electric current between two electrodes at different depths.
The high vertical resolution of the electrical methods used by imaGeau provides ultra-reliable data, essential for measuring the interface between fresh and salt water. This precise monitoring is backed up by a real-time alert system, enabling rapid reaction to changes and risks of saltwater intrusion.
imaGeau’s multi-level monitoring provides detailed and comprehensive surveillance of groundwater. This stratified approach makes it possible to understand the dynamics at different depths and take targeted action to protect coastal aquifers.
SMD Intrusion, monitoring the saltwater intrusion in Morocco
Challenges and prospects
Businesses and local authorities have a major role to play in combating saltwater intrusion. By adopting responsible practices and investing in sustainable water management projects, they can help mitigate the effects of this phenomenon. Their commitment is essential to ensure the sustainability of water resources and the health of ecosystems.
Saline intrusion is an environmental challenge that requires immediate and concerted action. By combining prevention, technology and collective commitment, it is possible to protect our freshwater resources. Together, let’s work towards a future in which our water tables remain pure and abundant, for us and for future generations.
The saltwater intrusion: what you need to remember
In conclusion, saltwater intrusion is a complex phenomenon that requires global awareness and local action. It is imperative that we recognise its importance and implement effective strategies to preserve our most precious asset: water. This article aims to inspire and motivate everyone to take action, because it is our collective responsibility to ensure the health of our planet and its natural resources.
imaGeau’s SMD Intrusion tool is a powerful solution for anticipating salt intrusion and taking the necessary steps to protect our precious freshwater resources. By adopting this advanced monitoring technology, businesses and communities can play an active role in preserving the environment and ensuring the sustainability of our water resources for future generations.
To find out how imaGeau can help you effectively manage your coastal water resources and to request a demonstration of SMD Intrusion, please contact us.
