First maps of the fens of eastern England reveal saltwater that could threaten food production

First maps of the fens of eastern England reveal saltwater that could threaten food production
Credit: University of Lincoln

The first ever maps of the shallow groundwater of the Fens of eastern England show that salt water is relatively close beneath the surface, meaning that if sea-levels rise, then salt content would affect the ability of the area to grow food.

The eastern English Fens collectively produce 11% of the agri-food economy from just 4% of the agricultural land covering the entire country. With flooding being the UK's most serious natural hazard, low-lying marsh and such as the Fens are at high risk of soil salination.

This stratigraphic map of the shallow groundwater was collated by a team led by academics from the University of Lincoln, U.K. after taking electrical soundings to assess the depth at which lies beneath the land. The work revealed that even 6 miles from the coast, the depth of this salinity is only a few meters beneath the surface. The research is published in the Hydrogeology Journal.

Project leader and Deputy Head of Life and Environmental Sciences (Geography) at the University of Lincoln, Dr. Daniel Magnone said, "The work shows that the groundwater could be a pathway to salinization of these critical lands either via or over-abstraction of the water.

"Such an outcome would be hugely damaging to farming businesses in the area and our next task is to predict how will affect this and what level of water abstraction could be sustainably undertaken in the area."

Over-abstraction is when more water is pumped out of an area than is replenished via rainwater; it is important to establish a sustainable balance to avoid , which is a particular threat in .

David Webster from Edlington Consulting Group co-authored the research paper analyzing the maps and commented, "Edlington Consulting Group is delighted to have been involved in this innovative research and to use our expertise in ground investigation to inform this vital work on improving sustainability in agricultural water supplies.

"This project goes to the heart of our company's ethos, which is to work collaboratively with academic and commercial partners to find sustainable, natural and environmentally sensitive approaches to improving infrastructure and the built environment."

Previous work by the University of Lincoln demonstrated that salinization of agricultural lands in the area would cost up to £5,000 per hectare for every saline flood due to the drop off in yields of the high-value crops grown throughout the region.

The project maps the geology of the area by re-interpreting old cores, some of which date back to the 1880s. These new maps are part of a wider project and will help the team predict the effects of climate change across the area from which solutions to protect the valuable can be devised.

More information: Mitchell Moulds et al, Use of electrical resistivity tomography to reveal the shallow freshwater–saline interface in The Fens coastal groundwater, eastern England (UK), Hydrogeology Journal (2023). DOI: 10.1007/s10040-022-02586-2

Citation: First maps of the fens of eastern England reveal saltwater that could threaten food production (2023, January 31) retrieved 22 March 2023 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

The shapes of shrimp farms affect their groundwater pollution


Feedback to editors