Common irrigation drivers of freshwater salinisation in river basins worldwide

Josefin Thorslund (), Marc F. P. Bierkens, Gualbert H. P. Oude Essink, Edwin H. Sutanudjaja and Michelle T. H. Vliet
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Josefin Thorslund: Stockholm University
Marc F. P. Bierkens: Utrecht University
Gualbert H. P. Oude Essink: Utrecht University
Edwin H. Sutanudjaja: Utrecht University
Michelle T. H. Vliet: Utrecht University

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Freshwater salinisation is a growing problem, yet cross-regional assessments of freshwater salinity status and the impact of agricultural and other sectoral uses are lacking. Here, we assess inland freshwater salinity patterns and evaluate its interactions with irrigation water use, across seven regional river basins (401 river sub-basins) around the world, using long-term (1980–2010) salinity observations. While a limited number of sub-basins show persistent salinity problems, many sub-basins temporarily exceeded safe irrigation water-use thresholds and 57% experience increasing salinisation trends. We further investigate the role of agricultural activities as drivers of salinisation and find common contributions of irrigation-specific activities (irrigation water withdrawals, return flows and irrigated area) in sub-basins of high salinity levels and increasing salinisation trends, compared to regions without salinity issues. Our results stress the need for considering these irrigation-specific drivers when developing management strategies and as a key human component in water quality modelling and assessment.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24281-8

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DOI: 10.1038/s41467-021-24281-8

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