In terms of salt-water intrusion and salinisation, global comparative studies are still lacking but the general processes are well understood , and research on individual deltas is on the rise. In the Mekong Delta of Vietnam, one of the main rice-producing deltas globally, salinity intrusion has been observed to extend around 15 km inland during the rainy season and around 50 km during the dry season , resulting in rice yield losses of up to 4 t ha-1 yr-1 . SLR, along with the expansion of dams and dry season irrigation upstream, is expected to further increase the salinity intrusion into the delta. This creates additional risk for food production as rice and other crops might be pushed beyond their adaptation limits in terms of salt tolerance, potentially affecting many of the 282,000 agriculture-based livelihoods in the Mekong Delta and increasing the pressure for cost-intensive adaptation . Genua-Olmedo et al.  find for the Ebro that in high scenario , SLR-induced salinity intrusion will lead to almost a doubling of salinity levels and a decrease of mean rice productivity by over 20% in a high-SLR scenario with almost 1 m of SLR by the end of the century.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report