Deltas face multiple interacting hazards, many of which over the past decades have been intensified by local and regional anthropogenic developments  and most of which are expected to be exacerbated by climate change  . The most important hazards include SLR, inundation, salinity intrusion, cyclones, storms and erosion, many of which occur in combination. The potential for flooding and inundation depends on the relative sea level rise  which results from global and regional SLR as well as local subsidence within the deltas. Subsidence caused by natural and human drivers  is currently the most important cause for RSLR in many deltas and can exceed the rate of climate-induced SLR by an order of magnitude . But in higher warming scenarios the relative importance of climate-driven SLR is expected to increase over time . In a global study covering 47 major deltas and assessing future trends of sediment delivery across four RCPs, three SSPs  and a projection of future dam construction, Dunn et al.  find most deltas  will experience a mean decline of 38% in sediment flux by the end of the century when considering the average of the scenarios. Nienhuis et al.  find in a global assessment that some deltas have gained land through increased sediment load , but recent land gains are unlikely to be sustained if SLR continues to accelerate. According to the latest assessments, it is virtually certain that global mean sea level will continue to rise over the 21st century, with SLR by 2100 likely to reach 0.28-0.55 m in a an SSP1-1.9 and 0.63-1.01 m in an SSP5-8.5 scenario relative to 1995-2014 . The combined effects of local subsidence and GMSL rise result in a significant increase in the potential for inundation of low-lying deltas across all RCPs, with some variation according to regional sea level change rates, without significant further adaptation measures .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report