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- Movie:Sinking Deltas + (CU Science update featured a short movie o … CU Science update featured a short movie on 'Sinking Deltas'. </br>There is a widespread need to assess the vulnerability of the world’s population living in low-lying deltas to flooding, whether from intense rainfall, rivers or from hurricane-induced storm surges. High-resolution NASA SRTM topography data and MODIS satellite data along with georeferenced historical map analysis allows quantification of the extent of low-lying delta areas and the role of humans in contributing to their vulnerability. Thirty-three major deltas collectively include ~26,008 km2 of area below local mean sea level and ~96,000 km2 of vulnerable area below 2 m a.s.l. This vulnerable area may increase 50% under projected 21st Century eustatic sea level rise. Analysis of river sediment load data and of topographical changes show that these densely populated, intensively farmed landforms, that often host key economic structures, have been destabilized by human-induced accelerated sediment compaction due to water, oil and gas mining, and by reductions of incoming sediment from upstream dams and reservoirs and floodplain engineering.and reservoirs and floodplain engineering.)
