Abstract
Abstract. Land subsidence is a global problem, but a global land subsidence map is not available yet. Such map is crucial to raise global awareness of land subsidence, as land subsidence causes extensive damage (probably in the order of billions of dollars annually). With the global land subsidence map relative sea level rise predictions may be improved, contributing to global flood risk calculations. In this paper, we discuss the approach and progress we have made so far in making a global land subsidence map. Initial results will be presented and discussed, and we give an outlook on the work needed to derive a global land subsidence map.
Highlights
Its impact on flood risk is locally outranging the impact of absolute sea level rise, over the last decades land subsidence retrieved much less attention in terms of research
One of the reasons for this is the unknown extent of land subsidence around the world, in contrast to absolute sea level rise
A map showing the extent of land subsidence around the world, the global land subsidence map, would be very useful
Summary
Its impact on flood risk is locally outranging the impact of absolute sea level rise, over the last decades land subsidence retrieved much less attention in terms of research. The land subsidence rates could be used – together with regional absolute sea level rise predictions – to estimate relative sea level rise in coastal areas. This serves as input for flood risk calculations. Large cities or classic study sites in western countries show up most prominently Considering these limitations, we set out to produce a global land subsidence map that is derived from numerical model calculations. In this way, we are able to introduce a temporal component showing both historical and predicted future land subsidence under different development scenarios. Initial results will be presented and discussed, and we give an outlook on the work needed to derive a global land subsidence map
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