Measuring Ground Subsidence Rate in Bulacan and Pampanga Delta using Geodetic Techniques

This study examines coastal land subsidence in Douala, Cameroon, revealing rates between −17.6 and 3.8 mm yr^-1. Subsidence patterns correlate with natural and anthropogenic processes, including land-use changes and urbanisation. Recently urbanised areas show higher subsidence rates than older urban zones. The findings highlight the need for further investigation, ongoing monitoring, and adaptation measures to address this environmental challenge effectively.

Accurate elevation data is essential for flood risk assessment. We assess land elevation to local mean sea level of the Ayeyarwady Delta with a new, local DEM based on geodetic data and evaluate the performance of 10 global DEMs in an SLR impact assessment. Our study reveals major differences in performance between global DEMs and consequentially introduced uncertainty in SLR impact assessments, indicating potential similar uncertainties for other data-poor coastal lowlands around the world.