Proceedings of the International Association of Hydrological Sciences (Apr 2020)

Determination of amount of land subsidence based on INSAR and LiDAR monitoring for a dike strengthening project

  • M. de Koning,
  • J. K. Haasnoot,
  • R. R. van Buuren,
  • M. Weijland,
  • C. Bisschop

DOI
https://doi.org/10.5194/piahs-382-57-2020
Journal volume & issue
Vol. 382
pp. 57 – 62

Abstract

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For the dike strengthening project Krachtige IJsseldijken Krimpenerwaard (KIJK) a study has been undertaken to optimize the amount of land subsidence. Based on archive information originally a subsidence rate of 11 mm yr−1 is used in the design calculations. This means that for a 50-year period an additional 0.55 m must be considered which does not comply with the macro-stability problems of the dike. Based on INSAR and LiDAR measurement data and reanalysing the archive data, the rate of subsidence is determined at an average of 8 mm yr−1. This could mean a reduction of 27 % on the amount of soil needed to balance subsidence.