Thesis defence A.P. Luijendijk: morphodynamics

04 December 2019 15:00 - Location: Aula, TU Delft - By: webredactie

Crossing Borders in Coastal Morphodynamic Modelling. Seamless Modelling of Sandy Interventions. Promotor 1: Prof.dr.ir. M.J.F. Stive (CiTG); Promotor 2: Prof.dr.ir. S.G.J. Aarninkhof (CiTG).

Sand is the second-most used natural resource behind water and will be under increasingly high demand in coming decades. One of the reasons for this is that, worldwide, sand is more and more applied to counteract beach erosion. This thesis presents new techniques in remote sensing and numerical modelling to better understand and predict the dynamics of our sandy beaches. To this end, it explores the crossing of three types of borders.

First, international borders are crossed in a global assessment of historic beach dynamics using satellite imagery since 1984. Analyses of more than 2 million satellite images worldwide reveal that about 70,000 km of sandy beaches are eroding. Second, the boundaries between model time scales - from storms to decadal times - are dissolved by means of a new morphodynamic acceleration technique.

Decadal predictions reveal a lifetime of the ZM beyond 40 years which is much longer than the expected lifetime of 20 years. Finally, the developed seamless modelling approach enables to cross the ever-changing boundary between water and land, where sand moves from the wet to the dry domain and vice versa. The results show that the seamlessly coupled model can efficiently and realistically resolve the interactions between the wet and dry beach morphodynamic evolution; both in magnitude and in spatial and interannual variations.

With this work, a first step is made in developing a coastal landscaping model to better forecast the future behavior of sandy beaches in a changing climate.

More information?

For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.