EGU21-13530
https://doi.org/10.5194/egusphere-egu21-13530
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

The impact of compaction of clastic sediments on fluvial-dominated delta morphology

A. Aulia Valencia1, J.E.A. (Joep) Storms1, Dirk-Jan Walstra2, Helena van der Vegt2, and H.R.A. (Bert) Jagers2
A. Aulia Valencia et al.
  • 1Delft University of Technology, Delft, Netherlands (a.a.valencia@tudelft.nl)
  • 2Deltares, Delft, Netherlands

Only a limited amount of data is available to quantify the impact of syn-depositional compaction on delta depositional patterns. In this study, we investigate numerically how different scenarios for compaction rate (0 - 10 mm yr-1) drives morphological variations in mud- and sand-rich fluvial-dominated deltas. To do this, a 1D grain-size dependent compaction model was implemented into the open-source Delft3D. This implementation allows deposited sediment to decrease in thickness over time due to the accumulation of newly deposited sediments above. The resultant sedimentary deposits of a prograding delta are post-processed to highlight the changes in depositional patterns under different compaction scenarios. Deposits are classified into sub-environment (e.g., delta top, delta front, and pro delta). The delta top geometry (e.g., area, shape, and rugosity) and the distribution of sediment between different sub-environments are compared. The modeling results verify that the larger compaction-induced subsidence affects accommodation provision. We show that this results in more significant sediment deposition and more evenly distributed sediment across the delta top. Larger compaction results in a smaller area with a more semi-circular shape and less rugose delta top. The modeling results presented here bridges the knowledge gap on the effects of syn-depositional compaction on delta morphology evolution.

How to cite: Valencia, A. A., Storms, J. E. A. (., Walstra, D.-J., van der Vegt, H., and Jagers, H. R. A. (.: The impact of compaction of clastic sediments on fluvial-dominated delta morphology, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-13530, https://doi.org/10.5194/egusphere-egu21-13530, 2021.

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