Ir. R.W.A. Siemes | People Pages: Find employees & contact details | University of Twente

Research on the development of rivers and coasts and their natural systems, and the various services these systems can provide. Hereby, my particular interest is improving our understanding of these systems, so that they can be applied for the benefit of both the natural system and humans.

I received my BSc and MSc at the University of Twente, focussing on water engineering and management. By doing my graduation assignment on “Modelling Consequences of Artificial Structures on Salt Marsh Dynamics in the Wadden Sea” at HKV, I graduated in 2019. After, I started my PhD at the University of Twente, where I am currently doing research on long-term, large-scale estuarine development subjected to nature-based solutions, for estuarine salt intrusion. These nature-based solutions can be either in the estuarine channel (e.g. artificial sand waves) or at its sides (e.g. wetlands or oyster beds). To overcome the various timescales involved in this research, process-based numerical modeling tools will be developed and combined into an efficient framework.

A brief pitch and an article on my MSc thesis project are available below.

https://www.youtube.com/watch?v=HGFz2e8Nbfg&feature=youtu.be

https://www.mdpi.com/2077-1312/8/5/326

Expertise

Earth and Planetary Sciences
- Climate Change
- Model
- Climate Change Impact
- Sediment Budget
- Estuary
- Marshland
- Depth
- Sea Level Rise

Organisations

Publications

2025

Impact of restored intertidal area on salt intrusion in estuaries (2025)[Contribution to conference › Abstract] NCK days 2025. Bootsma, J., Borsje, B. W., Siemes, R. W. A., van der Wal, D. & Hulscher, S. J. M. H.https://www.nck-web.org/boa-2025/983-managed-realignment-salt-intrusion

2024

Modelling the Effect of Human Interventions and Climate Change Impacts on the Sediment Balance and Salt Intrusion in Engineered Estuaries (2024)[Thesis › PhD Thesis - Research UT, graduation UT]. University of Twente. Siemes, R. W. A.https://doi.org/10.3990/1.9789036562591Climate Change Can Intensify the Effects of Local Interventions: A Morphological Modeling Study of a Highly Engineered Estuary (2024)Journal of geophysical research: Earth surface, 129(7). Article e2023JF007595. Siemes, R. W. A., Duong, T. M., Borsje, B. W. & Hulscher, S. J. M. H.https://doi.org/10.1029/2023JF007595Idealized model setup of a highly engineered estuary using Delft3D-FM (2024)[Dataset Types › Dataset]. Zenodo. Siemes, R.https://doi.org/10.5281/zenodo.108543853D modelling of salt intrusion and sediment trapping in an engineered estuary affected by human interventions (2024)In 21st International conference on the physics of estuaries and coastal seas (PECS 2024): Book of abstracts (pp. 204-205). Physics of Estuaries and Coastal Seas (PECS). Siemes, R. W. A., Duong, T. M., Borsje, B. W. & Hulscher, S. J. M. H.https://pecs2024.sciencesconf.org/data/pages/PECS_2024_Book_of_abstracts.pdf

2023

Morphological Response of a Highly Engineered Estuary to Altering Channel Depth and Restoring Wetlands (2023)Journal of marine science and engineering, 11(11). Article 2150. Siemes, R. W. A., Duong, T. M., Willemsen, P. W. J. M., Borsje, B. W. & Hulscher, S. J. M. H.https://doi.org/10.3390/jmse11112150Estuarine-wide sediment dynamics under human interventions and climate change effects: an idealised model study (2023)In Proceedings of the 37th International Conference on Coastal Engineering, ICCE 2022 (Proceedings of the Coastal Engineering Conference). Coastal Engineering Research Council. Siemes, R., Duong, T. M., Willemsen, P., Borsje, B. & Hulscher, S.https://doi.org/10.9753/icce.v37.sediment.12Estuarine salt-intrusion affected by changing channel depth and intertidal width (2023)[Contribution to conference › Abstract] NCK-days 2023. Siemes, R. W. A., Duong, T. M., Borsje, B. W. & Hulscher, S. J. M. H.https://www.nck-web.org/boa-2023/650-estuarine-salt-intrusion-affected-by-changing-channel-depth-and-intertidal-width

2022

Idealised modelling of estuarine development affected by human interventions and climate change (2022)In 7th IAHR Europe Congress: Innovative water management in a changing climate: September 7-9, 2022, Athens, Greece: Abstract book (pp. 92-93). IAHR. Siemes, R. W. A., Duong, T. M., Willemsen, P., Borsje, B. & Hulscher, S.https://www.iahreuropecongress.org/PDF/IAHR2022_ABSTRACT_BOOK.pdfAssessing short-term estuarine development after large-scale interventions: An idealised model study (2022)[Contribution to conference › Abstract] NCK Days 2022. Siemes, R. W. A., Duong, T. M., Borsje, B. W., Hulscher, S. J. M. H. & Willemsen, P. W. J. M.https://www.nck-web.org/content/documents/2022/BookofAbstracts-NCKdays2022.pdf

Research profiles

Address

University of Twente

Horst Complex (building no. 20), room W216
De Horst 2
7522 LW Enschede
Netherlands

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