ir. R.W.A. Siemes (Rutger)

PhD Candidate

About Me

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.





Earth & Environmental Sciences
Sand Wave
Side Effect
Wadden Sea


Siemes, R. W. A. , Duong, T. M. , Willemsen, P. , Borsje, B. , & Hulscher, S. (2022). Idealised modelling of estuarine development affected by human interventions and climate change. In A. I. Stamou, & V. Tsihrintzis (Eds.), 7th IAHR Europe Congress: Innovative water management in a changing climate: September 7-9, 2022, Athens, Greece: Abstract book (pp. 92-93). IAHR. https://www.iahreuropecongress.org/PDF/IAHR2022_ABSTRACT_BOOK.pdf
Siemes, R. W. A. (2021). Assessing future development of estuarine salt marshes. 1-1. Abstract from ECSA '58, Hull, United Kingdom.
Siemes, R. W. A. , Borsje, B. W., Daggenvoorde, R. J. , & Hulscher, S. J. M. H. (2021). Kwelderbouwers hun tijd ver vooruit. Land + water, (5), 14-15.
Siemes, R. , Duong, T. M. , & Hulscher, S. (2020). Developing an efficient modelling framework to evaluate nature-based solutions to counteract estuarine salt intrusion. In J. M. Carrillo, E. Fenrich, D. Ferràs, & S. Wieprecht (Eds.), Proceedings of the 1st IAHR Young Professionals Congress, 17-18 November 2020 (pp. 106-107). IAHR.

UT Research Information System

Affiliated Study Programmes



Courses Academic Year  2022/2023

Contact Details

Visiting Address

University of Twente
Faculty of Engineering Technology
Horst Complex (building no. 20), room W202
De Horst 2
7522LW  Enschede
The Netherlands

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Mailing Address

University of Twente
Faculty of Engineering Technology
Horst Complex  W202
P.O. Box 217
7500 AE Enschede
The Netherlands