Executive board

Luitze Perk MSc

Luitze Perk is Director Coasts & Seas at WaterProof BV. Luitze is a coastal engineer who graduated from Delft University of Technology in the field of Coastal morphodynamics.

Luitze’s core technical experience includes hydrodynamic, water quality, and morphodynamic studies. During his career, he has been involved in setting-up, calibrating and validating numerical hydrodynamic and morphodynamic models for shallow coastal seas and estuaries all over the world. He worked on numerous coastal development projects where he determined the effects of interventions on, among others; hydrodynamics, morphodynamics, density currents, re-circulation, wave penetration and nautical aspects.

As a member and later head of the hydro- and morphodynamic modelling team at ARCADIS, he has gained extensive knowledge on the consequences of interventions in coastal regions and estuaries. Based on his expertise in modelling, Luitze now provides specific advice in the field of coasts as Advisor Coastal Projects. Besides, Mr. Perk has been involved in numerous port related projects, located all over the world, where he further developed his knowledge on nautical aspects. These projects and others have additionally shaped Luitze’s project management experience.



linkedin email

Roelant Snoek MSc

Roelant Snoek holds the position of Director Acoustics & Marine Services at WaterProof BV. He studied Biology at the University of Groningen and graduated as a marine biologist. In the last years, he specialized on underwater acoustics in relation to offshore activities such as seismic exploration, pile driving, dredging operations and cable routing. Roelant has been working on environmental impact assessments for offshore winds farms in the North Sea. He is part of the Dutch Working Group on Underwater Sound, which defined an assessment methodology related to acoustics for offshore pile driving, including propagation modelling and defining criteria for threshold levels for marine mammals. In the past years, he conducted several offshore underwater acoustic measurement campaigns related to offshore activities and ambient noise.

By managing and conducting various national and international measurement campaigns, Roelant acquired extensive experience in the most optimal measurement campaign setup and strategy. This includes efficient equipment setup, to ensure the highest quality measurements. Health and safety aspects during measurement execution formed a key expertise within his projects. BOSIET & OPITO/HUET certified.

WaterProof_Logo_RGBlinkedin email


Abdel Nnafie PhD

Abdel Nnafie holds the position of Specialist Coasts & Seas at Waterproof BV. After his study of Physical Oceanography at the Institute for Marine and Atmospheric Research (IMAU) at the Utrecht University, he continued his academic career at this institute, where he obtained his PhD degree in the field of “morphodynamics of coasts and estuaries” in 2014.

After his PhD, he spent three years working at Flanders Hydraulics in Antwerp (Belgium) on a project of the Flemish government that aims at increasing fundamental understanding of the morphology of the Scheldt Estuary by using an idealized modeling approach combined with historical field data. Since September 2017, he started working as an advisor at WaterProof, where he is mostly involved in the morphology of the coastal zone, with particular emphasis on studying the morphological evolution of sand waves. The latter study is a joint project between WaterProof BV. and the University of Utrecht, where he also works as a part-time postdoc researcher. This joint project aims at predicting growth and migration of sand waves following a probabilistic approach, thereby using both idealized models and field data.

During his career, Abdel published many of his results in scientific journals.



Joost Brinkkemper PhD

Joost holds the position of Specialist Coasts and Seas at WaterProof BV. He graduated in 2013 from the master Physical Geography at Utrecht University with a specialisation in coastal dynamics and fluvial systems. During his graduation research, he focused on wave non-linearity in the shallow coastal zone and during an internship at the LIPC coastal instate in Merida (Mexico) he worked on wave run-up at the local beaches. After his master, Joost continued his career at Utrecht University as a PhD candidate, studying sand transport in the surf zone. He obtained his PhD degree in March 2018. During his time at Utrecht University, he gained much experience in collecting and analysing field data and working with several numerical models.

At WaterProof BV., Joost is involved in a wide variety of subjects. He works on hydrodynamic and morphodynamic studies in the coastal zone, but he is also heavily involved in projects concerning underwater acoustics. As Joost has experience with both numerical models as with executing field measurements, he is also often involved in field campaigns. Therefore, Joost is at the moment often found at sea for collecting measurements of underwater acoustics, and those measurements are also analysed by himself after returning to shore.

During his career, Joost published many of his results in scientific journals.



Kimberley Koudstaal MSc

Kimberley Koudstaal holds the position of Junior Specialist Coasts & Sea at WaterProof BV. She studied Hydraulic Engineering at the Delft University of Technology, where she specialized in Coastal Engineering. During her master thesis at Deltares, she studied the roles of high and low frequency waves on wave run-up at an intermediate beach in South-Korea using XBeach. Apart from that, she spent two months in Chile as part of a multidisciplinary team to contribute to the development of a new road project in the town of San Pedro de la Paz. Here, she was mainly involved in studying how the different variants scored in the event of a tsunami.

At WaterProof BV., Kimberley mainly deals with numerical modeling and data analysis of hydrodynamics and morphodynamics in coastal zones. She is involved in the study for reinforcement of the Prins Hendrikdijk at Texel and the study that aims to decrease the silt sedimentation at the port of Noordpolderzijl.


linkedin email

Daan Wesselman MSc

Daan holds the position of Specialist Coasts and Seas at WaterProof BV. He graduated in 2014 from the master Physical Geography at Utrecht University. During his graduation research, he focused on the behaviour of spectra and bispectra in the surf zone, based on measurements in a flume. During an internship at Deltares, he investigated by using the model Unibest-TC which hydrodynamic or morphological factors determine the long-term migration speed of sandbars in offshore direction. Daan continued his career at Utrecht University as a PhD candidate, where he analyzed how washover openings, gaps in the dunes, contribute to sand supply during storms at the location of the Wadden Islands, which makes them better protected against sea-level rise.

At WaterProof BV. Daan will be working on numerical modelling and executing/analysing field measurements.

During his career, Daan published many of his results in scientific journals.

linkedin email

Corinne Böhm MSc

In 2010, Corinne Böhm came to the Netherlands to conduct her Bachelor study of Marine and Coastal Management. Due to her love for the ocean and coast, she focused on integrated and holistic approaches to tackle coastal projects. For the bachelor thesis she than analyzed the feasibility of a wide green dike in the Eems-Dollard by comparing Dutch and German legislation and policy of the Natura2000 area.

Subsequently, she developed her interest further about so-called Building with Nature and bio-geomorphology within the Master of Marine Sciences at Utrecht University. Therefore, she conducted two research projects. For one project Corinne conducted five weeks of field studies at NIOZ within a large-scale project of Wetlands International and Deltares in the Demak region in Indonesia about the physiological response of the roots of the mangrove species Avicennia spp. to (rapid) sea-level rise. The other project was realized as Master thesis research in which she studied the effects of vegetated foredunes on wind and aeolian sand transport in Egmond aan Zee in the Netherlands.

Due to her interest in travelling and surfing, Corinne gained lots of international experiences, ranging from leading a water filter project in Mozambique to studying in Portugal. Her strength lays in applying scientific knowledge to socio-economic and environmental challenges, using an integrated approach.

At WaterProof Corinne works as Junior Specialist Coasts & Sea focusing on coastal related projects. Therefore, she conducts literature research, field studies as well as data analysis in order to support our model and consultancy projects.


linkedin email

Marijke Olivierse Ba

Marijke Olivierse holds the position of Project assistant Coasts & Sea at WaterProof BV. She studied Coastal Zone and Sea Management at Van Hall Larenstein in Leeuwarden. For her final thesis, she studied the effect of underwater acoustics resulting from simulated military active sonar on the behaviour of marine mammals in the Norwegian Lofoten area.

During the last several years, Marijke developed her project management skills.

At WaterProof BV., Marijke deals with a wide variety of supporting tasks. Her work both focusses on project support as well as assistance with business processes.


linkedin email

Janneke Krabbendam MSc

Janneke is a PhD candidate at WaterProof B.V. and the Institute for Marine and Atmospheric Research (IMAU, Utrecht University). She is supervised by Prof. Dr. Ir. Huib de Swart and Dr. Ir. Abdel Nnafie. Janneke studied Climate Physics at Utrecht University and did her final graduation research (with the same supervisors) also at WaterProof B.V. Her graduation research focused on modelling finite amplitude tidal sand waves using Delft3D. Among other things, this research focused on studying the influence of different environmental parameters on the characteristics of tidal sand waves and the recovery of sand waves after a disruption caused by e.g dredging.

The PhD project is a logical continuation of her graduation research and focuses on developing new, process-based knowledge and methods that will strongly improve assessments of burial depths of cables and pipelines in areas of the North Sea where active tidal sand waves occur. This PhD project is part of the Industrial Doctorates program of NWO (Netherlands Organisation for Scientific Research), in which PhD candidates carry out their research at both a university and a participating company.




Our partners

Besides our own staff, we also closely cooperate with our partners.

prof. dr. Leo van Rijn

Prof. Dr. Leo van Rijn is an independent consultant since his retirement in 2011 from Delft Hydraulics/Deltares and the University of Utrecht and has over 40 years experience in basic hydraulics (river, tidal and coastal flows), sediment transport and morphology of rivers, estuaries and coasts. He has participated as a team member and as project manager in many hydraulic and morphological studies in the Netherlands and abroad, using both physical and mathematical models. Various mathematical models have been developed to compute the sedimentation of channels and basins. Another activity has been the development of instruments for measuring in-situ velocity and sediment transport in rivers, estuaries and coastal seas.

He has written five books about fluid mechanics, morphology and sediment transport:

- Principles of fluid flow and surface waves in rivers, estuaries, seas and oceans (1990,2011);  
- Principles of sediment transport in rivers, estuaries and coastal seas (1993, 2012);
- Principles of coastal morphology (1998);
- Principles of sedimentation and erosion engineering in rivers, estuaries, coastal seas (2005, 2012);
- Manual of sediment transport measurements (1986, 2007).


WaterProof_Logo_RGB email

dr. Gerbrant van Vledder

Gerbrant van Vledder (1957) is specialist consultant regarding numerical wave modelling, coastal engineering and oceanography. His work connects theory with practical applications. Gerbrant studied Civil Engineering at Delft University of Technology and obtained his Masters degree in 1983 on the subject of the statistics of wave groups in wind generated waves. He obtained his PhD in 1990, for which he studied methods of wave prediction, focusing on the role of non-linear four-wave interactions. From 1988 to 1996 he worked at WL|Delft Hydraulics (now part of Deltares) in the field of coastal engineering with a focus on the development and application of numerical wave models.

From 1996-2011 he worked at Alkyon Hydraulic Consultancy & Research in the field of coastal engineering and wave modelling. From 2011 to 2013 he worked at BMT ARGOSS as a senior advisor on Oceanography and Wave Modelling. From 2007 till 2014 he was also part-time associate professor in the Section Environmental Fluid Mechanics, in the faculty of Civil Engineering and Geosciences of the Delft University of Technology (TU Delft). Since 2014 he is a visiting scientist in this group. He is also a member of the SWAN and SWASH development teams. In October 2013 he started as an independent advisor in the fields of wave modeling and hydraulic research.



homelinkedin email

Rinse de Swart MSc

Rinse de Swart worked during 2016 and 2017 as Junior Specialist Coasts & Sea at WaterProof BV. He studied Physical Geography at Utrecht University, where he specialized in coasts and estuaries.

At WaterProof BV., Rinse mainly worked with numerical modeling and data analysis of hydrodynamics and morphodynamics in coastal zones. He was involved in the burial depth study for the electrical cable between Borssele (near Vlissingen, Netherlands) and the Borssele wind farm and the salt marsh study at the island of Terschelling.

In addition, he continued the development of the wave measuring buoy and took a first step in reducing the knowledge gap regarding the effects of electromagnetic fields of high voltage cables at the bottom of the North Sea on the underwater life.

Currently Rinse is employed as a PhD student at the Coastal Morphodynamics research group of the Universitat Politècnica de Catalunya in Barcelona. The main research topic is how coastal morphodynamic patterns are affected by the interactions with processes at different spatio and temporal scales. From that position, Rinse / Universitat Politècnica de Catalunya advises us in our morphological projects.



Michel van Staveren

After graduating from technical college (electronics, electrical engineering and computer science), Michel van Staveren worked in the process industry, the semiconductor industry and as a RD&E software developer. He founded Jato Cleanroom Supplies in 2007. Due to his activities as a RD&E software developer, he has extensive experience in all aspects of innovative control systems, measurement sensors and their applications. Since 2015, he collaborates with WaterProof on the development of the prototype buoy JaT01. This prototype is a scalable platform with a wide choice in components. Depending on the application, different forms of sensors, energy supply (batteries, with or without solar panels) and various communication options (Lora, GPRS or satellite) can be chosen.


homelinkedin email