V. Harezlak MSc (Valesca)

PhD Candidate

About Me


  • 2006 - 2008 Master Sustainable Development – Land Use, Environment and Biodiversity (Utrecht University)
  • 2003 - 2006 Bachelor Environmental Sciences (Utrecht University)
  • 2002 - 2003 Veterinary Sciences (University of Ghent)
  • 2001 - 2002 Propedeuse Biology (Utrecht University)
  • 2009 – present Researcher/Consultant Water Quality and Ecology (Deltares)
  • 2008 – 2009 Trainee Innovation Management (TransForum
  • 2007 Introduction Environmental Sciences (Utrecht University)
  • 2009 - 2014 Ecological Modelling with HABITAT (Deltares)
  • 2010 Emission Module (Deltares)
  • 2010 – 2011 SOBEK Water Quality (Deltares)



PhD candidate in the RiverCare Project on Floodplain Rehabilitation

In contrast to natural flowing rivers, the regulated rivers in the Netherlands allow vegetation in floodplains to mature to their climax succession stage. This climax stage is associated with high hydraulic roughness and little water storage capacity and can hence jeopardize water safety during high water discharges. To avoid such situations, all kind of measures are taken, like clearing floodplains trees, floodplain excavation, grazing, etc. However, the efficiency of those measures is not well understood and moreover, the other ecosystem services floodplains have to offer are often overlooked. This latter is a missed opportunity, as water safety can be combined with other ecosystem services, like biodiversity, carbon sequestration, water purification etc. Increasing knowledge on how to influence floodplain processes to guarantee water safety, while incorporating other ecosystem services, supports efficient floodplain management. Therefore, the aim of this research is to develop a process based, spatially explicit model that provides insight in important steering processes of floodplain vegetation development and what this vegetation development means in terms of multiple ecosystem services.


Harezlak, V., Augustijn, D. C. M., Leuven, R., & Geerling, G. (2018). Measuring and modelling plant traits in floodplains of regulated rivers. Abstract from 12th International Symposium on Ecohydraulics 2018, Tokyo, Japan.
Harezlak, V., Augustijn, D. C. M., Geerling, G. W., & Leuven, R. S. E. W. (2017). Unravelling processes steering vegetation development in Dutch floodplains: Combining fieldwork, theoretical trait frameworks and models. 28-28. Abstract from Netherlands Annual Ecology Meeting 2017, Lunteren, Netherlands.
Harezlak, V., Augustijn, D. C. M., Geerling, G. W., & Leuven, R. S. E. W. (2017). Plant traits as floodplain management aid?. 49-49. Abstract from 39th New Phytologist Symposium 2017, Exeter, United Kingdom.
Harezlak, V., & Augustijn, D. C. M. (2017). Seeking functional plant traits in 3 Dutch floodplains. 22-23. Abstract from NCR days 2017, Wageningen, Netherlands.
Harezlak, V. (2016). E1: Floodplain rehabilitation: linking processes to patterns. In RiverCare: Knowledge Dissemindation Days, October 31 – November 1, 2016 (pp. 19-20). (NCR Publication; No. 40). NCR.
Ji, U., Kang, J., Ryu, Y., Jung, S. H., Penning, W. E., Harezlak, V., ... Jang, C-L. (2016). Stream-scale experiments on vegetated flows: flow measurement and analysis. In G. Constantinescu, M. Garcia, & D. Hanes (Eds.), Proceedings of the international conference on fluvial hydraulics (River Flow 2016), St. Louis, USA, 11-14 July 2016 (pp. 521-526). Boca Raton: CRC Press - Taylor & Francis group.
Harezlak, V., Augustijn, D. C. M., Geerling, G. W., & Hulscher, S. J. M. H. (2015). Floodplain rehabilitation: linking processes to patterns. 117-119. Abstract from NCR-Days 2015, Nijmegen, Netherlands.
Other Contributions
  • 2008 Master thesis: Modelling Vegetation Shifts around Lake Tulane, Florida
  • 2006 Bachelor thesis: How Do Differences in Milk Production Approach affect N Concentration in the Soil?

UT Research Information System


  • 2013 Upscaling phosphorus fluxes in riparian wetlands: from data to knowledge rules – Mark Stoop (Radboud University/Deltares)
  • 2015 Modeling Water Quality of the Upper Citarum River, Java, Indonesia – Rigt Venema (University of Twente) (ongoing)

Contact Details

Visiting Address

University of Twente
Faculty of Engineering Technology
Horst Complex (building no. 20), room W200
De Horst 2
7522LW  Enschede
The Netherlands

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Mailing Address

University of Twente
Faculty of Engineering Technology
Horst Complex  W200
P.O. Box 217
7500 AE Enschede
The Netherlands