About Deltares

Deltares is an independent institute for applied research in the field of water, subsurface and infrastructure with five areas of expertise: Flood Risk, Sustainable Planning, Infrastructure, Water & subsoil resources and Environment. Throughout the world, Deltares works on smart solutions, innovations and applications for people, environment and society. The main focus is on deltas, coastal regions and river basins. Managing these densely populated and vulnerable areas is complex, which is why Deltares works closely with governments, businesses, other research institutes and universities at home and abroad. Deltares employs over 800 people and is based in Delft and Utrecht.


Rotterdamseweg 185,
2629HD Delft,
The Netherlands

Role in the SOLUTIONS project

  • Lead of Sub-Project Models

Main scientific contributions

  • Spatially and temporally explicit catchment modelling
  • Integration of modelling components
  • Uncertainty of modelling results

Member portraits

Jos van Gils

Jos van Gils is one of Deltares leading water quality model developers, with 30 years of experience in projects related to water quality and its management. He is co-ordinating all modeling work in SOLUTIONS to ascertain that it is consistent, integrated and fit-for-purpose. He will be guiding the use of Deltares’ open source water quality modeling software (
In 2005-2010 Jos van Gils lead the sub-project on exposure modeling and co-ordinated all modelling activities within the project MODELKEY (EU-FP6). In 2001-2004 Jos van Gils was responsible for all catchment-related and modelling-related research in the project daNUbs (EU-FP5), dealing with integrated management of nutrients within the Danube River Basin. Following this effort, he was invited as a co-author to the 2005 WFD “Roof Report” for the WFD implementation in the Danube River Basin.

Sibren Loos

Sibren Loos is about to complete his PhD on the subject of catchment modeling, including the modeling of particle fluxes towards surface waters due to erosion. Within SOLUTIONS he is expanding this work to the pan-European scale. Besides, Sibren Loos has considerable experience in the operation of complex water quality models in relation to their input and output data ( He brings this experience into SOLUTIONS, to facilitate the simulations for a wide range of emerging compounds in European River Basins.

Leonard Osté

Dr. Leonard Osté has a broad and gereral experience in the practical aspects of Dutch and European policy in the field of water and sediment quality. This includes the development of a Guidance Document for assessment of sediment quality within the WFD and a supporting modelling tool, as well as the derivation of ad hoc maximum permissible concentrations of toxic substances.
Leonard Osté co-ordinates the ‘From land parcel to sea’ programme of Deltares, which focuses on improving our understanding of how aquatic ecosystems function. This programme covers the entire spectrum of groundwater, through small surface waters to the sea (