User’s stories

Compound flooding in Mozambique

An integrated flood modelling (compound flood with riverine and coastal influence) was developed for Mozambique based on global data with HydroMT. The Wflow and SFINCS models were coupled offline using HydroMT to align the rivers at different resolutions and coordinate reference systems, and to create automatic boundary conditions.

The models were run and the Cyclone Idai (March 2019) event was analysed and compared with UNOSAT flood extent data. ERA5 was used as precipitation input for both Wflow and SFINCS in order to provide discharge and GTSM waterlevels. Preliminary results of SFINCS flood depths (blue) are shown below.

Water quality diagnostic in Peru

Deltares BlueEarth new approach on model setup, from global to local, was applied recently in Peru for a nation-wide water quality diagnostic project. The wflow hydrologic and Delwaq water quality models were first prepared from global data and refined later using collected local data. For the water quality model alone, more than forty emission input data were prepared using a combination of global and local sources in various format using the HydroMT tool. These include global population and cattle grids, local mines and industry locations, regional statistics for GDP or treatment infrastructures etc. The Wflow model was forced using local meteorological grids (PISCO).

With this combination of local and global dataset, water quality hotspots for different substances and pressures could be assessed and compared to field observations (BOD, E. Coli, Nutrients, Metals from mining industry and chemicals).

National hydrologic models for Indonesia

HydroMT was used to prepare the updated national hydrologic models for Indonesia during phase III of the Joint Cooperation Program between the Netherlands and Indonesia. As this is a large scale domain, seven models corresponding to the different Indonesian regions (BaliNusaTenggara, Java, Kalimantan, Maluku, Papua, Sumatra, Sulawesi) were derived at three different resolutions and integrated to the IWRM Indonesia Instrument in Delft-FEWS (using a new export to FEWS function from HydroMT).

Global water quality modelling

Recently, Deltares has become involved in the United Nations Environment Program, which is organized as a consortium of relevant organizations to develop a World Water Quality Assessment (WWQA). Deltares is participating in this WWQA as an opportunity to contribute to mitigating the world-wide water quality crisis, as well as a good way to promote our knowledge, skills, and software. Our role consists of providing a global assessment of the concentrations of contaminants, as well as the impact these substances have on ecology and/or human health. Applying the models at this scale (whole of Africa) on a 1x1 km2 resolution also provided us with valuable insight in the capabilities and challenges of setting up models at this scale.