intro story Lake


Lakes and reservoirs are important resources for communities around the globe. They provide food, drinking and irrigation water and can also offer spots for recreation. Under certain conditions lakes can also represent a threat for local communities, such as flooding or limnic eruptions. The ecological state of shallow lakes may be hampered by suspended sediments due to wind driven currents and waves. In deep lakes, stratification can cause undesirable anoxic conditions in the deeper areas. Understanding these systems is crucial to enable a sound management of these water bodies.

Delft3D is the state-of-the-art modelling framework for hydrodynamics, water quality, ecology, waves and morphology.
Here, in this space, we share knowledge & experiences, and discuss issues related to modelling of lakes.






Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems


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Steep slope from deep water to coastline

Hanieh Mohamadi Moghadam, modified 3 Years ago.

Steep slope from deep water to coastline

Youngling Posts: 4 Join Date: 8/20/17 Recent Posts
Dear Delft3D users,

I want to model hydro+wave with a slope of 27 percent from deep water to the coastline. I use Domain Decomposition technique with an 300mX500m rectangular domain and 2mx2m grid size as outside domain and an 98mX200m rectangular domain and 0.5x0.5m grid size as inside domain. With this spatial resolution, I tried different time step ranging from 0.2 min to 0.02min, however I keep receiving "Water level change too high" error. I assume there must be something wrong with the courrant number, but I don't know how to fix it.
I know the slope is very steep and I was wondering if anybody has similar problem.
The boundary con. is Water Level for the offshore side and Neumann for the lateral sides and nothing (open boundary) for the coastline.
I really appreciate if you give me your advice on how to fix this error.