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.






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D-Flow Flexible Mesh
Cohesive sediments & muddy systems


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Water loss through boundary

Johnny Coyle, modified 4 Years ago.

Water loss through boundary

Youngling Posts: 1 Join Date: 11/17/16 Recent Posts
Hi all

I am wondering if you can help I have built a model of a tidal harbor with inputs along west and the north east section of the model domain. During model calibration the model runs ok for the initial week then an instability develops where two Neumann boundaries meet. This then causes significant drop in water level at the model edge and other instabilities which spread to cover a large proportion of the domain. DA velocity shows water flow from Inflow boundaries exiting the domain through the Neumann boundaries close to this location. I am in the process of formal model calibration and running different permutations of roughness and this instability only appears for one of the permutations of bed roughness. Boundary conditions are identical.

Has anyone encountered this before? It is causing significant water loss from the domain and am wondering how best to resolve this as it is causing significant water loss from the model domain