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


Message Boards

Heat exchange through DD boundaries

Fish Kun, modified 7 Years ago.

Heat exchange through DD boundaries

Hi everyone,

In my model there are two DD regions, which have different heat balance profiles due to the existence of vegetation shelter. The model is to check the thermal interactions between these two regions, so I want to know the amount of heat flow through the DD boundary.

However, I can only get the output of the heat fluxes (which is most likely to be in the vertical direction) for each region itself, by using the keyword #HeaOut#. So is there a way to output or calculate manually the heat flow(i.e. heat conduction and convection in water) across DD boundary?

I also wonder how Delft3D calculates the heat fluxes in water. I think the Delft3D-FLOW manual depicts the heat model for surface water, but it skips this part.

Thank you!

Anonymous Anonymous, modified 7 Years ago.

RE: Heat exchange through DD boundaries

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Fish Kun,

You can define monitoring cross-sections (section of the FLOW manual). Those will give you cumulative timeseries output of both advective and dispersive temperature fluxes in C*m3, which you can then convert to heat quantities. Such monitoring cross-sections cannot be defined on a DD boundary however, so you would have to place them just before your DD boundaries.

Fish Kun, modified 7 Years ago.

RE: Heat exchange through DD boundaries (Answer)

Hi Chris,

That is very helpful to me ! Thank you !