intro story Lake

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.

 

** PLEASE TAG YOUR POST! **

 

 

 

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


 

Message Boards

Bubble plume model not working

DG
Dougal Greer, modified 7 Years ago.

Bubble plume model not working

Youngling Posts: 4 Join Date: 10/28/11 Recent Posts
I posted with regard to this on the general forum but perhaps this is a better place for my query. I have spent some time trying to implement a bubble plume model in a lake but to date I have not managed to generate any currents from the plume. I have read and re-read the manual but can't see anything else to try.

I have created a very simple test case (attached to this post) which should be implementing a large bubble plume in a small grid, but the model output only shows currents in the range of 10^-13 m/s. If anyone has any experience with bubble plumes I would really appreciate it if they could have a look at the attached example. Presumably I have overlooked something very simple.

Many thanks,

Dougal.

Attachments:

Adri Mourits, modified 7 Years ago.

RE: Bubble plume model not working (Answer)

Yoda Posts: 1212 Join Date: 1/3/11 Recent Posts
Hi Dougal,

Your bubble plume works fine. See attached picture.

Bubbles are modelled as a sub grid process, causing inter changing of water from low layers to high layers. It's vertically mixed. It's not modelled as a vertical jet. Thus the (direct) influence on the velocities in the neighbouring points is very small. Especially since your model has a uniform density (uniform salinity and temperature). But if your model has non-uniform densities (non-uniform salinity and/or temperature), the effect of the bubbles will be bigger.

Regards,

Adri