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.

 

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


 

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modelling a flow-through lake in Delft3D

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Marcin Kawka, modified 9 Years ago.

modelling a flow-through lake in Delft3D

Hi all,
I want to model a not very big flow-through lake ( http://en.wikipedia.org/wiki/Zegrze_Reservoir ). Is Delft 3D suitable for this task? The lake area is about 33 km^2, max depth about 15 meters and flow about 200m^3/s.
If yes, can someone advice me a pre-processing tool for preparing the simulation? I tried Delft Dashboard, but it looks like a coastal-suitable one. I want also to use my own measurements for the bathymetry generation (xyz file). Formerly I 've used DHI MIKE21 and Telemac2D/3D.
Bert Jagers, modified 9 Years ago.

RE: modelling a flow-through lake in Delft3D (Answer)

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts
Hi Marcin,

Yes, you can model such a lake using Delft3D. Indeed Delft Dashboard was developed by one of our coastal colleagues and in the current form it's not so useful yet for inland water bodies like rivers and lakes. I would recommend to use the standard pre-processing tools RGFGRID for grid generation and QUICKIN for bathymetry. I assume that you're working on Windows; have you requested the setup that includes these tools (see step 5 on the download - source code page)? Telemac data files can be processed in the Delft3D post-processing tool QUICKPLOT; it also allows you to export some data sets to e.g. Delft3D sample files (note: you'll need to remove the meta data header lines before further use). If you used rectilinear or curvilinear version of MIKE21 then you can also open the data file in QUICKPLOT and you may save the grid as a Delft3D grid file and data as a depth file for a quick start. QUICKPLOT may fail if you used the MIKE21 flexible mesh option; I don't know that file format well enough.

Best regards,

Bert
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Marcin Kawka, modified 9 Years ago.

RE: modelling a flow-through lake in Delft3D

Hi Bert,
Thank you for your answer. I've just emailed a request for windows setup.
Kind regards.
Marcin
TL
Tola Lema, modified 8 Years ago.

RE: modelling a flow-through lake in Delft3D

Youngling Posts: 10 Join Date: 12/2/11 Recent Posts
Hi,
I am doing similar modeling like what you did. One question I have is how to prepare the bathymetry for inland lake, can I use actual depth file as a bathymetry or do I have to convert it to actual datum elevation (e.g. 500 m MSL). My depth files are, -10, -15, -20, etc for the water depth and +10, +20, +30 for the land topography for areas around the lake. Delft manual says depth file to be -ve and topography file to be +ve?
Waiting your reply.
Richard Measures, modified 8 Years ago.

RE: modelling a flow-through lake in Delft3D

Jedi Knight Posts: 178 Join Date: 3/23/11 Recent Posts
Hi Tola,

See my reply to a similar question on the coastal forum Bathymetry for inland lakes above MSL. You can either convert you depths to actual datum elevation or not, it doesn't matter. You do have to use the correct sign convention for bathymetry though (+ve downwards i.e. greater values = lower elevations).

Cheers,

Richard