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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Start DD Boundaries error

KH
Krisma Hutanti, modified 2 Years ago.

Start DD Boundaries error

Youngling Posts: 1 Join Date: 8/29/17 Recent Posts
Hi, I try to run my DDB with start DD in Delft3d Flow, in this case I use more than 2 domain grid. I include a pict (pict number 1). But after I run my DDB the error script is show up. Like this one:
FINISHED Delft3D-FLOW
runid : flow120
date, time : 2018-04-10, 15:00:40
*** WARNING Smoothing time is 100.0% of simulation time
*** WARNING Comm. stop time outside (>) simulation period; will be reset
*** WARNING Minimum layer thickness (0.1*Dryflc) is too large for the vertical
*** WARNING Smoothing time is 100.0% of simulation time
*** WARNING Comm. stop time outside (>) simulation period; will be reset
*** WARNING Minimum layer thickness (0.1*Dryflc) is too large for the vertical
*** WARNING The following line in the ddb-file defines a 1 to even domaindecomp
*** osition boundary:
*** WARNING The file tri-rst.flow120.20170712.003000 for restart already exists
*** , written over
*** WARNING Smoothing time is 100.0% of simulation time
*** WARNING Comm. stop time outside (>) simulation period; will be reset
*** Too many errors and warnings to write to screen !!
0 errors and 13 warnings
returning to main program from domain flow120
------------------------------------------------------------------------------


------------------------------------------------------------------------------
FINISHED Delft3D-FLOW
runid : flow60
date, time : 2018-04-10, 15:00:40
*** ERROR Water level change too high > 25.00 m (per 0.5 DT) after 54 time
*** steps in the following points:
*** ERROR Flow exited abnormally
*** ERROR Water level change too high > 99.00 m (per 0.5 DT) after 4 times
*** teps in the following points:
*** ERROR Flow exited abnormally
*** WARNING Smoothing time is 100.0% of simulation time
*** WARNING Minimum layer thickness (0.1*Dryflc) is too large for the vertical
*** WARNING The following line in the ddb-file defines a 1 to even domaindecomp
*** osition boundary:
*** WARNING Velocity change too high > 5.00 m/s (per 0.5 DT) after 49 tim
*** esteps in the following points:
*** WARNING Velocity change too high > 5.00 m/s (per 0.5 DT) after 49 tim
*** esteps in the following points:
*** WARNING Velocity change too high > 5.00 m/s (per 0.5 DT) after 50 tim
*** esteps in the following points:
*** Too many errors and warnings to write to screen !!
4 errors and 61 warnings
returning to main program from domain flow60
------------------------------------------------------------------------------
D_Hydro [40.000462] <anonymous> >> d_hydro shutting down normally

The sript said it is FINISHED, but this processing doesn't produce trim and trih file. How to solve this problem? When the velocity and water level changes too high in start DDB.
Can anybody help me in this forum as I am still learning this software for my research. Thankyou
A`
Abigail `Holly, modified 1 Year ago.

RE: Start DD Boundaries error

Youngling Posts: 1 Join Date: 1/9/20 Recent Posts
Yes, it is possible to run with three domains. Whereas I haven't set up the simulation myself, I am using the results of a three-domain grid to run a Delwaq simulation. I've attached
an example of a .ddb file for three domains (coarse outer grid, intermediate in between and fine by the coast). Hope this helps. mybkexperience