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DELWAQ

DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.

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D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


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Water level time series at open sea boundary

JK
Jonathan King, modified 4 Years ago.

Water level time series at open sea boundary

Youngling Posts: 16 Join Date: 9/8/15 Recent Posts
Hi,

I am trying to input a time series containing water levels along an open sea boundary into my model. The model ran successfully when set up using a simplified sea boundary time series defined in the GUI so I am happy the rest of the model is working.

At each cell along the sea boundary I have a month long time series of water levels obtained from a MIKE Global model. Because of the length of the boundary the tidal oscillations are not uniform and depend on location. In the GUI I have defined the boundary from [M1,N1] = [1,185] to [M2,N2] = [1,364] which covers 178 cells.

My questions are:
1) What is the correct format of the time series file
2) What is the reference point from which the water elevation is taken? In the original data format this is given from MSL

I have attached a sample .bct file in what I think is the correct format but cannot find any advice elsewhere in the forum or user manuals. The headers on the .bct file are shown below with some comments:

table-name 'Boundary Section : 1'
contents 'Uniform '
location 'C2C_RibbleModel '
time-function 'non-equidistant'
reference-time 20120801
time-unit 'minutes'
interpolation 'linear'
parameter 'time ' unit '[min]' ! First column, time (the original data format is in days from the model start time, I haven't yet changed it to minutes)
parameter 'water elevation (z) end ?' unit '[m]' ! Second column, position in sea boundary; [M1,N1] = [1,185]
parameter 'water elevation (z) end ?' unit '[m]' ! Second column, position in sea boundary; [M1,N1] = [1,186]
...
...
...
parameter 'water elevation (z) end ?' unit '[m]' ! Last column, position in sea boundary; [M2,N2] = [1,364]
records-in-table 178

! The following columns correspond to each parameter above
! Col1 - time Col 2 - Water Level at [1,185] Col 2 - Water Level at [1,186] ... Col 2 - Water Level at [1,364]
0.000 WL @ [1,185] @ 0.000 ... ... ...
0.021 WL @ [1,185] @ 0.021 ... ... ...
0.042 WL @ [1,185] @ 0.042 ... ... ...
...
...
...
... ! To last record in time series


Many thanks
Jon
JK
Jonathan King, modified 4 Years ago.

RE: Water level time series at open sea boundary

Youngling Posts: 16 Join Date: 9/8/15 Recent Posts
Hi All,

I've worked out the correct format of the time series input file and associated boundary definition file. I imagine others may have a similar problem and as I couldn't find any existing threads in the forum I have attached the .bnd and .bct files for future reference.

Jon
Dmitry Kushnir, modified 4 Years ago.

RE: Water level time series at open sea boundary

Jedi Knight Posts: 102 Join Date: 11/9/12 Recent Posts
Hi Jonathan,

The correct format of the bct-file can be obtained via using the GUI. A simple (blank) time-series boundary conditions file with needed initial dates could be generated and then edited by the text-editor. You can also have a look at the examples folder, I believe it should contain .bct and .bnd example files.

Regards,

Dmitry
Dmitry Kushnir, modified 4 Years ago.

RE: Water level time series at open sea boundary

Jedi Knight Posts: 102 Join Date: 11/9/12 Recent Posts
Regarding your second question - Water level error

Regards,

Dmitry
JT
Jack Teo, modified 4 Years ago.

RE: Water level time series at open sea boundary

Youngling Posts: 21 Join Date: 6/15/15 Recent Posts
Hi Jonathan,

I just started using Delft and can I ask you a very simple question about boundary in FLOW?

I am running a test simulation with my own generated .dep but the results do not show any effects from the boundary. However, when I tested with a uniform depth i see the effects from the boundary.

Do you face similar problem before when you setup your model? Do i have to define the boundary in RGFGRID or QUICKIN before I select them in FLOW?
I am sorry but I am a bit desperate and no one is replying my thread before.

Thanks a lot. emoticon




Jack
JT
Jack Teo, modified 4 Years ago.

RE: Water level time series at open sea boundary

Youngling Posts: 21 Join Date: 6/15/15 Recent Posts
I found what was wrong with my input. I was using negative values in Delft instead of positive. I was using another model before and it was the other way around. My bad.
JT
Jack Teo, modified 4 Years ago.

RE: Water level time series at open sea boundary

Youngling Posts: 21 Join Date: 6/15/15 Recent Posts
I found what was wrong with my input. I was using negative values in Delft instead of positive. I was using another model before and it was the other way around. My bad.
JK
Jonathan King, modified 4 Years ago.

RE: Water level time series at open sea boundary

Youngling Posts: 16 Join Date: 9/8/15 Recent Posts
Hi Jack,

Sorry for not replying, I haven't checked the forum in a while! Yes that's a problem I had as the other model I was using (EFDC) required bathymetry data in the -ve depth format. As you said all you need to do is reverse the bathymetry values