intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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

 

 

Message Boards

How to make a Gate in Delft3d

MD
meddy danial, modified 2 Years ago.

How to make a Gate in Delft3d

Youngling Posts: 19 Join Date: 7/25/18 Recent Posts

 

Dear everyone

 

I need help to make a gate across the river using delft3d. My model consists of 4 layer (z-model) and I already put thin dam across the river using Adie Mode in Visualisation Area. When I add thin dam, after save the file (*.thd) the configuration is as follows:

48  342   37   342  V

 

However, when I read in the DELFT3D  manual, the configuration is different, for example like this:

V 5 3 7 3 4 4

 

In Manual, V is in the first column, But in *.thd file, V is located in the last column

 

My question :

a) which one is correct?

b) How to assign/determine each the layer, bottom layer open, and 1st-3th layer is close.

 

Sincerely yours

Meddy

GR
Gabriel Ruiz, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts

Hi Meddy,

 

I use Quickin to establish my gates. With thin dams, I "draw" the gates. Once that I have finished, I save my thin dams in a *.thd file. Using a Notepad++ (or Notepad, Emacs, Wordpad,  Gedit, etc...), I open my thin dams file and copy the initial and final indices of any thin dam that represents a gate. Once, I know the direction (U or V) and grid indices then, I establish the layer of the gate (I follow the rules that mention the FLOW manual about the *.gat files. Section B.3.1). Finally, I save the file as gates.gat. 

 

Of course, the way that you have done about the "draw" the gates is another option.

 

In your case, the .gat file would have a line as:

V 48 432 37 342 1 3

 

Regards

 

Gabriel

MD
meddy danial, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Youngling Posts: 19 Join Date: 7/25/18 Recent Posts

Dear Gabriel

 

Thank you. I already follow your instruction. I rename *.thd file to *.gat file. However, where or which window should I open the file *.gat? Because I cannot found the open file with the extension *.gat file. 

 

Note, when I use Quickin, I must click each line of grid to draw the gate across the river (please see the figure 1 in Quickin). Is it correct or do you usually do like that?

And when I complete all line of the grid, the result is as follows (*.thd).:

    49   342    49   342 V
    48   342    48   342 V
    47   342    47   342 V
    46   342    46   342 V
    45   342    45   342 V
    44   342    44   342 V
    43   342    43   342 V
    42   342    42   342 V
    41   342    41   342 V
    40   342    40   342 V
    39   342    39   342 V
    38   342    38   342 V
    37   342    37   342 V
    36   342    36   342 V

 

Sincerely yours

Meddy

GR
Gabriel Ruiz, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts

Hi Meddy,

 

my apologies because maybe, I was not clear with my little methodology to create the *.gat file.

You will not find in GUI-FLOW or Quickin a command or function to create the .gat files. The *.gat files should be created manually. It is a mistake to rename the thin dam file to .gat file. I use the thin dam file only to check the start and end points of my gate.

Using a plain text editor, you must created the *.gat file. For example, if you are using Windows as OS, you should open Notepad. On this new file, you will write the next line:

 

V 36 342 49 342 1 3

 

And save this file as *.gat, e.g. mygates.gat or gates.gat or river_gates.gat, etc...

As you see, every line of *.gat file represents a gate. The V is the direction of the gate, 36 342 are the grid indices where the gate starts, 49 342 are the grid indices where the gate ends and 1 3 are the layers of your gate.

It is not necessary to create the thin dam, you can use in Quickin -> View menu -> Grid -> Node Numbers. Write, identify or remember the grid indices where you want to start and finish the gate. With these grid indices in mind, you will create the *.gat file.

 

Check the Section B.3.1 of FLOW Manual.

 

Regards.

 

Gabriel

 

MD
meddy danial, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Youngling Posts: 19 Join Date: 7/25/18 Recent Posts

Dear Gabriel

You did not make any mistake at all. I understand your explanation.
Very clear. I succeed to make *.gat file either using Quickin or
visualization area.

But maybe you don’t get what I mean. Thus, after creating *.gat file,
I don’t know where should I add the *.gat file in Delft3d-Flow. For
example I know the location where I should put *.bct file, *.bcc,
.dep, *.grh,  etc in delft3d-flow. But I don’t know where is the
location to open file *.gat. in the Delft3d-Flow.

Thanks in advance
Meddy

GR
Gabriel Ruiz, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts

Hi Meddy,

 

you should use the keyword "Filgat" in the last line of your *.mdf file. Due to this keyword is not integrated in the GUI-Flow, you should add this keyword, editing your .mdf file, manually.

 

Regards.

 

Gabriel

MD
meddy danial, modified 2 Years ago.

RE: How to make a Gate in Delft3d

Youngling Posts: 19 Join Date: 7/25/18 Recent Posts

Dear Gabriel

 

Very nice. Now, I understand. It works. Thank you for your help.

However, I have one more question. I use Z-model (4 layers), Thus according to Delft3d-Flow Manual, the 1st layer start from the bottom layer (see the attached figure). In contrast, if we use the Sigma-layer model, 1st layer starts from surface water.

My question, should I change the configuration from V 48  342   37   342  1 3 , become  --> V 48  342   37   342  2 4 ?

What do you think about it? 

 

Thank you in advance

Meddy