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

cohesive and non-cohesive sediments file

RC
Rodrigo Carballo, modified 7 Years ago.

cohesive and non-cohesive sediments file

Youngling Posts: 19 Join Date: 5/27/11 Recent Posts
Hi,

We would be very grateful if somebody could help us running a flow and sediment transport model. In particular we have 2 questions:

1) We are trying to setup a file (SedDia) .d50 to run a model for non-cohesive sediments. We performed the file by using the quickin tool as a .dep file.
However the model does not run, an error occurs: "Error reading file at sediment NAME, key SedDia
Does the file need a different format from that obtained by means of the quickin tool? Although we export a .dep file with the values in the cell centres (as it is said in the manual),
there is one more data than the number of cells; we do not know the reason of this and if it may cause the error.

2) In addition, we have information related to cohesive sediments that we also would like to introduce in the model together with the non-cohesive sediments.
Within the estuary we are trying to model, there are some areas with cohesive sediments (that we suppose we have to delete from the previous file, but we are not sure) and to specify
them in a different file. Does this file need to have a specific format? We checked the whole manual but unfortunately we did not find information about that.

Thanks in advance

Best regards,
Qinghua Ye, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Rodrigo,

For your first question, in sed file, the keyword should be like:
SedDia = #sed1.d50# [m] Median sediment diameter (D50)

The sed1.d50 file is exactly an output (depth file format) from QUICKIN. No matter it is in cell center or normal depth point. But in the file, it will be read for cells, i.e. one grid cell has one d50 value. Notice:
1. GUI might not accept this line, but D_hydro binaries accept it.
2. spatial varing D50 can only be used with one sed fraction in the model. In another word, you cannot use this feature with one sand and one mud fraction.

For your 2nd question, you can specify a cohesive fraction and set:
IniSedThick = #a.dep#

where the area without mud, you can specify the thickness to be 0 m. This file is also an output (depth file format) from QUICKIN.

Regards,

Qinghua
RC
Rodrigo Carballo, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Youngling Posts: 19 Join Date: 5/27/11 Recent Posts
Dear Qinghua Ye,

We have done a lot of tests following your kind suggestions (together with others in the forum), but unfortunately the model does not work.
At this moment we are focused in trying to setup a model only with non-cohesive sediments. The problems seems to be that the model (GUI)
does not load the file *.sed. We do not really know if this is due to the file format, we have to use a different keyword...

We would be very grateful if you could check the files we are sending attached,

Yours faithfully
Qinghua Ye, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Dear Rodrigo,

I checked your file and it should work now.

I updated 2 small things:

1) you used the sed.sed two times in the mdf file.
2) include the enc file in the mdf file.

I strongly recommend you to join a Delft3D course if you can manage.

Regards,

Qinghua
Qinghua Ye, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Sorry, the files after I modified are attached.
RC
Rodrigo Carballo, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Youngling Posts: 19 Join Date: 5/27/11 Recent Posts
Dear Quingua Ye:

First of all, thank you for your time and help.

I think that we have a misunderstanding the other day when we uploaded the model. Our main problem is to upload the file .d50 in the model, in which the spacially median diameter of the sediment is defined. As stated in previous posts we have generated the file following the same procudere to create a bathimetry (.dep) and then we change the extension for .d50 (Noncohesivos.d50). Then, follow the manual in, the sediment file we input in the SedDia the name of the d50 file (Noncohesivos.d50) and the following error occurs:

"Error reading file at sediment sedimentAreas, key SedDia import rejected" . It is important to point out that SedimentAreas is the name we have given to the noncohesive sediment fraction.



In order to clarify our question the sediment file that we are trying to upload in the model reads:



Therefore, with this error uploading we cannot build the model (i.e. with spacilly varing sediment diameter), and we have to use a mean diameter size for the whole estuary.

Thank you for your time.
Qinghua Ye, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Rodrigo,

Oh, Sorry.

I attached a new sed file.

Where the line should be:

SedDia = #Noncohesivos.d50# [m] Median sediment diameter (D50)


Regards,

Qinghua

Attachments:

RC
Rodrigo Carballo, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Youngling Posts: 19 Join Date: 5/27/11 Recent Posts
Hi Quinghua:

The solution that you have proposed us has not worked and the same error is still occurring. I'm afraid that is something wrong with the file (.d50), but we have generated following the user manual and other posts in the forum. ie http://oss.deltares.nl/web/delft3d/cohesive-sediments-/-muddy-systems/-/message_boards/view_message/158227;jsessionid=3D52093529EDCD03290162604DE5FA92.

With the error at the time to import the sediment file in the model ie (Error reading file at sedimen, key SedDia Import rejected) we are not capable of saving the model with the spacially varing sediment diameter.

We send you a the d50 file if you want to chek it. We also send you a version of the model we are trying to build. As you will see the error related to the importation appears when you try to open the model.

Best regards
Qinghua Ye, modified 7 Years ago.

RE: cohesive and non-cohesive sediments file

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi, Rodrigo,

I was a bit confused. With the files you attached, I can run successfully without any change. Is it possible sth else possibly wrong? I was using the tagged version 6.01.01.2703.

Regards,

Qinghua
XZ
Xiaoya Zhang, modified 2 Months ago.

RE: cohesive and non-cohesive sediments file

Youngling Posts: 5 Join Date: 9/8/19 Recent Posts
Dear Qinghua,
I am making a Delft3D two-dimensional sediment model(non-cohesive sediments) to simulate the changes of riverbed scouring and silting in the flume test, 
but the result is very small and does not conform to the test result. Is Delft3D suitable for the channel in the simulation flume? And I don't understand why the 
sediment transport parameter setting at the boundary has no effect on the final result of erosion and deposition.

Any feedback would be very helpful.

Thanks in advance for your time and answer.

Zhang

Attachments:

KO
Kyssyanne Oliveira, modified 3 Years ago.

RE: cohesive and non-cohesive sediments file

Youngling Posts: 13 Join Date: 9/4/13 Recent Posts
Hi All,
I'm trying to model the resuspension of mixed (cohesive plus noncohesive) sediment in a continental shelf that has carbonate and terrigenous sediment. Basically, I have to vary spatially four classes of sediment: terrigenous mud, terrigenous sand, carbonate sand and carbonate gravel.

I saw that spatial varying D50 (SedDia file) can only be used with one sediment fraction in the model. So my doubt is how I can set all these sediments in my model. I also saw that the .sdb file would be used, but I'm a little confused on how to do this.

Yours faithfully,
Kyssyanne Samihra