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

Long-term morphological evolution (years)

JG
José González, modified 7 Years ago.

Long-term morphological evolution (years)

Youngling Posts: 2 Join Date: 9/11/12 Recent Posts
I'm starting to work with DELFT3D (FLOW-WAVE) and I need to study the long-term morphological evolution (5-10 years) of a coastline with a dam perpendicular to the land border (see figure 1)

I saw the webinar "Process-based Long Term Morphological Modelling" and want to know how to get to reach the results of the figure 2. Is the interpretation of similar results can be obtained with the tool "QuickPlot"?

I know that may represent areas of erosion / sedimentation with this tool, but I would like to represent my prediction coast morphological study after applying a constant wave conditions.

Is this possible with the combined model FLOW-WAVE? If anyone can help would be great, thanks to all

J Medina

Attachments:

GR
Gabriel Ruiz, modified 7 Years ago.

RE: Long-term morphological evolution (years)

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts
Hi Jose!

You need to use: WAVE + FLOW + MOR (in online simulation) in order to get morphological simulations.
If you want to do predictions about erosion/deposition sediment in your coast, you should use the MORFAC parameter.

How to use the MORFAC parameter and what this value is, you could find all the information in the Delft 3D FLOW, User Manual (Chapter 11, section 11.6), about how to use morphodynamic model, you can check the chapter 11 of FLOW User manual.

Nice plots!

Regards.

G.
Ben Williams, modified 7 Years ago.

RE: Long-term morphological evolution (years)

Jedi Knight Posts: 114 Join Date: 3/23/11 Recent Posts
Hi Jose,

You will also need to know what your morphological wave is. That is, a wave (or waves) that give you the same annual longshore transport and cross - shore transport, as the overall wave climate. Otherwise your Delft3D predictions will become rather unreliable. If your areas is significantly tidal then you may also have to schematize your morphological tide.

Good luck.

Ben
JG
José González, modified 7 Years ago.

RE: Long-term morphological evolution (years)

Youngling Posts: 2 Join Date: 9/11/12 Recent Posts
Thanks for your answers guys !

Ben, I understand that the information "morphological wave" I enter it as input in the WAVE model, right? Is it possible to introduce different cases as local wave information or I can only introduce a constant conditions of maritime climate? Example:

Persistence Time---Hsig----------Tp---------Dir
70%---------------------1m------------8s----------45 grades N
15%---------------------1.5m---------10s--------35 grades N
10%---------------------2m------------12s--------10 grades N
5%-----------------------2.5m---------14s--------40 grades N

Gabriel, I can define the conditions of morphological evolution of my project from the GUI - FLOW model or should I work on the files *.SED and *.MOR? I understand that sensivity MORFAC parameter is very high, are your minimum and maximum values can be between 1 and 100?

Thanks for your help !

JOSE
GR
Gabriel Ruiz, modified 7 Years ago.

RE: Long-term morphological evolution (years)

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts
Hi José!

Yeap! You should create the *.MOR and *.SED, because the MOR module takes all the parameters that it needs from these files.
About the MORFAC parameter, maybe you can check some documents that Ben Williams recommended in one of his previous messages. With these documents, I'm sure you understand better which MORFAC value you should use in your simulations.

Regards.

G
GL
Gabriel Lim, modified 10 Months ago.

RE: Long-term morphological evolution (years)

Padawan Posts: 37 Join Date: 5/5/18 Recent Posts
Hi Ben,

I just wanted to ask, how did you go about finding if the representative wave(s) produce the same annual longshore and cross-shore transport rates as the overall climate? I am new to Delft3D and am unsure if this can be done in the flow-wave module, or if it has to be done externally? I am studying a wave-dominant macro-tidal beach. Please advise! Thanks for your help and time.

Kind regards,

Gabriel