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. 
 

** PLEASE TAG YOUR POST! **

 

 

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

 

 

Message Boards

Time Frame - Delft3D-Wave

TK
TAERIM KIM, modified 8 Years ago.

Time Frame - Delft3D-Wave

Youngling Posts: 2 Join Date: 4/24/11 Recent Posts
We are just going to run SWAN model in Delft3D but having problems with Time Frame.
We missed something but cannot find it yet.

We did

1) we are going to test Siu-Lam wave model case in the tutorials.

2) we just use uniform wind with same direction and speed.

3)We put the same numbers in Figure 6.14(Uniiform, 20 m/s, 255 deg)

4)We put same TIMES in Figure 6.7.

The problems are

1) Where we have to put Time when the wind starts.
Since wave development depends on the wind duration, it is important
to put the time when the wind starts.
But I don't know where I have to put wind start time.

2) The time in the Time frame is the time for output.
We changed the TIMES in the Time frame but the results are same all the
time even though three results are different.

3)Is there any other examples with input files for wave -wind only tests?

If any person who can give us some tips for the above problems, we will appreciate it.

Thank you for your time

KIM
Bert Jagers, modified 8 Years ago.

RE: Time Frame - Delft3D-Wave

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts
Hi Kim,

1) Where we have to put Time when the wind starts.
Since wave development depends on the wind duration, it is important
to put the time when the wind starts.
But I don't know where I have to put wind start time.


Traditionally the SWAN wave model that is used by Delft3D-WAVE runs in stationary mode (see user interface: "Output parameter" -> "Computational mode"). For a steady state simulation either the wind blows or it doesn't blow. It doesn't matter when it started blowing. This setting is used in most simulations; if you want to study in detail the wave field during and after the passage of a big storm then the time adaptation aspect should be taken into account and you should use the non-stationary option. Generally we run those simulations in combination with Delft3D-FLOW since the storm will affect the currents and water levels as well. See Section 4.5.10 Output parameters of the Delft3D-WAVE manual on these settings.

2) The time in the Time frame is the time for output.
We changed the TIMES in the Time frame but the results are same all the
time even though three results are different.


In a standalone stationary WAVE simulation with constant forcing of waves and wind, the results will always be the same (numerical iteration effects excluded). You may be interested in the wavecon.rid file as desribed in Section A.2.9 of the Delft3D-WAVE manual.

3)Is there any other examples with input files for wave -wind only tests?


I don't have any other freely available wave model input files available at this time.

Bert