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

Water level due to typhoon

NB
Nophi Biton, modified 7 Years ago.

Water level due to typhoon

Padawan Posts: 38 Join Date: 8/1/13 Recent Posts
Hello everyone,

Does anybody here ec

I observed the water level from output simulations of D-Flow enforced with space varying wind and pressure (typhoon Ketsana). there seems a little variation in water level observed as opposed to observed in real situation (and also in JMA storm surge model). I still did not include the effects of tides and waves for this preliminary model.

Can anybody suggest or comment where I got wrong in my model? I believe there is something wrong with the way I defined the space varying wind and pressure.

Any help/discussion/explanation will be much appreciated.

The files needed are attached.

Regards
Nophi

Attachments:

EV
Evangelos Voukouvalas, modified 7 Years ago.

RE: Water level due to typhoon

Youngling Posts: 2 Join Date: 5/25/11 Recent Posts
Hi Nophi,

At the headers of your file you have described 3 quantities (wind speed, wind direction and pressure) each one defined in a 3x3 matrix, but at each group (the matrix below pdrop_spw_eye) you only describe the pressure field. Try adding 2 more matrices each one with 3x3 elements for the wind speed and the wind direction, before the pressure matrix.
NB
Nophi Biton, modified 7 Years ago.

RE: Water level due to typhoon

Padawan Posts: 38 Join Date: 8/1/13 Recent Posts
Hi Evangelous,

Thanks for your comment, so I need to add 2 more 3x3 matrices each for (windspeed, windirection), does the matrices follow in what order the quantities was defined such as windspeed, windfromdirection and then pressure? Also I used Holland model for getting the velocity profile at each needed node (in the spiderweb grid), and also for the pressure, now what I need to know is what model or basis that is currently used for getting the wind_from_direction since it's not given in the raw data I am using.(only one direction is given)

Also lastly, are you using the Delft3D WES (as there is a manual given for it upon installing Delft3D GUI) but I can't find it. and are you also modelling cyclone/typhoon induced surges? Can we work together thru email? (if you're not just that busy)

Thanks I am very grateful to you in taking time answering my question.


Thanks,
Nophi
NB
Nophi Biton, modified 7 Years ago.

RE: Water level due to typhoon

Padawan Posts: 38 Join Date: 8/1/13 Recent Posts
I added the two more missing matrices with trial data. then I run the simulation but there still seems to be a problem.

for typhoon modelling, water level rises at the center of the storm, another simulation model in JMA storm surge model was done, where the eye of the storm is clearly defined (in the animation) unlike in Delft3d model. I can not see the problem where, also the water level changes is very low as compared to JMA.

at least the eye of the storm must be clearly observed from the animation. please help, I can't see what other problem I've done.