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

DELFT3D WAVE Wind file on equidistant grid

JM
Joao Morim do Nascimento, modified 6 Years ago.

DELFT3D WAVE Wind file on equidistant grid

Youngling Posts: 13 Join Date: 3/8/13 Recent Posts
Hello everyone,

I would like to understand something that is confusing me. I have a curvilinear grid as my computational grid. In DEFT3D-WAVE manual they have:

'This data is often defined on a different grid than the computational grid used in Delft3D-WAVE. Translating these files into files defined on the (curvilinear) grid of the computational engine is often a lengthy process and can result in huge files. This special feature facilitates the reading of the meteorological data on its own grid and interpolates the data internally to the grid of Delft3D-WAVE'

However, at the end of the equidistant descriptions they have a section saying 'restrictions'. Well, one of the restriction is:

' The meteo grid must be of the same type as the computational grid, i.e. rectilinear with grid unit = [m] or spherical with grid unit = [degree]'.

Based on this, I do not understand whether it is possible to feed DELFT3D-WAVE a wind file on a equidistant grid when your computational grid is curvilinear.

I would like someone to help me...

Thank you very much!
Qinghua Ye, modified 6 Years ago.

RE: DELFT3D WAVE Wind file on equidistant grid

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
HI Joao,

The restriction means, you should use the same coordinate system for both grids, i.e., the meteorological grid and the computational grid. And the grids can be either curvilinear or equidistant grid. This doesn't matter.

Hope this help a bit?

Qinghua
AS
arun svv, modified 11 Months ago.

RE: DELFT3D WAVE Wind file on equidistant grid

Youngling Posts: 11 Join Date: 4/22/15 Recent Posts
Hi Qinghua,
How is it practically possible to maintain the same coordinate system for the meteorological grid and computational grid? Fo eg., In my case, my computational grid is in UTM and is confined to a small portion of India (UTM43 N), whereas winds are available from 30-120E and 0-30N latitudes. Can you please help how to proceed?
regards
Arun