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

DELWAQ-PART:Assigning multiple fractions with different settling velocities

Ben Williams, modified 4 Years ago.

DELWAQ-PART:Assigning multiple fractions with different settling velocities

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

I have two questions about the particle tracking model in Delft3D (classical version).

1) One is able to specify multiple sediment fractions in the particle tracking module. Each fraction has a associated settling velocity. This is useful for tracking, for example, the movement of silt and mud fractions in dredge disposal operations.

However the particle tracking model seems to have a fundamental flaw: If one specifies multiple fractions with various settling velocities, it calculates the average and then assigns that single value to all particle fractions.

Is there a way around this flaw? At present I am simulating each fraction individually, which is laborious when combining together again afterwards.

2) There are a lot of extra files (such as the 'map' file) that are not needed to post-process the results. It seems to be an exact copy of the '.dat' file also produced. Thus doubling the amount of space taken up on the hard drive. Is there a way to suppress the generation of particular files?

3) Is the particle tracking model for Delft3D-FM going to be less brain-dead and more space efficient?

Best regards,

Ben
MJ
Michel Jeuken, modified 4 Years ago.

RE: DELWAQ-PART:Assigning multiple fractions with different settling veloci (Answer)

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts
1) Each particle can have only one settling speed, since it has only one z location. there is no other work around that the one that you mention. It would be nice to have a total concentration from PART directly.

2) It is on the wish list, but there is no scheduled date to implement it.

3) I hope so too

Michel