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. 




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



Message Boards

transects definition

Fernanda Achete, modified 7 Years ago.

transects definition


I am working with WAQ and the coupling with Dflow-FM (unstruc).
I' ve been trying to define transects in WAQ.

As Arjen Markus advise me I set in the .inp file

1 ; monitoring transects
1 ; Number of transects
'Transect 1' 8 253 56 100 57 145 56 203 ;eight exchanges and their indexes

So how do I define my exchange index?
My .poi file is [6 112715] (That is the Number of exchanges 1st direction : 112715), however when
I try to set it my waq the .lst file comes full of this

ERROR exchange in transect out of range.
raai number : 1
follow number : 70
exchamge number : 0

How do I define the transects position?
So how do I define my exchange index of a transect?
Another confusing point is that my DFlow gives me 141555 netlinks, that is where the cells comunicates and WAQ calculates 112715, why is that diferent?


Fernanda Achete
Leo Postma, modified 7 Years ago.

RE: transects definition (Answer)

Your .poi file consits of NOQ1 + NOQ2 + NOQ3 groups of 4 integers and is binary or unformatted with access=stream. You should make a small program to read the file and write it with 5I10 format. The first integer should be the interface number. Then comes the 'from' volume and the 'to' volume. The integers 3 and 4 are not meaningfull for Delft3DFM I suppose. Then make a list of the interface numbers that you want to contain in your transect and also make a note whether the 'from' volume number is at the one side or at the other side of the transect.
Then look in section 2.5 of the manual on the description of the input file. There you see how your input file should look like. You must devide your transect in 2 transect. One with the exchange numbers that have the 'from' volumes at the correct side of the interface and one with the exchange number that have them at the other side. The result is obtained by summing both contributions but with a minus sign for the second transect. Tedious, there is room for improvement, but it should work.
Good luck,