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

Rain in DELWAQ

Fernando Aguilar, modified 7 Years ago.

Rain in DELWAQ

Youngling Posts: 22 Join Date: 2/7/13 Recent Posts
It is of increasing importance in aquatic systems modeling the direct atmospheric precipitation of water and nutrients (both in rain and dust) on some kind of inland water bodies, specially in lakes and reservoirs with large surface development, being the oligotrophic systems more sensitive. This is important for a correct water balance but also for the amount of nutrients available to algae in the upper layer of the water column.

So we would like to ask for the posibility of simulate these processes in Delft3D and DelftWAQ models. As I understood, in FLOW you can model it adding an .eva file (with precipitacion, evaporation and rain temperature parameters). In WAQ, I saw a option in discharges called "Waste load modelling rainfall". However, when I try to run the model using this feature I receive the following error:

ERROR. Reading block 6 !! Check input file !!

ERROR. Too many and/or invalid data in block 6 !! Check input file !!

I have tried to add a .tim file and also to put constant values, but it doesn't work...

Any tip?

Thank you,
Anonymous Anonymous, modified 7 Years ago.

RE: Rain in DELWAQ

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Fernando,

Are you working with the GUI or directly in the input file?
Could you share your *.inp file?

Regards, Christophe
Stephanie Zeunert, modified 5 Years ago.

RE: Rain in DELWAQ

Youngling Posts: 14 Join Date: 6/2/14 Recent Posts
Hi everyone,

Although this post is over a year old I would like to get some help with the integration of rain in DELWAQ. In FLOW I’ve included the precipitation by adding an .eva file. In DELWAQ so far I’ve chosen the option “Waste load modelling rainfall” in the Discharges field. At the moment I’m not sure if I need to specify the flow for this waste load directly or if it is taken from the hydrodynamic results.

Thanks for your help
Arjen Markus, modified 5 Years ago.

RE: Rain in DELWAQ

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
I do not think the rainfall intensity is transferred to DELWAQ in the same as is the flow rate of point sources. Actually, I am almost certain of that.

Therefore I'd say: provide the flow rate explicitly. (If it is passed in the same way, then the GUI would take care of it automatically).

I think I can guess your next question: the unit (m3/s accumulated for the whole model region or m3/s.m2 as an intensity). I vaguely remember it is the latter, as that seems to be the more logical one, but one thing to find out is by using the continuity.
Stephanie Zeunert, modified 5 Years ago.

RE: Rain in DELWAQ

Youngling Posts: 14 Join Date: 6/2/14 Recent Posts
Hi Arjen,

thanks for your quick response. I'll try it out.