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. 
 

** PLEASE TAG YOUR POST! **

 

 

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

 

 

Message Boards

How to define initial conditions of BLUE GREENS

SJ
Song JingWei, modified 7 Years ago.

How to define initial conditions of BLUE GREENS

Youngling Posts: 3 Join Date: 2/4/13 Recent Posts
Hello, everyone. I am using the WAQ module to simulate water quality of a lake in China. Recently, I have encountered a problem when I was taking the Blue Greens as a substance. The problem is that when defining input I have to fill the initial conditions of “BLUEGRN energy type (BLUEGRN_E;{ no unit})”,” BLUEGRN nitrogen type (BLUEGRN_N;{ no unit})”, “BLUEGRN phosphorus type (BLUEGRN_P;{ no unit})”. I looked up all the reference books but couldn’t find out how to assign these three initial conditions.
Does anyone know how to assign them? Many thanks!
AA
Anonymous Anonymous, modified 7 Years ago.

RE: How to define initial conditions of BLUE GREENS

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hello JingWei,

Those are just substances like any other.
You can define their initial conditions through the GUI or directly in the input file (*.inp).
If you do it in the input file, have look at Chapter 8 in this manual.

Hope this helps.
SJ
Song JingWei, modified 7 Years ago.

RE: How to define initial conditions of BLUE GREENS

Youngling Posts: 3 Join Date: 2/4/13 Recent Posts
Hello Thiange:
Thank you for your reply. I'm sorry I haven't expressed my problem clearly. I'm quite confused with the initial value of of these three substances. I refer to the D_WATER_QUALITY_USER_MANUAL, it explains the three values as 'netrogen limiting conditions', 'phosphorus limiting conditions', 'light limiting conditions'. But I just can't make out what these three mean for they are not the density or something that can be measured. Could you please give some example on them?
That's very helpful of you, many thanks!!
Song Jingwei. 2013.6.15
AA
Anonymous Anonymous, modified 7 Years ago.

RE: How to define initial conditions of BLUE GREENS (Answer)

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

The current manuals don't cover the BLOOM module in depth.
I would suggest you read one of those papers:
- Los, F., and J. Wijsman, 2007. Application of a validated primary production model (BLOOM) as a screening tool for marine, coastal and transitional waters. Journal of Marine Systems 64: 201-215
- Blauw, A., H. Los, M. Bokhorst, and P. Erftemeijer, 2009. GEM: a generic ecological model for estuaries and coastal waters. Hydrobiologia 618: 175-198

They give a nice explanation of how BLOOM actually works and what those variables stand for.

Good luck,
Christophe
SJ
Song JingWei, modified 7 Years ago.

RE: How to define initial conditions of BLUE GREENS

Youngling Posts: 3 Join Date: 2/4/13 Recent Posts
Hi Thiange:
Thank you very much, that's very helpful of you!!!
Best wishes!
Song Jingwei