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

PPrLim - correction flux algae growth

IH
Ingrid Holzwarth, modified 5 Years ago.

PPrLim - correction flux algae growth

Youngling Posts: 10 Join Date: 10/24/12 Recent Posts
Hi,

first of all: a happy new year to everyone!

During the set-up of my substance file in the PLCT (WAQ, not ECO), I can choose between two options for "numerical maximum flux" in the process "uptake of nutrients by growth of algae". One is constant, the other one is PPrLim.
I'm not sure if I understand correctly which mathematical formulation is activated in case I choose PPrLim. Is it the formulation in chapter 4.4 for the primary production rates corrected for the availability of nutrients?
If so, is it reasonable to set it to a constant value?

Thanks a lot,
Ingrid
Jan van Beek, modified 5 Years ago.

RE: PPrLim - correction flux algae growth (Answer)

Youngling Posts: 7 Join Date: 4/2/13 Recent Posts
Hi Ingrid,

The process PPRLIM indeed restricts the primary production based on the availibility of the nutrients as described in chapter 4.4. The process should always be activated and you should not use a constant value here, otherwise you will not get the actual uptake.

(the reason that pprlim is a seperate proces is because the primary production of greens and diatoms are calculated seperately but the sum of the production should not exceed the availeble amount of nutrients)

happy new year to you too!
Jan
IH
Ingrid Holzwarth, modified 5 Years ago.

RE: PPrLim - correction flux algae growth

Youngling Posts: 10 Join Date: 10/24/12 Recent Posts
Hi Jan,

thank you for your answer. It perfectly answered my question.

Best regards,
Ingrid