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RE: Heat flux module

Trine Larsen, modified 11 Months ago.

Heat flux module

Youngling Posts: 3 Join Date: 6/8/18 Recent Posts

I am trying to run a Delft3D FM hydrodynamic model with the composite heat flux model. However, this is not working for me, I specify initial conditions, boundaries, and I have created a meteo file including air temperature (degree C), humidity (%), cloud cover (%), and Solar radiation (W/m2).

 

In shallow waters (or possibly only areas with flooding and drying, I have not been able to establish that), the temperature sky rockets, it increases from the initial 8 degrees to 50 degrees in just a few hours (the model covers Wales in the winter). Even if I do not include the solar radiation or set it to 0 W/m2, this happens. Has anyone experienced this, and is there a solution/what am I doing wrong?

Any hints would be appreciated

 

Update: It appears to be an issue with flooding/drying. It appears that the ocean model / composite temperature model does not recognise the same drying cut-off as the hydrodynamic model, and therefor keeps heating or cooling cells that the hydrodynamic model considers dry. These cells respond very quickly, and the excess heat "bleeds" in to the model domain. 

Is there a way of telling the composite temperature model to ignore cells with water level below a certain threshold?

d-flow fm heat flux temperature
Jing Zhao, modified 8 Months ago.

RE: Heat flux module

Padawan Posts: 29 Join Date: 7/12/16 Recent Posts

Dear Trine,

The solar radiation, doen't not only affect the water, but also the soil. The soil observes the solar radiation, warms up, and reflects partly this energy by means of diffusion to the water. 

 

We think this process affects both wet and dry cells. The soil of wet cells receive the solar radiation less than the dry cells, because of absorption of the radiation partly by the water. However, the dry cells are fully exposed to such radiation, and they may show a higher temperature than those of wet areas.

 

Kind regards,

Jing Zhao

Deltares

Agustín Ríos, modified 4 Months ago.

RE: Heat flux module

Youngling Posts: 1 Join Date: 7/6/16 Recent Posts

Hi Trine! 
I am having a similar problem as you. The ocean model keeps heating/cooling some cells that hydrodynamic model considers dry. Did you solve it?
Thank you in advance
Agustin