TELEMAC-MASCARET Forum: Cancelling current refraction (1/1)

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TOPIC: Cancelling current refraction

Cancelling current refraction 5 years 11 months ago #32255

JBS OFFLINE Senior Boarder Posts: 78 Thank you received: 3	Hello, My question is simple: is there any easy way for deactivating wave refraction due to currents in the direct coupling of TOMAWAC with TELEMAC(2D) while keeping a tidal forcing thanks to a harmonic constituants file for water height variations? Thank you. JBS.
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Cancelling current refraction 5 years 11 months ago #32262

tfouquet OFFLINE Moderator Posts: 294 Thank you received: 112	Hello I think that if you don't want to take current into account, the easier way is to avoid coupling and just give the water level to tomawac from telemac through a file and then the radiation stress to telemac from tomawac through another file. Hope it helps T.
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Cancelling current refraction 5 years 11 months ago #32270

JBS
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Posts: 78
Thank you received: 3

Hello Thierry,

That is not very simple in my case, I am afraid.

I have noticed some significant enhancements of Hm0 when current-induced refraction was activated as opposed to zero-current situations (run as independent, stationary case), and it seems the latter is closer to reality than the former. So modelling refraction due to currents might induce some extra wave energy that is not physical.

Is current-induced refraction known to be sensitive in TOMAWAC and propagation models in general ?
Which parameters/options could be changed/activated in order to act on this phenomenon in the simulations?
[For instance, I have not activated wave blocking (DISSIPATION BY STRONG CURRENT) although I am not sure it is relevant here (Atlantic coast)]

Thank you again,
JBS.

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Cancelling current refraction 5 years 11 months ago #32271

tfouquet
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Posts: 294
Thank you received: 112

Hello

Dissipation by strong current has been set for a case in Manche where the current was generating too big heigth (during EPPEL Project if you know it), so it can be relevant for Atlantic coast if you have strong current. For example i see a paper of N. Guillou who use Westhuysen model near molene island ...

The solution i proposed (I didn't think of strong current yesterday) can be long because you need to simulate 2 telemac and one tomawac but i don't see why it would not be simple.

Hope it helps

T.

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Cancelling current refraction 5 years 11 months ago #32272

JBS
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Posts: 78
Thank you received: 3

Thank you for this information about strong currents.
The current here is not that large... but I can have a try.

In parallel, going back to my initial question, I would also test the following change in CORMAR.f subroutine in order to set current velocity to zero at each time step:

IF(PART.EQ.1) THEN
  CALL OV('X=C     ',UC, U_TEL%R, U_TEL%R, 0.D0, NPOIN2)
  CALL OV('X=C     ',VC, V_TEL%R, V_TEL%R, 0.D0, NPOIN2)
ENDIF

instead of:

IF(PART.EQ.1) THEN
  CALL OV('X=Y     ',UC, U_TEL%R, U_TEL%R, 0.D0, NPOIN2)
  CALL OV('X=Y     ',VC, V_TEL%R, V_TEL%R, 0.D0, NPOIN2)
ENDIF

Is this change correct and harmless for the rest of the TOMAWAC computations?
I think this would do the job while the sea level is still varying and should permit to emphasize the effect of currents on Hm0 by comparing with my previous results.

JBS.

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