## Wind Velocity Definition

MOHID Water forum. Questions and discussion around MOHID Water
paulo.chambel.maretec@taguspark.pt
Posts: 29
Joined: Thu Jan 01, 1970 00:00
Location: Taguspark
Contact:

### Wind Velocity Definition

Dear Nuno,

you have two ways of defining the wind velocity.

Option 1 - You can define the wind velocity using as input the wind velocity components X (m/s, west-east) and Y (m/s, south-north);

Option 2 - You can define the wind velocity using as input intensity (m/s) and direction (degrees, meteorological convention). In this case you have also to define the properties \"wind velocity X\" \"wind velocity Y\" and in each of this two properties you nedd to impose the following options
FILE_IN_TIME : NONE
REMAIN_CONSTANT : 0
In this case the model will use the wind intensity and the direction to compute the components X and Y of the wind;

Option 1 - EXAMPLE:

<beginproperty>
NAME : wind velocity X
UNITS : m/s
DESCRIPTION : calculated wind velocity X
FILE_IN_TIME : NONE
REMAIN_CONSTANT : 1
DEFAULTVALUE : 1.
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

<beginproperty>
NAME : wind velocity Y
UNITS : m/s
DESCRIPTION : calculated wind velocity Y
FILE_IN_TIME : NONE
REMAIN_CONSTANT : 1
DEFAULTVALUE : 0.
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

Option 2 - EXAMPLE:

<beginproperty>
NAME : wind modulos
UNITS : m/s
DESCRIPTION : meteoIST wind velocity
FILE_IN_TIME : NONE
DATA_COLUMN : 2
DEFAULTVALUE : 5
REMAIN_CONSTANT : 1
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

<beginproperty>
NAME : wind angle
UNITS : degrees
DESCRIPTION : meteoIST wind angle
FILE_IN_TIME : NONE
DATA_COLUMN : 3
DEFAULTVALUE : 315
REMAIN_CONSTANT : 1
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

<beginproperty>
NAME : wind velocity X
UNITS : m/s
DESCRIPTION : calculated wind velocity X
FILE_IN_TIME : NONE
REMAIN_CONSTANT : 0
DEFAULTVALUE : 0.
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

<beginproperty>
NAME : wind velocity Y
UNITS : m/s
DESCRIPTION : calculated wind velocity Y
FILE_IN_TIME : NONE
REMAIN_CONSTANT : 0
DEFAULTVALUE : 0.
TIME_SERIE : 1
OUTPUT_HDF : 1
<endproperty>

luis_at_mohid.com
MOHID Developer
Posts: 553
Joined: Thu Jan 01, 1970 00:00
Location: Instituto Superior Técnico - Technical University of Lisbon
Contact:
Hi!

Wind direction must be given like this

0º = from North
90º = from East
270º = from West
180º = from South

wind velocities are computed like this:

WindVelocityX= WindModulus* cos(WindDirection * PI / 180.)
WindVelocityY= WindModulus* sin(WindDirection * PI / 180.)

Best regards,
Luis

luis_at_mohid.com
MOHID Developer
Posts: 553
Joined: Thu Jan 01, 1970 00:00
Location: Instituto Superior Técnico - Technical University of Lisbon
Contact:
Hi,

Yes.

Best regards,
Luis