Scatter Data Calculation

The Scatter Data Calculation defines how environmental conditions (wave, wind, and current) are extracted from Scatter Data and converted to conditions that can be used in SIMA analyses.

  • Scatter Data: Select the scatter data source to use.

  • Input Reference System: Defines the input reference system of the data. If the data is defined in the Metocean system the corresponding SIMA coordinate system data is generated

1. Wave

1.1. Directions

Specify the wave directions for which conditions should be calculated. Use the Populate from data action to automatically populate the directions from the selected scatter data sectors.

For omnidirectional scatter data, no directions are defined in the source data. You must manually specify the directions to calculate.

2. Wind

2.1. Wind Levels

Specify the vertical levels (Height above sea level (m)) at which wind data should be extracted.

Use the Populate from data action to automatically populate the levels from the wind data defined in the scatter data.

3. Current

  • Current Model: Select how current data is obtained

    • From input data - Use current data directly from the scatter data

    • From wind velocity - Derive current from wind velocity using empirical relationships

3.1. Calculation Levels

Column Description

Level

Depth below sea level (m)

Use the Populate from data action to automatically populate the levels from the current data defined in the scatter data.

3.2. Wind Driven Current

When using "From wind velocity" current model, additional parameters are available. See Hindcast Data for background on the wind-driven current model.

  • Wind Reference Level: The level in wind data at which wind speed and direction will be used to define the current (m)

  • Direction Relative to Wind: Direction relative to wind. Zero angle means collinear wind and current (deg)

  • K Factor: Scaling factor applied to the wind-driven current component

  • Wind Current Profile: Profile defining how the wind-driven current varies with depth. If not specified, a constant profile is used

  • Base Current Speed: Speed of the base current (m/s)

  • Base Current Profile: Profile defining how the base current varies with depth

4. Output Reference System

When using the Metocean input reference system, results are transformed to the SIMA coordinate system.

  • Relative Compass Angle: Relative angle between analysis x-axis and north direction in anti-clockwise direction. Should match the angle given in the receiving SIMA task location (deg)