SonTek RS5 User Manual (August 2020) 81
Figure 58. Extrapolation Configuration Dialog
Extrapolation choices follow Mueller (2013). Options for the top extrapolation method
are:
Constant - Assumes the velocity or discharge is constant from the average of the
top cells defined by the ‘Number of Cells’ parameter
Power Fit – uses a power law with the associated coefficient (default is 1/6, or
0.1667)
3-point Fit - Uses a linear least squares extrapolation through the uppermost
three depth cells to the water surface.
Extrapolation choices for the bottom extrapolation are:
Power Fit - uses a power law with the associated coefficient (default is 1/6, or
0.1667)
No Slip - fits a power curve with the chosen coefficient through zero at the bottom
and through depth cells in the lower chosen percentage (default 20%) of the flow
or the last valid depth cell, if no valid bins are in the bottom chosen percentage of
the water column
The user also has the option here to discard the chosen bottom percentage of profile
(default 10%) or number of cells before extrapolation is performed.
Summary of Contents for Sontek River Surveyor RS5
Page 1: ...RS5 USER MANUAL XA00125...
