Sonde stilling tube on Carrie Bow Cay dock.
Carrie Bow Cay
2007 Tidal Predictions

NEW - To determine high and low tides Download the Excel file of the 2007 tidal predictions.

Harmonic analysis is a method used to compute harmonic constituents from tidal measurements.  Harmonic constituents are most commonly used to generate tide tables and time series data and represent the response of the water to external forces such as the gravitational pull exerted by the moon or sun.  There are hundreds of known constituents available for harmonic analysis exercises with each assigned a frequency that represents the cycle of the exerted force.  Many of the harmonic constituents are used to represent the linear response to a particular frequency, while others represent compound responses resulting from nonlinear processes.  The harmonic analysis used to derive the predictions accounts for gravitational forces exerted by celestial bodies but not for contributions from weather (i.e., wind), currents, waves, local bathymetry and geography that also effect the water level.

Tidal predictions, presented below for January, February, March, April, May, June, July, August, September, October, November and December 2007 for Carrie Bow Cay, are generated by computing harmonic constituents (amplitudes and epochs) from the water surface elevation record acquired at Carrie Bow Cay.  The input data record used to compute the constituents covers the period from April 2003 through December 2004. A total of 48 constituents were computed by harmonic decomposition of the data record.  Computed constituents are used to generate the tidal predictions.  The constituents used in the analysis and their frequencies are given in the table below.

Surface elevation measurements, where available, are displayed on the charts with the tidal predictions.  Additional surface elevation measurements will be overlayed on the charts as it becomes available.   Future tidal predictions will be posted with the intent of improving the analysis.

Updated:  July 30, 2007.
 


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Constituent
Constituent frequency (cycles/day)
Z0 (Mean)
MSM
MM
MSF
MF
ALP1
2Q1
SIG1
Q1
RHO1
O1(Principal Diurnal Lunar)
TAU1
BET1
NO1
CHI1
P1 (Principal Diurnal Solar)
S1
K1
J1
SO1
OO1
ST1
ST2
ST3
O2
MU2
N2
NU2
OP2
H1
M2 (Principal Semidiurnal Lunar)
H2
ST5
ST6
L2
S2 (Principal Semidiurnal Solar)
ETA2
M3
N4
M4
MK4
S4
2SK5
M6
S6
M8
M10
M12
0.000000
0.001310
0.001512
0.002822
0.003050
0.034397
0.035706
0.035909
0.037219
0.037421
0.038731
0.038959
0.040040
0.040269
0.040471
0.041553
0.041667
0.041781
0.043293
0.044603
0.044831
0.074893
0.076405
0.077233
0.077461
0.077689
0.078999
0.079202
0.080283
0.080397
0.080511
0.080625
0.080967
0.081593
0.082024
0.083333
0.085074
0.120767
0.157999
0.161023
0.164073
0.166667
0.208447
0.241534
0.250000
0.322046
0.402557
0.483068