Data
The tidal potential is defined by the number of constituents that should be included and each constituent is described by a number of parameters, as shown in Table 6.3, where the parameters for the M2 tidal constituent are shown as an example. The default is 11 constituents comprising M2, O1, S2, K2, N2, K1, P1, Q1, Mm, Mf and Ssa. There is no limit on the number of constituents that can be defined. The values for other constituents can be found in standard tidal books as for example (Pugh, 1987).
Table 6.3 Specification of the M2 tidal constituent
|
Name
|
M2
|
-
|
|
|
Species
|
2
|
-
|
Semi-diurnal, i0=2,
Diurnal, i0=1,
Seasonal, i0=0
|
|
Constituent
|
1
|
-
|
|
|
Amplitude
|
0.242334
|
m
|
|
|
Earthtide
|
0.693
|
-
|
Factor based on Love numbers
|
|
Period scaling
|
3600
|
|
Multiplies Period to obtain seconds
|
|
Period
|
12.42
|
|
Period of the constituent
|
|
Nodal no. 1
|
1.0
|
-
|
Nodal modulation factor
|
|
Nodal no. 2
|
-0.037
|
-
|
Nodal modulation factor
|
|
Nodal no. 3
|
-2.1
|
o
|
Nodal factor, angle
|
|
Argument 1
|
0
|
-
|
Doodson number, i1
|
|
Argument 2
|
0
|
-
|
Doodson number, i2
|
|
Argument 3
|
0
|
-
|
Doodson number, i3
|
|
Argument 4
|
0
|
-
|
Doodson number, i4
|
|
Argument 5
|
0
|
-
|
Doodson number, i5
|
|
Phase
|
0
|
o
|
Phase angle correction
|
