Tides

Tidal boundary condition

This is specified at each open boundary node on all segments that require this type of b.c. The elevations at those nodes are simply sum of all harmonics read in from bctides.in (see below).

Earth tidal potential

The tidal potential enters the momentum equation as a body force term:

Input

In SELFE, tidal b.c. (boundary condition) and earth tidal potential are specified in bctides.in

8 5. ntip !number of todal potential constituents, cut off depth (m). The latter is used to save a little computational time as tidal potential is negligible in shallow water. To include all depths in calculation, set a negative depth like -100.
M2 2 0.242339 1.405189e-04 1.03272 129.18 S2 2 0.113033 1.454441e-04 1.00000 0.00 N2 2 0.046398 1.378797e-04 1.03272 243.40 K2 2 0.030704 1.458423e-04 0.77955 310.55 K1 1 0.141565 7.292117e-05 0.90207 244.87 O1 1 0.100514 6.759775e-05 0.83992 247.06 P1 1 0.046834 7.251056e-05 1.00000 110.04 Q1 1 0.019256 6.495457e-05 0.83992 1.28 8 nbfr M2

1.405189e-04  1.03272     129.18

S2

1.454441e-04  1.0 0.00

N2

1.378797e-04  1.03272     243.40

K2

1.458423e-04  0.77955     310.55

K1

7.292117e-05  0.90207     244.87

O1

6.759775e-05  0.83992     247.06

P1

7.251056e-05  1.00000     110.04

Q1

6.495457e-05  0.83992       1.28

2 nope 59 3 0 0 0 !Atlantic M2 0.808688 226.095786 0.785793 225.374081 0.731786 224.540114