Amphidromic Points

Gone Fishin …

I was wondering about what causes tides a few days ago and just as a coincidence someone brought the subject up online.

Here's some factors though what causes it all is still a mystery.

Harmonic Constituents Name Definitions
M2 – Principal lunar semidiurnal constituent
S2 – Principal solar semidiurnal constituent
N2 – Larger lunar elliptic semidiurnal constituent
K1 – Lunar diurnal constituent
M4 – Shallow water overtides of principal lunar constituent
O1 – Lunar diurnal constituent
M6 – Shallow water overtides of principal lunar constituent
MK3 – Shallow water terdiurnal
S4 – Shallow water overtides of principal solar constituent
MN4 – Shallow water quarter diurnal constituent
NU2 – Larger lunar evectional constituent
S6 – Shallow water overtides of principal solar constituent
MU2 – Variational constituent
2N2 – Lunar elliptical semidiurnal second-order constituent
OO1 – Lunar diurnal
LAM2 – Smaller lunar evectional constituent
S1 – Solar diurnal constituent
M1 – Smaller lunar elliptic diurnal constituent
J1 – Smaller lunar elliptic diurnal constituent
MM – Lunar monthly constituent
SSA – Solar semiannual constituent
SA – Solar annual constituent
MSF – Lunisolar synodic fortnightly constituent
MF – Lunisolar fortnightly constituent
RHO – Larger lunar evectional diurnal constituent
Q1 – Larger lunar elliptic diurnal constituent
T2 – Larger solar elliptic constituent
R2 – Smaller solar elliptic constituent
2Q1 – Larger elliptic diurnal
P1 – Solar diurnal constituent
2SM2 – Shallow water semidiurnal constituent
M3 – Lunar terdiurnal constituent
L2 – Smaller lunar elliptic semidiurnal constituent
2MK3 – Shallow water terdiurnal constituent
K2 – Lunisolar semidiurnal constituent
M8 – Shallow water eighth diurnal constituent
MS4 – Shallow water quarter diurnal constituent

No, I don't understand what they mean.

It is the stuff for Hawaii. Just chosen from the site at random. The Bay of Fundy would be an interesting comparison.

http://en.wikipedia.org/wiki/Amphidromic_point
I hope they will forgive me for snafelling their picture.

And here are the constants for Bangor maine. (No idea how near that is to the bay of Fundy.)

Const# Name Amplitude Phase Speed
—— —- ——— —– ———–
1 M2 5.998 112.6 28.9841042
2 S2 0.863 150.7 30.0000000
3 N2 1.235 74.9 28.4397295
4 K1 0.482 206.6 15.0410686
5 M4 0.443 114.9 57.9682084
6 O1 0.372 190.4 13.9430356
7 M6 0.648 246.3 86.9523127
8 MK3 0.000 0.0 44.0251729
9 S4 0.026 100.7 60.0000000
10 MN4 0.000 0.0 57.4238337
11 NU2 0.240 79.9 28.5125831
12 S6 0.039 250.8 90.0000000
13 MU2 0.144 296.9 27.9682084
14 2N2 0.164 37.2 27.8953548
15 OO1 0.016 222.9 16.1391017
16 LAM2 0.042 130.3 29.4556253
17 S1 0.000 0.0 15.0000000
18 M1 0.027 198.6 14.4966939
19 J1 0.030 214.7 15.5854433
20 MM 0.000 0.0 0.5443747
21 SSA 0.000 0.0 0.0821373
22 SA 0.000 0.0 0.0410686
23 MSF 0.000 0.0 1.0158958
24 MF 0.000 0.0 1.0980331
25 RHO 0.014 183.4 13.4715145
26 Q1 0.072 182.3 13.3986609
27 T2 0.051 149.2 29.9589333
28 R2 0.007 152.3 30.0410667
29 2Q1 0.010 174.3 12.8542862
30 P1 0.159 205.4 14.9589314
31 2SM2 0.000 0.0 31.0158958
32 M3 0.000 0.0 43.4761563
33 L2 0.168 150.2 29.5284789
34 2MK3 0.000 0.0 42.9271398
35 K2 0.235 153.8 30.0821373
36 M8 0.089 303.5 115.9364166
37 MS4 0.000 0.0 58.9841042

I thought there'd be more.

Interesting how the amphidromioc points relate to the weather. Duelling for ascendancy with the largest range:
The southwestern corner of Ungava Bay, along with Bay of Fundy, has either the highest or second-highest tidal ranges in the world. Some sources estimate the spring tide range at the mouth of the Leaf River as being as high as 17 m (56 ft).

Ungava Bay is on the other side of the Newfoundland/labrador peninsula to the Bay of Fundy. And that desolate spot is a feature of the centre of the weather for North America, Britain and Norway:
http://my.opera.com/Weatherlawyer/blog/2009/10/12/666-a-mans-number

Tiz a zmarl wull dinnit?

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One thought on “Amphidromic Points

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