1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Tides vary from place-to-place in terms of: tidal range, or distance between high and low water levels, time interval between low and high water levels, and arrival time of high and low water levels. The factors that contribute to these changes include: configuration of the coastline, local depth of the water, ocean-floor topography ("bathymetry") and other hydrographic ("hydro" = "water" in Greek) and meteorological influences.

Many factors influence ocean tides. However, all coasts fall into one of three simple "tide types".
Diurnal-one high and one low tide per day; semidiurnal-two similar high tides and two similar low tides per day; and mixed -two high and two low tides per day BUT with successive high tide levels that are VERY DIFFERENT from each other
From Virtual Vacationland, http://www.bigelow.org