">潮汐現象
海水面上升的現象稱為漲潮(flood)；
海水面下降稱為退潮或落潮(ebb)。
(1)海水上升的過程為漲潮，漲到最高水位時稱為滿潮。
(2)海水下降的過程為退潮，退到最低水位時稱為乾潮。
(3)滿潮與乾潮兩者的水位差，稱為潮差。
(4)滿潮時被海水淹沒，乾潮時露出水面的大片沙灘稱為潮間帶。
(5)滿潮→乾潮→滿潮或乾潮→滿潮→乾潮，所需時間稱為潮汐週期，平均為十二小時二十五分。受到地球自轉和月球公轉的影響，每天漲退潮時間，延遲約五十分鐘，而且因海底或海岸地形及位置不同，造成各地漲退潮的時間不一樣。
台灣沿海潮汐表
| 潮 型 | 農 曆 | 潮汐 | 淡水 | 基隆 | 福隆 | 宜蘭 | 花東 | 挑園 | 竹苗 | 彰中 | 嘉雲 | 澎湖 | |
| 大潮 | 1 | 16 | 乾潮 | 5:12 | 3:08 | 11:36 | 12:30 | 12:48 | 7:36 | 4:48 | 5:36 | 4:12 | 6:48 |
| 滿潮 | 1112 | 9:08 | 5:36 | 6:30 | 6:48 | 1:36 | 11:00 | 11:36 | 10:24 | 12:48 | |||
| 2 | 17 | 乾潮 | 6:0 | 3:56 | 12:24 | 1:18 | 1:36 | 8:24 | 5:36 | 6:24 | 5:00 | 7:36 | |
| 滿潮 | 12:00 | 9:56 | 6:24 | 7:18 | 7:36 | 2:24 | 11:48 | 12:24 | 11:12 | 1:36 | |||
| 3 | 18 | 乾潮 | 6:48 | 4:44 | 1:12 | 2:06 | 2:24 | 9:12 | 6:24 | 7:12 | 5:48 | 8:24 | |
| 滿潮 | 12:48 | 10:44 | 7:12 | 8:06 | 8:24 | 3:12 | 12:36 | 1:12 | 12:00 | 2:24 | |||
| 中潮 | 4 | 19 | 乾潮 | 7:36 | 5:32 | 2:00 | 2:54 | 3:12 | 10:48 | 7:12 | 8:00 | 6:36 | 9:12 |
| 滿潮 | 1:36 | 11:32 | 8:00 | 8:54 | 9:12 | 4:48 | 1:24 | 2:00 | 12:38 | 3:12 | |||
| 5 | 20 | 乾潮 | 8:24 | 6:20 | 2:48 | 3:42 | 4:00 | 11:36 | 8:00 | 8:48 | 7:24 | 10:10 | |
| 滿潮 | 2:24 | 12:20 | 8:48 | 8:42 | 10:00 | 5:36 | 2:12 | 2:48 | 1:36 | 4:00 | |||
| 6 | 21 | 乾潮 | 9:12 | 7:08 | 3:36 | 4:30 | 4:48 | 12:24 | 8:48 | 9:36 | 8:12 | 10:48 | |
| 滿潮 | 3:12 | 1:08 | 9:36 | 10:30 | 10:48 | 6:24 | 3:00 | 3:36 | 2:24 | 4:48 | |||
| 7 | 22 | 乾潮 | 10:00 | 7:56 | 4:24 | 5:18 | 5:36 | 1:12 | 9:36 | 10:24 | 9:00 | 11:36 | |
| 滿潮 | 4:00 | 1:56 | 10:24 | 11:18 | 11:36 | 7:12 | 3:48 | 4:24 | 3:12 | 5:36 | |||
| 小潮 | 8 | 23 | 乾潮 | 10:48 | 8:44 | 5:12 | 6:06 | 6:24 | 2:00 | 10:24 | 11:12 | 9:48 | 12:241 |
| 滿潮 | 4:48 | 2:44 | 11:12 | 12:06 | 12:24 | 8:00 | 4:36 | 5:12 | 4:00 | 6:24 | |||
| 9 | 24 | 乾潮 | 11:36 | 9:32 | 6:00 | 6:54 | 7:12 | 2:48 | 11:12 | 12:00 | 10:36 | 1:12 | |
| 滿潮 | 5:36 | 3:32 | 12:00 | 12:54 | 1:12 | 8:48 | 5:24 | 6:00 | 4:48 | 7:12 | |||
| 10 | 25 | 乾潮 | 12:24 | 10:20 | 6:48 | 7:42 | 8:00 | 3:36 | 12:00 | 12:48 | 11:24 | 2:00 | |
| 滿潮 | 6:24 | 4:20 | 12:48 | 1:42 | 2:00 | 7:36 | 6:12 | 6:48 | 5:36 | 8:00 | |||
| 11 | 26 | 乾潮 | 1:12 | 11:08 | 7:36 | 8:20 | 8:48 | 4:24 | 12:48 | 1:36 | 12:12 | 2:48 | |
| 滿潮 | 7:12 | 5:08 | 1:36 | 2:30 | 2:48 | 10:24 | 7:00 | 7:36 | 6:24 | 8:48 | |||
| 長潮 | 12 | 27 | 乾潮 | 2:00 | 11:56 | 8:24 | 9:18 | 9:36 | 5:12 | 12:48 | 1:36 | 12:12 | 2:48 |
| 滿潮 | 8:00 | 5:56 | 2:24 | 3:18 | 3:36 | 11:12 | 7:00 | 7:36 | 6:24 | 8:48 | |||
| 13 | 28 | 乾潮 | 1:12 | 11:08 | 7:36 | 8:20 | 8:48 | 4:24 | 12:48 | 1:36 | 5:36 | 2:48 | |
| 滿潮 | 7:12 | 5:08 | 1:36 | 2:30 | 2:48 | 10:24 | 7:00 | 7:36 | 12:12 | 8:48 | |||
| 14 | 29 | 乾潮 | 3:36 | 1:32 | 10:00 | 4:06 | 4:25 | 12:00 | 2:24 | 3:12 | 1:48 | 4:24 | |
| 滿潮 | 9:36 | 7:32 | 4:00 | 4:54 | 11:12 | 6:48 | 8:36 | 9:12 | 8:00 | 10:24 | |||
| 15 | 30 | 乾潮 | 4:24 | 2:20 | 10:48 | 11:45 | 12:00 | 7:36 | 4:00 | 4:48 | 3:24 | 6:00 | |
| 滿潮 | 10:24 | 8:20 | 4:48 | 5:42 | 6:00 | 1:36 | 10:12 | 10:48 | 9:36 | 12:00 | |||
以上潮汐表僅供參考，隨著季節改變，潮汐會略有不同
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