Lesson 12 Tide Conditions

Keywords and Expressions

The lowest astronomical tide：最低天文大潮

The highest astronomical tide：最　高天文大潮

Mean still water level：平均静水面　

12.1　Water Depth

The water depth at any offshore location consists of a stationary component and a time-varying component. The variations are due to astronomical tide， to wind and the atmospheric pressure. Wind and variations in atmospheric pressure create storm surges， positive or negative. Other variations in water depth can be due to long-term climatic changes， sea floor subsidence or an episodic increase of water level events like tsunamis. Best estimates of water depth and its variations are derived from site-specific measurements with a tide gauge measuring pressure from sea floor. Accurate estimates of extrem ......     （共3426字）    [阅读本文]>>