MHWN (Mean High Water Neaps)
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MHWN (Mean High Water Neaps) refers to the average height of the two highest waters, or high tides, that occur during the time of the month when the tidal range is smallest (neap tides). It represents the lower of the high-tide levels compared to spring tides, specifically averaging the high tides over a long-term period.
Key Aspects of MHWN:
Definition: The average high water level during neap tides (roughly every 14 days).
Neap Tide Occurrence: Occurs when the sun and moon are at right angles to each other, resulting in lower high tides and higher low tides.
Usage: Mariners use MHWN to determine vertical clearance under bridges or overhead cables during periods with lower high waters.
Distinction: It is distinct from MHWS (Mean High Water Springs), which is the average high tide during the highest tidal range.
It is often used alongside other tidal datums to provide a comprehensive understanding of tidal behavior in a specific area, ensuring safe navigation and operation for vessels, particularly in navigating shallow channels and avoiding grounding.
Key Aspects of MHWN:
Definition: The average high water level during neap tides (roughly every 14 days).
Neap Tide Occurrence: Occurs when the sun and moon are at right angles to each other, resulting in lower high tides and higher low tides.
Usage: Mariners use MHWN to determine vertical clearance under bridges or overhead cables during periods with lower high waters.
Distinction: It is distinct from MHWS (Mean High Water Springs), which is the average high tide during the highest tidal range.
It is often used alongside other tidal datums to provide a comprehensive understanding of tidal behavior in a specific area, ensuring safe navigation and operation for vessels, particularly in navigating shallow channels and avoiding grounding.