{"id":893,"date":"2023-09-10T08:15:45","date_gmt":"2023-09-10T00:15:45","guid":{"rendered":"https:\/\/people.utm.my\/kelvin\/?p=893"},"modified":"2023-09-13T05:17:25","modified_gmt":"2023-09-12T21:17:25","slug":"tides-and-water-levels","status":"publish","type":"post","link":"https:\/\/people.utm.my\/kelvin\/2023\/09\/10\/tides-and-water-levels\/","title":{"rendered":"Tides and Water Levels"},"content":{"rendered":"\n
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Tides\u00a0are the rise and fall of\u00a0sea levels\u00a0caused by\u00a0gravitational forces\u00a0exerted by the Moon and Sun, by Earth’s rotation\u00a0and by\u00a0centrifugal force\u00a0caused by Earth’s progression around the Earth-Moon\u00a0barycenter. <\/p>\n\n\n\n

Tidal range\u00a0is the difference in height between\u00a0high tide\u00a0and\u00a0low tide. Tidal range variation depends on time and location. It can vary based on the type of tide pattern at a location. Diurnal tides have one high tide and one low tide per day, while semidiurnal tides have two high tides and two low tides each day, roughly of equal height. Mixed tides are a combination of diurnal and semidiurnal patterns, resulting in unequal high and low tides.<\/p>\n\n\n\n

Larger tidal range occur during\u00a0spring tides\u00a0(spring range), when the gravitational forces of both the Moon and Sun are aligned (at\u00a0syzygy), reinforcing each other in the\u00a0same direction\u00a0(new moon) or in\u00a0opposite directions\u00a0(full moon). The largest annual tidal range can be expected around the time of the\u00a0equinox\u00a0if it coincides with a spring tide. Spring tides occur at the second and fourth (last) quarters of the\u00a0lunar phases.<\/p>\n\n\n\n

By contrast, during\u00a0neap tides, when the Moon and Sun’s gravitational force vectors act in\u00a0quadrature\u00a0(making a\u00a0right angle\u00a0to the\u00a0Earth’s orbit), the difference between high and low tides (neap range) is smallest. Neap tides occur at the first and third quarters of the lunar phases.<\/p>\n\n\n\n

A tide gauge is an instrument used to measure and record the changes in sea level over time, particularly the rise and fall of tides in oceans, seas, and other bodies of water. Tide gauges are crucial tools for monitoring tidal patterns, studying coastal processes, assessing sea level changes, and providing data for navigation, environmental research, and disaster management. In Malaysia, these tidal data observation and prediction for coastal areas are conducted by\u00a0Department of Survey and Mapping Malaysia (JUPEM) and National Hydrographic Centre (PHN).\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

Tides\u00a0are the rise and fall of\u00a0sea levels\u00a0caused by\u00a0gravitational forces\u00a0exerted by the Moon and Sun, by Earth’s rotation\u00a0and by\u00a0centrifugal force\u00a0caused by Earth’s progression around the Earth-Moon\u00a0barycenter. Tidal range\u00a0is the difference in height between\u00a0high tide\u00a0and\u00a0low tide. Tidal range variation depends on time … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":26088,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[19,3,123,121,51,122],"class_list":["post-893","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-hydrographicsurveying","tag-hydrography","tag-tidegauge","tag-tides","tag-tkkelvin","tag-waterlevels"],"_links":{"self":[{"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/posts\/893","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/users\/26088"}],"replies":[{"embeddable":true,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/comments?post=893"}],"version-history":[{"count":1,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/posts\/893\/revisions"}],"predecessor-version":[{"id":895,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/posts\/893\/revisions\/895"}],"wp:attachment":[{"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/media?parent=893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/categories?post=893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/people.utm.my\/kelvin\/wp-json\/wp\/v2\/tags?post=893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}