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stream reverses, thus altering the time and duration of slack water. Variations in wind stress also directly affect the height of the tide, and the inverse relationship between the height of the tide and atmospheric pressure is well understood (1 cm change in sea level for each 1 mb change in pressure) while the duration of slack water at a given location is inversely related to the height of the tide at that location.
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may run for up to three hours after the water level has started to rise. Similarly, the flood may run for up to three hours after the water has started to fall. In 1884, Thornton Lecky illustrated the phenomenon with an inland basin of infinite size, connected to the sea by a narrow mouth. Since the
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In many locations, in addition to the tidal streams there is also a current causing the tidal stream in the one direction to be stronger than, and last for longer than the stream in the opposite direction six hours later. Variations in the strength of that current will also vary the time when the
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the semi-diurnal tide is virtually absent, resulting in the phenomenon known as a "dodge tide"—a day-long period of slack water—occurring twice a month; this effect is accentuated near the equinoxes when the diurnal component also vanishes, resulting in a period of 2–3 days of slack water.
181:, as the previously incoming tide brings clear water with it. Following low tide, visibility can be reduced as the ebb draws silt, mud, and other particulates with it. In areas with potentially dangerous tides and currents, it is standard practice for divers to plan a dive at slack times.
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For any vessel, a favourable flow will improve the vessel's speed over the bottom for a given speed in the water. Difficult channels are also more safely navigated during slack water, as any flow may set a vessel out of a channel into danger.
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level of the basin is always at mean sea level, the flood in the mouth starts at half tide, and its velocity is at its greatest at the time of high water, with the strongest ebb occurring conversely at low water.
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water when the water is completely unstressed, and there is no movement either way in the tidal stream. It occurs before the direction of the tidal stream reverses. Slack water can be estimated using a
177:, the absence of a flow means that less effort is required to swim and there is less likelihood of drifting away from a vessel or shore. Slack water following high tide can improve underwater
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Slack water is different from the 'stand of the tide', which is when tide levels 'stand' at a maximum or minimum (i.e., at that moment in time, not rising or falling).
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156:. The time of slack water, particularly in constricted waters, does not occur at high and low water, and in certain areas, such as
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Flood Rescue Boat
Operation - Australian Emergency Manual (Natural Disaster Organization), Chapter 12. Accessed 12 February 2020.
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Bye, J. A. T. (1976): Physical oceanography of Gulf St
Vincent and Investigator Strait. In:
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Shepherd, S.A., Bryars, S., Kirkegaard, I.R., Harbison, P. & Jennings, J. T. (Eds.):
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Australian
Government > Bureau of Meteorology > National Tidal Unit Glossary
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Australian
Government > Bureau of Meteorology > Dodge tide
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Some localities have unusual tidal characteristics, such as
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Bye, J.A.T. & Kämpf, J. (2008): Physical oceanography.
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Squire
Thornton Stratford Lecky; William Allingham (1918).
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60:. Unsourced material may be challenged and removed.
376:. Royal Society of South Australia Inc., Adelaide.
1371:North West Shelf Operational Oceanographic System
1361:Deep-ocean Assessment and Reporting of Tsunamis
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8:
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391:, pages 134-5. Accessed 3 September 2011.
355:, Tyler, M. J. & Webb, B. P. (Eds.),
120:Learn how and when to remove this message
286:, pp.141-142. Accessed 19 December 2013.
241:
692:one-dimensional Saint-Venant equations
357:Natural history of the Adelaide Region
254:, page 139. Accessed 3 September 2011.
19:"Slack water" redirects here. For the
359:. Royal Society of SA Inc., Adelaide.
263:Sport Diving, British Sub Aqua Club,
16:Short period in a body of tidal water
7:
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389:, Chapter 9:Tides and Tidal Currents
284:, Chapter 9:Tides and Tidal Currents
252:, Chapter 9:Tides and Tidal Currents
58:adding citations to reliable sources
1519:National Oceanographic Data Center
946:World Ocean Circulation Experiment
834:Global Ocean Data Analysis Project
374:Natural history of Gulf St Vincent
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1366:Global Sea Level Observing System
189:Combined tidal stream and current
139:is the short period in a body of
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387:The American Practical Navigator
299:Wrinkles in Practical Navigation
282:The American Practical Navigator
250:The American Practical Navigator
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1554:Ocean thermal energy conversion
1277:Vine–Matthews–Morley hypothesis
302:. G. Philip & son. p.
45:needs additional citations for
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1682:Underwater diving environment
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169:Implications for seafarers
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342:Accessed 13 March 2015.
330:Accessed 13 March 2015.
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65:Find sources:
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48:
43:This article
41:
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32:
31:
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23:episode, see
22:
1611:Water column
1559:Oceanography
1534:Observations
1529:Explorations
1499:Marginal sea
1492:
1450:OSTM/Jason-2
1282:Volcanic arc
1257:Slab suction
1003:
974:Head of tide
864:Loop Current
804:Ekman spiral
590:Stokes drift
500:Gravity wave
475:Cnoidal wave
386:
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373:
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323:
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175:scuba divers
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90:
83:
76:
69:"Slack tide"
64:
52:Please help
47:verification
44:
1601:Thermocline
1318:Mesopelagic
1291:Ocean zones
1262:Slab window
1127:Hydrography
1067:Abyssal fan
1034:Tidal range
1024:Tidal power
1019:Tidal force
904:Rip current
839:Gulf Stream
799:Ekman layer
789:Downwelling
764:Baroclinity
751:Circulation
647:Wave height
637:Wave action
620:megatsunami
600:Stokes wave
560:Rossby wave
525:Kelvin wave
505:Green's law
206:Dodge tides
146:tidal atlas
137:slack water
25:Slack Water
1671:Categories
1539:Reanalysis
1438:Satellites
1419:Sofar bomb
1267:Subduction
1242:Ridge push
1137:Ocean bank
1117:Contourite
1044:Tide gauge
1029:Tidal race
1014:Tidal bore
1004:Slack tide
969:Earth tide
889:Ocean gyre
709:Wind setup
704:Wind fetch
667:Wave setup
662:Wave radar
657:Wave power
555:Rogue wave
485:Dispersion
271:, page 167
236:References
216:neap tides
179:visibility
133:Slack tide
110:March 2011
80:newspapers
1401:Acoustics
1353:Sea level
1252:Slab pull
1189:tectonics
1097:Cold seep
1059:Landforms
936:Whirlpool
931:Upwelling
714:Wind wave
642:Wave base
570:Sea state
490:Edge wave
480:Cross sea
1634:Category
1586:Seawater
1313:Littoral
1308:Deep sea
1167:Seamount
1049:Tideline
994:Rip tide
924:shutdown
894:Overflow
627:Undertow
470:Clapotis
223:See also
1644:Commons
1514:Mooring
1464:Related
1455:Jason-3
1445:Jason-1
1328:Pelagic
1323:Oceanic
1298:Benthic
615:Tsunami
585:Soliton
148:or the
94:scholar
1333:Photic
1162:Seabed
575:Seiche
267:
160:, the
96:
89:
82:
75:
67:
1677:Tides
1524:Ocean
1493:Alvin
1343:Swash
1187:Plate
1132:Knoll
1122:Guyot
1077:Atoll
956:Tides
719:model
605:Swell
437:Waves
141:tidal
101:JSTOR
87:books
21:Awake
1491:DSV
1476:Argo
1338:Surf
794:Eddy
265:ISBN
173:For
73:news
370:In:
304:285
162:ebb
135:or
56:by
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421:e
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