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Tidal Currents, Continued - 14221_197
Tidal Currents Introduction In  navigation,  the  effect  of  the  tidal  current  is  often  of  more  importance than  the  changing  depth  due  to  the  tide;  in  fact,  many  mariners  speak  of "the  tide"  when  they  actually  have  the  flow  of  the  tidal  current  in  mind. Currents  can  be  defined  as  the  horizontal  movement  of  water,  and  may be  classified  as  either  tidal  or  nontidal. Tidal  Currents.  These  currents  are  caused  by  gravitational  interactions between  the  Sun,  Moon,  and  Earth  just  like  the  vertical  rise  and  fall called  tide,  which  we  have  discussed.  Study  the  terms  associated  with tidal currents. Term Flood Current Ebb Current Slack Water Definition When  the  horizontal  movement  of  water  is toward  shore  or  up  a  tidal  river  or  estuary,  the current  is  said  to  be  flooding. When  the  horizontal  movement  of  water  is  away from  shore  or  down  a  tidal  river  or  estuary,  the current  is  said  to  be  ebbing. The  period  of  time  where  there  is  little  or  no current  is  called  the  minimum  before  flood  or ebb. Duration of   The  interval  of  time  in  which  a  tidal  current  is Flood flooding. Duration of   The  interval  in  which  the  current  is  ebbing.  In  a Ebb normal  semidiurnal  tidal  current,  the  duration  of flood  and  duration  of  ebb  will  each  be approximately  6  hours,  but  can  vary. Set The  direction  of  the  current  is  called  SET,  and  is expressed  in  the  direction  TOWARD  which  the current  flows. Speed  of The  velocity  of  the  current  is  called  speed  of Current  or current  and  is  sometimes  referred  to  as  drift. Drift 7-16

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