Home > wafo > docs > perioddef.m

perioddef

PURPOSE ^

wave periods (lengths) definitions and nomenclature

SYNOPSIS ^

This is a script file.

DESCRIPTION ^

  PERIODDEF wave periods (lengths) definitions and nomenclature
 
  Definition of wave periods (lengths):
 ---------------------------------------
 
 
            <----- Direction of wave propagation 
 
                <-------Tu--------->
                :                  :
                <---Tc----->       :
                :          :       : <------Tcc---->
    M           :      c   :       : :             :
   / \          : M   / \_ :       : c_            c
  F   \         :/ \m/    \:       :/  \          / \  
 ------d--------u----------d-------u----d--------u---d-------- level v
        \      /            \     /     :\_    _/:   :\_   L
         \_   /              \_t_/      :  \t_/  :   :  \m/
           \t/                 :        :        :   :
            :                  :        <---Tt--->   : 
            <--------Ttt------->        :            :
                                        <-----Td----->
   Tu   = Up crossing period
   Td   = Down crossing period
   Tc   = Crest period, i.e., period between up crossing and 
          the next down crossing 
   Tt   = Trough period, i.e., period between down crossing and 
          the next up crossing
   Ttt  = Trough2trough period
   Tcc  = Crest2crest period
 
 
            <----- Direction of wave propagation 
 
                 <--Tcf->                              Tuc
                 :      :               <-Tcb->        <-> 
    M            :      c               :     :        : :
   / \           : M   / \_             c_    :        : c
  F   \          :/ \m/    \           /  \___:        :/ \  
 ------d---------u----------d---------u-------d--------u---d-------- level v
       :\_      /            \     __/:        \_    _/     \_   L
       :  \_   /              \_t_/   :          \t_/         \m/
       :    \t/                 :     :
       :     :                  :     : 
       <-Ttf->                  <-Ttb-> 
                 
  
   Tcf  = Crest front period, i.e., period between up crossing and crest
   Tcb  = Crest back period, i.e., period between crest and down crossing 
   Ttf  = Trough front period, i.e., period between down crossing and trough
   Ttb  = Trough back period, i.e., period between trough and up crossing 
 
  Also note that Tcf and Ttf can also be abbreviated by their crossing
  marker, e.g. Tuc (u2c)  and Tdt (d2t), respectively. Similar applies to all the
  other wave periods and wave lengths. 
  (The nomenclature for wave length is similar, just substitute T and
  period with L and length, respectively)
 
              <----- Direction of wave propagation 
 
                       <--TMm-->
            <-TmM->    :       :
    M       :     :    M       :
   / \      :     M   /:\_     :     M_            M
  F   \     :    / \m/ :  \    :    /: \          / \  
       \    :   /      :   \   :   / :  \        /   \
        \   :  /       :    \  :  /  :   \_    _/     \_   L
         \_ : /        :     \_m_/   :     \m_/         \m/
           \m/         :             :      :            :
                       <-----TMM----->      <----Tmm----->
 
 
   TmM = Period between minimum and the following Maximum
   TMm = Period between Maximum and the following minimum
   TMM = Period between Maximum and the following Maximum
   Tmm = Period between minimum and the following minimum
 
  See also  wavedef, ampdef, crossdef, tpdef

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

001 % PERIODDEF wave periods (lengths) definitions and nomenclature
002 %
003 % Definition of wave periods (lengths):
004 %---------------------------------------
005 %
006 %
007 %           <----- Direction of wave propagation 
008 %
009 %               <-------Tu--------->
010 %               :                  :
011 %               <---Tc----->       :
012 %               :          :       : <------Tcc---->
013 %   M           :      c   :       : :             :
014 %  / \          : M   / \_ :       : c_            c
015 % F   \         :/ \m/    \:       :/  \          / \  
016 %------d--------u----------d-------u----d--------u---d-------- level v
017 %       \      /            \     /     :\_    _/:   :\_   L
018 %        \_   /              \_t_/      :  \t_/  :   :  \m/
019 %          \t/                 :        :        :   :
020 %           :                  :        <---Tt--->   : 
021 %           <--------Ttt------->        :            :
022 %                                       <-----Td----->
023 %  Tu   = Up crossing period
024 %  Td   = Down crossing period
025 %  Tc   = Crest period, i.e., period between up crossing and 
026 %         the next down crossing 
027 %  Tt   = Trough period, i.e., period between down crossing and 
028 %         the next up crossing
029 %  Ttt  = Trough2trough period
030 %  Tcc  = Crest2crest period
031 %
032 %
033 %           <----- Direction of wave propagation 
034 %
035 %                <--Tcf->                              Tuc
036 %                :      :               <-Tcb->        <-> 
037 %   M            :      c               :     :        : :
038 %  / \           : M   / \_             c_    :        : c
039 % F   \          :/ \m/    \           /  \___:        :/ \  
040 %------d---------u----------d---------u-------d--------u---d-------- level v
041 %      :\_      /            \     __/:        \_    _/     \_   L
042 %      :  \_   /              \_t_/   :          \t_/         \m/
043 %      :    \t/                 :     :
044 %      :     :                  :     : 
045 %      <-Ttf->                  <-Ttb-> 
046 %                
047 % 
048 %  Tcf  = Crest front period, i.e., period between up crossing and crest
049 %  Tcb  = Crest back period, i.e., period between crest and down crossing 
050 %  Ttf  = Trough front period, i.e., period between down crossing and trough
051 %  Ttb  = Trough back period, i.e., period between trough and up crossing 
052 %
053 % Also note that Tcf and Ttf can also be abbreviated by their crossing
054 % marker, e.g. Tuc (u2c)  and Tdt (d2t), respectively. Similar applies to all the
055 % other wave periods and wave lengths. 
056 % (The nomenclature for wave length is similar, just substitute T and
057 % period with L and length, respectively)
058 %
059 %             <----- Direction of wave propagation 
060 %
061 %                      <--TMm-->
062 %           <-TmM->    :       :
063 %   M       :     :    M       :
064 %  / \      :     M   /:\_     :     M_            M
065 % F   \     :    / \m/ :  \    :    /: \          / \  
066 %      \    :   /      :   \   :   / :  \        /   \
067 %       \   :  /       :    \  :  /  :   \_    _/     \_   L
068 %        \_ : /        :     \_m_/   :     \m_/         \m/
069 %          \m/         :             :      :            :
070 %                      <-----TMM----->      <----Tmm----->
071 %
072 %
073 %  TmM = Period between minimum and the following Maximum
074 %  TMm = Period between Maximum and the following minimum
075 %  TMM = Period between Maximum and the following Maximum
076 %  Tmm = Period between minimum and the following minimum
077 %
078 % See also  wavedef, ampdef, crossdef, tpdef
079 
080 % history:
081 % revised pab 15.05.2000
082 % - minor corrections for Tcb
083 % - added Tmm, TMM, etc.....
084 % revised pab 21.01.2000
085 % - updated help header
086 % -  changed from: Wave propagating direction 
087 %              to: Direction of wave propagation
088 % by Per A. Brodtkorb 19.09.1999
089 
090 
091 more on
092 help perioddef
093 more off
094

Mathematical Statistics
Centre for Mathematical Sciences
Lund University with Lund Institute of Technology

Comments or corrections to the WAFO group


Generated on Thu 06-Oct-2005 02:21:16 for WAFO by m2html © 2003