Changeset 2955
- Timestamp:
- 2011-10-18T18:05:09+02:00 (12 years ago)
- Location:
- branches/2011/dev_r2787_MERCATOR2_tidalharm/DOC/TexFiles
- Files:
-
- 1 added
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
branches/2011/dev_r2787_MERCATOR2_tidalharm/DOC/TexFiles/Chapters/Chap_DIA.tex
r2541 r2955 685 685 686 686 % ------------------------------------------------------------------------------------------------------------- 687 % Harmonic analysis of tidal constituents 688 % ------------------------------------------------------------------------------------------------------------- 689 \section{Harmonic analysis of tidal constituents (\key{diaharm}) } 690 \label{DIA_diag_harm} 691 692 A module is available to compute the amplitude and phase for tidal waves. 693 This diagnostic is actived with \key{diaharm}. 694 695 %------------------------------------------namdia_harm---------------------------------------------------- 696 \namdisplay{namdia_harm} 697 %---------------------------------------------------------------------------------------------------------- 698 699 Concerning the on-line Harmonic analysis, some parameters are available in namelist: 700 701 - \texttt{nit000\_han} is the first time step used for harmonic analysis 702 703 - \texttt{nitend\_han} is the last time step used for harmonic analysis 704 705 - \texttt{nstep\_han} is the time step frequency for harmonic analysis 706 707 - \texttt{nb\_ana} is the number of harmonics to analyse 708 709 - \texttt{tname} is an array with names of tidal constituents to analyse 710 711 \texttt{nit000\_han} and \texttt{nitend\_han} must be between \texttt{nit000} and \texttt{nitend} of the simulation. 712 The restart capability is not implemented. 713 714 The Harmonic analysis solve this equation: 715 \begin{equation} 716 h_{i} - A_{0} + \sum^{nb\_ana}_{j=1}[A_{j}cos(\nu_{j}t_{j}-\phi_{j})] = e_{i} 717 \end{equation} 718 719 With $A_{j}$,$\nu_{j}$,$\phi_{j}$, the amplitude, frequency and phase for each wave and $e_{i}$ the error. 720 $h_{i}$ is the sea level for the time $t_{i}$ and $A_{0}$ is the mean sea level. \\ 721 We can rewrite this equation: 722 \begin{equation} 723 h_{i} - A_{0} + \sum^{nb\_ana}_{j=1}[C_{j}cos(\nu_{j}t_{j})+S_{j}sin(\nu_{j}t_{j})] = e_{i} 724 \end{equation} 725 with $A_{j}=\sqrt{C^{2}_{j}+S^{2}_{j}}$ et $\phi_{j}=arctan(S_{j}/C_{j})$. 726 727 We obtain in output $C_{j}$ and $S_{j}$ for each tidal wave. 728 729 % ------------------------------------------------------------------------------------------------------------- 687 730 % Other Diagnostics 688 731 % ------------------------------------------------------------------------------------------------------------- … … 735 778 736 779 737 738 780 % ================================================================ 739 781 % Steric effect in sea surface height
Note: See TracChangeset
for help on using the changeset viewer.