.. _calculs0:

Calculs préliminaires
========================
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  |  **Calculs preliminaires**             |       **Variables locales**      |            **Commentaires**                                              |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  |  profondeur totale                     |        d                         |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  |  epaisseur de la maille (m)            |    dzu ou epn                    |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  |  si maille de fond                     |    ibbenth=1                     |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  |  si maille de surface                  |    ibsurf=1                      |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | salinité                               |    sali                          |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------- ----+
  | température    (°C)                    |    temper                        |   ATTENTION si temper>30 : temper=15 degC (pas de modif de tempabs ??)   |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | température absolue (K)                |    tempabs                       |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | Effet limitant de la lumiere           |     effetchaleur   (ss dim)      |               see :ref:`effet.temp`                                      | 
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | Effet limitant de la turbidité         |     effetturbidite  (ss dim)     |        see :ref:`contenu.chloro`                                         |
  | sur le contenu chlorophyliien du phyto |                                  |                                                                          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | Facteur de conversion                  |     rapsiaz, et rappaz           | = p_phyto_SiNratio  et :math:`\frac{1}{\alpha_{NPratio}}`  voir tableau  |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | Filtration et broutage benthos         |     txfiltbenth                  | = p_txfiltbenthmax voir tableau  + :ref:`broutage.benthos`               |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+
  | Fraction NO3 et NH4                    |     fractionno3, fractionnh4     |   :math:`\frac{NO_3}{(NO_3+NH_4)}     \frac{NH_4}{(NO_3+NH_4)}`          |
  +----------------------------------------+----------------------------------+--------------------------------------------------------------------------+