.. _doc.sedim.initial:

Initialization of sediment 
--------------------------

* The sediment is defined initially by :

    * either with an uniform bottom sediment (if **l_unised** = .TRUE.), set in parasedim.txt (:ref:`doc_parasedim`)

        * **hseduni** : initial uniform sediment thickness(m) 
        * **cseduni** : total initial sediment concentration
        * **ksmiuni** : lower grid cell indices in the sediment
        * **ksmauni** : upper grid cell indices in the sediment
        * **sini_sed** : initial interstitial water uniform salinity 
        * **tini_sed** : initial interstitial water uniform temperature
        * **csed_mud_ini** : mud concentration into initial sediment (if =0. ==> csed_mud_ini=cfreshmud)
      
        * concentrations of each particulae variable will be give in variable.dat (:ref:`definition_parasubstancesed`)
        * If there is a mixing of sand and mud, the initial total sediment thickness is automatically adjusted according to selected parameters and initial concentrations chosen for each type of sediment.
  
    * either reading a saved file, issued from a previous run

        * **l_repsed** must set to .TRUE. in parasedim.txt (:ref:`doc_parasedim`) 
        * and the name of the file to be read (**file_repsed**)

    * either defined by the user from knowledges of facies or mud fraction .... 
        * In this case, user must write the program, dependent on his configuration and data.