.. _doc.MUSTANG.process:

Processes in sediment module MUSTANG
----------------------------------------

   
There are **2 options**  (2 versions) :  
       * **version 1** : 
            | used by default with key_sedim_MUSTANG, based on the model "mixsed" 
            | developped by Le Hir et al (2011)
       * **version 2** : 
            | used with key_sedim_MUSTANG && key_MUSTANG_V2, 
            | recently developped by B. Mengual and P. Le Hir 
            | to improve layer and porosity management, 
            | as well as erosion and deposition processes with mixing sediment (at cohesif and non cohesif regime). 
            | The bedload processes have taken into account in this new version (based on the developments of A. Rivier (2017)) 
            | (see Mengual, 2018 - Seine Aval report - Morphoseine Project)



 * The different computation steps for sediment module are :
       * 1. actualization of bathymetrie if morphodynamical coupling  
       * 2. computing bottom shear stress  :math:`=\tau_s` f(U,waves, roughness)(:ref:`doc.MUSTANG.shear`)
       * 3. computing settling rate in water column (:ref:`doc.MUSTANG.settling`)
       * 4. computing aggregation /fragmentation processes (:ref:`doc.MUSTANG.flocul`)
       * 5. computing settling trends (:ref:`doc.MUSTANG.settling`)
       * 6. extrapolation of sand concentration near bottom 
       * 7. sediment consolidation and diffusion/bioturbation into sediment layers  (:ref:`doc.MUSTANG.consol` , :ref:`doc.MUSTANG.diffu` and :ref:`doc.MUSTANG.bioturb`)
       * 8. computing total mass eroded transported by suspending or by bedload (:ref:`doc.MUSTANG.erosion`)
       * 9. after particules transport in water column, computing of effective deposit, updating  sediment layers (:ref:`doc.MUSTANG.deposit`)
       * 10. throughout the process, calculate the porosity of the  sand / mud mixture (:ref:`doc.MUSTANG.porosity`)


.. toctree::
   :maxdepth: 2
 
   doc.MUSTANG.shear
   doc.MUSTANG.settling   
   doc.MUSTANG.flocul
   doc.MUSTANG.deposit 
   doc.MUSTANG.erosion
   doc.MUSTANG.consol
   doc.MUSTANG.diffu
   doc.MUSTANG.bioturb
   doc.MUSTANG.morphocoupl
   doc.MUSTANG.porosity
   doc.MUSTANG.layers