!-----------------------------------------------------------------------
&nam_btb     !   parameters for bioturbation and bioirrigation
!-----------------------------------------------------------------------
   dbiot       =  8.        ! Bioturbation coefficient (in cm2/yr)
   ln_btbz     =  .true.    ! Depth varying bioturbation 
   dbtbzsc     =  5.0       ! coefficient for btb attenuation. If no variation, depth of the mixed layer
   adsnh4      =  4.16      ! Adsorption coefficient of NH4
   adsfe2      =  697.0     ! Adsorption coefficient of Fe2
   ln_irrig    =  .true.    ! Bioirrigation in sediment
   xirrzsc     =  2.0       ! Vertical scale of the attentuation of bioirrigation [cm]
/