tbasal_resistance.hh - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       tbasal_resistance.hh (2314B)
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            1 // Copyright (C) 2004-2015, 2017, 2019 Jed Brown, Ed Bueler, and Constantine Khroulev
            2 //
            3 // This file is part of PISM.
            4 //
            5 // PISM is free software; you can redistribute it and/or modify it under the
            6 // terms of the GNU General Public License as published by the Free Software
            7 // Foundation; either version 3 of the License, or (at your option) any later
            8 // version.
            9 //
           10 // PISM is distributed in the hope that it will be useful, but WITHOUT ANY
           11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
           12 // FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
           13 // details.
           14 //
           15 // You should have received a copy of the GNU General Public License
           16 // along with PISM; if not, write to the Free Software
           17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
           18 
           19 #ifndef __basal_resistance_hh
           20 #define __basal_resistance_hh
           21 
           22 #include "pism/util/Units.hh"
           23 
           24 namespace pism {
           25 
           26 class Config;
           27 class Logger;
           28 
           29 //! Class containing physical constants and the constitutive relation describing till for SSA.
           30 /*!
           31   This *pseudo* -plastic type can actually describe anything from linearly
           32   viscous till to purely plastic till.
           33 */
           34 class IceBasalResistancePlasticLaw {
           35 public:
           36   IceBasalResistancePlasticLaw(const Config &config);
           37   virtual ~IceBasalResistancePlasticLaw();
           38   virtual void print_info(const Logger &log, int threshold, units::System::Ptr system) const;
           39   virtual double drag(double tauc, double vx, double vy) const;
           40   virtual void drag_with_derivative(double tauc, double vx, double vy,
           41                                     double *drag, double *ddrag) const;
           42 protected:
           43   double m_plastic_regularize;
           44 };
           45 
           46 class IceBasalResistancePseudoPlasticLaw : public IceBasalResistancePlasticLaw{
           47 public:
           48   IceBasalResistancePseudoPlasticLaw(const Config &config);
           49   virtual ~IceBasalResistancePseudoPlasticLaw();
           50   virtual void print_info(const Logger &log, int threshold, units::System::Ptr system) const;
           51   virtual double drag(double tauc, double vx, double vy) const;
           52   virtual void drag_with_derivative(double tauc, double vx, double vy,
           53                                     double *drag, double *ddrag) const;
           54 protected:
           55   double m_pseudo_q, m_pseudo_u_threshold, m_sliding_scale_factor_reduces_tauc;
           56 };
           57 
           58 } // end of namespace pism
           59 
           60 #endif /* __basal_resistance_hh */
           61