tDrainageCalculator.hh - pism - [fork] customized build of PISM, the parallel ice sheet model (tillflux branch)
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       tDrainageCalculator.hh (1940B)
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            1 // Copyright (C) 2009-2011, 2013, 2014, 2015, 2016, 2017 Andreas Aschwanden, 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 __DrainageCalculator_hh
           20 #define __DrainageCalculator_hh
           21 
           22 #include "pism/util/ConfigInterface.hh"
           23 
           24 namespace pism {
           25 namespace energy {
           26 
           27 //! Compute the rate of drainage D(omega) for temperate ice.
           28 class DrainageCalculator {
           29 
           30 public:
           31   DrainageCalculator(const Config &config) {
           32     OM1 = config.get_number("energy.drainage_target_water_fraction"); // 0.01
           33     OM2 = 2.0 * OM1;
           34     OM3 = 3.0 * OM1;
           35     DR3 = config.get_number("energy.drainage_maximum_rate"); // 0.05 year-1
           36     DR2 = 0.1 * DR3;
           37   }
           38   virtual ~DrainageCalculator() {}
           39 
           40   //! Return D(omega), as in figure in [\ref AschwandenBuelerKhroulevBlatter].
           41   virtual double get_drainage_rate(double omega) {
           42     if (omega > OM1) {
           43       if (omega > OM2) {
           44         if (omega > OM3) {
           45           return DR3;
           46         } else {
           47           return DR2 + (DR3 - DR2) * (omega - OM2) / OM1;
           48         }
           49       } else {
           50         return DR2 * (omega - OM1) / OM1;
           51       }
           52     } else {
           53       return 0.0;
           54     }
           55   }
           56 
           57 private:
           58   double OM1, OM2, OM3, DR2, DR3;
           59 };
           60 
           61 
           62 } // end of namespace energy
           63 } // end of namespace pism
           64 
           65 #endif // __DrainageCalculator_hh
           66