Add cutoff pressures to Tian

GeodynamicWorldBuilder · Aug 16, 2024 · e118bf7 · e118bf7
1 parent 199b8cd
commit e118bf7
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Showing 4 changed files with 36 additions and 15 deletions.
diff --git a/include/world_builder/features/oceanic_plate_models/composition/water_content.h b/include/world_builder/features/oceanic_plate_models/composition/water_content.h
@@ -92,7 +92,7 @@ namespace WorldBuilder
             double min_depth;
             Objects::Surface min_depth_surface;
             double max_depth;
-            double density;
+            double density; // Density used to compute the lithostatic pressure
             Objects::Surface max_depth_surface;
             std::vector<unsigned int> compositions;
             Operations operation;
@@ -118,6 +118,10 @@ namespace WorldBuilder
             std::vector<double> LR_poly_sediment = {-2.03283, 10.8186, -21.2119, 18.3351, -6.48711, 8.32459};
             std::vector<double> c_sat_poly_sediment = {-0.150662, 0.301807, 1.01867};
             std::vector<double> Td_poly_sediment = {2.83277, -24.7593, 85.9090, 524.898};
+
+            // Maximum pressure for the lithologies (Peridotite, Gabbro, MORB, Sediment). Above these
+            // pressures, the parameterized phase diagrams break down and the solubility goes to infinity.
+            std::vector<double> pressure_cutoffs {10, 26, 16, 1.0};
         };
       } // namespace Composition
     } // namespace OceanicPlateModels

diff --git a/include/world_builder/features/subducting_plate_models/composition/water_content.h b/include/world_builder/features/subducting_plate_models/composition/water_content.h
@@ -90,7 +90,7 @@ namespace WorldBuilder
             // water_content composition submodule parameters
             double min_depth;
             double max_depth;
-            double density;
+            double density; // Density used to calculate the lithostatic pressure
             std::vector<unsigned int> compositions;
             Operations operation;
             std::string lithology_str;
@@ -115,6 +115,10 @@ namespace WorldBuilder
             std::vector<double> LR_poly_sediment = {-2.03283, 10.8186, -21.2119, 18.3351, -6.48711, 8.32459};
             std::vector<double> c_sat_poly_sediment = {-0.150662, 0.301807, 1.01867};
             std::vector<double> Td_poly_sediment = {2.83277, -24.7593, 85.9090, 524.898};
+
+            // Maximum pressure for the lithologies (Peridotite, Gabbro, MORB, Sediment). Above these
+            // pressures, the parameterized phase diagrams break down and the solubility goes to infinity.
+            std::vector<double> pressure_cutoffs {10, 26, 16, 1.0};
         };
       } // namespace Composition
     } // namespace SubductingPlateModels

diff --git a/source/world_builder/features/oceanic_plate_models/composition/water_content.cc b/source/world_builder/features/oceanic_plate_models/composition/water_content.cc
@@ -102,9 +102,9 @@ namespace WorldBuilder
         double
         WaterContent::calculate_water_content(double pressure,
                                               double temperature,
-                                              std::string lithology_str) const
+                                              std::string lithology_string) const
         {
-          double inv_pressure = 1/pressure;
+          pressure = pressure <= 0.5 ? 0.5 : pressure;
           double ln_LR_value = 0;
           double ln_c_sat_value = 0;
           double Td_value = 0;
@@ -121,43 +121,49 @@ namespace WorldBuilder
           };
           LithologyName lithology = peridotite;
 
-          if (lithology_str=="peridotite")
+          if (lithology_string=="peridotite")
             lithology = peridotite;
-          else if (lithology_str=="gabbro")
+          else if (lithology_string=="gabbro")
             lithology = gabbro;
-          else if (lithology_str=="MORB")
+          else if (lithology_string=="MORB")
             lithology = MORB;
-          else if (lithology_str=="sediment")
+          else if (lithology_string=="sediment")
             lithology = sediment;
 
           if (lithology == peridotite)
             {
               LR_polynomial_coeffs = LR_poly_peridotite;
               c_sat_polynomial_coeffs = c_sat_poly_peridotite;
               Td_polynomial_coeffs = Td_poly_peridotite;
+              pressure = pressure > pressure_cutoffs[0] ? pressure_cutoffs[0] : pressure;
             }
 
           if (lithology == gabbro)
             {
               LR_polynomial_coeffs = LR_poly_gabbro;
               c_sat_polynomial_coeffs = c_sat_poly_gabbro;
               Td_polynomial_coeffs = Td_poly_gabbro;
+              pressure = pressure > pressure_cutoffs[1] ? pressure_cutoffs[1] : pressure;
             }
 
           if (lithology == MORB)
             {
               LR_polynomial_coeffs = LR_poly_MORB;
               c_sat_polynomial_coeffs = c_sat_poly_MORB;
               Td_polynomial_coeffs = Td_poly_MORB;
+              pressure = pressure > pressure_cutoffs[2] ? pressure_cutoffs[2] : pressure;
             }
 
           if (lithology == sediment)
             {
               LR_polynomial_coeffs = LR_poly_sediment;
               c_sat_polynomial_coeffs = c_sat_poly_sediment;
               Td_polynomial_coeffs = Td_poly_sediment;
+              pressure = pressure > pressure_cutoffs[3] ? pressure_cutoffs[3] : pressure;
             }
 
+          double inv_pressure = 1/pressure;
+
           // Calculate the c_sat value from Tian et al., 2019
           if (lithology == sediment)
             {

diff --git a/source/world_builder/features/subducting_plate_models/composition/water_content.cc b/source/world_builder/features/subducting_plate_models/composition/water_content.cc
@@ -74,7 +74,7 @@ namespace WorldBuilder
           prm.declare_entry("initial water content", Types::Double(5),
                             "The value of the initial water content (in wt%) for the lithology at the trench. This is essentially the "
                             "max value applied to this lithology.");
-          prm.declare_entry("operation", Types::String("replace", std::vector<std::string> {"replace", "replace defined only", "add", "subtract"}),
+          prm.declare_entry("operation", Types::String("add", std::vector<std::string> {"replace", "replace defined only", "add", "subtract"}),
                             "Whether the value should replace any value previously defined at this location (replace) or "
                             "add the value to the previously define value. Replacing implies that all compositions not "
                             "explicitly defined are set to zero. To only replace the defined compositions use the replace only defined option.");
@@ -97,9 +97,9 @@ namespace WorldBuilder
         double
         WaterContent::calculate_water_content(double pressure,
                                               double temperature,
-                                              std::string lithology_str) const
+                                              std::string lithology_string) const
         {
-          double inv_pressure = 1/pressure;
+          pressure = pressure <= 0.5 ? 0.5 : pressure;
           double ln_LR_value = 0;
           double ln_c_sat_value = 0;
           double Td_value = 0;
@@ -114,45 +114,52 @@ namespace WorldBuilder
             MORB,
             sediment
           };
+
           LithologyName lithology = peridotite;
 
-          if (lithology_str=="peridotite")
+          if (lithology_string=="peridotite")
             lithology = peridotite;
-          else if (lithology_str=="gabbro")
+          else if (lithology_string=="gabbro")
             lithology = gabbro;
-          else if (lithology_str=="MORB")
+          else if (lithology_string=="MORB")
             lithology = MORB;
-          else if (lithology_str=="sediment")
+          else if (lithology_string=="sediment")
             lithology = sediment;
 
           if (lithology == peridotite)
             {
               LR_polynomial_coeffs = LR_poly_peridotite;
               c_sat_polynomial_coeffs = c_sat_poly_peridotite;
               Td_polynomial_coeffs = Td_poly_peridotite;
+              pressure = pressure > pressure_cutoffs[0] ? pressure_cutoffs[0] : pressure;
             }
 
           if (lithology == gabbro)
             {
               LR_polynomial_coeffs = LR_poly_gabbro;
               c_sat_polynomial_coeffs = c_sat_poly_gabbro;
               Td_polynomial_coeffs = Td_poly_gabbro;
+              pressure = pressure > pressure_cutoffs[1] ? pressure_cutoffs[1] : pressure;
             }
 
           if (lithology == MORB)
             {
               LR_polynomial_coeffs = LR_poly_MORB;
               c_sat_polynomial_coeffs = c_sat_poly_MORB;
               Td_polynomial_coeffs = Td_poly_MORB;
+              pressure = pressure > pressure_cutoffs[2] ? pressure_cutoffs[2] : pressure;
             }
 
           if (lithology == sediment)
             {
               LR_polynomial_coeffs = LR_poly_sediment;
               c_sat_polynomial_coeffs = c_sat_poly_sediment;
               Td_polynomial_coeffs = Td_poly_sediment;
+              pressure = pressure > pressure_cutoffs[3] ? 1.0 : pressure;
             }
 
+          double inv_pressure = 1/pressure;
+
           // Calculate the c_sat value from Tian et al., 2019
           if (lithology == sediment)
             {