Model Equations

Here are the equations used for the Human Body Decomposition STELLA model:

Total_Body_Weight(t) = Total_Body_Weight(t - dt) + (- decay_process) * dt
decay_process = (Decay_by_insects+burial_depth_activity+Carnivores_activity)*Total_Body_Weight
Decay_by_insects = Clothing_activity+Humidity_activity+Rainfall_activity+Temperature_activity+Trauma_activity

INIT Total_Body_Weight = 150
burial_depth = 2
Carnivores = 25
Clothing = 60
Humidity = 65
Rainfall = 2
Temperature = 15
Trauma_to_body = 50

burial_depth_activity = GRAPH(burial_depth) (0.00, 0.0995), (1.00, 0.073), (2.00, 0.056), (3.00, 0.04), (4.00, 0.0305), (5.00, 0.022), (6.00, 0.0135), (7.00, 0.008), (8.00, 0.0045), (9.00, 0.0015), (10.0, 0.00)
Carnivores_activity = GRAPH(Carnivores) (0.00, 0.00), (10.0, 0.001), (20.0, 0.002), (30.0, 0.003), (40.0, 0.004), (50.0, 0.005), (60.0, 0.006), (70.0, 0.007), (80.0, 0.008), (90.0, 0.009), (100, 0.01)
Clothing_activity = GRAPH(Clothing) (0.00, 0.00), (10.0, 0.0001), (20.0, 0.0002), (30.0, 0.0003), (40.0, 0.0004), (50.0, 0.0005), (60.0, 0.0006), (70.0, 0.0007), (80.0, 0.0008), (90.0, 0.0009), (100, 0.001)
Humidity_activity = GRAPH(Humidity) (0.00, 0.00), (10.0, 0.0008), (20.0, 0.00165), (30.0, 0.0028), (40.0, 0.00385), (50.0, 0.00505), (60.0, 0.00605), (70.0, 0.0073), (80.0, 0.008), (90.0, 0.00855), (100, 0.01)
Rainfall_activity = GRAPH(Rainfall) (0.00, 0.00), (0.5, 0.0001), (1.00, 0.0002), (1.50, 0.0003), (2.00, 0.0004), (2.50, 0.0005), (3.00, 0.0006), (3.50, 0.0007), (4.00, 0.0008), (4.50, 0.0009), (5.00, 0.001)
Temperature_activity = GRAPH(Temperature) (0.00, 0.0005), (3.00, 0.0005), (6.00, 0.0005), (9.00, 0.0025), (12.0, 0.007), (15.0, 0.0135), (18.0, 0.0185), (21.0, 0.0255), (24.0, 0.0345), (27.0, 0.058), (30.0, 0.0995)
Trauma_activity = GRAPH(Trauma_to_body) (0.00, 0.00), (10.0, 0.001), (20.0, 0.002), (30.0, 0.003), (40.0, 0.004), (50.0, 0.005), (60.0, 0.006), (70.0, 0.007), (80.0, 0.008), (90.0, 0.009), (100, 0.01)