fix Eta calcul

compute_yield.py

@@ -19,7 +19,7 @@ def calculate_ETx(Kc, ETo):
     ETx = Kc * ETo
     return ETx
 
-def calculate_ETa(ETx, soil_moisture, field_capacity, wilting_point):
+def calculate_ETa(ETx, soil_moisture, field_capacity, wilting_point, water_deficit):
     """
     Calculate the actual evapotranspiration (ETa) using the maximum evapotranspiration (ETx), soil moisture, field capacity, and wilting point.
 
@@ -37,7 +37,10 @@ def calculate_ETa(ETx, soil_moisture, field_capacity, wilting_point):
     elif soil_moisture < wilting_point:
         ETa = 0
     else:
-        ETa = ETx * ((soil_moisture - wilting_point) / (field_capacity - wilting_point))
+        WA = (field_capacity−wilting_point) * root_depth # wter availaible in the root zone
+        root_depth = 0.3
+        Ks = ( WA - water_deficit)/ WA # coef de stress hydrique
+        ETa = ETx * Ks
     
     return ETa