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--- en:manuel_reference:methode_micro:verif_habby [2021/12/02 10:38] – ylecoarer
+++ en:manuel_reference:methode_micro:verif_habby [2021/12/02 10:40] – ylecoarer
@@ Line 29: / Line 29: @@
 (1_biv) \[HSI_i=SI_{H,V}(H_i,V_i)\]
+The  weighted useable area WUA of the hydraulic model is obtained from equation (2) and the overall suitability index OSI from equation (3)
 (2) \[WUA=\sum_{i=1}^M A_i\times HSI_i\]
 (3) \[OSI=\frac{WUA}{\sum_{i=1}^M A_i}\]
-(4) \[{SI_{i,S}(S_{i,1},S_{i,2},..S_{i,K})}=\frac{\sum_{k=1}^K S_{i,k}\times SI_S(S_k)}{100} \]
-The  weighted useable area WUA of the hydraulic model is obtained from equation (2) and the overall suitability index OSI from equation (3)
 Note that in the particular case of a description of the substrate in percentages per $\mathit{S_k}$ classes and a calculation of habitat in % of substrate, the value of $\mathit{SI_S(S_i)}$ in equation (1) must be replaced by the formulation in equation (4). In this equation $\mathit{S_{i,k}}$ represents the % of substrate of class $\mathit{S_k}$ in mesh i, the substrate being described by a number K of particle size classes k ∈ $\mathit{[1,K]_N}$.
+(4) \[{SI_{i,S}(S_{i,1},S_{i,2},..S_{i,K})}=\frac{\sum_{k=1}^K S_{i,k}\times SI_S(S_k)}{100} \]
 Let us now check a HSI calculation in any mesh of a hydraulic model.