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en:manuel_reference:methode_micro:verif_habby [2021/11/29 15:16] – ylecoarer | en:manuel_reference:methode_micro:verif_habby [2021/12/02 10:37] – ylecoarer | ||
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For a given variable, and for discrete values of the latter, the biological model provides suitability index SI given values between 0 and 1, qualifying the ' | For a given variable, and for discrete values of the latter, the biological model provides suitability index SI given values between 0 and 1, qualifying the ' | ||
- | Equation (1) allows the calculation of the habitat suitability index $\mathit{HSI_i}$ in a mesh of index i and area Ai of a hydraulic model, from the average | + | Equation (1) is used to calculate |
- | (1) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i)\] | + | (1a) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i)\] |
- | (2) \[WUA=sum_{i=1}^M | + | (1b) \[HSI_i=(SI_H(H_i)\times SI_V(V_i)\times SI_S(S_i))^\frac{1}{3}\] |
- | (3) \[OSI=frac{WUA}{sum_{i=1}^M A_i}\] | + | (1c) \[HSI_i=\frac{SI_H(H_i)+ SI_V(V_i)+ SI_S(S_i)}{3}\] |
+ | |||
+ | In case the user decides to use only two variables for example (H,V), these equations are adapted in HABBY and become : | ||
+ | |||
+ | (1_a2) \[HSI_i=SI_H(H_i)\times SI_V(V_i)\] | ||
+ | (1_b2) \[HSI_i=(SI_H(H_i)\times SI_V(V_i))^\frac{1}{2}\] | ||
+ | (1_c2) \[HSI_i=frac{SI_H(H_i)+ SI_V(V_i)}{2}\] | ||
+ | |||
+ | The logics (a) product, (b) geometric mean and (c) mean are respected. | ||
+ | |||
+ | In the case where the biological model is bivariate (H,V) equation (1) is written : | ||
+ | |||
+ | (1_biv) \[HSI_i=SI_{H, | ||
+ | |||
+ | |||
+ | (2) \[WUA=\sum_{i=1}^M | ||
+ | (3) \[OSI=\frac{WUA}{\sum_{i=1}^M A_i}\] | ||
(4) \[{SI_{i, | (4) \[{SI_{i, | ||
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First check the information in the mesh: | First check the information in the mesh: | ||
* Substrate information S from your original data, in case your substrate is described in percentages of size classes, identify the coarser (Coarser) or dominant (Dominant) substrate that is required for the biological model. | * Substrate information S from your original data, in case your substrate is described in percentages of size classes, identify the coarser (Coarser) or dominant (Dominant) substrate that is required for the biological model. | ||
- | * In the case of a 2D finite volume hydraulic simulation, identify the average | + | * In the case of a 2D finite volume hydraulic simulation, identify the mean height and mean velocity, which should be those of your original data. |
- | * In the case of a 2D hydraulic simulation in finite | + | * In the case of a 2D hydraulic simulation in finite |
Check the $\mathit{SI_H(H)}$ , $\mathit{SI_V(V)}$ values by performing linear interpolations with the biological model data. | Check the $\mathit{SI_H(H)}$ , $\mathit{SI_V(V)}$ values by performing linear interpolations with the biological model data. | ||
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Finally check the habitat value of the $\mathit{HSI}$ mesh using equation (1). | Finally check the habitat value of the $\mathit{HSI}$ mesh using equation (1). | ||
+ | |||
+ | You can also check the overall results of the hydraulic simulation from the mesh attribute table and equations (2) and (3). | ||
Clarification: | Clarification: |