Changes between Version 6 and Version 7 of DevelopmentActivities/ORCHIDEE-hydraulicArch


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Timestamp:
10/09/21 16:37:10 (4 months ago)
Author:
peylin
Comment:

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  • DevelopmentActivities/ORCHIDEE-hydraulicArch

    v6 v7  
    3535'''Discussion:''' 
    3636 
    37 Both models seem to have good results on the site studied. Several options are possible in ORCHIDEE, one would be a flag to activate one scheme or the other (but hard to maintain). The best option would be to implement a mixed version of both models keeping a resolution without iterations and introducing the dynamic resistances: 
     37Both models seem to have good results on the site studied: Yitong's model works well at Hesse and Julien simulate the temporal variations of LE at Caxana but with too low transpiration because he is using 2m of soil instead of 4m in Yitong. Several options are possible in ORCHIDEE, one would be a flag to activate one scheme or the other (but hard to maintain). The best option would be to implement a mixed version of both models keeping a resolution without iterations and introducing the dynamic resistances: 
    3838 - Root absorption: Best option would be to activate a flag to choose between the three models; 
    39  - Transport: Best option would be to have oth dynamic resistances and capacitances ; 
     39 - Transport: Best option would be to have both dynamic resistances and capacitances ; 
    4040 - Stomatal conductance: Best option would be to have only one stomatal conductance (this option leads to instabilities as mentioned in Julien’s model; 
    4141 - Resolution method: Best option would be to avoid iterations as much as possible. Moreover, recalculating the energy budget has to be avoid in order to remove iterations in mleb. 
     
    4444  - Improve the "predictor / corrector" approach 
    4545   
    46 Dynamic resistances are crucial for the mortality calculation (which is wanted in the next version of the trunk. 
     46Note that dynamic resistances are probably crucial for the mortality calculation (by hydraulic failure). 
    4747 
    4848'''Organisation:''' 
    49 Yitong is entering the final stretch of her PHD and will not have much time to allocate to the project before March 2022. It would be interesting that she only does a simulation with a precise configuration in order to look at the time calculation added by the iterations. This can be done over Hesse. 
    50 Julien will look closer on how to implement the two models and compare them. 
     49 
     50Yitong is entering the final stretch of her PHD and will not have much time to allocate to the project before March 2022.  
     51Suggestion: She could only do a simulation with a precise configuration in order to look at the extra-time calculation added by the iterations and the minpack solver.  
     52Julien will look closer on how to implement  some features of Yitong in his scheme or just the two versions in the same code in order to compare them. 
    5153 
    5254