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GEOFRAMECafe Stefano Della Chiesa
 

GEOFRAMECafe Stefano Della Chiesa

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    GEOFRAMECafe Stefano Della Chiesa GEOFRAMECafe Stefano Della Chiesa Presentation Transcript

    • Tab 1 SENSITIVITY ANALYSIS stb_stn Objective: We choose here an inclined or flat plane domain to perform plot scale simulations, to check the sensitivity of the energy balance partition to slope, vegetation properties, initial conditions. Simulations name: stb_stn Results folders: - Results elaborations in: /Users/giacomo/EURAC/Stubai/Results/stb_stn/stb_stn.ppt - Figures saved in: /Users/giacomo/EURAC/Stubai/Results/stb_stn/Figures/ - Matlab elaborations in: /Users/giacomo/GeoMatlab/Mfiles_points/ load_sensitivity.m plot_sensitivity.m - Input inclined DTM in: /Users/giacomo/EURAC/Stubai/Inputs/Piano.xls - Parameters settings in: /Users/giacomo/EURAC/Stubai/Inputs/Inpts_stb_stn004.xls - Simulations index in: /Users/giacomo/EURAC/Stubai/Simulations/sim_stb_stn.txt Simulation assumptions: - Flat (or inclined) 11x11 dtm - Forcing as stb_tot simulations (Clear sky days in September 1999) - Reference simulation with intermediate parameters (stb_stn004f) zo=0.1 m; do=0.66 m fc=0.5 (for all parameters see 'sensitivity' in Inpts_stb_stn004.xls) - Saturated initial conditions, 10 days spin up. - Soil parameters as in Neustift station soil (very organic soil at the surface).
    • Fig 1 Reference simulation stb_stn004f Flat, fc=05, zo=0.1 m
    • Fig 3 Sensitivity to aspect stb_stn004f-004s-004n Flat 30 o S 30 o N
    • Fig 4 Sensitivity to canopy fraction fc stb_stn007-008 fc=1 fc=0.5 fc=0
    • Fig 5 Sensitivity to roughness length zo stb_stn007-008 zo=0.001 m zo=0.1 m zo=1 m
    • Fig 9 Sensitivity to soil thermal properties effect on surface fluxes stb_stn013-015 k_solid = 8.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K) k_solid = 0.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K) k_solid = 0.5 W/(m K) c_solid = 1 E6 J/(m^3 K) k_solid = 8.5 W/(m K) c_solid = 1 E6 J/(m^3 K) Very little effect on surface fluxes
    • Fig 10 Sensitivity to soil thermal properties effect on surface temperature stb_stn013-015 k_solid = 8.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K) k_solid = 0.5 W/(m K) c_solid = 2.16 E6 J/(m^3 K) k_solid = 0.5 W/(m K) c_solid = 1 E6 J/(m^3 K) k_solid = 8.5 W/(m K) c_solid = 1 E6 J/(m^3 K) Strong effect of soil conductivity on surface temperature , especially the night ones (low soils with low conductivity, as limestone and organic ones (or dry grass) have very low nocturnal skin temperatures and higher daily ones)
    • Fig 11 Sensitivity to air temperature stb_stn016-017 BASE
      • - see Table in inpts-stb_stn004.xls
      • - a change in Ta simply translates Ts
      • very little change in fluxes (less than 2 W/m2 );
      • Ts quickly adapts itself to the new Ta
      • - if Ta increase very slight decrease of LE and G, decrease of H
      • - very simplistic conclusion: if only Ta changes, does no change the energy forcing,what does it change is - the frozen / unfrozen threshold and the consequent phenology - the competitive advantage among species
      TA + 2C TA - 2C
    • Getop land cover parameterization - a sensitivity analysis Study area: Neustift Date of simulation: September 1999 run  10 days   LU parameters Soil parameters r/c 1 forest r/c 1 grass 5 1 Zo ow min 5 zo 0,02 6 10 hc m 6 0,2 hc m 7 10 hc/zo 7 10 hc/zo 9 1 fc 9 1 fc 10 250 root mm 10 150 root mm 11 6 LAI 11 5 LAI 12 0,2 albedo 12 0,2 albedo 14 50 sigma K 14 30 sigma K 15 20 h_sup 15 10 h_sup             r/c 1 bare soil r/c 1 rocks 1 7 lu 1 8 lu 2 1 rough 2 1 rough 3 1 zo rough 3 10 zo rough 4 10 zo snow 4 10 zo snow 12 0,2 albedo 12 0,2 albedo 13 1 C_m 13 1 C_m 14 1 sigma K 14 1 sigma K 15 1 h_sup 15 1 h_sup r/c 1 forest r/c 1 grass 1 1 ClasseSoil 1 2 ClasseSoil 2 1,00-02 Kh_sat 2 1,00E-03 Kh_sat 3 0,15 teta_r 3 0,05 teta_r 4 0,5 teta_sat 4 0,4 teta_sat 7 0,74 k_solid 7 1 k_solid 8 2,16E-06 c_solid 8 2,16E+06 c_solid 9 0,2 teta_wp 9 0,15 teta_wp 10 0,3 teta_fc 10 0,3 teta_fc     r/c 1 bare soil r/c 1 rocks 1 7 ClasseSoil 1 8 ClasseSoil 2 1,00E-04 Kh_sat 2 1,00E-06 Kh_sat 3 0,1 teta_r 3 0,02 teta_r 4 0,4 teta_sat 4 0,025 teta_sat 7 1,5 k_solid 7 4 k_solid 8 2,16E+06 c_solid 8 2,16E+06 c_solid 9 0,15 teta_wp 9 0,03 teta_wp 10 0,2 teta_fc 10 0,08 teta_fc
    • Inputs: hydraulic conductivity
    • Inputs: Soil water content
    • Forest Rocks Bare Soil Grass
    • Forest Rocks Bare Soil Grass
    • Tair Tsurface Forest Rocks Bare Soil Grass
    • Forest Rocks Bare Soil Grass
    • Forest Rocks Bare Soil Grass
    • Forest Rocks Bare Soil Grass
    • Forest Rocks Bare Soil Grass