start:hype_model_description:processes_above_ground
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start:hype_model_description:processes_above_ground [2018/08/10 15:41] cpers [Precipitation adjustments] |
start:hype_model_description:processes_above_ground [2018/08/10 15:43] cpers [Evaporation] |
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| Evaporation from soil is assumed to occur from the two upper layers. The potential evaporation is assumed to decrease exponentially with depth (depending on the parameter //epotdist//). The potential evaporation is divided between the two layers (//epotfrac//) with the distribution depending on the potential evaporation in the midpoint of each soil layer (figure 1). This is then used by approximating to a rectangle. Since soil layers differ between classes, the evaporation distribution do to. | Evaporation from soil is assumed to occur from the two upper layers. The potential evaporation is assumed to decrease exponentially with depth (depending on the parameter //epotdist//). The potential evaporation is divided between the two layers (//epotfrac//) with the distribution depending on the potential evaporation in the midpoint of each soil layer (figure 1). This is then used by approximating to a rectangle. Since soil layers differ between classes, the evaporation distribution do to. | ||
| - | <m> epot1 = EXP(-epotdist*soillayerdepth(1){/}2) </m> | + | <m> epot1 = EXP(- epotdist*soillayerdepth(1){/}2) </m> |
| - | <m> epot2 = EXP(-epotdist*(soillayerdepth(1)+{soillayerdepth(2)- | + | <m> epot2 = EXP(- epotdist*(soillayerdepth(1)+{soillayerdepth(2)- |
| soillayerdepth(1)}/2)) </m> | soillayerdepth(1)}/2)) </m> | ||
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| Line 130: | Line 130: | ||
| The actual evaporation is set to zero for temperatures below the threshold temperature and for negative potential evaporation estimates (condensation). The soil evapotranspiration reduction is calculated as: | The actual evaporation is set to zero for temperatures below the threshold temperature and for negative potential evaporation estimates (condensation). The soil evapotranspiration reduction is calculated as: | ||
| - | <m> factor = 1-e^(-tredA*(soiltemp-ttrig)^tredB) </m> | + | <m> factor = 1-e^( - tredA*(soiltemp-ttrig)^tredB) </m> |
| <m> evapp = evapp*factor </m> | <m> evapp = evapp*factor </m> | ||
start/hype_model_description/processes_above_ground.txt ยท Last modified: 2024/02/21 08:54 by cpers
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