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start:hype_model_description:hype_land

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start:hype_model_description:hype_land [2018/10/16 08:35]
cpers [Links to file reference]
start:hype_model_description:hype_land [2018/10/16 08:36]
cpers [Soil temperature and snow depth]
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 ==== Soil temperature and snow depth ==== ==== Soil temperature and snow depth ====
  
-Soil layer temperature (//​soiltemp//​) is calculated as a balance of three temperatures;​ previous time step soil layer temperature,​ soil temperature at deep depth (//​deeptemp//​) and air temperature (//temp//). The weight of the deep soil is constant (0.001), while the weight of the air temperature (//​weightair//​) depends on snow depth (//​snowdepth//​) and parameters. The soil memory (//​soilmem//​) depends on depth and land use, with parameters //surfmem// and //​depthrel//​. The memory of deep soil temperature is a general parameter (//​deepmem//​).+Soil layer temperature (//​soiltemp//​) is calculated as a balance of three temperatures;​ previous time step soil layer temperature,​ soil temperature at deep depth (//​deeptemp//​) and air temperature (//T//). The weight of the deep soil is constant (0.001), while the weight of the air temperature (//​weightair//​) depends on snow depth (//​snowdepth//​) and parameters. The soil memory (//​soilmem//​) depends on depth and land use, with parameters //surfmem// and //​depthrel//​. The memory of deep soil temperature is a general parameter (//​deepmem//​).
  
 <m> soilmem = {lbrace}{ <m> soilmem = {lbrace}{
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 <m> weigth_{air}={1}/​{soilmem+10*snowdepth} </m> <m> weigth_{air}={1}/​{soilmem+10*snowdepth} </m>
  
-<m> deeptemp=weight_{air}*temp+(1-weight_{air})*deeptemp </m>+<m> deeptemp=weight_{air}*T+(1-weight_{air})*deeptemp </m>
  
-<m> soiltemp=weight_{air}*temp+(1-weight_{air}-weight_{deep} )*soiltemp+weight_{deep}*deeptemp </m>+<m> soiltemp=weight_{air}*T+(1-weight_{air}-weight_{deep} )*soiltemp+weight_{deep}*deeptemp </m>
  
 In the default snow depth model, snow density (//​snowdens//​) depends on the snow's age in days (//​snowage//​). Snow density for fresh snow (//​sdnsnew//​) and the increase of density with snow age (//​snowdensdt//​) are general parameters (~ 0.1 and ~0.002). The snow's age increases by one every time step, but are weighted with age (0) for any new snow. In the default snow depth model, snow density (//​snowdens//​) depends on the snow's age in days (//​snowage//​). Snow density for fresh snow (//​sdnsnew//​) and the increase of density with snow age (//​snowdensdt//​) are general parameters (~ 0.1 and ~0.002). The snow's age increases by one every time step, but are weighted with age (0) for any new snow.
start/hype_model_description/hype_land.txt ยท Last modified: 2019/03/19 14:19 by cpers