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

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