start:hype_model_description:hype_land
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start:hype_model_description:hype_land [2020/02/07 12:48] cpers [Infiltration] |
start:hype_model_description:hype_land [2020/02/07 12:52] cpers [Infiltration] |
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| <m> infilt0 = rainfall + melt </m> | <m> infilt0 = rainfall + melt </m> | ||
| - | Part of the available water for infiltration (//infilt0//) may not infiltrate into the soil, due to limitations by the soil's infiltration capacity and other properties of the soil. The calculation of actual infiltration will consider effects of surface runoff, macropore flow and frozen soil. If the calculated infiltration is greater than zero, it is added to the upper layer soil water. This is done regardless of whether there is space in the soil pores there or not. If the water exceeds the water pore volume it is assumed to lie on the ground, but it still belongs to the upper soil layer, is totally mixed and thus has the same concentrations. | + | Part of the available water for infiltration (//infilt0//) may not infiltrate into the soil, due to limitations by the soil's infiltration capacity and other properties of the soil. The calculation of actual infiltration will consider effects of surface runoff, macropore flow and frozen soil. If the finally calculated infiltration is greater than zero, it is added to the upper layer soil water. This is done regardless of whether there is space in the soil pores there or not. If the water exceeds the water pore volume it is assumed to lie on the ground, but it still belongs to the upper soil layer, is totally mixed and thus has the same concentrations. |
| HYPE has an option for alternative calculation order of soil processes during a timestep. As default it calculates and add infiltration (and let the soil water percolate) before runoff and evaporation is calculated and removed from the soil water. Alternatively runoff and evapotranspiration is calculated before infiltration and percolation to slow the response of soil runoff. These options is tested during development of the soil routine. | HYPE has an option for alternative calculation order of soil processes during a timestep. As default it calculates and add infiltration (and let the soil water percolate) before runoff and evaporation is calculated and removed from the soil water. Alternatively runoff and evapotranspiration is calculated before infiltration and percolation to slow the response of soil runoff. These options is tested during development of the soil routine. | ||
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| - | Surface runoff due to limitation in infiltration capacity and macropore flow are calculated from the sum of snow melt and rainfall; the available infiltration (//infilt0//). | + | Surface runoff due to limitation in infiltration capacity and macropore flow are calculated from the sum of snow melt and rainfall; the water available for infiltration (//infilt0//). |
| - | If the current infiltration rate is greater than a threshold (//mactrinf//, mm/timestep) then macropore flow (//macroflow//) and surface runoff (//infoverflow//) may occur. In addition the the water in the upper soil layer need to be larger than another threshold (//mactrsm//). The two flows are calculated as a percentage (//macrate// respective //srrate//) of the infiltration above the first threshold; | + | If the current infiltration rate is greater than a threshold (//mactrinf//, mm/timestep) then macropore flow (//macroflow//) and surface runoff (//infoverflow//) may occur. In addition, the water in the upper soil layer needs to be larger than another threshold (//mactrsm//) for surface runoff and macropore flow to occur. The two flows are calculated as a percentage (//macrate// respective //srrate//) of the infiltration above the first threshold; |
| <m> macroflow = macrate * (infilt0 - mactrinf) </m> | <m> macroflow = macrate * (infilt0 - mactrinf) </m> | ||
start/hype_model_description/hype_land.txt ยท Last modified: 2024/02/21 10:05 by cpers
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