start:hype_model_description:hype_np_soil
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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start:hype_model_description:hype_np_soil [2018/02/23 10:56] cpers [Nutrient soil leakage from outer source] |
start:hype_model_description:hype_np_soil [2018/06/20 12:59] cpers [Soil erosion] |
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| <m> erodedSed = 1000 * (MobilisedRain + MobilisedSedSR) * transportfactor </m> | <m> erodedSed = 1000 * (MobilisedRain + MobilisedSedSR) * transportfactor </m> | ||
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| - | The alternative erosion model calculates eroded sediment (//erodedSed// (kg/km2)) based on precipitation (//prec//) and a number of model parameters. | + | The alternative erosion model calculates eroded sediment (//erodedSed// (kg/km2)) based on precipitation (//prec//) and a number of model parameters and subbasin input data. |
| <m> erodedSed = 1000. * ({slope / 5})^{erodslope} * erodluse * erodsoil * {EI/erodindex} * prec^{erodexp} </m> | <m> erodedSed = 1000. * ({slope / 5})^{erodslope} * erodluse * erodsoil * {EI/erodindex} * prec^{erodexp} </m> | ||
| - | The parameters //erodslope//, //erodexp// and //erodindex// are general. The parameters //erodluse// and //erodsoil// are land-use and soil type dependent. //slope// is the subbasins average slope, and //EI// its erosion index. | + | The parameters //erodslope//, //erodexp// and //erodindex// are general. The parameters //erodluse// and //erodsoil// are land-use and soil type dependent. Subbasin input is needed on //slope//, the subbasins average slope, and an erosion index, //EI//. |
| A selective process is affecting the soil erosion of phosphorus. Smaller and lighter particles are eroded easier than larger ones. The tiny particles contain more P per unit weight than the average particle of the soil. Therefore an enrichment factor (//enrichment//) is used. | A selective process is affecting the soil erosion of phosphorus. Smaller and lighter particles are eroded easier than larger ones. The tiny particles contain more P per unit weight than the average particle of the soil. Therefore an enrichment factor (//enrichment//) is used. | ||
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| ===== Nutrient soil leakage from outer source ===== | ===== Nutrient soil leakage from outer source ===== | ||
| - | There is a model option to skip calculating nutrients with HYPE and instead use nutrient soil leakage from an outer source. In this case the calculations above is skipped, while soil water and runoff processes is calculated as usual. The nutrient concentration of total runoff (HYPE variable ID ''crun'') is set, and then used for all further calculations in the streams and lakes. | + | There is a model option to skip calculating nutrients with HYPE and instead use nutrient soil leakage from an outer source. In this case the calculations above is skipped, while soil water and runoff processes is calculated as usual. HYPE output variables related to soil nutrients are set to missing values. |
| - | HYPE output variables related to soil nutrients are set to missing values. | + | The first implemented soil leakage model was |
| - | + | ||
| - | The soil leakage is introduced into the model as inorganic and organic nitrogen, and soluble reactive phosphorus and particulate phosphorus concentrations of the total runoff. Different possibilities exist on how to introduce these regarding time variations (montly seasonal variation, daily), spatial variations (subbasin, regions) and land use dependence (class groups). So far the only implemented alternative is | + | |
| 1. montly seasonal variation of concentrations for each subbasin | 1. montly seasonal variation of concentrations for each subbasin | ||
| - | while the default is | + | The soil leakage is introduced into the model as inorganic and organic nitrogen, and soluble reactive phosphorus and particulate phosphorus concentrations of the total runoff. Different possibilities exist on how to introduce these regarding time variations (montly seasonal variation, daily), spatial variations (subbasin, regions) and land use dependence (class groups). So far the only implemented alternative is the monthly seasonal variation. |
| + | |||
| + | The nutrient concentration of total runoff (HYPE variable ID ''crun'') is set, and then used for all further calculations in the streams and lakes. | ||
| - | 0. use HYPE calculated runoff concentrations. | + | The default is to use HYPE calculated runoff concentrations with the processes described above (''modeloption soilleakage 0''). |
start/hype_model_description/hype_np_soil.txt · Last modified: 2024/04/16 09:10 by cpers
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