start:hype_model_description:hype_np_soil
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start:hype_model_description:hype_np_soil [2019/05/09 08:28] cpers [Crop cover and ground cover] |
start:hype_model_description:hype_np_soil [2019/12/19 16:44] cpers [Soil erosion] |
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| <m> MobilisedSR = {{(sflow*365)^{sreroexp}} * (1-common_{groundcover}) * {1/{0.5*soilcoh}} * sin(slope/100)} / 365 </m> | <m> MobilisedSR = {{(sflow*365)^{sreroexp}} * (1-common_{groundcover}) * {1/{0.5*soilcoh}} * sin(slope/100)} / 365 </m> | ||
| - | All mobilized particles is not removed from the field, because sometimes the transport capacity of the particle-bearing water (//eflow//) will not suffice for the task. A //transportfactor// will reduce the particle amount: | + | All mobilised particles is not removed from the field, because sometimes the transport capacity of the particle-bearing water (//eflow//) will not suffice for the task. A //transportfactor// will reduce the particle amount: |
| <m> transportfactor = MIN(1.0,(eflow {/} 4)^{1.3}) </m> | <m> transportfactor = MIN(1.0,(eflow {/} 4)^{1.3}) </m> | ||
| - | Eroded sediment (kg/km2) is calculated as: | + | Mobilised sediment (kg/km2) is calculated as: |
| - | <m> erodedSed = 1000 * (MobilisedRain + MobilisedSR) * transportfactor </m> | + | <m> mobilSed = 1000 * (MobilisedRain + MobilisedSR) * 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 and subbasin input data. | + | The alternative erosion model calculates mobilised sediment (//mobilSed// (kg/km2)) based on rainfall (//rain//) and a number of model parameters and subbasin input data. |
| - | <m> erodedSed = 1000. * ({slope / 5})^{erodslope} * erodluse * erodsoil * {EI/erodindex} * prec^{erodexp} </m> | + | <m> mobilSed = 1000. * ({slope / 5})^{erodslope} * erodluse * erodsoil * {EI/erodindex} * rain^{erodexp} </m> |
| 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//. | 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//. | ||
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| Eventually the eroded PP (kg/km2) is calculated as: | Eventually the eroded PP (kg/km2) is calculated as: | ||
| - | <m> erodedP = 0.000001 * erodedSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> | + | <m> mobilP = 0.000001 * mobilSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> |
| - | The calculated eroded sediment (//erodedSed//) and eroded phosphorus (//erodedP//) are now available to add to the suspended sediment (SS) or particulate phosphorus (PP) of surface runoff. | + | The calculated mobilised sediment (//mobilSed//) and phosphorus (//mobilP//) are now available to add to the suspended sediment (SS) or particulate phosphorus (PP) of surface runoff. |
| A portion of SS and PP in surface runoff (//sflow//) is filtered out (for example by buffer zones). Filtering (//srfilt//) is determined by land use dependent parameters (//bufferfilt, innerfilt, otherfilt//), percentage of agricultural land close to a watercourse (//alfa//), and proportion of agricultural land near the rivers which have a protective buffer zone (//bufferpart//). | A portion of SS and PP in surface runoff (//sflow//) is filtered out (for example by buffer zones). Filtering (//srfilt//) is determined by land use dependent parameters (//bufferfilt, innerfilt, otherfilt//), percentage of agricultural land close to a watercourse (//alfa//), and proportion of agricultural land near the rivers which have a protective buffer zone (//bufferpart//). | ||
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| <m> srfilt = otherfilt + alfa * (1. + bufferpart * (bufferfilt - 1.)) + innerfilt * (1. - alfa) </m> | <m> srfilt = otherfilt + alfa * (1. + bufferpart * (bufferfilt - 1.)) + innerfilt * (1. - alfa) </m> | ||
| - | Similarly, part of the SS and PP which is transported by macropore flow (//mflow//) is filtered away between the soil surface and drainage pipes. The parameter that determines this effect (//macrofilt//) is soil dependent. The SS or PP transported (//transp//) by surface runoff and macropore flow is collected in a temporary storage pool (//relpool// (kg/km2)) together with SS and PP in tile runoff (//tilep//). | + | Similarly, part of the SS and PP which is transported by macropore flow (//mflow//) is filtered away between the soil surface and drainage pipes. The parameter that determines this effect (//macrofilt//) is soil dependent. The SS or PP transported (//mobilSed//) by surface runoff and macropore flow is collected in a temporary storage pool (//relpool// (kg/km2)) together with SS and PP in tile runoff (//tilep//). |
| - | <m> transp = (srfilt*sflow+macrofilt*mflow)*erodedSed/eflow </m> or | + | <m> erodedSed = (srfilt*sflow+macrofilt*mflow)*mobilSed/eflow </m> or |
| - | <m> transp = (srfilt*sflow+macrofilt*mflow)*erodedP/eflow </m> | + | <m> erodedSed = (srfilt*sflow+macrofilt*mflow)*mobilP/eflow </m> |
| <m> eflow=sflow+mflow </m> | <m> eflow=sflow+mflow </m> | ||
start/hype_model_description/hype_np_soil.txt · Last modified: 2024/04/16 09:10 by cpers
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