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start:hype_model_description:hype_np_soil [2019/12/19 16:44] cpers [Soil erosion] |
start:hype_model_description:hype_np_soil [2019/12/19 16:49] cpers [Soil erosion] |
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- | Eventually the eroded PP (kg/km2) is calculated as: | + | Eventually the mobilised PP (kg/km2) is calculated as: |
<m> mobilP = 0.000001 * mobilSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> | <m> mobilP = 0.000001 * mobilSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> | ||
- | 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. | + | The calculated mobilised phosphorus (//mobilP//) is now available to add to the 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 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//). |
<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 (//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//). | + | Similarly, part of the 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 PP transported (//erodedP//) by surface runoff and macropore flow is collected in a temporary storage pool (//relpool// (kg/km2)) together with PP in tile runoff (//tilep//). |
- | <m> erodedSed = (srfilt*sflow+macrofilt*mflow)*mobilSed/eflow </m> or | + | <m> erodedP = (srfilt*sflow+macrofilt*mflow)*mobilP/eflow </m> |
- | <m> erodedSed = (srfilt*sflow+macrofilt*mflow)*mobilP/eflow </m> | + | |
<m> eflow=sflow+mflow </m> | <m> eflow=sflow+mflow </m> | ||
- | <m> relpool = relpool + transp + tilep </m> \\ | + | <m> relpool = relpool + erodedP + tilep </m> \\ |
- | From the temporary pool sediment and phosphorus is released (//release// (kg/km2)) and then transported to the local river depending on the size of the total runoff (//runoff// (mm)). The parameters //pprelmax// and //pprelexp// are general. | + | From the temporary pool phosphorus is released (//release// (kg/km2)) and then transported to the local river depending on the size of the total runoff (//runoff// (mm)). The parameters //pprelmax// and //pprelexp// are general. |
<m> release = MIN(relpool, relpool *(runoff {/} pprelmax)^{pprelexp}) </m> | <m> release = MIN(relpool, relpool *(runoff {/} pprelmax)^{pprelexp}) </m> |