This shows you the differences between two versions of the page.
Both sides previous revision Previous revision | Next revision Both sides next revision | ||
start:hype_model_description:hype_np_soil [2018/11/13 16:07] cpers [Soil erosion] |
start:hype_model_description:hype_np_soil [2018/11/13 17:54] cpers [Soil erosion] |
||
---|---|---|---|
Line 157: | Line 157: | ||
<m> erodedP = 0.000001 * erodedSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> | <m> erodedP = 0.000001 * erodedSed * {{PartP + HumusP}/ {thickness * bulkdensity}} * enrichment </m> | ||
- | | + | |
- | A certain proportion 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//). | + | 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. |
+ | |||
+ | 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//). | ||
<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 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 (//transPP//) by surface runoff and macropore flow is collected in a temporary storage pool (//PPrelpool// (kg/km2)) together with PP in tile runoff (//tilePP//). | + | 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//). |
- | <m> transPP = (srfilt*sflow+macrofilt*mflow)*erodedP/eflow </m> | + | <m> transp = (srfilt*sflow+macrofilt*mflow)*erodedSed/eflow </m> or |
+ | <m> transp = (srfilt*sflow+macrofilt*mflow)*erodedP/eflow </m> | ||
<m> eflow=sflow+mflow </m> | <m> eflow=sflow+mflow </m> | ||
- | <m> PPrelpool = PPrelpool + transPP + tilePP </m> \\ | + | <m> relpool = relpool + transp + tilep </m> \\ |
- | From the temporary pool phosphorus is released (//PPrel// (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 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. |
- | <m> PPrel = MIN(PPrelpool, PPrelpool *(runoff {/} pprelmax)^{pprelexp}) </m> | + | <m> release = MIN(relpool, relpool *(runoff {/} pprelmax)^{pprelexp}) </m> |
==== Crop cover and ground cover ==== | ==== Crop cover and ground cover ==== |