start:hype_model_description:hype_np_riv_lake
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start:hype_model_description:hype_np_riv_lake [2020/04/30 09:09] cpers [Denitrification] |
start:hype_model_description:hype_np_riv_lake [2020/04/30 09:12] cpers [Macrophyte uptake] |
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| <m> TPfcn = {TP-lim} / {(TP-lim) + hsatTP} </m> | <m> TPfcn = {TP-lim} / {(TP-lim) + hsatTP} </m> | ||
| - | For lakes, the process is acting only in lake part SLP, while the processes are active throughout the watercourse volume. The estimated production/mineralization (//minprodNpot//, kg / day) is the potential transformation, and may be limited by the availability of nutrients. Only 50% of the available IN the pool (at the primary production) or 50% of the ON-pool (for mineralization) can be transformed. The potential phosphorus conversion (//minprodPpot//) is calculated in the same way, but with its own parameter (//wprodp//) and a factor for phosphorus/nitrogen ratio (//NPratio// = 1/7.2). Similarly, there is a restriction against transforming maximum 50% of the SP and PP pools. The parameters //wprodn// and //wprodp// is generic or can be specified for each lake. The area is equal to lake area for lakes and bottom area for rivers (width multiplied by the length of the watercourse, see [[start:hype_model_description:hype_np_riv_lake#basic_assumptions|Basic assumptions]], or if the river is a class, the class' area). The water depth (//depth//) is the SLP lake part, and for the river the depth calculated [[start:hype_model_description:hype_np_riv_lake#basic_assumptions|above]]. | + | The estimated production/mineralization (//minprodNpot//, kg / day) is the potential transformation, and may be limited by the availability of nutrients. Only 50% of the available IN the pool (at the primary production) or 50% of the ON-pool (for mineralization) can be transformed. The potential phosphorus conversion (//minprodPpot//) is calculated in the same way, but with its own parameter (//wprodp//) and a factor for phosphorus/nitrogen ratio (//NPratio// = 1/7.2). Similarly, there is a restriction against transforming maximum 50% of the SP and PP pools. The parameters //wprodn// and //wprodp// is generic or can be specified for each lake. The area is equal to lake area for lakes and bottom area for rivers (width multiplied by the length of the watercourse, see [[start:hype_model_description:hype_np_riv_lake#basic_assumptions|Basic assumptions]], or if the river is a class, the class' area). The water depth (//depth//) is the SLP lake part, and for the river the depth calculated [[start:hype_model_description:hype_np_riv_lake#basic_assumptions|above]]. |
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| =====Macrophyte uptake===== | =====Macrophyte uptake===== | ||
| - | For shallow waters in lakes macrophytes can grow and take up inorganic nutrients (IN and SP). The nutrients are lost to the model. Macrophyte uptake are controlled by a temperature function (//tmpfcn//) and a concentration function (//TPfcn//) for total phosphorus. The temperature function is composed of two parts; one exponential and one dependent on the water temperature (//Tw//) above the average temperature of the last twenty days (//T20//). The concentration function is the same half-saturation function as for production and mineralisation [[http://www.smhi.net/hype/wiki/doku.php?id=start:hype_model_description:hype_np_riv_lake#primary_production_and_mineralization|above]]. | + | For shallow waters in lakes macrophytes can grow and take up inorganic nutrients (IN and SP). The nutrients are lost to the model. Macrophyte uptake are controlled by a temperature function (//tmpfcn//) and a concentration function (//TPfcn//) for total phosphorus. The temperature function is composed of two parts; one exponential and one dependent on the water temperature (//Tw//) above the average temperature of the last twenty days (//T20//). The concentration function is the same half-saturation function as for production and mineralisation [[start:hype_model_description:hype_np_riv_lake#primary_production_and_mineralization|above]]. |
| <m> tmpfcn = (Tw/20)^0.3 * (Tw-T20)/5, Tw>0 and tempfcn>0 </m> | <m> tmpfcn = (Tw/20)^0.3 * (Tw-T20)/5, Tw>0 and tempfcn>0 </m> | ||
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| <m> upt = uptpar * tmpfcn * TPfcn * fracarea </m> | <m> upt = uptpar * tmpfcn * TPfcn * fracarea </m> | ||
| - | The uptake rate parameters (//uptpar//), different for IN and SP, are general (//muptn, muptp//). The process is similar to the [[http://www.smhi.net/hype/wiki/doku.php?id=start:hype_model_description:hype_human_water#wetland_nutrient_processes1|modelled macrophyte uptake in wetlands]]. | + | The uptake rate parameters (//uptpar//), different for IN and SP, are general (//muptn, muptp//). The process is similar to the [[start:hype_model_description:hype_human_water#wetland_nutrient_processes1|modelled macrophyte uptake in wetlands]]. |
| ==== Links to file reference ==== | ==== Links to file reference ==== | ||
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