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start:hype_model_description:hype_np_riv_lake [2020/04/30 09:11] cpers [Primary production and mineralization] |
start:hype_model_description:hype_np_riv_lake [2020/12/02 15:23] cpers [Macrophyte uptake] |
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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 rivers and 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> | ||
- | The lake area (//fracarea//) that is shallower than a production depth (//proddep//, general parameter //muptdep//) is assumed to be active with macrophyte uptake. The lake is for this purpose assumed to be decreasing linearly with depth until twice the average depth of the lake. | + | The bottomarea (//fracarea//) that is shallower than a production depth (//proddep// set by general parameters) is assumed to be active with macrophyte uptake. The river or lake are for this purpose assumed to be decreasing linearly with depth until twice the average depth. |
<m> fracarea = {proddep / (2*vol/area)} * area </m> | <m> fracarea = {proddep / (2*vol/area)} * area </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. 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 ==== |