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--- start:hype_model_description:hype_np_riv_lake [2020/02/14 11:20]
cpers [Primary production and mineralization]
+++ start:hype_model_description:hype_np_riv_lake [2020/02/28 11:18]
cpers
@@ Line 197: / Line 197: @@
 |[[http://hype.sourceforge.net/doxy-html/namespacenpc__surfacewater__processes.html|npc_surfacewater_processes (np_sw_proc.f90)]]|np_processes_in_lake |
 |:::|internal_lake_load|
+=====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]].
+tmpfcn = (Tw/20)^0.3 * (Tw-T20)/5, Tw>0 and tempfcn>0
+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.
+<m> fracarea = {proddep / (2*vol/area)} * area </m>
+The uptake (//upt//) is limited to maximum 50% of the available nutrients and the whole equation becomes:
+<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]].
+==== Links to file reference ====
+^Symbol^Parameter/Data	^File ^
+|//uptpar//|//muptn,muptp//|[[start:hype_file_reference:par.txt|par.txt]] or [[start:hype_file_reference:lakedata.txt|LakeData.txt]]|
+|//proddep//|//muptdep//|[[start:hype_file_reference:par.txt|par.txt]]|

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