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start:hype_model_description:hype_np_riv_lake

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start:hype_model_description:hype_np_riv_lake [2018/11/16 15:46]
cpers [Basic assumptions]
start:hype_model_description:hype_np_riv_lake [2019/09/30 10:07] (current)
cpers [Sedimentation/Resuspension]
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 ===== Primary production and mineralization ===== ===== Primary production and mineralization =====
  
-Primary production in lakes and rivers is a source of organic nitrogen and particulate phosphorus and a sink for inorganic nitrogen and soluble reactive phosphorus in the model. The reverse is true for mineralization. The processes ​is modelled together and only one is active at the time. Primary production and mineralization are controlled by two temperature functions. The first (//​tmpfcn1//​) is solely dependent on the water temperature (//​T<​sub>​w</​sub>//​). It simulates the increased activity at warmer temperatures. The second (//​tmpfcn2//​) governs the relationship between primary production and mineralization and determines which one dominates. Net primary production is highest in spring (northern hemisphere) and changes into net mineralization when the temperature //T10// is less than the temperature //T20// in autumn. These two temperatures are calculated as the average water temperature of 10 and 20 days. +Primary production in lakes and rivers is a source of organic nitrogen and particulate phosphorus and a sink for inorganic nitrogen and soluble reactive phosphorus in the model. The reverse is true for mineralization. The processes ​are modelled together and only one is active at the time. Primary production and mineralization are controlled by two temperature functions. The first (//​tmpfcn1//​) is solely dependent on the water temperature (//​T<​sub>​w</​sub>//​). It simulates the increased activity at warmer temperatures. The second (//​tmpfcn2//​) governs the relationship between primary production and mineralization and determines which one dominates. Net primary production is highest in spring (northern hemisphere) and changes into net mineralization when the temperature //T10// is less than the temperature //T20// in autumn. These two temperatures are calculated as the average water temperature of 10 and 20 days. 
  
  
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 ===== Sedimentation/​Resuspension ===== ===== Sedimentation/​Resuspension =====
  
-Sedimentation in lakes is a sink for particulate phosphorus (PP) and organic nitrogen (ON), as well as for suspended sediments (SS) and algae (AE). Sedimentation (//sed//, //m/day//) is calculated as a function of concentration (//conc//) in the lake and lake area (//area//). The sedimentation rate (//​par<​sub>​sed</​sub>//​) is given by parameters (//sedon//, //sedpp//, //sedss//, //sedae//) which are generic, but ON and PP sedimentation can be specified for each lake. The concentration used in the equation may be limited (//lim//) by general parameters (//​limsedON//,​ //​limsedPP//,​ //​limsedSS//​),​ but not for AE (//​lim//​=0).+Sedimentation in lakes is a sink for particulate phosphorus (PP) and organic nitrogen (ON), as well as for suspended sediments (SS) and algae (AE). Sedimentation (//sed//, //kg/day//) is calculated as a function of concentration (//conc//) in the lake and lake area (//area//). The sedimentation rate (//​par<​sub>​sed</​sub>//​) is given by parameters (//sedon//, //sedpp//, //sedss//, //sedae//) which are generic, but ON and PP sedimentation can be specified for each lake. The concentration used in the equation may be limited (//lim//) by general parameters (//​limsedON//,​ //​limsedPP//,​ //​limsedSS//​),​ but not for AE (//​lim//​=0).
  
 <m> sed = par_sed * (conc-lim) * area </m> <m> sed = par_sed * (conc-lim) * area </m>
start/hype_model_description/hype_np_riv_lake.1542379583.txt.gz ยท Last modified: 2018/11/16 15:46 by cpers