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start:hype_model_description:hype_orgc [2018/10/11 14:18]
cpers [Turnover of humusC]
start:hype_model_description:hype_orgc [2018/10/12 14:03] (current)
cpers [Links to file reference]
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 ===== Riparian zone ===== ===== Riparian zone =====
  
-Runoff from soil layers ​may flows through a riparian zone before it reaches the local river. Surface runoff and drainage water from drainage pipes reaches the local river without passing through the riparian zone.+Runoff from soil may flows through a riparian zone before it reaches the local river. Surface runoff and drainage water from drainage pipes reaches the local river without passing through the riparian zone.
 In the riparian zone the levels of OC are affected, while flows remain unchanged. The change depends on soil temperature,​ class altitude (//elev// (in masl)), the water table (//gwat//) and its recent change, season and soil moisture (//sm//). The runoff concentration (//​conc(i)//​) of each soillayer (//k//) increases with the factor: In the riparian zone the levels of OC are affected, while flows remain unchanged. The change depends on soil temperature,​ class altitude (//elev// (in masl)), the water table (//gwat//) and its recent change, season and soil moisture (//sm//). The runoff concentration (//​conc(i)//​) of each soillayer (//k//) increases with the factor:
  
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    }{} </m>    }{} </m>
   ​   ​
-The activation of riparian zone processes is based on land use. The land use dependent parameter //ripz// determines the overall level of increase in concentration in the riparian zone, and if set to zero no riparian zone processes are used. In addition two general parameters can influence the effect of the riparian processes; //ripe// which determines the groundwater level dependence, and //rips// which determines the seasonal influence. Season division is determined by ten-day and twenty-day averages of air temperature (T10, T20). Autumn is defined as the period when T10 is less than T20. The soil moisture function is different for an increasing (rising) and sinking ground water table (figure 2). It contains coefficients <​m>​\Theta_{upp} = 0.12</​m>,​ <​m>​\Theta_{low} = 0.08</​m>​ and saturation (//satact// = 0.6). It depends on the soil moisture of all layers together (//sm//) and the water-holding capacity parameters; //wp// - wilting border and //pw// - total pore volume, in fractions of total soil layer thickness (//d//).+The activation of riparian zone processes is based on land use. It is primarily though to act on forest runoff. The land use dependent parameter //ripz// determines the overall level of increase in concentration in the riparian zone, and if set to zero no riparian zone processes are used. In addition two general parameters can influence the effect of the riparian processes; //ripe// which determines the groundwater level dependence, and //rips// which determines the seasonal influence. Season division is determined by ten-day and twenty-day averages of air temperature (T10, T20). Autumn is defined as the period when T10 is less than T20. The soil moisture function is different for an increasing (rising) and sinking ground water table (figure 2). It contains coefficients <​m>​\Theta_{upp} = 0.12</​m>,​ <​m>​\Theta_{low} = 0.08</​m>​ and saturation (//satact// = 0.6). It depends on the soil moisture of all layers together (//sm//) and the water-holding capacity parameters; //wp// - wilting border and //pw// - total pore volume, in fractions of total soil layer thickness (//d//).
    
  
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-Primary production is a source of organic carbon in rivers and lakes, while mineralization is a sink. Primary production and mineralization is calculated the same way as for nitrogen, but with its own calibration parameter (//​wprodc//​). The potential carbon transformation (//​minprodCpot//,​ kg / day) is proportional to the potential nitrogen transformation (//​minprodNpot//,​ see [[start:​hype_model_description:​hype_np_riv_lake#​primary_production_and_mineralization|NP section]]) with a transformation rate that depends on the carbon-nitrogen ratio (//​NCratio//​ = 5.7). The calculated mineralization of organic carbon is limited to a maximum of 50% of the available OC pool. If phosphorus is not modelled a long-term average total phosphorus concentration as a lake region dependent parameter (//​tpmean//​) is used. If set, the long-term average concentration is reduced by the general parameter //​limsedPP//​ before using it in the concentration function.+Primary production is a source of organic carbon in rivers and lakes, while mineralization is a sink. Primary production and mineralization is calculated the same way as for nitrogen, but with its own calibration parameter (//wprodc//). The equations are repeated below. The production/​mineralization depend on temperature and total phosphorus and lake area (//area//). The potential carbon transformation (//​minprodCpot//,​ kg / day) is proportional to the potential nitrogen transformation (//​minprodNpot//,​ see also  ​[[start:​hype_model_description:​hype_np_riv_lake#​primary_production_and_mineralization|NP section]]) with a transformation rate that depends on the carbon-nitrogen ratio (//​NCratio//​ = 5.7). The calculated mineralization of organic carbon is limited to a maximum of 50% of the available OC pool. If phosphorus is not modelled a long-term average total phosphorus concentration as a lake region dependent parameter (//​tpmean//​) is used. If set, the long-term average concentration is reduced by the general parameter //​limsedPP//​ before using it in the concentration function ​thus reducing the production/​mineralisation of OC.
  
 <m> tmpfcn1 = watertemp / 20. </m> <m> tmpfcn1 = watertemp / 20. </m>
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 ==== Sedimentation ==== ==== Sedimentation ====
  
-Sedimentation in lakes is a sink for OC and works the same way as for organic nitrogen and particulate phosphorus. Sedimentation (//sedOC//, //kg/day//) is calculated as a function of water concentration and lake area (//area//). The parameter //sedoc// is general or can be specified for each lake.+Sedimentation in lakes is a sink for OC and works the same way as for organic nitrogen and particulate phosphorus. Sedimentation (//sedOC//, //kg/day//) is calculated as a function of OC concentration ​in lake water (//​conc//​)) ​and lake area (//area//). The settling velocity ​parameter //sedoc// is general or can be specified for each lake.
  
-<m> sedOC = sedoc * waterconcOC ​* area </​m> ​  +<m> sedOC = sedoc * conc * area </​m> ​  
  
 ==== Links to relevant procedures in the code ==== ==== Links to relevant procedures in the code ====
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 |Sources of organic material| |//​resc//​|[[start:​hype_file_reference:​cropdata.txt|CropData.txt]]| |Sources of organic material| |//​resc//​|[[start:​hype_file_reference:​cropdata.txt|CropData.txt]]|
 |:::| |//​litterdays//​|[[start:​hype_file_reference:​par.txt|par.txt]]| |:::| |//​litterdays//​|[[start:​hype_file_reference:​par.txt|par.txt]]|
-|Soil processes| |//humusc1////humusc2////humusc3////fastc1////fastc2////fastc3//​|[[start:​hype_file_reference:​par.txt|par.txt]]|+|Soil processes| |//humusc1, humusc2, humusc3, fastc1, fastc2, fastc3, koflim//​|[[start:​hype_file_reference:​par.txt|par.txt]]|
 |:::​|<​m>​theta_low</​m>​ |//​ocsoilslp//​ or 0.08|:::| |:::​|<​m>​theta_low</​m>​ |//​ocsoilslp//​ or 0.08|:::|
 |:::​|//​satact//​|//​ocsoilsat//​ or 0.6|:::| |:::​|//​satact//​|//​ocsoilsat//​ or 0.6|:::|
-|:::|//minc////klh////klo////kof////kho//​|//​minc////klh////klo////kof////kho//|:::| +|:::​|//​minc,​ klh, klo, kof, kho//​|//​minc,​ klh, klo, kof, kho//|:::|
-|:::| |//koflim//|:::|+
 |:::​|//​par//​|//​kcgwreg//​ or //​koc//​|:::​| |:::​|//​par//​|//​kcgwreg//​ or //​koc//​|:::​|
 |Riparian zone|//​elev//​|calculated from //​mean_elev//​ and //​dhslc_nn//​|[[start:​hype_file_reference:​geodata.txt|GeoData.txt]]| |Riparian zone|//​elev//​|calculated from //​mean_elev//​ and //​dhslc_nn//​|[[start:​hype_file_reference:​geodata.txt|GeoData.txt]]|
start/hype_model_description/hype_orgc.1539260306.txt.gz · Last modified: 2018/10/11 14:18 by cpers