This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
start:hype_model_description:hype_np_riv_lake [2018/09/10 10:58] cpers [Nitrogen and phosphorus processes in rivers and lakes] |
start:hype_model_description:hype_np_riv_lake [2018/10/02 10:49] cpers [Denitrification] |
||
---|---|---|---|
Line 2: | Line 2: | ||
- | Transformations of nutrients take place in lakes and rivers. For lakes, which are divided into fast (FLP) and slow (SLP) lake parts, the process is performed only in SLP (Fig. 1). For rivers, which hold water in a queue and in the damping box, the processes is performed only in the damping box. | + | Transformations of nutrients take place in lakes and rivers. For lakes, which are divided into fast (FLP) and slow (SLP) lake parts, the process is performed only in SLP (Fig. 1). For rivers, which hold delayed water in a queue and in the damping box, the processes is performed only in the damping box. |
|{{:start:hype_model_description:nutrientflowinlake.png?400|}}| | |{{:start:hype_model_description:nutrientflowinlake.png?400|}}| | ||
Line 35: | Line 35: | ||
===== Denitrification ===== | ===== Denitrification ===== | ||
- | Denitrification, a sink for inorganic nitrogen in lakes and rivers, is a function of the bottom area, the IN concentration (//concfcn//) in water volume, water temperature (//tmpfcn//) and the general parameters //denitwrl// (local river), //denitwrm// (main river) and //denitwl// (lakes). In the concentration function, the half saturation parameter (//hsatINw//) is a general parameter, but it was in earlier HYPE versions a constant equal to 1.5 mg/L. Denitrification (//denitri_water//, //kg/day//) is limited to a maximum of 50% (//maxdenitriwater//) of the available IN pool (i.e. in SLP). | + | Denitrification, a sink for inorganic nitrogen in lakes and rivers, is a function of the bottom area, the IN concentration (//conc//) in water volume, water temperature (<m>T_w</m>) and the general parameters //denitwrl// (local river), //denitwrm// (main river) and //denitwl// (lakes). In the concentration function, the half saturation parameter (//hsatINw//) is a general parameter, but it was in earlier HYPE versions a constant equal to 1.5 mg/L. Denitrification (//denitri_water//, //kg/day//) is limited to a maximum of 50% of the available IN pool (i.e. in SLP). |
+ | |||
+ | <m> tmpfcn=delim{lbrace}{ | ||
+ | matrix{3}{2}{ | ||
+ | 0 {T_w<0} | ||
+ | {T_w/5}*{2^{{T_w-20}/{10}}} {0<T_w<5} | ||
+ | 2^{{T_w-20}/{10}} else | ||
+ | }}{} </m> | ||
+ | |||
+ | <m> concfcn= conc/{conc+hsatINw} </m> | ||
+ | |||
+ | <m> denitri_water = MIN(0.5* INpool,denitw*area*concfcn*tmpfcn) </m> | ||
tmpfcn = 2**((watertemp - 20) / 10) | tmpfcn = 2**((watertemp - 20) / 10) |