~ ~ ~ PURPOSE ~ ~ ~
this subroutine computes HRU loadings of chlorophyll-a, CBOD,
and dissolved oxygen to the main channel
~ ~ ~ INCOMING VARIABLES ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
enratio |none |enrichment ratio calculated for day in HRU
hru_km(:) |km^2 |area of HRU in square kilometers
sedorgn(:) |kg N/ha |amount of organic nitrogen in surface runoff
|in HRU for the day
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ OUTGOING VARIABLES ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
cbodu(:) |mg/L |carbonaceous biological oxygen demand of
|surface runoff on current day in HRU
chl_a(:) |microgram/L |chlorophyll-a concentration in water yield
|on current day in HRU
doxq(:) |mg/L |dissolved oxygen concentration in the surface
|runoff on current day in HRU
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
Intrinsic: Exp
~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
calculcate water temperature Stefan and Preudhomme. 1993. Stream temperature estimation from air temperature. Water Res. Bull. p. 27-45 SWAT manual 2.3.13 deg C to deg K
calculate organic carbon loading to main channel add by zhang ======================== add by zhang ========================
calculate carbonaceous biological oxygen demand (ppm or mg/L) calculate dissolved oxygen saturation concentration QUAL2E equation III-29 calculate actual dissolved oxygen concentration