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44 lines
1.0 KiB
Plaintext
44 lines
1.0 KiB
Plaintext
5 years ago
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SUBROUTINE DIEOFFS(TOFDAY,DAYOFY,DELT,T90)
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C Calculates faecal coliform dieoff T90 based on solar radiation during
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C the time interval DELT(sec).
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C Input Time of day (hrs) TOFDAY, Day of year (1-366) DAYOFY.
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C Output T90 (hrs)
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REAL TOFDAY,DAYOFY,LAT,LONG,ELEVAT,DELT,DELTH,STANM
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REAL TSOLHR,T90
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COMMON/INPUTS/LAT,LONG,ELEVAT,STANM
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COMMON/MET/WETBLB,ATMPR,DRYBLB,CLOUD,DAT
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LAT=-33.8
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LONG=151.3
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ELEVAT=0.0 ! Elevation (m)
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DELTH=DELT/3600.
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STANM=150.0 ! Longitude corresponding to standard time
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WETBLB=20.0 ! Dry bulb temp
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DRYBLB=17.5 ! Wet bulb temp (depends on humidity)
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CLOUD=0.0 ! Cloud cover (0-1)
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ATMPR=1015. ! Atm pressure
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DAT=0.07 ! Dust attenuation
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C Dieoff-Solar Radiation Parameters
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C Ref. Caldwell-Connell Engineers (1980) Fig. 7.6
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A=3.3
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B=-0.7
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CALL HEATEX(TOFDAY,DAYOFY,DELT,TSOLHR)
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C Convert radiation in DELT to hourly solar radiation in MJ/m2
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TSOLHR=TSOLHR/1000./DELTH
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C PRINT*,TSOLHR
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C Calculate the T90
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IF (TSOLHR.LT.0.08) THEN
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T90=20.
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ELSE
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T90=A*(TSOLHR**(B))
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ENDIF
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RETURN
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END
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