actual rain sensor dry out times compared to …...actual rain sensor dry out times compared to...
TRANSCRIPT
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Actual rain sensor dry out times compared to
estimated soil dry out times
Bernard Cardenas and Michael D. DukesABE Dept., University of Florida
2018 Urban Landscape Summit Gainesville, FL March 14, 2018
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Rain Sensor (RS)
•RS can bypass the timersettings, when therehas been sufficient rain.
Timer
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QuestionDo the RS dry out periods match the soil dry outperiods?
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OBJECTIVESa) Determine the dry out periods of 2 RSsb) Estimate the dry out periods of 3 soil textures
through a soil water balance modelc) Compare a) vs b)
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MATERIALS AND METHODSLocation: On campus, UF,
Gainesville, FL
Data collection period:Jan 1 – Dec 31, 2007
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Hunter RainClik
Receivers
MUX
Datalogger
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Emitters
Receivers
MUX
Datalogger
Toro TWRS
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Weather Station
Tipping bucket
Data logger
(0.25 mm)
(m/d h:m:s)
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Weather Station
Weather data
Software Ref ET
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WAVE to simulate hourly soil water balance
Clay Loam
Loam
Sand
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WAVE to simulate hourly soil water balance
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RESULTS AND DISCUSSION
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Standard error bars
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Standard error bars
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Standard error bars
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CONCLUSIONS• The dry out periods of the tested RSs were shorter
than those of the different soil types modeled
• RSs: limited usefulness under Florida conditions
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Time Rain(hh:mm) (mm)
18:00 1.519:00 0.320:00 0.321:00 1.322:00 1.323:00 1.3Total 5.8
No runoff
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Infiltration = 27%
Infiltration = 39%
Infiltration = 100%
Time Rain(hh:mm) (mm)
11:00 14.212:00 0.313:0014:00 7.915:0016:0017:00 14.7Total 37.1
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Time Rain(hh:mm) (mm)
18:00 1.519:00 0.320:00 0.321:00 1.322:00 1.323:00 1.3Total 5.8
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Expanding Disks
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Wireless RainClick
Expanding Disks
Antenna
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Common
WaterValve
Timer
Hot
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Common
WaterValve
Timer
Hot