Analysis of Measurement Errors of Double Tipping Raingauges
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Abstract:
The measurement errors of SL3 type double tipping rainguage due to the coordination problem are analyzed through a precipitation simulation experiment. The results show: The improperly adjusted capacity of uptipping but proper capacity of downtipping make precipitation loss increase, leading to small measurement value because of the coordination problem of up and down tipping. For example, when rainfall intensity is 1 mm/min and the capacity of right up tipping is less 0.4 mL, the precipitation measurement error is -4%. In contrast, proper up tipping but improper down tipping brings the greater measurement error. When rainfall intensity is 1 mm/min and the capacity of right down tipping less 0.4 mL, the precipitation measurement error is +11%. Sometimes, the measurement error of improperly adjusted capacity of both tipping is smaller than that of one improper and the other proper. Meanwhile, the design of double tipping raingauge cannot completely solve the problem of measurement error induced by different precipitation rates, but can reduce the error obviously. The maximum deviation of precipitation measurement is 2% in the 4 mm/min and 1 mm/min condition. The solution of using siphon principle equipment to replace the up tipping is proposed, to reduce the effect of manual adjustment.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.