自记与自动观测降雨量的差异及相关分析

Difference and Correlativity Analysis between Automatic and Self-Recording Observation Rainfall

利用2004—2007年同时使用雨量计(自记)与雨量传感器(自动)观测的54站其中1年的平行观测日降雨量资料,通过对比差值、相关系数分析两者的差异及相关性。结果表明:双翻斗式遥测雨量计自记观测比双翻斗雨量传感器自动观测的日降雨量平均偏小0.12 mm,标准差为0.93 mm。虹吸式雨量计自记观测比双翻斗雨量传感器自动观测的日降雨量平均偏小0.39 mm,标准差为1.5 mm。自动观测降雨量对雨日有一定的影响,两者存在一定的系统偏差。双翻斗式遥测雨量计、虹吸式雨量计与双翻斗雨量传感器观测日降雨量的相关系数分别为0.996和0.994,虹吸式雨量计、双翻斗式遥测雨量计自记观测与人工观测降雨量的相关系数分别为0.98和0.95。

The data of daily rainfall from 54 weather stations in 2004,2005,2007 are used to analyze the difference and correlativity between automatic and self-recording observation rainfall.Results indicate that the average daily rain amount observed by dual tipping-bucket pluviographs is 0.12 mm less than those by the automatic observation,with the standard deviation of the difference being 0.93 mm;the average daily rain amount observed by hydrocone-type pluviographs is 0.39 mm less than the automatic observation,with the standard deviation of the difference being 1.5 mm.The application of the automatic rain sensors has certain influence on the statistical results of rainy days.The daily rain amount observed by the self-recording observation is obviously linearly related to that by the automatic observation.The correlation coefficient of daily rainfall measurements by the tipping bucket pluviograph and the automatic rain sensor is 0.996 and the correlation coefficient of daily rainfall measurements by hydrocone type pluviograph and the automatic rain sensor is 0.994.The self-recording rainfall also is obviously linearly related to the manual observation.