翻斗式雨量计左右斗平衡判别方法

Judgement method for left and right bucket balance of tipping bucket raingauge

为了判别TBR左右斗平衡,提出了差值判别法和差值率判别法。差值判别法以左右斗平均每斗水量的差值为判别指标,并记α为差值限;差值率判别法以左右斗差值的绝对值与左右斗测量值的平均值之比作为判别指标,并记β为差值率限。以JDZ05和JDZ10两款TBR开展实验分析,结果表明:1)对于JDZ05,α可取0.1 g,β可取1%;对于JDZ10,α可取0.2 g,β可取1%。2)左右斗不平衡时,不利于JDZ05和JDZ10监测的雨量范围分别为0~5.5 mm和0~19 mm;经过左右斗调平后,不利于JDZ05和JDZ10监测的雨量范围分别为0~3.5 mm和0~7 mm。3)经过左右斗调平后,可减少左右斗差值、左右斗差值率和计量误差的离散程度,提高计量误差的重复性,有助于提高测量降雨的准确度。研究成果可对制定TBR左右斗平衡判别准则和改进翻斗式雨量计率定流程提供参考。

In order to judge the balance between the left and right buckets of the TBR,the difference judgement method and the difference rate judgement method are proposed.The difference judgement method uses the difference between the average water weights of the left and right buckets as the criterion,and letαbe the difference limit.The difference rate judgement method uses the ratio of the absolute value of the difference between the left and right buckets to the average of left and right bucket measurements as the judgement criterion,and letβbe the difference rate limit.The experiment analysis on the two TBRs of JDZ05 and JDZ10 was carried out.The results show that:1)For JDZ05,αmay take 0.1 g,βmay take 1%;for JDZ10,αmay take 0.2 g,βmay take 1%.2)When the left and right buckets are unbalanced,the rainfall ranges that are not conducive to JDZ05 and JDZ10 monitoring are 0~5.5 mm and 0~19 mm,respectively;after balancing the left and right buckets,the rainfall ranges unfavorable for JDZ05 and JDZ10 monitoring are 0~3.5 mm and 0~7 mm,respectively.3)After balancing the left and right buckets,the difference value,the difference value rate of the left and right buckets and the dispersion of the measurement errors can be reduced,the repeatability of the measurement error can be improved,which is helpful to improve the accuracy of the rainfall measurement.The research results can provide a reference for developing TBR bucket balance judgement method and improving TBR calibration process.