Maisbich (Luxemburg) river basin discharge data, sensor Q4, month 2009-08

Parent item: Maisbich (Luxemburg), data from discharge meter Q4 (Qup), 2006-12 and later Measuring instrument: Maisbich basin: V-notch discharge meter Q4 (Qup) Type: Van Essen TD-Driver, SN 19613 This instrument measures pressure with one absolute sensor. It also measures temperature. Height V-notch above sensor: 0.0018m. Datasets with correction contain the corrected discharge observed at the Vnotch. The discharge is calculated as Q=Cd*h^2.5 After correcting the logger measurements with hand measured depths we interpolated the difference (dH) Then we determined the factor Cd with discharge measurements which we also interpolated The timing of hand measurements can be corrected to better represent the logged values The last corrections (variable "clean_corr") were made for blocking of the V-notch weir as folows: z1 represents the last good discharge value after which sedimentation slowly starts blocking the weir z2 represents the moment when the blocking is max z3 represents the moment just before cleaning of the weir z4 represents the moment after cleaning of the weir The max difference in discharge is Q(z3)-Q(z4)

父数据集：迈斯比赫（卢森堡），数据取自2006年12月及以后的Q4（Qup）排放流量计。测量仪器：迈斯比赫堰槽搭载V形堰（V-notch）排放流量计Q4（Qup），型号为Van Essen TD-Driver，序列号（SN）19613。该仪器采用单绝对压力传感器采集压力数据，同时可同步测量温度。传感器上方V形堰高度为0.0018米。经校正的数据集包含V形堰处观测得到的校正后流量，流量计算公式为Q = C_d · h^2.5。我们先以人工实测的水深数据校正数据记录仪的测量结果，随后对差值（dH）进行插值处理；再基于经插值的流量测量数据，计算得到流量系数C_d。可对手动测量的时间戳进行校正，以更精准匹配数据记录仪的记录数据。最后一项校正（变量名为"clean_corr"）针对V形堰的堵塞情况开展，校正逻辑如下：z1代表最后一组合格的流量数据，此后淤积逐步开始堵塞堰槽；z2代表堰槽堵塞程度达到峰值的时刻；z3代表堰槽清理前的瞬时时刻；z4代表堰槽清理完成后的瞬时时刻。流量的最大偏差为Q(z3) - Q(z4)。