Maisbich (Luxemburg) river basin discharge data, sensor Q4, month 2009-12

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)

关联父数据集项：卢森堡迈斯比奇（Maisbich）站点，数据取自Q4（Qup）式流量计，时间范围为2006年12月及以后。
测量仪器：迈斯比奇流域配套V形槽流量计Q4（Qup），设备型号为Van Essen TD-Driver，序列号（SN）19613。
该仪器搭载单路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形槽的安装高度为0.0018米。
带校正项的数据集包含V形槽处观测得到的校正后流量数据。流量计算公式为 $Q = C_d cdot h^{2.5}$。
先以人工实测水深校正数据记录仪的测量结果，随后对差值（dH）进行插值处理；再通过经同样插值处理的流量实测数据，推求流量系数$C_d$。可通过校正人工测量的时间戳，使数据更贴合记录仪的原始记录。
最终校正项（变量名为`clean_corr`）用于修正V形槽堰的堵塞效应，校正规则如下：
$z_1$代表最后一组合格的流量数据，自此之后泥沙淤积将逐步导致堰体堵塞；
$z_2$代表堰体堵塞程度达到峰值的时刻；
$z_3$代表堰体清淤前的临界时刻；
$z_4$代表堰体清淤完成后的时刻；
流量的最大偏差为$Q(z_3) - Q(z_4)$。