Maisbich (Luxemburg) river basin discharge data, sensor Q4, month 2009-03

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)

关联父项：卢森堡迈斯比奇（Maisbich）站点，数据取自Q4（Qup）型流量计，观测时段为2006年12月及以后。测量仪器：迈斯比奇三角堰（V-notch）流量计Q4（Qup）；设备型号：Van Essen TD型采集器，序列号19613。该仪器采用1台绝对压力传感器测量压力，同时可采集温度数据。传感器上方三角堰的安装高度为0.0018米。带校正项的数据集包含三角堰处观测得到的校正后流量值，流量计算公式为Q=Cd·h^2.5。先以人工实测水深校正记录仪的测量数据，随后对校正产生的差值（dH）进行插值处理；再通过同样经插值处理的流量观测数据，确定流量系数Cd。可对人工测量的时间戳进行校正，以更准确地匹配记录仪记录的数值。最后一项校正操作（变量名为"clean_corr"）用于修正三角堰堰体堵塞带来的流量偏差，具体规则如下：z1代表沉积缓慢开始堵塞堰体后的最后一组有效流量值；z2代表堰体堵塞程度达到峰值的时刻；z3代表堰体清理前的临界时刻；z4代表堰体清理完成后的时刻。流量最大差值为Q(z3)-Q(z4)