Maisbich (Luxemburg) river basin discharge data, sensor Q3, month 2010-02

Parent item: Maisbich (Luxemburg), data from discharge meter Q3 (Qdown), 2006-11 and later Measuring instrument: Maisbich basin: V-notch discharge meter Q3 (Qdown) Type: Pressure Sensor Keller DCX-4.0, SN 1467 This instrument is based on differential pressure measurement of two absolute sensors. The sensors measure pressure and temperature. Height of V-notch above sensor: -0.0015m. 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)

父项：卢森堡迈斯比奇（Maisbich）站点2006年11月及之后的Q3（Qdown）流量计量仪采集数据。
测量仪器：迈斯比奇堰槽V形缺口流量计量仪（V-notch discharge meter）Q3（Qdown），配套压力传感器（Pressure Sensor）型号为Keller DCX-4.0，序列号SN 1467。
该仪器基于双绝对压力传感器的差压测量原理，可同步采集压力与温度数据。V形缺口相对于传感器的安装高度为-0.0015米。
经校正的数据集包含在V形堰槽处观测得到的校正后流量，流量计算公式为Q=Cd*h^2.5。
先通过人工实测水深对数据记录仪的采集数据进行校正，随后对差值（dH）进行插值处理；再基于经插值的流量实测数据，确定流量系数Cd。
可对手工测量的时间戳进行校正，以更贴合记录仪的记录值。
最后一项校正（变量"clean_corr"）针对V形堰槽的堵塞情况开展，校正逻辑如下：
z1代表最后一组合格的流量数值，此后淤积物开始缓慢堵塞堰槽；
z2代表堵塞程度达到峰值的时刻；
z3代表堰槽清淤前的瞬时时刻；
z4代表堰槽清淤后的瞬时时刻。
流量的最大差值为Q(z3)-Q(z4)。