Maisbich (Luxemburg) river basin discharge data, sensor Q3, month 2009-11

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：
迈斯比奇（Maisbich，卢森堡）站点，取自Q3（Qdown）排放流量计的观测数据，时段为2006年11月及之后。

测量仪器：
迈斯比奇堰槽：三角堰（V-notch）排放流量计Q3（Qdown）
型号：凯勒（Keller）DCX-4.0型压力传感器，序列号（Serial Number，SN）1467。该仪器基于双绝对传感器的差压测量原理，可同步采集压力与温度数据。
传感器上方三角堰的安装高度为-0.0015米。

经校正数据集包含经校正后的三角堰观测流量。流量计算公式为：Q = Cd·h^2.5。
我们先通过人工实测水深对记录仪测量数据进行校正，随后对校正后的差值（dH）进行插值处理；再结合同样经插值的流量测量结果，推导得到流量系数Cd。人工实测时刻可进行校正，以更贴合记录仪记录的原始数值。

本次最终校正（对应变量"clean_corr"）针对三角堰的堵塞情况开展，校正规则如下：
z1代表泥沙沉积开始缓慢堵塞堰槽后的最后一组有效流量观测值；
z2代表堰槽堵塞程度达到峰值的时刻；
z3代表堰槽清理作业前的临界时刻；
z4代表堰槽清理完成后的时刻。
流量的最大偏差为Q(z3) - Q(z4)。