Maisbich (Luxemburg) river basin discharge data, sensor Q3, month 2009-10

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)父数据集项：卢森堡迈斯比奇（Maisbich）站点2006年11月及之后的Q3（Qdown）流量计观测数据。 测量仪器：迈斯比奇堰槽的V形缺口流量计Q3（Qdown）。 仪器型号：凯勒（Keller）DCX-4.0型压力传感器，序列号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参数。V形缺口相对于传感器的安装高度为-0.0015米。 带校正标记的数据集包含V形堰槽观测得到的校正后流量数据，流量计算公式为Q=Cd·h^2.5。 首先采用手工实测水深对数据记录仪的观测数据进行校正，随后对校正差值（dH）开展插值处理；再结合同样经过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，以更好地匹配记录仪的观测数据。 最后一项校正（变量"clean_corr"）针对V形缺口堰的堵塞情况，校正逻辑如下： z1代表最后一组合格的流量观测值，此后泥沙淤积开始缓慢堵塞堰槽； 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)