Water and suspended sediment discharges for the Mekong Delta, Vietnam (2005-2015)

This dataset describes hourly time series of discharge and suspended sediment flux at four sites in the Vietnamese Mekong Delta (Chau Doc, Tan Chau, Can Tho and My Thaun) for the period 2005 – 2015. This data was calculated from historic Acoustic Doppler Current Profiler (aDcp)data obtained as part of routine flood monitoring conducted by the Vietnamese Hydrological Agency. The data were collated by the authors. The data were processed to back out sediment fluxes through the delta through calibration of the acoustic backscatter signal to suspended sediment concentrations collected in Chau Doc (May 2017) and Can Tho (September 2017). For each aDcp instrument acoustic backscatter signal was calibrated to observed suspended sediment concentrations (SSCs). These concentrations values were then matched to measured acoustic backscatter values (dB) from the depth at which each sample was taken to generate power law calibration curves. To generate daily fluxes, the point specific ADCP fluxes were used to generate sediment ratings curves between sediment flux (kg/s) and discharge (m3/s). These ratings curves were then propagated over recorded daily discharge values measured by the Vietnamese hydrological agency to provide daily fluxes over the period of record. The work was funded through NERC grant reference NE/P008100/1 - Deciphering the dominant drivers of contemporary relative sea-level change: Analysing sediment deposition and subsidence in a vulnerable mega-delta.

本数据集详述了越南湄公河三角洲（周德、单洲、金边和美顺）四个监测站点在2005年至2015年期间每小时时间序列的流量和悬浮泥沙通量。该数据源自越南水文局作为常规洪水监测的一部分所获得的声学多普勒流速剖面仪（Acoustic Doppler Current Profiler，简称aDcp）的历史数据。数据由作者整理。通过对声学后向散射信号进行校准，以匹配在周德（2017年5月）和金边（2017年9月）收集的悬浮泥沙浓度，对数据进行处理，以反演三角洲的泥沙通量。对于每个aDcp仪器，其声学后向散射信号均校准至观测到的悬浮泥沙浓度（SSC）。这些浓度值随后与从采样深度测得的声学后向散射值（dB）相匹配，以生成幂律校准曲线。为生成日通量，利用特定点的ADCP通量生成了泥沙通量（kg/s）与流量（m³/s）之间的泥沙等级曲线。随后，这些等级曲线被应用于越南水文局记录的每日流量值，以提供记录期间每日通量。该研究通过NERC资助的NE/P008100/1号项目得以实施：解码当代相对海平面变化的驱动因素：分析脆弱的大三角洲地区的泥沙沉积和沉降。