OBS501浊度仪在监测含沙量中的应用

Application of OBS501 Turbidity Meter to Monitor Sediment Concentration

河道悬移质泥沙测定,目前采用船只在河道规定垂线现场取样后,通过沉淀、过滤、称重等分析河道含沙量,该方法操作繁杂,耗时长,效率低,不能实时连续观测泥沙变化过程。近年来,光学仪器已广泛应用于悬沙浓度的观测研究中,OBS (Optical Back Scattering) 501可自记测验点的浊度、水温等特征值,数据的采集、处理均可在现场完成,自动化程度高,且操作简单,能够快速、实时、连续测量,目前多应用于水体含沙量波动较大的潮汐河口及沿海悬浮泥沙的监测,而对于河道断面含沙量在线监测应用较少,为了实现连续观测泥沙变化过程,本文将OBS501浊度仪推算含沙量与实测含沙量进行比测分析,检验是否满足测验精度要求,以便推广应用。

At present, the sediment concentration in river course is analyzed by sedimentation, filtration, weighing and so on after the ship sampling in the vertical line of the river course. This method is complicated, time-consuming, inefficient and cannot continuously observe the sediment change process in real-time. In recent years, optical instruments have been widely used in the observation and research of suspended sediment concentration. OBS (Optical Back Scattering) 501 can record the turbidity, water temperature and other characteristic values of the test points by itself. Data acquisition and processing can be completed in the field, with high degree of automation, simple operation, rapid, real-time and continuous measurement. At present, it should be used in many fields. It is used to monitor suspended sediment in tidal estuaries and coastal areas where sediment concentration fluctuates greatly, but it is seldom used for online monitoring of sediment concentration in river sections. In order to realize continuous observation of sediment variation process, OBS501 turbidimeter is used to compare the calculated sediment concentration with the measured sediment concentration to verify whether it meets the requirements of experimental accuracy in order to promote application.