基于多普勒声学原理测定海水悬沙质量浓度

Determination of Suspended Sediment Concentration by ADCP Signal Strength

基于多普勒流速仪发射声脉冲波并接收悬沙颗粒反射的信号,通过信号强弱计算悬沙质量浓度的原理,进行室内模拟试验。当均匀搅动泥沙时,所得信号强度曲线均为光滑曲线,上半部分随水深增加信号值逐渐减弱。一系列悬沙质量浓度与信号强度数据进行回归分析,得回归方程且相关系数较高,反映出悬沙质量浓度与信号强度有着密切的相关关系。将外业数据与回归方程拟合,平均相对误差在测量误差允许范围内,进一步验证了方程的正确性。

Based on the fact that Acoustic Doppler Current Profilers （ADCP） can emit acoustic pulse waves and receive reflected signals from suspended sediment particles, the suspended sedi ment concentration can be calculated. The signal strength curve graphs obtained through uniform agitation of sediment are universally smooth curves. The signal values in the upper part gradually drop as the water depth increases. The regression analysis coefficient of signal strength and sus pended sediment concentration is relatively high, which indicates the close correlation between them. The field data and equation are fitted and the average relative error fails right within the measurement error range, which further verifies the equation.