利用ADCP回波强度估算河流悬移质含沙量的应用研究

Study on application of echo amplitude of ADCP to estimation on sediment concentration of river suspended load

通过简要介绍利用声学多普勒水流剖面仪(ADCP)回波强度估算悬移质含沙量的基本原理,结合梧州水文站的应用实例,利用ADCP的回波强度数据和现场采集的水样含沙量建立相关关系,根据相关关系由回波强度反演估算的水体悬移质含沙量验证了利用ADCP的回波强度估算悬移质含沙量的可行性。应用于梧州水文站的实践表明,左河道推算的系统误差为-0.1%,右河道推算的系统误差为1.5%。这种方法具有不扰动流场、测量剖面同步性较好、数据空间分辨率较高的优点,与传统的取样过滤称量法相比,计算效率显著提高。

Through the brief introduction of the use of ADCP echo intensity estimates the basic principles of suspernload sedime concentrat and combined with the application case of Wuzhou Hydrological Station,a correlation between the data of the echo amplitude of Acoustic Doppler Current Profiler（ ADCP） and the sediment concentration of the in situ water sample is established,and then the feasibility of estimating the sediment concentration of suspended load with the echo amplitude of ADCP is verified by the sediment concentration of suspended load inversely calculated from the echo amplitude. Through the relevant practice in Wuzhou hydrogicstation,it is indicated that systematic error is- 0. 1% in left channel estimation and 1. 5% in right channel estimation this method has the merits of no flow field disturbance,better synchronization of measuring profiles and higher dataspace resolution ratio,thus the calculation efficiency is significantly enhanced,if compared with the conventional sample filtering-weighting method.