利用ADCP和LISST-100仪观测悬浮物浓度的研究

原野; 赵亮; 魏皓; 江文胜

利用ADCP和LISST-100仪观测悬浮物浓度的研究

中国海洋大学物理海洋教育部重点实验室, 山东青岛 266100

基金项目: 国家基础研究规划重点项目"近海重要界面的物质交换过程"资助(2006CB400602);"中国东部陆架边缘海海洋物理环境演变及其环境效应"资助(2005CB422300)

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出版历程
- 收稿日期: 2007-01-03
- 修回日期: 2007-11-21

Research on observing suspended sediment concentration using ADCP and LISST-100 instruments

Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China

摘要

摘要: 利用黄河口海床基声学多普勒流速剖面仪(ADCP)的周日观测资料对悬浮物浓度进行了反演,反演过程中综合考虑了球面扩散、声学近场的非球面扩散、海水和悬浮颗粒的吸收衰减以及其他因素对回声信号的影响,结果表明在粒径保持相对稳定的情况下,利用ADCP仪回声强度反演悬浮物浓度具有较高的精度.结合现场激光粒度仪(LISST-100)测得的粒径分布信息在反演过程中考虑了粒径修正,重点讨论了观测区域粒径变化对结果的影响,结果表明粒径的剧烈变化会降低体积后向散射强度与悬浮物浓度之间的相关性.大颗粒物质的存在使计算得到的悬浮物浓度偏高,粒径修正虽然在一定程度上消除了这种影响,但线性拟合的相关性并未提高.
- ADCP仪 /
- LISST-100仪 /
- 回声强度 /
- 体积后向散射强度 /
- 粒径
Abstract: To determine the feasibility obtained by acoustic Doppler current profiler(ADCP) for estimating suspended sediment concent ration(SSC) in the coastal sea,a field experiment was designed and carried out in the Huanghe Estuary.An acoustic model was set up to estimate the concent ration of suspended particulate matter(SPM) from ADCP echo intensity,which accounted not only for the at tenuation caused by seawater and SPM,but also the corrections of non-spherical spreading in the transducer near-field and inst rument status.If the particle size distribution(P SD) remains stable during the observation,the acousticetimates of SSC agree well with bottle samples and the LISST-100 measurement.On the basis of the Rayleigh scat tering theory,an improved calibration equation is used in the model for particle size correction.Detailed discussions on PSD indicated that large size variation would make the result suspect able,and the exist ence of large particles would overest imate the SPM concentration.
- ADCP /
- L ISST-100 /
- echo intensity /
- volume backscatter strength /
- particle size

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