| 摘要: |
| 分析太湖的悬浮物浓度时,使用传统的过滤与称重的方法,难以在短时间内取得大量的数据,并且进行大范围调查时困难较多,特别是在计算悬浮物浓度随时间的变化率时,根据导数的定义其时间间隔应足够小,此时上述方法显然难以得出较为准确的结果. 本文从声学后散射原理出发,通过对声学多普勒三维流速仪(ADP)所接收的回声强度在传播距离上的校正,得出了当悬浮物粒径组成较为稳定时,该强度能反映水体中悬浮物浓度 (SSC)的结论,并基于2002年在太湖乌龟山的一次为期一周的湖流观测结果,分析了经校正后的回声强度与太湖中悬浮物浓度间的指数相关关系,通过实测资料对上述关系进行了验证,结果表明该经验公式适用于太湖,其回声强度的变化能反映水体中SSC的变化规律,为大范围调查水体中悬浮物浓度提供了更加快速而有效的方法. |
| 关键词: ADP SSC 太湖 回声强度 |
| DOI：10.18307/2003.0406 |
| 分类号: |
| 基金项目:中国科学院(KZCX1-SW-12);国家自然科学基金(40071019)联合资助. |
|
| Application of ADP in the Study of Sediment Resuspension in Lake Taihu |
|
LUO Liancong1,2, ZHANG Fabing1,2
|
|
1.Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China;2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, P. R. China
|
| Abstract: |
| Traditionally, it is absolutely difficult to collect SSC data(suspended sediment concentration) in the whole lake and impossible to decide the time derivation of SSC with small time interval either. Based on acoustic backscatter theory, this paper presents the denary logarithmic relationship between SSC and the emended ADP signal strength in Lake Taihu on condition that the components of suspended sediment do not change dramatically. Verification is also conducted based on the observation made at Wugui island in July 2002. The satisfactory results suggest the method is available in Lake Taihu and has bright prospect in determining SSC. |
| Key words: ADP SSC Lake Taihu echo intensity |
