TURBULENT-FLOW MICROSTRUCTURES OBSERVED BY SONAR

被引：10

作者：

LHERMITTE, R ^{[1
]}

LEMMIN, U ^{[1
]}

机构：

[1] ECOLE POLYTECH FED LAUSANNE,ECUBLENS,SWITZERLAND

来源：

GEOPHYSICAL RESEARCH LETTERS | 1993年 / 20卷 / 09期

关键词：

D O I：

10.1029/93GL00840

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This note presents observations of sound wave backscattering in a turbulent water flow, conducted with a frequency scanning Doppler sonar working in a 0.5 to 5 MHz frequency band. The observed sound wave backscattering is attributed to temperature microstructures created by water turbulence. The backscattering intensity decreases systematically as a function of sonar frequency above 1 MHz and falls below detectability for sonar frequencies higher than a given value function of water turbulence intensity. This backscattering cutoff relates to the high wavenumber end, k(B), of the turbulent temperature spectrum. This k(B) estimate is found in excellent agreement with its theoretical calculation based on independent measurement of turbulence dissipation rate made using the Doppler observed velocity variance.

引用

页码：823 / 826

页数：4

共 11 条

[1]

Batchelor G K, 1957, S NAV HYDR NAT AC SC, P409

[2] SMALL-SCALE VARIATION OF CONVECTED QUANTITIES LIKE TEMPERATURE IN TURBULENT FLUID .1. GENERAL DISCUSSION AND THE CASE OF SMALL CONDUCTIVITY [J].