摘要
声学技术是水下勘探的主要技术手段,研究典型工况下主要声学设备声波频率与其底泥穿透能力的关系,将为改进底泥分层探测方案和声学设备的选取提供技术依据。本文在典型水域(滨海、河道、水库)应用不同声波频率进行定点底泥穿透深度试验,并在同一点利用定深采样钻采集底泥柱状样,以5~10 cm间隔分层并检测每层含水率,以含水率为指标对底泥进行分类,最后,对底泥柱状样本和声波底泥穿透深度结果进行对比分析。结果表明,12~33 kHz频段声波可穿透河床到达浮泥、流泥层。在滨海水域中,低频声波可穿透部分淤泥层,且频率越低,穿透深度越大。12 kHz频率的双频换能器相比24 kHz和33 kHz具有更强的穿透能力,可满足对浮泥、流泥及部分淤泥层的探测。
Acoustic technology is the main technical means for underwater detection.The relationship between the acoustic frequency of the main acoustic equipment and its penetration capacity of bottom sediment under typical working conditions is studied in this paper,in order to improve the scheme of bottom sediment stratification detection and to provide a technical basis for the selection of acoustic equipment.In this paper,the penetration depth test of fixed-point bottom sediment is conducted in typical waters(coastal,river and reservoir)with different acoustic frequencies,and the sediment samples are collected at the same point by using a depth-keeping sampling drill.The stratification is carried out at intervals of 5-10 cm and the moisture content of each layer is measured,then the bottom sediment is classified according to the moisture content.Finally,the results of columnar samples and those of acoustic sediment penetration depth are compared and analyzed.The results show that the sound waves in the frequency range of 12-33 kHz can penetrate the river bed to reach the fluid mud and flowing mud layer.In the coastal waters,low frequency acoustic wave can penetrate part of the silt layer,and the lower the frequency,the greater the penetration depth.The dual-frequency transducer with 12 kHz frequency has stronger penetrating power than the dual-frequency transducer with 24 kHz and 33 kHz frequency,and can be used to detect fluid mud,flowing mud and some silt layers.
作者
张杰
张坤军
陈佳兵
李京兵
ZHANG Jie;ZHANG Kun-jun;CHEN Jia-bing;LI Jing-bing(Zhejiang Institute of Hydraulics&Estuary,Hangzhou 310020,Zhejiang Province,China;Zhejiang Key Laboratory of Hydraulics Disaster Prevention and Mitigation,Hangzhou 310020,Zhejiang Province,China)
出处
《海洋技术学报》
2020年第2期53-57,共5页
Journal of Ocean Technology
基金
浙江省科技计划资助项目(2016IM020100-4)。
关键词
底泥探测
声波频率
穿透深度
bottom detection
acoustic frequencies
penetration depth
