缆控式海底沉积物声温同步探测取样系统研发与应用

Development and application of a cable-controlled marine sediment acoustic,temperature-based,and sampling system

为精确测量海底浅表层沉积物声学及温度参数,自主研发了一种缆控式海底沉积物声温同步原位探测取样系统。与国内外传统的沉积物声学原位探测系统相比,该系统能够完成深海浅表层沉积物声速、声衰减等声学参数以及多点位温度的原位实时测量,同时实现了可视化同步精准取样。整套系统以5个单元为基础构建,包括声学参数原位测量系统、多点位温度梯度探测系统、浅表层沉积物取样系统、固定组件以及实时通讯控制系统,实现了声波发射和接收、沉积物取样、多点位温度探测等关键技术的融合。本套系统于2022年5月在台西南盆地进行了海试应用,成功获取了试验区域海底浅表层沉积物的声速、声衰减系数、温度梯度等原位参数。海试结果表明,该系统工作稳定,声速测量精度小于2%,原位温度梯度精度误差小于0.001℃。同时,获取低扰动高保真的原位柱状沉积物样品共计超过3 m,用于后期实验室与原位测量的对比分析。该系统的成熟应用,有助于提高海底浅表层沉积物声学参数的探测效率与精度。

To accurately measure the acoustic and temperature parameters of subsurface sediments,a cable-controlled,marine sediment,acoustic,temperature,and sampling system is independently developed for the synchronous detec-tion of subsea sediments.The system can measure the acoustic parameters,such as the sound velocity and attenuation,and multipoint temperatures in real time.Furthermore,it realizes in-situ visualization and more accurate sampling compared with the traditional in-situ acoustic measurement technique used globally.The system comprises five units:an in-situ acoustic parameter measurement system,a multipoint temperature gradient detection system,a shallow sediment sampling system,a real-time communication control system,and fixed components.The basic construction of the system realizes the integration of key technologies,along with a scientific layout and coordination among vari-ous systems.The technique was successfully tested in the Southwest Tainan Basin in May 2022,following which the in-situ parameters(such as the sound velocity,attenuation coefficient,and temperature gradient)of shallow seabed sediments in the test area were obtained.The following observations are derived from the aforementioned test:the system works in a stable manner,sound velocity measurement accuracy is about 2%,and in-situ temperature gradient accuracy error is<0.001℃.Moreover,low-disturbance,high-fidelity in-situ columnar sediment samples totaling>3 m in length are obtained for later comparative analysis between the laboratory and in-situ measurements.The mature application of this system will help increase the detection efficiency and accuracy of the acoustic parameters of shal-low seabed sediments.