Abstract

We developed a high-frequency submersible sub-bottom profiler (HF-SSBP) instrument for taking deep-sea sediment measurement. In order to evaluate the reliability of profile data, a laboratory calibration method (LCM) was developed using illuminated acrylic standard boards in anechoic tank to form multi-layer reflections and evaluate the errors of the HF-SSBP. Two layer reflections induced by single boards in different thicknesses and ranges were performed and recorded, after which four layer reflections induced by two boards with an adjusted water crack were set and logged. The results showed that the HF-SSBP resolution was 44.9 mm in acrylic and its equivalent in the sediment was 28.5 mm. The absolute measure error was 7 mm with an acrylic board thickness of 100 mm, and the maximum measure error was 3.5 mm in different water thicknesses. As a test and application, deep-sea sediment measurement of the HF-SSBP was launched and compared with in situ sampling cores in the same site. The measurement thickness for sections A and B are 39.4 cm and 23.2 cm, respectively, corresponding to the sampling core of 39.8 cm and 23.7 cm. The two results are close as we expected. This work demonstrates the reliability and accuracy of the HF-SSBP measurement, thus providing a good choice for deep-sea submergence vehicles to carry this sonar instrument to obtain high-resolution stratum in deep-sea surficial sediments.

摘要

我们开发了一种用于进行深海沉积物测量的高频潜水式海底剖面仪 (HF-SSBP) 仪器。为了评估剖面数据的可靠性，开发了一种实验室校准方法（LCM），使用照明亚克力标准板在消声槽中形成多层反射并评估HF-SSBP的误差。由不同厚度和范围的单板引起的两层反射进行并记录，然后设置并记录由具有调整的水裂纹的两块板引起的四层反射。结果表明，HF-SSBP 在丙烯酸中的分辨率为 44.9 mm，在沉积物中的等效分辨率为 28.5 mm。绝对测量误差为7毫米，亚克力板厚度为100毫米，最大测量误差为3.5毫米不同水厚度。作为试验和应用，HF-SSBP深海沉积物测量已启动，并与同一地点的原位取样岩心进行比较。A段和B段的测量厚度分别为39.4 cm和23.2 cm，对应39.8 cm和23.7 cm的取样芯。这两个结果与我们预期的很接近。这项工作证明了HF-SSBP测量的可靠性和准确性，从而为深海潜水器携带该声纳仪器获取深海表层沉积物中的高分辨率地层提供了良好的选择。这两个结果与我们预期的很接近。这项工作证明了HF-SSBP测量的可靠性和准确性，从而为深海潜水器携带该声纳仪器获取深海表层沉积物中的高分辨率地层提供了良好的选择。这两个结果与我们预期的很接近。这项工作证明了HF-SSBP测量的可靠性和准确性，从而为深海潜水器携带该声纳仪器获取深海表层沉积物中的高分辨率地层提供了良好的选择。