基于Chirp数据反演琼州海峡海底沉积物物性

doi:10.13284/j.cnki.rddl.002943

摘要/Abstract

摘要： Chirp浅剖数据不仅能刻画海底地层的地质构造信息，还能用于海底沉积物物性特征的反演。利用在琼州海峡南方主网与海南电网第二回联网工程海底电缆路由调查项目中所获取的浅剖数据，采用地球物理方法即基于Biot-Stoll模型来反演海底表层沉积物声速、密度和孔隙度等物理性质。通过该反演方法得到研究区海底沉积物声速、密度、孔隙度及海底反射系数剖面，其中反演孔隙度、密度与实测孔隙度、密度相对误差均＜10%，结果与实测值基本相符，表明Biot-Stoll模型和Chirp浅剖数据反演海底沉积物物性的方法在琼州海峡海域切实可行，为在该海域采用间接方法来获取海底沉积物物理性质特征提供了新的选择，同时也为海洋工程浅剖数据利用提供了新的思路。

关键词: Chirp浅剖数据, Biot-Stoll模型, 反演, 海底沉积物物性, 琼州海峡

Abstract: The Chirp sub-bottom data can not only characterize the geological structure information of stratum, but also can inverse the physical properties of surface sediments in seabed. Chirp signal is generated by computer with stable energy and good consistency. Formulated-frequency technology is applied to Chirp sub-bottom profiler, and higher frequency gradually attenuates when the signals travel through the sub-bottom sediments. We could study the changes of the physical properties of the sub-bottom sediments by the varieties of the attenuation. This paper uses the chirp data got from the cable route survey of China Southern Power Grid second connecting with Hainan Grid and Biot-Stoll model to inverse the physical properties of surface sediments in seabed of this sea area, and get the inversion velocity, density, porosity of surface sediments. The relative errors of inversion porosity, density are less than 10%, as compared with those of situ detection, which states that the inversion data are basically consistent with the situ detection data. This method can inverse the physical properties of surface sediments on the whole sub-bottom profile continuously, but needs to be optimized to improve the accuracy. This indicates that using chirp data to inverse the physical properties of surface sediments in seabed in Qiongzhou Strait sea area by Biot-Stoll model is feasible, which provides a new choice to get the physical properties of surface sediments indirectly in this sea area, and a new reference of using sub-bottom data in sea engineering survey.

Key words: Chirp Bottom data, Biot-Stoll model, inverse, physical properties of surface sediments in seabed, the Qiongzhou Strait

陈静，吕修亚，陈亮，郑红波，林秋金. 基于Chirp数据反演琼州海峡海底沉积物物性[J]. 热带地理, 2017, 37(6): 874-879.

CHEN Jing，LYU Xiuya，CHEN Liang，ZHENG Hongbo，LIN Qiujin. Physical Properties of the Seabed Inversed by Chirp Data in the Qiongzhou Strait [J]. TROPICAL GEOGRAPHY, 2017, 37(6): 874-879.

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