探地雷达在确定全新世海侵线方面的应用

The application of ground penetrating radar in determination of Holocene transgressive boundary

针对全新世大暖期古海岸线位置的不确定性问题,提出了一种利用探地雷达进行最大海侵位置追踪的方法,在探地雷达可获得连续沉积地层图像的理论基础上,在具有丰富研究资料的莱州湾东岸开展了实验研究。结果表明,利用Mala RAMAC100MHz天线结合相应的图像处理手段,能够识别区域10 m以内浅地层中海陆相沉积物分界面,与已有钻孔和现场探挖浅孔剖面对比,具有较好的一致性。证实了利用探地雷达追踪全新世海侵时期古地层、将海相层尖灭点处确定为最大海侵线位置,进一步恢复古环境是可行的。本文为研究古海岸线位置提供的方法,即通过探地雷达探测地层,得到高清的可视化图像,这使得古海岸线位置确定更精确、更直观。

This work determined Holocene transgressive boundary by using ground penetrating radar （GPR）, based on the theory that GPR image can obtain continuous sedimentary strata. The experimental study was carried out in the east coast of the Laizhou Bay that has a plenty of historical research data. The results show that the interface of marine and terrestrial sediments in the shallow strata within 10 m in the study area was identified by the Mala RAMAC 100 MHz antenna acquisition, which is consistent with the profiles of historical borehole data and field sampling well. It is confirmed that the method can be used to determine the maximum transgression position and recover the paleo-environment by using GPR to trace paleo-formation in the period of Holocene transgression. In conclusion, this study provides the method for research of paleo-coastline position, and makes paleo-coastline position more precise and intuitive through using GPR to survey formation and get visual images with high resolution.