Monitoring of Coastal Subsidence Changes Based on GNSS Positioning and GNSS-IR

doi:10.11947/j.JGGS.2023.0208

Abstract

Abstract:

Coastal subsidence monitoring typically employs Global Navigation Satellite System (GNSS) positioning technology. This method provides information only about subsidence below the station base. Sediments in coastal areas tend to accumulate quickly, and subsidence can change significantly due to compaction and alluvium. Therefore, monitoring subsidence above the base is essential to obtain overall coastal subsidence. A new technology called GNSS-Interferometric Reflectometry (GNSS-IR) has been recently developed, which can utilize multipath effects to monitor reflector height. Since the base of the GNSS station is deep and the base length remains constant, the height changes measured by the GNSS-IR technology can reflect subsidence above the base. Accordingly, this paper employs GNSS-IR technology to measure subsidence changes above the base. Additionally, GNSS positioning technology is used to obtain subsidence changes below the base, and the overall subsidence change is then calculated using both GNSS-IR and GNSS positioning technology. The Mississippi River Delta, known for its significant sediment thickness, was selected as the study area, and data from FSHS, GRIS, and MSIN stations was analyzed. The results demonstrate that GNSS-IR can be used to measure the subsidence rate above the base, and the corrected overall subsidence rate is equivalent to the relative sea level rise rate.

Key words: GNSS-IR; GNSS positioning; coastal subsidence changes; subsidence changes above the base; overall subsidence changes

Xiaolei WANG, Zijin NIU, Xiufeng HE, Runchuan LI. Monitoring of Coastal Subsidence Changes Based on GNSS Positioning and GNSS-IR[J]. Journal of Geodesy and Geoinformation Science, 2023, 6(2): 71-80.

Figures/Tables 10

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References 28

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Site	Longitude	Latitude	Receiver type	Sampling interval/s	Base depth /m	Holocene-Pleistocene depth/m
GRIS	-89.9573°W	29.2655°N	TRIMBLE NETR9	30	-20	-58.2
FSHS	-91.5022°W	29.8053°N	TRIMBLE NETRS	30	-1	-21.3
MSIN	-89.6043°W	30.3117°N	TRIMBLE NETR9	30	-2.4	-1.2

Site	Subsidence rate under the base	Subsidence rate above the base	Overall subsidence rate
GRIS	-4.5±0.3	-10.3±1.6	-14.0±2.0
FSHS	-3.4±0.1	-4.9±0.7	-7.8±0.7
MSIN	1.8±0.4	-1.8±0.7	-0.2±0.8