Monitoring of coastal sedimentation changes based on GNSS and GNSS-IR

doi:10.11947/j.AGCS.2023.20210414

Abstract

Abstract: Coastal settlement monitoring usually uses the Global Navigation Satellite System (GNSS) positioning technology to measure at present. However, it only reflects the sediment settlement below the station base, and the settlement information above the station base cannot be obtained. In coastal areas, sediments accumulate rapidly, and settlement changes greatly under compaction and alluvium. Therefore, it is necessary to monitor the settlement above the base in order to obtain the overall coastal settlement information. With the continuous development of GNSS, a new GNSS interactive reflectometry (GNSS-IR) technology has been proved to be able to use multipath effect for reflector height monitoring. Because the base of GNSS station is deep and the base length remains unchanged, the ground height change obtained by GNSS-IR technology can reflect the settlement above the base. Therefore, the paper use GNSS-IR technology to measure the subsidence changes above the base; At the same time, the settlement below the base change is obtained by using GNSS positioning technology, and then the total settlement change is obtained by using GNSS-IR and GNSS positioning technology. The Mississippi River Delta with large sediment thickness is selected as the test area, and the data of FSHS, GRIS and MSIN stations are selected for analysis. The results show that GNSS-IR can be used to measure the settlement rate above the base, and the corrected total settlement rate is equivalent to the relative sea level rise rate, which can better estimate the flood susceptibility and land loss.

Key words: GNSS-IR, GNSS positioning, coastal sedimentation changes, subsidence changes above the base, total sedimentation changes

CLC Number:

P227

WANG Xiaolei, NIU Zijin, HE Xiufeng, LI Runchuan. Monitoring of coastal sedimentation changes based on GNSS and GNSS-IR[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(1): 32-40.

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