沿海沉降变化GNSS定位及GNSS-IR组合监测

doi:10.11947/j.AGCS.2023.20210414

测绘学报 ›› 2023, Vol. 52 ›› Issue (1): 32-40.doi: 10.11947/j.AGCS.2023.20210414

沿海沉降变化GNSS定位及GNSS-IR组合监测

王笑蕾, 牛紫瑾, 何秀凤, 李润川

河海大学地球科学与工程学院, 江苏南京 211100

收稿日期:2021-07-20 修回日期:2022-10-16 发布日期:2023-02-09
通讯作者: 牛紫瑾 E-mail:nzjhhu@163.com
作者简介:王笑蕾(1991—),女,博士,副教授,研究方向为GNSS遥感。E-mail: chd_wxl@qq.com
基金资助:
中央高校基本科研业务费专项资金(B200202015);国家自然科学基金(42004018);江苏省自然科学基金(BK20190496)

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

WANG Xiaolei, NIU Zijin, HE Xiufeng, LI Runchuan

School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Received:2021-07-20 Revised:2022-10-16 Published:2023-02-09
Supported by:
The Fundamental Research Funds for the Central Universities (No.B200202015);The National Natural Science Foundation of China (No.42004018);The Natural Science Foundation of Jiangsu Province (No.BK20190496)

摘要/Abstract

摘要： 目前沿海沉降监测通常用全球导航卫星系统(GNSS)定位技术测量,然而其反映的是站点基底下方的沉积物沉降情况,对于站点基底以上的沉降信息则无法获知。而沿海地区由于冲积作用,沉积物快速堆积和压实,沉降变化较大。因此,需要对基底上方沉降进行监测,才能获得沿海整体沉降信息。随着GNSS的不断发展,GNSS-interferometric reflectometry(GNSS-IR)技术被证明可以利用多路径效应进行反射面高度监测。由于GNSS站点基底较深,且基座长度不变,通过GNSS-IR技术获得的地面高度变化,可以反映基底上方沉降情况。因此,本文利用GNSS-IR技术来测量基底上方沉降变化;同时,利用GNSS定位技术获得基底下方沉降变化,再综合利用GNSS-IR及GNSS定位技术获得整体沉降变化。本文选取沉积厚度较大的密西西比河三角洲作为试验地区,选取FSHS、GRIS和MSIN测站数据进行分析,相关算例结果表明:GNSS-IR可以用来测量基底上方沉降速率,改正后的整体沉降速率与相对海平面上升速率相当,可以更好地估计洪水易发性和陆地损失。

关键词: GNSS-IR, GNSS定位, 沿海沉降变化, 基底上方沉降变化, 整体沉降变化

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

中图分类号:

P227

王笑蕾, 牛紫瑾, 何秀凤, 李润川. 沿海沉降变化GNSS定位及GNSS-IR组合监测[J]. 测绘学报, 2023, 52(1): 32-40.

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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沿海沉降变化GNSS定位及GNSS-IR组合监测

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

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