周东旭, 冯义楷, 张化疑, 付延光, 唐秋华. 联合卫星测高和GNSS观测的天津沿海近25年相对海平面变化分析[J]. 武汉大学学报 ( 信息科学版), 2024, 49(5): 775-784. DOI: 10.13203/j.whugis20210532
引用本文: 周东旭, 冯义楷, 张化疑, 付延光, 唐秋华. 联合卫星测高和GNSS观测的天津沿海近25年相对海平面变化分析[J]. 武汉大学学报 ( 信息科学版), 2024, 49(5): 775-784. DOI: 10.13203/j.whugis20210532
ZHOU Dongxu, FENG Yikai, ZHANG Huayi, FU Yanguang, TANG Qiuhua. Analysis of Relative Sea Level Change of Tianjin Coast in Recent 25 Years Using Satellite Altimetry and GNSS Observations[J]. Geomatics and Information Science of Wuhan University, 2024, 49(5): 775-784. DOI: 10.13203/j.whugis20210532
Citation: ZHOU Dongxu, FENG Yikai, ZHANG Huayi, FU Yanguang, TANG Qiuhua. Analysis of Relative Sea Level Change of Tianjin Coast in Recent 25 Years Using Satellite Altimetry and GNSS Observations[J]. Geomatics and Information Science of Wuhan University, 2024, 49(5): 775-784. DOI: 10.13203/j.whugis20210532

联合卫星测高和GNSS观测的天津沿海近25年相对海平面变化分析

Analysis of Relative Sea Level Change of Tianjin Coast in Recent 25 Years Using Satellite Altimetry and GNSS Observations

  • 摘要: 针对现有验潮公开数据因时间范围及潮位沉降修正等影响,难以真实反映天津沿海相对海平面变化的问题,基于全球导航卫星系统(global navigation satellite system,GNSS)与验潮并置观测,设计了联合卫星测高和GNSS观测的天津沿海相对海平面变化分析方法。分析结果显示,1993—2018年期间,塘沽验潮站点的相对海平面上升速率约为13.45±0.45 mm/a;联合4个虚拟并置观测站,得到天津沿海不同区域的相对海平面上升速率在11.15~19.17 mm/a,平均上升速率15.09±0.45 mm/a。沿海地面沉降是天津相对海平面上升速率偏高的主要因素(贡献率大于70%),受地面沉降非均匀空间分布的影响,海平面上升速率存在区域差异,塘沽验潮站难以代表整个天津沿海的相对海平面变化。

     

    Abstract:
    Objectives In recent 40 years, the risk of sea level rise in China’s coastal areas is further increased with the acceleration of sea level rise, especially in serious land subsidence areas (e.g., Tianjin, Shanghai). However, it is difficult to know the real relative sea level (RSL) change at Tianjin coast due to time frame and subsidence correction of the public tidal data. To solve this issue, we propose an analysis method of RSL change by using the data of satellite altimetry and global navigation satellite system (GNSS).
    Methods The method is executed based on the idea of the collocating observation of GNSS and tide gauge. Meanwhile, to obtain RSL in different areas of Tianjin coast, we simulate 4 GNSS and tide gauge co-stations. First, the absolute sea level change and vertical land motion of tide gauge stations are determined by using the data of satellite altimetry and co-located GNSS observations, respectively. Then, the relative sea level rise of Tanggu and four virtual tide gauge stations is calculated. Finally, the feasibility of our method is discussed based on multi-year leveling data.
    Results The results show that the RSL rate was 13.45±0.45 mm/a at Tanggu tide station in the past 25 years, the RSL rate of four fictitious stations varied from 11.15±0.44 mm/a to 19.17±0.45 mm/a, and the mean rate along Tianjin coast was 15.09±0.45 mm/a. Vertical land motion and its non-uniform distribution were the main influencing factors of the RSL rise and its regional differences, with the contribution rate more than 70%.
    Conclusions Our research provides a new and feasible method for analyzing the RSL rise of Tianjin coast, however, it is still necessary to encrypt the tide observation facilities along the coast and retain and release the original tidal data, which can better serve the monitoring and research of sea level in Tianjin coastal area.

     

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