在亚马逊河流域使用GNSS垂直坐标时间序列监测陆地水库变化
Yifu Liu1, Keke Xu2, Zengchang Guo1,3
1School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
Scientific reports
|October 14, 2024
概括
全球导航卫星系统 (GNSS) 的数据有效监测亚马逊盆地的陆地水储量 (TWS) 变化. 这种方法补充了重力恢复和气候实验 (GRACE) 数据,提供更好的时间分辨率.
科学领域:
- 地质测量是指地质测量.
- 水文学的水文学
- 遥感 遥感 遥感 遥感
背景情况:
- 陆地储水 (TWS) 是水循环的关键组成部分,影响气候和水资源管理.
- 监测TWS变化,特别是在亚马逊等大盆地,由于规模和可访问性,提出了重大挑战.
- 像GRACE这样的现有方法提供了宝贵的见解,但在时间分辨率和数据采集方面存在局限性.
研究的目的:
- 调查全球导航卫星系统 (GNSS) 数据在监测亚马逊河流域陆地储水 (TWS) 变化的潜力.
- 开发和验证一种使用GNSS衍生的垂直地变形来逆转TWS变化的新方法.
- 将基于GNSS的TWS监控的性能和特征与传统的GRACE卫星数据进行比较.
主要方法:
- 利用了来自亚马逊河流域的GNSS坐标时间序列数据.
- 采用变化模式分解和双向长期短期记忆 (VMD-BiLSTM) 来提取垂直地变形.
- 应用主要成分分析 (PCA) 来逆转TWS变化,并将结果与GRACE数据进行比较.
主要成果:
- 与传统方法相比,拟议的VMD-BiLSTM方法表现出优越的除能力.
- 来自GNSS的表面水力负荷变形准确地反映了区域TWS变化,显示出与GRACE数据的强烈一致性,包括季节性变化.
- GNSS提供了比GRACE更细的时间尺度上的TWS变化数据,突出了其全天候测量优势.
结论:
- 来自GNSS的垂直地变形是一种可行的方法,可以逆转陆地储水变化.
- 作为GRACE的宝贵补充技术,GNSS用于监测TWS,提供增强的时间分辨率和全天候功能.
- 整合GNSS和GRACE数据可以更全面地了解大河流盆地的水文过程.
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