基于GRACE的甘盆地地下水干旱评估和使用基于波形量的方法对干旱传播的分析
Suvro Aon1, Subimal Nandi1, Shoubhik Sen1
1Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India.
The Science of the total environment
|August 22, 2024
概括
在甘河流域的地下水干旱是使用GRACE和GLDAS数据进行评估的. 一种新的交叉波形转换方法揭示了干旱传播时间,显示了地下水储量的显著下降.
科学领域:
- 水文学的水文学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 由于人类活动,甘河流域面临严重的地下水干旱,影响了近50亿人.
- 评估地下水干旱及其从气象干旱传播对这个重要地区至关重要.
研究的目的:
- 用GRACE和GLDAS数据集评估甘河流域的历史地下水干旱情况.
- 通过使用交叉波段转换 (XWT) 引入一种新的定量方法来确定干旱传播时间.
主要方法:
- 利用重力恢复和气候实验 (GRACE) 和全球土地数据同化系统 (GLDAS) 数据集用于地下水干旱评估.
- 采用交叉波形变换 (XWT) 来确定干旱传播时间,克服了传统相关联方法与GRACE衍生的地下水干旱指数 (GGDI) 的局限性.
主要成果:
- 地下水储存异常 (GWSA) 显示了上游河流盆地 (UGB) 和Yamuna Chambal盆地 (YCB) 的显著下降趋势.
- 从2017年到2022年,UGB和YCB经历了地下水干旱.
- 干旱传播时间为YCB确定为14个月,UGB为17个月,LGB为21个月.
结论:
- 新的XWT方法有效地确定了地下水干旱传播时间,独立于人为趋势.
- YCB对气象强迫的反应更快,而LGB对气象强迫的反应更慢,突出了干旱动态的区域差异.
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