Study on the Relationship between Groundwater and Land Subsidence in Bangladesh Combining GRACE and InSAR

被引：0
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作者：
Ouyang, Liu [1 ,2 ,3 ]
Zhao, Zhifang [2 ,3 ,4 ,5 ]
Zhou, Dingyi [1 ,2 ,3 ]
Cao, Jingyao [2 ,3 ,4 ]
Qin, Jingyi [2 ,3 ,4 ]
Cao, Yifan [1 ,2 ,3 ]
He, Yang [1 ]
机构：
[1] Institute of International Rivers and Eco-Security, Yunnan University, Kunming,650500, China
[2] Yunnan International Joint Laboratory of China-Laos-Bangladesh-Myanmar Natural Resources Remote Sensing Monitoring, Kunming,650500, China
[3] Research Center of Domestic High-Resolution Satellite Remote Sensing Geological Engineering for Universities in Yunnan Province, Kunming,650500, China
[4] School of Earth Sciences, Yunnan University, Kunming,650500, China
[5] Yunnan Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Kunming,650051, China
来源：
Remote Sensing | 2024年 / 16卷 / 19期
关键词：
Due to a heavy reliance on groundwater; Bangladesh is experiencing a severe decline in groundwater storage; with some areas even facing land subsidence. This study aims to investigate the relationship between groundwater storage changes and land subsidence in Bangladesh; utilizing a combination of GRACE and InSAR technologies. To clarify this relationship from a macro perspective; the study employs GRACE data merged with GLDAS to analyze changes in groundwater storage and SBAS-InSAR technology to assess land subsidence. The Dynamic Time Warping (DTW) method calculates the similarity between groundwater storage and land subsidence time series; incorporating precipitation and land cover types into the data analysis. The findings reveal the following: (1) Groundwater storage in Bangladesh is declining at an average rate of −5.55 mm/year; with the most significant declines occurring in Rangpur; Mymensingh; and Ra[!text type='js']js[!/text]hahi. Notably; subsidence areas closely match regions with deeper groundwater levels; (2) The similarity coefficient between the time series of groundwater storage and land subsidence changes exceeds 0.85. Additionally; land subsidence in different regions shows an average lagged response of 2 to 6 months to changes in groundwater storage. This study confirms a connection between groundwater dynamics and land subsidence in Bangladesh; providing essential knowledge and theoretical support for further research. © 2024 by the authors;
D O I：
10.3390/rs16193715
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