推进地质灾害监测:孟加拉国北部和中部地面沉降的Sentinel-1 InSAR观测

IF 1.4 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Geological Journal Pub Date : 2025-04-28 DOI:10.1002/gj.5206
Gavin D. Middleton, Nahid D. Gani, M. Royhan Gani
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引用次数: 0

摘要

孟加拉三角洲的孟加拉国面临着复杂的环境问题,包括海平面上升、沿海洪水、人口密度高和普遍贫困。这些因素导致严重的土地流失、盐水入侵、水资源短缺和生物多样性下降,气候变化进一步加剧了这些因素。这些挑战极大地威胁着地下水的可用性,并增加了下沉、滑坡和洪水等自然灾害的可能性。本研究利用差分干涉合成孔径雷达(DInSAR)和持续散射干涉合成孔径雷达(PSI)技术,利用上升的Sentinel-1卫星数据,定量绘制了城市和农业环境下下沉的空间分布。从2017年3月到2022年10月,我们分析了55对DInSAR图像和142对PSI图像,重点关注DInSAR和PSI的五个目标位置。研究结果显示,达卡市区的平均沉降率为16毫米/年,五个农业地点的半季节性沉降变化也很明显。具体速率为达卡7毫米/年,拉杰沙希和迈门辛格8毫米/年,兰布尔9毫米/年。sylheet以5毫米/年的速度沉降,可能与褶皱冲断带和道基断层有关。我们的研究强调了人类活动对环境的重大影响,如地下水开采和土地利用的变化,这些活动通过孟加拉水机导致了地面沉降和地下水枯竭。虽然需要进一步的研究来全面了解地表沉降率、地质因素和地貌变化之间的关系,但我们的研究结果为当前气候变化和该地区持续的环境退化的影响提供了重要的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Advancing Geohazard Monitoring: Sentinel-1 InSAR Observations of Land Subsidence in Northern and Central Bangladesh

Bangladesh in the Bengal Delta faces complex environmental issues, including sea-level rise, coastal flooding, high population density, and widespread poverty. These factors lead to severe land loss, saltwater intrusion, water scarcity, and biodiversity decline, further exacerbated by climate change. These challenges significantly risk groundwater availability and increase the likelihood of natural hazards such as subsidence, landslides, and flooding. This study quantitatively maps the spatial distribution of subsidence in urban and agricultural settings by utilising Differential Interferometric Synthetic Aperture Radar (DInSAR) and Persistent Scatter Interferometric Synthetic Aperture Radar (PSI) techniques with ascending Sentinel-1 satellite data. We analysed 55 pairs of images with DInSAR and 142 pairs with PSI from March 2017 to October 2022, focusing on five target locations for DInSAR and urban Dhaka for PSI. Findings reveal consistent subsidence in urban Dhaka at an average rate of 16 mm/year, along with semi-seasonal subsidence variability in five agricultural locations. Specific rates are 7 mm/year in Dhaka, 8 mm/year in both Rajshahi and Mymensingh, and 9 mm/year in Rangpur. Sylhet subsides at a rate of 5 mm/year, potentially linked to the fold and thrust belt and the Dauki Fault. Our research highlights the significant environmental impacts of human activities like groundwater withdrawal and land-use changes, which contribute to subsidence and groundwater depletion via the Bengal Water Machine. While further study is required to comprehensively understand the relationship between LOS indicated subsidence rates, geological factors, and geomorphological changes, our findings offer crucial insights into the current impacts of climate change and ongoing environmental degradation in the region.

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来源期刊
Geological Journal
Geological Journal 地学-地球科学综合
CiteScore
4.20
自引率
11.10%
发文量
269
审稿时长
3 months
期刊介绍: In recent years there has been a growth of specialist journals within geological sciences. Nevertheless, there is an important role for a journal of an interdisciplinary kind. Traditionally, GEOLOGICAL JOURNAL has been such a journal and continues in its aim of promoting interest in all branches of the Geological Sciences, through publication of original research papers and review articles. The journal publishes Special Issues with a common theme or regional coverage e.g. Chinese Dinosaurs; Tectonics of the Eastern Mediterranean, Triassic basins of the Central and North Atlantic Borderlands). These are extensively cited. The Journal has a particular interest in publishing papers on regional case studies from any global locality which have conclusions of general interest. Such papers may emphasize aspects across the full spectrum of geological sciences.
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