气候变化领域集成服务门户(CCPortal): Over a Century of Sinking in Mexico City: No Hope for Significant Elevation and Storage Capacity Recovery

CCPortal

DOI	10.1029/2020JB020648
	Over a Century of Sinking in Mexico City: No Hope for Significant Elevation and Storage Capacity Recovery
	Chaussard E.; Havazli E.; Fattahi H.; Cabral-Cano E.; Solano-Rojas D.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	Many areas worldwide are known to experience land subsidence due to groundwater extraction. It is traditionally assumed that subsidence extent and rates are controlled by groundwater extraction locations and volumes. Here, we reevaluate this assumption in the Mexico City metropolitan area by combining stratigraphic, hydrologic, geodetic, and demographic datasets. Integration of 115 years of leveling with 24 years of Interferometric Synthetic Aperture Radar (InSAR) and 14 years of GPS data reveals that subsidence rates have been mostly constant in Mexico City since at least 1950 and reach 50 cm/year. Analysis of InSAR and GPS data shows that no significant elastic deformation exists, demonstrating that the subsidence is almost fully irreversible. In Mexico City, no direct relationships exist between groundwater level fluctuations and subsidence rates or between pumping rates and subsidence rates. In contrast, a strong positive linear relationship is isolated between subsidence rates and the thickness of the upper aquitard. Through the integration of these long-term datasets, we forecast that it will take ∼150 years to reach total compaction of the upper aquitard, which may lead to additional subsidence up to 30 m. With the potentiometric surface now deeper than most of the aquitard, clay's porewater rich in salts, chemical constituents, and pollutants is now flowing downward into the productive aquifer, hence decreasing water quality. Finally, our work shows that the consequences of land subsidence greatly influence the socioeconomic landscape in the Mexico City metropolitan area. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	deformation; InSAR; Mexico City; subsidence; water; water crisis
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187224
作者单位	Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Instituto de Geofísica, Universidad Nacional Autónoma de México, México CDMX, Mexico; División de Ingeniería en Ciencias de la Tierra, Facultad de Ingeniería, Universidad Nacional Autónoma de México, México CDMX, Mexico
推荐引用方式 GB/T 7714	Chaussard E.,Havazli E.,Fattahi H.,et al. Over a Century of Sinking in Mexico City: No Hope for Significant Elevation and Storage Capacity Recovery[J],2021,126(4).
APA	Chaussard E.,Havazli E.,Fattahi H.,Cabral-Cano E.,&Solano-Rojas D..(2021).Over a Century of Sinking in Mexico City: No Hope for Significant Elevation and Storage Capacity Recovery.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Chaussard E.,et al."Over a Century of Sinking in Mexico City: No Hope for Significant Elevation and Storage Capacity Recovery".Journal of Geophysical Research: Solid Earth 126.4(2021).