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1.
抽取地下水进行农业灌溉是导致地下水位快速下降的重要因素,而长期过度开采地下水往往会引发地面沉降灾害,这种现象在干旱和半干旱地区非常普遍。为了研究农业灌溉超采引发的地表形变特征和演化规律,本文以准噶尔盆地南缘、天山北麓地带为研究区域,利用SBAS-InSAR技术对2003年—2009年覆盖呼图壁县的ENVISAT/ASAR升、降轨数据进行处理,获取了该地区的地表形变场,并结合研究区的农业灌溉方式、水资源补给和季节变化等资料对地面沉降的时空变化特征进行分析,为水资源和农业可持续发展提供参考意义。实验表明,研究区内主要有两个沉降幅度较大的漏斗,且都位于农田区域。2007年以前,研究区地表没有显著形变,之后发生了较大量级的沉降。采用传统灌溉方式和时针式灌溉系统的农业区平均沉降速率最高分别可达50 mm/a和30 mm/a,前者在时间上呈线性变化,而后者具有显著的周期性变化特征。在冬季时,采用时针式灌溉系统的地区地面抬升量可达40 mm,远大于传统灌溉方式的农田区域,而夏季地面沉降速率可达200 mm/a。对研究区农业灌溉活动进行分析后发现,农业灌溉造成的地下水超采是该地区地面沉降的主要影响因素,其形变机制与季节变化具有较高的相关性,在灌溉活动休止期内地表形变取决于地下水的补给量。研究区内的形变特征和影响因素分析将为地下水资源的充分利用和农业的可持续发展提供有效的信息。 相似文献
2.
Yuan Si Beibei Chen Huili Gong Mingliang Gao 《Journal of the Indian Society of Remote Sensing》2018,46(10):1657-1665
Human activities have a large impact on land subsidence in great metropolitan areas. In this study, the RADARSAT-2 observation data over a 4-year period (from November 2010 to September 2014) is used to investigate the trends of land subsidence in the eastern Chaoyang District in Beijing, China, and to analyze the impact of human activities on it. The observation results indicate that the temporal and spatial evolutions trend of land subsidence in this area is uneven, with deformation rates ranging from ??116.52 to 7.1 mm/year. There are two large subsidence areas located in the northern part of the study area, and we find that the groundwater exploitation and deformation rates are strongly linearly correlated. The effect of construction on land subsidence has also been investigated. Over time, land subsidence is generally increased in the study area, with an exception at the Longfor Changying Galleria area, which is under construction during the observation period. Based on the time-series analysis of permanent scattered points in the 200 m buffer area, construction activities are observed to cause both land subsidence and upheaval deformation of the surrounding soil. During the construction period, the displacement of the surrounding soil is disturbed. After completion, the initial displacement of surrounding soil is tended to involve the uplift of the surrounding soil, followed by a gradual subsidence with time. 相似文献
3.
Land subsidence in densely urbanized areas is a global problem that is primarily caused by excessive groundwater withdrawal. The Kathmandu Basin is one such area where subsidence due to groundwater depletion has been a major problem in recent years. Moreover, on 25 April 2015, this basin experienced large crustal movements caused by the Gorkha earthquake (Mw 7.8). Consequently, the effects of earthquake-induced deformation could affect the temporal and spatial nature of anthropogenic subsidence in the basin. However, this effect has not yet been fully studied. In this paper, we applied the SBAS-DInSAR technique to estimate the spatiotemporal displacement of land subsidence in the Kathmandu Basin before and after the Gorkha earthquake, using 16 ALOS-1 Phased Array L-band Synthetic Aperture Radar (PALSAR) images during the pre-seismic period and 26 Sentinel-1 A/B SAR images during the pre- and post-seismic periods. The results showed that the mean subsidence rate in the central part of the basin was about ?8.2 cm/year before the earthquake. The spatial extents of the subsiding areas were well-correlated with the spatial distributions of the compressible clay layers in the basin. We infer from time-series InSAR analysis that subsidence in the Kathmandu basin could be associated with fluvio-lacustrine (clay) deposits and local hydrogeological conditions. However, after the mainshock, the subsidence rate significantly increased to ?15 and ?12 cm/year during early post-seismic (108 days) and post-seismic (2015–2016) period, respectively. Based on a spatial analysis of the subsidence rate map, the entire basin uplifted during the co-seismic period has started to subside and become stable during the early-post-seismic period. This is because of the elastic rebound of co-seismic deformation. However, interestingly, the localized areas show increased subsidence rates during both the early-post- and post-seismic periods. Therefore, we believe that the large co-seismic deformation experienced in this basin might induce the local subsidence to increase in rate, caused by oscillations of the water table level in the clay layer. 相似文献
4.
5.
Significant structural damages to urban infrastructures caused by compaction of over-exploited aquifers are an important problem in Central Mexico. While the case of Mexico City has been well-documented, insight into land subsidence problems in other cities of Central Mexico is still limited. Among the cities concerned, we present and discuss the cases of five of them, located within the Trans-Mexican Volcanic Belt (TMVB): Toluca, Celaya, Aguascalientes, Morelia, and Queretaro. Applying the SBAS-InSAR method to C-Band RADARSAT-2 data, five high resolution ground motion time-series were produced to monitor the spatio-temporal variations of displacements and fracturing from 2012 to 2014. The study presents recent changes of land subsidence rates along with concordant geological and water data. It aims to provide suggestions to mitigate future damages to infrastructure and to assist in groundwater resources management.Aguascalientes, Celaya, Morelia and Queretaro (respectively in order of decreasing subsidence rates) are typical cases of fault-limited land subsidence of Central Mexico. It occurs as a result of groundwater over-exploitation in lacustrine and alluvial deposits covering highly variable bedrock topography, typical of horst-graben geological settings. Aguascalientes and Toluca show high rates of land subsidence (up to 10 cm/yr), while Celaya and Morelia show lower rates (from 2 to 5 cm/yr). Comparing these results with previous studies, it is inferred that the spatial patterns of land subsidence have changed in the city of Toluca. This change appears to be mainly controlled by the spatial heterogeneity of compressible sediments since no noticeable change occurred in groundwater extraction and related drawdown rates. While land subsidence of up to 8 cm/yr has been reported in the Queretaro Valley before 2011, rates inferior to 1 cm/yr are measured in 2013–2014. The subsidence has been almost entirely mitigated by major changes in the water management practices of the city, i.e., a 122 km long pipeline bringing surface water from an adjacent state allowed to cease pumping in half of the wells. 相似文献
6.
随着城市的扩张,大型城市的郊区逐步成为新的工业生产及居民中心,为满足生产及生活用水需求,地下水被大量开采,进而导致地表沉降。目前对地表沉降的监测多集中在城市区域,城郊的地表沉降较少受到关注。本文提出使用高分辨率永久散射体（PS）雷达盖分干涉（PS-DInSAR）技术对大型城市郊区的沉降进行监测。选取某市城郊为实验区,使用覆盖该区的16幅高分辨率TerraSAR影像为数据进行PS-DIn-SAR沉降建模和解算,获取了谈区大范围的高分辨率沉降信息。谈市效区最大年沉降速度达到62mm/a（即年沉降量）,平均沉降速度为24mm/a。分析表明,该区域的不均匀沉降与地下水的开采密切相关。 相似文献
7.
针对地面沉降与地下水水位变化的内在关系,考虑地面沉降受到自身变化规律的影响,建立基于库伊克变换的地面沉降预测模型,应用该模型对某地区地面沉降统计数据进行模拟预测,有效实现该地区地面沉降与地下水水位以及本身之间的定量模拟,并探讨模型的拟合效果和预测精度。结果表明库伊克模型拟合效果较好,预测精度较高,能较好地反映研究区域的地面沉降变形趋势。 相似文献
8.
Land subsidence lagging quantification in the main exploration aquifer layers in Beijing plain,China
Land subsidence is rapidly developing across the Beijing Plain, China. Long-term intense overexploitation of groundwater is the main reason for land subsidence in Beijing. In this study, an optimized Small Baseline Subset (SBAS) interferometry method was developed to process 46 RADATSAT-2 images from 2011 to 2015 to investigate the spatial and temporal dynamics of land subsidence in the Beijing Plain. The lag time between land subsidence and groundwater exploitation was first analyzed by the Continuous Wavelet Transform (CWT) and Cross Wavelet Transform (XWT) methods Our study found that the maximum subsidence rate reached 141 mm per year. The analysis of the areas and volumes of the annual subsidence rates indicated that the overall deformation trend slowed down from 2011 to 2015. Our results indicate that the subsidence center is always located in the southeast of Chaoyang District from 2011 to 2015. The lag time between the observed subsidence and the groundwater level drops in the main exploration aquifer layers was 0.57–1.76 months. This information is helpful to reveal the mechanism of land subsidence and build hydrogeological model. 相似文献
9.
Excessive groundwater extraction has caused land subsidence in a large rural area located southwest of Tehran, Iran. We used radar images to estimate the temporal and spatial variation in the magnitude of the subsidence. Due to the large perpendicular baselines and rapid temporal decorrelation of the available data, the application of conventional synthetic aperture radar interferometry (InSAR) to monitor the deformation was not possible. Instead, we applied a recently developed Persistent Scatterer InSAR (PSI) method but found that displacements were underestimated in some areas due to high deformation rates that cause temporal aliasing of the signal. We therefore developed a method that combines conventional InSAR and PSI to estimate the high deformation rates in the southwestern Tehran Basin. We used rates estimated from conventional small temporal baseline interferograms to reduce the likelihood of aliasing and then applied PSI to the residual phase. The method was applied to descending and ascending ENVISAT ASAR images spanning from 2003 to 2009. Mean line-of-sight velocities obtained from both orientations that were further decomposed into horizontal and vertical deformation components were highly compatible with each other, indicating the high performance of the applied method. The mean precision of the estimated vertical component is 2.5 mm/yr. We validated our results using measurements from a continuous GPS station located in one of the subsiding areas. The results also compare favourably with levelling data acquired over a different time interval. Finally, we compared the estimated displacements to hydraulic head variations and geologic profiles at several piezometric wells. We found that the geology is the most important factor controlling the subsidence rate in the southwestern Tehran Basin, regardless of the water level decline. 相似文献
10.
地面沉降风险评价对城市公共安全具有重要意义。本文结合InSAR沉降和地质数据对南京河西地面沉降进行风险性分析。首先,利用InSAR技术获取的2012-2016年河西地区的沉降信息,结合软土层厚度、土地利用类型、地面高程和轨道交通分布信息,采用层次分析法建立三级多因子的地面沉降风险评价模型;然后,分析了河西地面沉降灾害风险程度;最后,着重分析了轨道交通的沉降风险。结果表明,河西地面沉降风险空间特征明显,高风险区主要分布于河西北部的江东街道、凤凰街道及莫愁湖街道,面积约6.4 km2,其中地铁2号线地面沉降风险较大。 相似文献
11.
Assessment of groundwater potential zones using GIS technique 总被引：1，自引：0，他引：1
A case study was conducted to find out the groundwater potential zones in Kattakulathur block, Tamil Nadu, India with an aerial
extent of 360.60 km2. The thematic maps such as geology, geomorphology, soil hydrological group, land use / land cover and drainage map were prepared
for the study area. The Digital Elevation Model (DEM) has been generated from the 10 m interval contour lines (which is derived
from SOI, Toposheet 1:25000 scale) and obtained the slope (%) of the study area. The groundwater potential zones were obtained
by overlaying all the thematic maps in terms of weighted overlay methods using the spatial analysis tool in ArcGIS 9.2. During
weighted overlay analysis, the ranking has been given for each individual parameter of each thematic map and weights were
assigned according to the influence such as soil −25%, geomorphology − 25%, land use/land cover −25%, slope − 15%, lineament
− 5% and drainage / streams − 5% and find out the potential zones in terms of good, moderate and poor zones with the area
of 49.70 km2, 261.61 km2 and 46.04 km2 respectively. The potential zone wise study area was overlaid with village boundary map and the village wise groundwater
potential zones with three categories such as good, moderate and poor zones were obtained. This GIS based output result was
validated by conducting field survey by randomly selecting wells in different villages using GPS instruments. The coordinates
of each well location were obtained by GPS and plotted in the GIS platform and it was clearly shown that the well coordinates
were exactly seated with the classified zones. 相似文献
12.
Land subsidence in the Bandung basin, West Java, Indonesia, is characterized based on differential interferometric synthetic aperture radar (DInSAR) and interferometric point target analysis (IPTA). We generated interferograms from 21 ascending SAR images over the period 1 January 2007 to 3 March 2011. The estimated subsidence history shows that subsidence continuously increased reaching a cumulative 45 cm during this period, and the linear subsidence rate reached ∼12 cm/yr. This significant subsidence occurred in the industrial and densely populated residential regions of the Bandung basin where large amounts of groundwater are consumed. However, in several areas the subsidence patterns do not correlate with the distribution of groundwater production wells and mapped aquifer degradation. We conclude that groundwater production controls subsidence, but lithology is a counteracting factor for subsidence in the Bandung basin. Moreover, seasonal trends of nonlinear surface deformations are highly related with the variation of rainfall. They indicate that there is elastic expansion (rebound) of aquifer system response to seasonal-natural recharge during rainy season. 相似文献
13.
高铁沿线施工期间引起地面沉降的因素错综复杂、相互影响,本文提出通过对沉降区域地下水位、孔隙水压力等进行分层观测,根据分层观测得到地下水位变化、孔隙水压力变化等数据,并采用回归分析法构建了沉降区域地面沉降与诸影响因子的关联模型,通过对郑徐客运专线开封段进行的地面沉降监测量与同时采用二等精密水准测量得到的监测点沉降量进行对比分析,结果表明本方法的有效性和可靠性。 相似文献
14.
本文以京雄城际铁路河北段固安站至雄安站沿线作为研究区,利用2018—2020年共34景Sentinel-1B影像,基于小基线集雷达干涉测量技术(SBAS-InSAR)获取京雄城际铁路河北段沿线的地面沉降时空分布信息,结合空间自相关分析方法,揭示研究区地面沉降的空间分布格局,并对沉降原因进行初步分析。研究结果表明,京雄城际铁路河北段沿线地面沉降发展由北向南存在一定的差异。北部年均沉降速率小于10 mm/a,南部沉降较为严重,最大年均沉降速率达-105.6 mm/a,且沿线西部年均沉降速率高于东部区域。通过分析影响因素得知,地面沉降量与地下水埋深值存在相关性,地下水埋深高的地区地面沉降量较高。同时结合研究区土地利用变化结果发现,城市化建设所产生的静载荷对京雄城际铁路沿线的地面沉降产生一定的影响。 相似文献
15.
利用GPS监测地面沉降的精度分析 总被引：6，自引：5，他引：1
为了监测天津地区的地面沉降,配合精密水准测量,1995年布设了一个GPS监测网,每年的10-11月进行一次精密GPS测量,并与同期进行的精密水准复测的垂直形变结果进行比较研究。根据1995-2004连续十年GPS大地高与精密水准测量观测数据对比研究,验证了GPS监测地面沉降的精度,从理论和实践上论证了GPS大地高变化完全可以像精密水准测量一样高精度获取水准测量点的沉降值,从而得出在地面沉降监测中GPS测量可用于监测地面沉降的结论。 相似文献
16.
为了研究监测西安地区地面沉降与地裂缝灾害的变化情况,建立了该地区高精度GPS监测网.着重介绍了该GPS监测网设计方案和外业观测方法,并对内业数据处理中的关键技术进行了深入研究,提出了一套适用于大城市地面沉降与地裂缝灾害监测的作业方法和数据处理方案.通过西安地区地面沉降和地裂缝的GPS监测实践,验证了本文提出的监测网的布设原则、GPS外业施测和内业数据处理方案是切实可行的,并且通过GPS监测获取了西安地面沉降和地裂缝近期活动的有关数据信息,获得了与精密水准结果与地质资料具有较好一致性的结果. 相似文献
17.
ABSTRACTOver-exploitation of groundwater has caused severe land subsidence in Beijing during the past two decades. Since the middle route of South-to-North Water Diversion Project (SNWDP), the biggest water diversion project in China, started to deliver water to Beijing in December 2014, the groundwater shortage has been greatly alleviated. This study aims to analyze the impact of SNWDP on the spatiotemporal evolution of land subsidence in Beijing. Change in surface displacement in Beijing after SNWDP was retrieved and the spatiotemporal patterns of the change were analyzed based on long time-series Envisat Advanced Synthetic Aperture Radar (ASAR) (2004–2010), Radarsat-2 (2011–2014), and Sentinel-1 (2015–2017) satellite datasets using Permanent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) techniques. Land subsidence unevenness index (LSUI) was proposed to represent the spatial unevenness of surface displacement. PS-Time approach was then adapted to examine the time series evolution of LSUI. The results showed that the InSAR measurements agree well with leveling measurements with R2 over 0.96. Although the maximum annual displacement rate reached ?159.7 mm/year by 2017, over 57% of the area within 25 mm/year contour line showed decreasing or unchanged displacement rate after the south-north water delivered to Beijing. The settlement rate in Chaoyang-Dongbalizhuang (CD) subsidence center has decreased for 26 mm/year from 2011–2014 to 2015–2017. Only around 15% of the area experienced continued accelerating settlement rate through the three time periods, which was mainly located in the area with the compressible layer thickness over 190 m, while the magnitude of velocity increment considerably decreased after SNWDP. Land subsidence unevenness, represented by LSUI, developed more slowly after SNWDP than that during 2011–2014. However, LSUI at the edge of settlement funnel has kept developing and reached 1.7‰ in 2017. Decreasing groundwater level decline after SNWDP and the positive relationship (R2 > 0.74) between land subsidence and groundwater level clearly showed impacts of SNWDP on the alleviating land subsidence. Other reasons include geological background, increasing precipitation, and strict water management policies implemented during these years. 相似文献
18.
介绍了GPS用于天津市地面沉降监测的方案,通过GPS监测数据与水准测量结果对比分析,说明了两者地面沉降趋势的一致性,GPS用于地面沉降监测可以逐步取代传统水准观测。 相似文献
19.
Maryam Dehghani Mohammad Javad Valadan Zoej Sassan Saatchi Juliet Biggs Barry Parsons Tim Wright 《Journal of the Indian Society of Remote Sensing》2009,37(1):147-156
A large agricultural area located in 20 km north of the city of Mashhad in the north-east of Iran is subject to land subsidence.
The subsidence rate was achieved in a couple of sparse points by precise leveling between 1995 and 2005, and continuous GPS
measurements obtained from 2005 to 2006. In order to study the temporal behavior of the deformation in high spatial resolution,
the small baseline subset (SBAS) algorithm was used to generate the interferometric SAR time series analysis. Time series
analysis was performed using 19 interferograms calculated from 12 ENVISAT ASAR data spanning between 2003 and 2006. The time
series results exhibited that the area is subsiding continuously without a significant seasonal effect. Mean LOS deformation
velocity map obtained from time series analysis demonstrated a considerable subsidence rate up to 24 (cm/yr). In order to
evaluate the time series analysis results, continuous GPS measurements as a geodetic approach were applied. The comparisons
showed a great agreement between interferometry results and geodetic technique. Moreover, the information of various piezometric
wells distributed in the area corresponding to 1995 to 2005 showed a significant decline in water table up to 20 meters. The
correlation between the piezometric information and the surface deformation at well’s locations showed that the subsidence
occurrence in Mashhad is due to the excess groundwater withdrawal. 相似文献
20.
浅谈基于InSAR的南票煤矿开采沉陷区沉降量外业检核 总被引：1，自引：0，他引：1
仇国军 《测绘与空间地理信息》2015,(4):203-204
经过时间序列InSAR技术处理后,得到监测时间段内南票区的地面形变平均速率、累计形变量、时间序列形变量,确定沉降区域。本文通过南票煤矿开采沉陷区基岩点、基本水准点、监测点布设以及这些点测量工作,提出山区采用水准测量和GPS测量联合方法,实现沉陷区沉降量核查。 相似文献