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浊水溪冲积扇为台湾目前最严重的地层下陷区,已设置包括DInSAR、GPS、水准测量、磁环分层式监测井与地下水位井等多元监测系统。大范围监测地层下陷方法中的水准测量有取样性不足之缺点,而DInSAR也易受相位不相关与大气误差影响而致精度降低。本研究利用2006~2008年期间共20幅ENVISAT卫星影像,搭配PSI技术,有效降低DInSAR的误差影响,同时获得107.6像素/km2的取样密度,弥补了水准测量取样密度仅0.2个/km2的取样性不足,透过295个监测点交叉验证,PSI与水准测量的成果显示两者的均方根误差为0.6cm。本研究亦发展了资料融合方法,有效结合水准测量与PSI成果,实验结果显示融合后的成果更能精确展现下陷的范围与下陷中心的变化,同时该成果与水准测量之均方根误差降至0.4cm。 相似文献
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Natural and man-made disasters like earthquakes, landslides, avalanches, unplanned mining are some of the most serious factors responsible for earth surface displacement. These incidences can be harmful for the society due to loss of life and also threatful for future urban development. Therefore, continuous monitoring of disasters in terms of displacements is of fundamental importance in a modern well-organized society to understand its effects on the social and economic fabric. Availability of SAR data has been proved to be an excellent source for estimation of surface displacements with high accuracies. However, in India, SAR interferometry-related displacement measurement has still not gained appreciable momentum. More rigorous research needs to be carried out for the efficient use of this new generation technique. This review article is an attempt to discuss the issues related to SAR-based displacement studies so far conducted on Indian Himalayan region and possible advanced alternatives. 相似文献
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结合DIn SAR与World View-2光学遥感解译技术,对研究区进行多源数据处理,提取研究地区的煤矿塌陷区信息,然后对处理后的两种结果进行对比。二者既有区别,又可以互补,最终在研究区形成完整的塌陷区信息。 相似文献
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本文针对2010年4月14日玉树地震引起的地表形变,使用日本ALOS卫星PALSAR L波段雷达影像数据,应用两轨雷达差分干涉(DInSAR)处理得到了以玉树为中心11 000km2范围内的同震形变场,空间分辨率为8m,并在此基础上对玉树地震的震源机制和发震机理进行了分析。研究结果表明L波段雷达数据适合在地形起伏较大的地区进行DInSAR形变探测。该同震形变场信息可为玉树地震的同震形变反演提供参考数据。该研究进一步证实DInSAR技术在大规模地表形变探测和地学研究领域具有广阔的应用前景。 相似文献
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利用大地测量数据研究2019年6月17日四川长宁MS6.0地震同震形变场特征和发震断层参数, 基于DInSAR技术处理升降轨Sentinel-1A数据获取干涉相位图, 并考虑大气折射效应和余震形变误差实现同震形变场改正。四叉树采样后的形变数据作为反演数据源, 采用弹性半空间分层模型反演发震断层几何面滑动分布。结果表明本次地震发震机制为兼具逆冲和左旋走滑, 矩震级为MW5.9, 断层破裂尺度达28 km×20 km, 震源深度约9.4 km。升降轨视线向同震形变场在断层两侧呈现形变特征差异, 最大沉降量分别是8.34 cm(升轨)和4.23 cm(降轨), 最大抬升量分别是5.5 cm(升轨)和7.5 cm(降轨); 发震断层走向为302°, 倾角为43°, 平均滑动角为50°, 断层面最大滑动量达到0.28 m。 相似文献
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Lithological control of land subsidence induced by groundwater withdrawal in new urban AREAS (Granada Basin,SE Spain). Multiband DInSAR monitoring 
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下载免费PDF全文 Davide Notti Rosa María Mateos Oriol Monserrat Nùria Devanthéry Tomás Peinado Francisco Javier Roldán Francisca Fernández‐Chacón Jorge Pedro Galve Francisco Lamas Jose Miguel Azañón 《水文研究》2016,30(13):2317-2331
Ground subsidence in the southeastern border of the Granada Basin (SE Spain) has been studied using remote sensing techniques. Over the last decades, the region has experienced a huge urban expansion, which has caused a substantial increase in water supply requirements. Water needs are exclusively met by groundwater by means of numerous pumping wells, which exploit a confined detrital aquifer of alluvial fan deposits with a heterogeneous facies distribution. A general piezometric level decline (up to 50 m) has been recorded in the aquifer during the past 30 years that has induced the generation of a subsiding area with oval shape oriented WNW‐ESE just where the new urban areas and pumping wells are located. Subsidence has been monitored by exploiting synthetic aperture radar (SAR) images from ENVISAT (2003–2009) and Cosmo‐SkyMed (2011–2014). A new approach, which combines A‐DInSAR and small‐area persistent scatterer interferometry (PSI) analysis, has been applied obtaining a good accuracy regarding temporal and spatial dimension of the subsidence. ENVISAT data (2003–2009) reveal subsidence rates up to 10–15 mm/year, and Cosmo‐SkyMed (2011–2014) values slightly lower; up to 10 mm/year. Temporal variations in the subsidence velocity are in accordance with the rainfall pattern and piezometric fluctuations in the aquifer. The sector with highest rates of subsidence does not correspond to the area with more intense groundwater exploitation but to the area with greater presence of clays in the confining layer of the aquifer. There is a clear lithological control in the spatial distribution of the ground subsidence. This work integrates detailed geological and hydrogeological data with differential SAR interferometry monitoring with the aim to better understand subsidence processes in detrital aquifers with small‐scale heterogeneity. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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提出一种矿山地表时序三维多量级形变重建方法。首先利用单轨道OT和DInSAR技术提取LOS向非连续的多量级形变;再结合形变先验融合模型和概率积分法构建矿山三维多量级形变重建模型;最后以神东大柳塔矿山52303工作面为研究对象,对覆盖研究区的6对高分辨率TerraSAR-X数据进行时序处理,获取长时间序列的矿山地表三维多量级形变监测结果。与水准测量结果对比发现,该方法与水准测量结果形变趋势一致,垂直向、东西向和南北向的均方根误差（RMSE）分别小于0.188 0 m、0.224 3 m和0.207 4 m。该方法不仅能准确测量矿山地表三维多量级形变,还能精细反演矿山地表沉降漏斗边缘到中心的形变特征。 相似文献
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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
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通过研究时序DInSAR相位模型,利用振幅离差、时间相干系数和统计分析多重方法提取了相干点目标,并根据不同相位分量的时空特性分离出形变相位,继而提取出相干点目标上的沉降速率。以上海市临港新城主城区为实验区,利用24景Envisat ASAR影像,得到了2007-10～2010-02间的沉降速率分布,并分析了冲填土年代对沉降的影响。 相似文献