نتایج جستجو برای: soil subsidence

تعداد نتایج: 185226  

2000
B. O. M. Dirks

Eddy correlation measurements of CO2 exchange (F) were made in intensively managed peat pastures at 2 different groundwater tables during most of a growing season. F was separated into a respiratory (Fr) and an assimilatory (Fa) CO2 flux. The fit of the Arrhenius temperature response to Fr showed that Fr was generally higher at low groundwater tables. The fit of a hyperbolic irradiance response...

Journal: :Remote Sensing 2017
Lv Zhou Jiming Guo Jiyuan Hu Jiangwei Li Yongfeng Xu Yuanjin Pan Miao Shi

The Terrain Observation with Progressive Scans (TOPS) acquisition mode of Sentinel-1A provides a wide coverage per acquisition and features a repeat cycle of 12 days, making this acquisition mode attractive for surface subsidence monitoring. A few studies have analyzed wide-coverage surface subsidence of Wuhan based on Sentinel-1A data. In this study, we investigated wide-area surface subsidenc...

2014
Lin Liu Elchin E. Jafarov Kevin M. Schaefer Benjamin M. Jones Howard A. Zebker Christopher A. Williams John Rogan Tingjun Zhang

Wildfire is a major disturbance in the Arctic tundra and boreal forests, having a significant impact on soil hydrology, carbon cycling, and permafrost dynamics. This study explores the use of the microwave Interferometric Synthetic Aperture Radar (InSAR) technique to map and quantify ground surface subsidence caused by the Anaktuvuk River fire on the North Slope of Alaska. We detected an increa...

Journal: :Remote Sensing 2015
Wei-Chen Hsu Hung-Cheng Chang Kuan-Tsung Chang En-Kai Lin Jin-King Liu Yuei-An Liou

Land subsidence is a worldwide problem that is typically caused by human activities, primarily the removal of groundwater. In Western Taiwan, groundwater has been pumped for industrial, residential, agricultural, and aquacultural uses for over 40 years. In this study, a multisensor monitoring system comprising GPS stations, leveling surveys, monitoring wells, and Persistent Scatterer Interferom...

Journal: :E3S web of conferences 2021

The article considers study of influence coefficient k sl on subsidence value. In course study, it was revealed that , determined according to normative documents Russian Federation, has a limited scope and does not always lead sufficiently satisfactory theoretically justified results. this article, range pressures the bases up 500 kPa been investigated. This makes possible take into account re...

Journal: :Journal of microbiology and biotechnology 2014
Yuanyuan Li Longqian Chen Hongyu Wen Tianjian Zhou Ting Zhang Xiali Gao

Significant alteration in the microbial community can occur across reclamation areas suffering subsidence from mining. A reclamation site undergoing fertilization practices and an adjacent coal-excavated subsidence site (sites A and B, respectively) were examined to characterize the bacterial diversity using 454 high-throughput 16S rDNA sequencing. The dominant taxonomic groups in both the site...

Journal: :Remote Sensing 2017
Matthew North Timothy S. Farewell Stephen H. Hallett Audrey Bertelle

Road and rail networks provide critical support for society, yet they can be degraded by seasonal soil movements. Currently, few transport network operators monitor small-scale soil movement, but understanding the conditions contributing to infrastructure failure can improve network resilience. Persistent Scatterers Interferometry (PSI) is a remote sensing technique offering the potential for n...

Journal: : 2023

The application of methods improvement ground bases in subsidence areas is an urgent issue today. This evidenced by the continuing difficulties with operation transport structures. study presents experimental studies soil reinforcement. An important factor to determine properties soil, so paper results laboratory tests. angle internal friction and deformation increases a greater extent when rei...

2009

Historically, the Everglades Agricultural Area (EAA) evolved under seasonally-flooded conditions that predominately supported sawgrass and other wetland vegetation. Over several thousand years, Histosol “muck” soils were deposited as organic matter accumulated above the limestone (calcium carbonate) bedrock. In the early 1900s, these soils were drained. Declining water table levels coupled with...

ژورنال: علوم زمین 2020

When a tunnel passes through weak soil with different conditions, or there is a thin layer of soil on top of the tunnel, the mass of soil or rock must be stabilized. In addition, an excavation method must be chosen and applied in order to control the amount of subsidence and convergence which are among the most significant factors in excavation a tunnel especially in urban area, since the soil ...

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