نتایج جستجو برای: soil subsidence

تعداد نتایج: 185226  

2005
Donald R. Cahoon

The ability of coastal wetlands to keep pace with sea-level rise through vertical accretion and transgression onto adjacent upslope habitats was examined for the following coastal habitats in the southeastern United States: low salt marsh, high salt marsh, brackish marsh, and mangrove forests (fringe, basin, and overwash islands). The relationship between vertical accretion and soil elevation c...

The earth's surface, due to its natural conditions and its structure is always changing and reshaping. One of the created deformations is the land subsidence. This is the most dangerous events which can be seen in most urban areas especially in the agricultural plains today. This study aims at zoning land subsidence and recognition of geometrical factors in southwest of Tehran. To estimate and ...

Journal: :Journal of spine surgery 2017
Prashanth J Rao Kevin Phan Gloria Giang Monish M Maharaj Steven Phan Ralph J Mobbs

BACKGROUND Anterior lumbar interbody fusion (ALIF) is a widely used surgical technique for disorders of the lumbar spine. One potential complication is the subsidence of disc height in the post-operative period. Few studies have reported the rate of subsidence in ALIF surgery prospectively. We prospectively evaluated the rate of subsidence in adult patients undergoing ALIF. METHODS Results we...

Journal: :Remote Sensing 2015
Ho Tong Minh Dinh Le Van Trung Thuy Le Toan

The rapidly developing urbanization since the last decade of the 20th century has led to extensive groundwater extraction, resulting in subsidence in Ho Chi Minh City, Vietnam. Recent advances in multi-temporal spaceborne SAR interferometry, especially with a persistent scatters interferometry (PSI) approach, has made this a robust remote sensing technique for measuring large-scale ground subsi...

2016
Cheinway Hwang Yuande Yang Ricky Kao Jiancheng Han C. K. Shum Devin L. Galloway Michelle Sneed Wei-Chia Hung Yung-Sheng Cheng Fei Li

Contemporary applications of radar altimetry include sea-level rise, ocean circulation, marine gravity, and icesheet elevation change. Unlike InSAR and GNSS, which are widely used to map surface deformation, altimetry is neither reliant on highly temporally-correlated ground features nor as limited by the available spatial coverage, and can provide long-term temporal subsidence monitoring capab...

2008
Sonja Spasojević Lijun Liu Michael Gurnis Dietmar Müller

[1] The dynamic subsidence of the United States east coast is addressed using the discrepancy between regional and global estimates of sea level, elevation of paleoshorelines, and adjoint models of mantle convection that assimilate plate motions and seismic tomography. The positions of Eocene and Miocene paleoshorelines are lower than predicted by global sea levels, suggesting at least 50 m, an...

Journal: :Frontiers for Young Minds 2022

Across the Sacramento-San Joaquin Delta, spongy soil is sinking at a rapid rate! This issue, known as subsidence, happens in places with peat soils that have been drained. Peat are created over thousands of years by decaying wetland plants. Following European colonization California, Delta’s wetlands and their were drained, levees built to keep land dry. Farms now thrive on this fertile landsca...

Geographical extent, increasing intensity and the trend of adding new areas are the challenges of researchers and managers in the face of subsidence crisis due to the withdrawal of groundwater resources in Iran. To these challenges must be added secondary crises such as social, security, food and health consequences. In this regard, the importance of continuous and accurate monitoring in the ...

2014
X.-M. Zeng B. Wang Y. Zhang S. Song X. Huang Y. Zheng C. Chen G. Wang

Using a succession of 24 h Weather Research and Forecasting model (WRF) simulations, we investigate the sensitivity to initial soil moisture of a short-range hightemperature weather event that occurred in late July 2003 in East China. The initial soil moisture (SMOIS) in the Noah land surface scheme is adjusted (relative to the control run, CTL) for four groups of simulations: DRY25 (−25 %), DR...

2015
Dana R. N. Brown M. Torre Jorgenson Thomas A. Douglas Vladimir E. Romanovsky Knut Kielland Christopher Hiemstra Eugenie S. Euskirchen Roger W. Ruess

We examined the effects of fire disturbance on permafrost degradation and thaw settlement across a series of wildfires (from ~1930 to 2010) in the forested areas of collapse-scar bog complexes in the Tanana Flats lowland of interior Alaska. Field measurements were combined with numerical modeling of soil thermal dynamics to assess the roles of fire severity and climate history in postfire perma...

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