scholarly journals Is There Deep-Seated Subsidence in the Houston-Galveston Area?

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jiangbo Yu ◽  
Guoquan Wang ◽  
Timothy J. Kearns ◽  
Linqiang Yang
Keyword(s):  
Land Subsidence ◽  
Groundwater Level ◽  
Land Surface ◽  
The Past ◽  
Subsidence Rate ◽  
Different Depths ◽  
Subsidence Monitoring ◽  
Near Future ◽  
Land Subsidence Rate

Long-term continuous groundwater level and land subsidence monitoring in the Houston-Galveston area indicates that, during the past two decades (1993–2012), the groundwater head has been increasing and the overall land subsidence rate has been decreasing. Assuming that the hydraulic head in the aquifer will reach or exceed the preconsolidation level in the near future, will subsidence in the Houston-Galveston area eventually cease? The key to answer this question is to identify if there is deep-seated subsidence in this area. This study investigated the recent subsidence observed at different depths in the Houston-Galveston area. The subsidence was recorded by using 13 borehole extensometers and 76 GPS antennas. Four of the GPS antennas are mounted on the deep-anchored inner pipes of borehole extensometers. We conclude that recent subsidence (1993–2012) in the Houston-Galveston area was dominated by the compaction of sediments within 600 m below the land surface. Depending on the location of specific sites, the compaction occurred within the Chicot aquifer and part or all of the Evangeline aquifer. No measurable compaction was observed within the Jasper aquifer or within deeper strata. Deep-seated subsidence is not likely occurring in the Houston-Galveston area.

scholarly journals Land subsidence detection in Jakarta Province using Sentinel-1A Satellite Imagery

2021 ◽  
Vol 944 (1) ◽  
pp. 012036
Author(s):  
D Situmorang ◽  
R E Arhatin ◽  
J Lumban-Gaol
Keyword(s):  
Satellite Imagery ◽  
Land Subsidence ◽  
Land Surface ◽  
Satellite Images ◽  
Coastal Areas ◽  
Natural Processes ◽  
Subsidence Rate ◽  
A Value ◽  
Alluvial Deposition ◽  
Land Subsidence Rate

Abstract The land surface in Jakarta Province is thought to have experienced relatively continuous subsidence because of natural processes and artificial activities. This research was carried out to evaluate the rate of land subsidence in Jakarta Province. Based on this research, it can be shown from the Sentinel-1A satellite images that there has been landed subsidence. The data used are two pairs of Sentinel-1A Single Looking Complex (SLC) images acquired in 2019 and 2020. The data was processed using the DInSAR method to examine the rate of land subsidence. The results show that the land subsidence rate in Jakarta Province during the 2019-2020 period varies from 1.8 cm to -10.7 cm/year. The literature data results in 2016 experienced a decrease in land subsidence with a significant value of -12.6 cm/year. Land subsidence in 2017 averaged -1.8 cm/year. The land subsidence results from 2019 to 2020 have a value that tends to be lower than in 2016 of - 3.62 cm/year. Land subsidence occurs mostly in coastal areas and near estuaries caused by the nature of alluvial deposition materials. It has caused damages to road infrastructure in several regions of Jakarta Province, such as Mutiara Beach, West Cengkareng, and Pademangan.

Land Subsidence Detection in Jakarta Province Using Sentinel-1A Satellite Imagery

2021 ◽  
Author(s):  
David Situmorang ◽  
Risti Endrani Arhatin ◽  
Jonson Lumban-Gaol ◽  
Devyan Meisnnehr
Keyword(s):  
Satellite Imagery ◽  
Land Subsidence ◽  
Land Surface ◽  
Coastal Areas ◽  
Natural Processes ◽  
Subsidence Rate ◽  
Alluvial Deposition ◽  
Level 1 ◽  
The City ◽  
Land Subsidence Rate

<p>The land surface in DKI Jakarta Province is thought to have experienced relatively continuous subsidence because of natural processes and man-made activities. This research was carried out to evaluate the rate of land subsidence in Jakarta Province. The data used in this study are two pairs of Sentinel-1A level 1 Single Looking Complex (SLC) images which were acquired in 2019 and 2020. The data was processed using the DInSAR method to examine the rate of land subsidence.  The results show that the land subsidence rate in Jakarta Province during the 2019-2020 period varies from 1.8 cm to -10.7 cm/year. From 2019 to 2020, the average land subsidence in the City of North Jakarta is around –4.9 cm/year, East Jakarta is around –2.5 cm/year, West Jakarta is around –4.8 cm/year, Central Jakarta is around –3.1 cm/year, and South Jakarta about –2.8 cm/year. Land subsidence occurs mostly in coastal areas and near estuaries caused by the nature of alluvial deposition materials. It has caused damages to road infrastructure in several regions of Jakarta Province, such as Mutiara Beach, West Cengkareng, and Pademangan.</p><p> </p><p>Keywords: coastal areas, DInSAR, land subsidence, satellite imagery, Sentinel-1A</p>

scholarly journals Introduction to GPS geodetic infrastructure for land subsidence monitoring in Houston, Texas, USA

2015 ◽  
Vol 372 ◽  
pp. 297-303 ◽  
Author(s):  
G. Wang ◽  
J. Welch ◽  
T. J. Kearns ◽  
L. Yang ◽  
J. Serna Jr.
Keyword(s):  
Reference Frame ◽  
Metropolitan Area ◽  
Land Subsidence ◽  
Groundwater Level ◽  
High Accuracy ◽  
Gps Technology ◽  
The Past ◽  
Software Packages ◽  
Subsidence Monitoring ◽  
Houston Metropolitan Area

Abstract. Houston, Texas is one of the places that first employed high-accuracy GPS technology for land subsidence monitoring beginning in the late 1980s. Currently, there are over 170 permanent GPS stations located in the Houston metropolitan area. This article summarizes the current GPS geodetic infrastructure in the Houston metropolitan area, which is comprised of three components: a dense GPS network with 170 permanent stations, a stable Houston reference frame (SHRF14), and sophisticated software packages for post positioning processing. Average land subsidence and groundwater-level altitude changes during the past 10 years (2005–2014) also are presented in this paper.

Visualizing uncertainty of one-dimensional land subsidence prediction by preparing various local optimal solutions with a genetic algorithm

2021 ◽  
Author(s):  
Kento Akitaya ◽  
Masaatsu Aichi
Keyword(s):  
Genetic Algorithm ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Physical Property ◽  
Optimal Solutions ◽  
Groundwater Level Fluctuations ◽  
Subsidence Prediction ◽  
Subsidence Monitoring ◽  
Inversion Analysis

<p>This study tried to visualize the predictive uncertainty while predicting future land subsidence caused by the groundwater pumping. Because land subsidence modeling is highly uncertain, it is impossible to determine the distribution of subsurface physical property values uniquely. Therefore, we prepared various local optimal solutions through the inversion analysis with a genetic algorithm in order to visualize land subsidence prediction uncertainty. The inversion analysis was conducted using the long-term land subsidence monitoring data at Kawajima in the Kanto Plain, Japan. In this study site, the seasonal groundwater level fluctuations have caused plastic compaction in summer and elastic expansion in winter every year. Obtained multiple sets of subsurface properties were within the range of typical values in the existing literature and satisfactorily reproduced the observed subsidence, showing that the inversion analysis worked well. In addition, the groundwater level scenario analysis was conducted using obtained property sets. This revealed that the subsidences predicted for a sudden groundwater level drop and rapid recovery scenario are more volatile than the subsidences predicted for the stable scenario. This means that it is important to have multiple sets of subsurface properties to predict future land subsidence caused by unprecedented groundwater level fluctuations.</p>

scholarly journals LAND SUBSIDENCE MONITORING ON THE UNDERGROUND MRT CONSTRUCTION AREA IN JAKARTA, INDONESIA

2020 ◽  
Vol 14 (2) ◽  
pp. 190
Author(s):  
Chara Bernike ◽  
Masahiko Nagai ◽  
Takahiro Osawa
Keyword(s):  
Land Subsidence ◽  
Land Surface ◽  
Vertical Movement ◽  
Tectonic Activity ◽  
Geological Condition ◽  
Large Area ◽  
Persistent Scatterer Interferometry ◽  
Alos Palsar ◽  
Subsidence Rate ◽  
Land Subsidence Rate

Space utilization for measurement of the changes of Earth’s surface is an alternative monitoring technique. Covering a large area with better spatial resolution, comparable accuracy and costly low compared with conventional measurement have made SAR technology more popular in monitoring the subsidence. Land subsidence is the vertical movement of the land surface mainly triggered by fluid extraction, load of construction, geological condition, natural compaction or tectonic activity. Previous researchers have found that Jakarta has experienced land subsidence for decades. On the other hand, rapid urban growth and severe congestion problem in Jakarta are also crucial issues. By providing the first MRT subway, it is expected to be solved the congestion problem. Persistent Scatterer Interferometry Synthetic Aperture Radar (PSInSAR) is one of method to identify the deformation with millimeter accuracy. It was perfectly useful for studied on the land subsidence in consequence of the first MRT subway project in Jakarta. The land displacement monitoring along MRT subway trajectory has been acquired by processing Sentinel 1 and ALOS PALSAR-2. This study was able to investigate the land subsidence by using SARPROZ. Finally, the results of this study indicated that land subsidence occurred in the construction area with the lowest land subsidence rate of -0.6 cm/year and the highest land subsidence rate was -7.3 cm/year. Keywords: PSInSAR; subway; land subsidence; MRT.

scholarly journals Acute graft-versus-host disease: a bench-to-bedside update

Blood ◽  
2014 ◽  
Vol 124 (3) ◽  
pp. 363-373 ◽  
Author(s):  
Shernan G. Holtan ◽  
Marcelo Pasquini ◽  
Daniel J. Weisdorf
Keyword(s):  
Small Molecules ◽  
Graft Versus Host Disease ◽  
Host Disease ◽  
Multiple Modalities ◽  
Graft Versus Host ◽  
The Past ◽  
Prevention And Treatment ◽  
Near Future ◽  
Acute Graft

Abstract Over the past 5 years, many novel approaches to early diagnosis, prevention, and treatment of acute graft-versus-host disease (aGVHD) have been translated from the bench to the bedside. In this review, we highlight recent discoveries in the context of current aGVHD care. The most significant innovations that have already reached the clinic are prophylaxis strategies based upon a refinement of our understanding of key sensors, effectors, suppressors of the immune alloreactive response, and the resultant tissue damage from the aGVHD inflammatory cascade. In the near future, aGVHD prevention and treatment will likely involve multiple modalities, including small molecules regulating immunologic checkpoints, enhancement of suppressor cytokines and cellular subsets, modulation of the microbiota, graft manipulation, and other donor-based prophylaxis strategies. Despite long-term efforts, major challenges in treatment of established aGVHD still remain. Resolution of inflammation and facilitation of rapid immune reconstitution in those with only a limited response to corticosteroids is a research arena that remains rife with opportunity and urgent clinical need.

scholarly journals Land subsidence rate analysis of Jakarta Metropolitan Region based on D-InSAR processing of Sentinel data C-Band frequency

2019 ◽  
Vol 1185 ◽  
pp. 012004 ◽  
Author(s):  
Joko Widodo ◽  
Arie Herlambang ◽  
Albertus Sulaiman ◽  
Pakhrur Razi ◽  
Yohandri ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Metropolitan Region ◽  
Band Frequency ◽  
Subsidence Rate ◽  
Rate Analysis ◽  
Land Subsidence Rate

scholarly journals LAND SUBSIDENCE MONITORING USING PS-InSAR TECHNIQUE FOR L-BAND SAR DATA

2016 ◽  
Vol XLI-B7 ◽  
pp. 995-997 ◽  
Author(s):  
S. Thapa ◽  
R. S. Chatterjee ◽  
K. B. Singh ◽  
D. Kumar
Keyword(s):  
Time Series ◽  
Land Subsidence ◽  
Land Surface ◽  
Surface Deformation ◽  
Underground Mining ◽  
Ground Surface ◽  
Sar Interferometry ◽  
Persistent Scatterer Interferometry ◽  
Long Time ◽  
Subsidence Monitoring

Differential SAR-Interferometry (D-InSAR) is one of the potential source to measure land surface motion induced due to underground coal mining. However, this technique has many limitation such as atmospheric in homogeneities, spatial de-correlation, and temporal decorrelation. Persistent Scatterer Interferometry synthetic aperture radar (PS-InSAR) belongs to a family of time series InSAR technique, which utilizes the properties of some of the stable natural and anthropogenic targets which remain coherent over long time period. In this study PS-InSAR technique has been used to monitor land subsidence over selected location of Jharia Coal field which has been correlated with the ground levelling measurement. This time series deformation observed using PS InSAR helped us to understand the nature of the ground surface deformation due to underground mining activity.

scholarly journals Land Subsidence monitoring 2016 - 2018 analysis using GNSS CORS UDIP and DinSAR in Semarang

2019 ◽  
Author(s):  
BD Yuwono ◽  
M Awaluddin ◽  
Najib .
Keyword(s):  
Land Subsidence ◽  
Early Stage ◽  
Base Station ◽  
Capital City ◽  
Maintenance Cost ◽  
Subsidence Rate ◽  
The North ◽  
Gps Observation ◽  
Subsidence Monitoring ◽  
The Impact

Land Subsidence is phenomena likey common and occurred due to natural cause, loading, and geological setting. In the coastal area land subsidence became worse, cause influence by sea-level rise, The impact land subsidence can lead to wider expansion (flooding area called rob), damage or cracking construction/building and large of maintenance cost. Semarang is the capital city in Central Jawa have experienced in land subsidence in several decades. The north of Semarang was reported a higher rate of land subsidence compared with the south. It was believed that the land subsidence areas were affected by young alluvium, ground extraction and a load of the building. To anticipate, land subsidence should be monitored and detected in an early stage. The most effective way of monitoring land subsidence using GPS, DInSAR to evaluate the characteristic of land subsidence. The GPS observation was conducted in 2016 – 2018 using CORS UDIP as a base station and Sentinel Data was conducted to analyzed the subsidence rate in Semarang. The result showed land subsidence rate in several areas was distributed both spatially and temporally.

scholarly journals Groundwater Level Change Management on Control of Land Subsidence Supported by Borehole Extensometer Compaction Measurements in the Houston-Galveston Region, Texas

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 223 ◽  
Author(s):  
Yi Liu ◽  
Jiang Li ◽  
Zheng N. Fang
Keyword(s):  
Change Management ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Land Surface ◽  
Groundwater Withdrawal ◽  
Overburden Pressure ◽  
Groundwater Levels ◽  
Level Change ◽  
Aquifer Systems ◽  
Groundwater Level Change

As much as 3.05 m of land subsidence was observed in 1979 in the Houston-Galveston region as a result primarily of inelastic compaction of aquitards in the Chicot and Evangeline aquifers between 1937 and 1979. The preconsolidation pressure heads for aquitards within these two aquifers were continuously updated in response to lowering groundwater levels, which in turn was caused by continuously increasing groundwater withdrawal rates from 0.57 to 4.28 million m3/day. This land subsidence occurred without any management of changes in groundwater levels. However, the management of recovering groundwater levels from 1979 to 2000 successfully decreased inelastic compaction from about 40 mm/yr in the early 1980s to zero around 2000 through decreasing groundwater withdrawal rates from 4.3 to 3.0 million m3/day. The inelastic consolidation that had existed for about 63 years roughly from 1937 to 2000 caused a land subsidence hazard in this region. Some rebounding of the land surface was achieved from groundwater level recovering management. It is found in this paper that subsidence of 0.08 to 8.49 mm/yr owing to a pseudo-constant secondary consolidation rate emerged or tended to emerge at 13 borehole extensometer station locations while the groundwater levels in the two aquifers were being managed. It is considered to remain stable in trend since 2000. The subsidence due to the secondary consolidation is beyond the control of any groundwater level change management schemes because it is caused by geo-historical overburden pressure on the two aquifers. The compaction measurements collected from the 13 extensometers since 1971 not only successfully corroborate the need for groundwater level change management in controlling land subsidence but also yield the first empirical findings of the occurrence of secondary consolidation subsidence in the Quaternary and Tertiary aquifer systems in the Houston-Galveston region.

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