DInSAR-based monitoring of land subsidence related to groundwater over-exploitation: example from developing urban center of Nairobi, Kenya

2021 ◽  
Author(s):  
Dinesh Kumar Sahadevan ◽  
Anand Kumar Pandey
Keyword(s):  
Land Subsidence ◽  
Urban Center ◽  
Over Exploitation

scholarly journals REVIEW OF THE LAND SUBSIDENCE HAZARD IN PEKALONGAN DELTA, CENTRAL JAVA: INSIGHTS FROM THE SUBSURFACE

2021 ◽  
Vol 36 (4) ◽  
pp. 163-176
Author(s):  
Dwi Sarah ◽  
Eko Soebowo ◽  
Nugroho Aji Satriyo
Keyword(s):  
Land Subsidence ◽  
Groundwater Resources ◽  
Research Direction ◽  
Future Research ◽  
Land Loss ◽  
Subsurface Geology ◽  
The North ◽  
Central Java ◽  
Over Exploitation ◽  
Global Threat

Land subsidence is a global threat to coastal areas worldwide, including the North Java coastal area. Of many areas experiencing land subsidence in North Java, the rate of land subsidence in Pekalongan has matched the high subsidence rates usually found in big cities. The rate of land subsidence in Pekalongan far exceeds the sea-level rise, resulting in a looming threat of land loss. The devastating impacts of land subsidence are the manifestation of its subsurface movement. Therefore, it is essential to understand the subsurface to elucidate the mechanism of land subsidence. Previous studies on land subsidence in Pekalongan are mainly related to subsidence rate monitoring and have not elaborated on the subsurface condition. This paper reviews the Pekalongan subsurface geology based on available literature to provide insight into the land subsidence problem. The results revealed that the land subsidence occurs in the recent alluvial plain of Pekalongan, consisting of a 30-70 m thick compressible deposit. Possible mechanisms of land subsidence arise from natural compaction, over-exploitation of confined groundwater, and increased built areas. As the seismicity of the study area is low, tectonic influence on land subsidence is considered negligible. It is expected that the offshore, nearshore, and swamp deposits are still naturally compacting. As the surface water supply is minimal, over-exploitation of groundwater resources from the deltaic and Damar Formation aquifers occurs. In the end, future research direction is proposed to reduce the impacts of the subsidence hazard.

Land subsidence by groundwater over-exploitation from aquifers in tectonic valleys of Central Mexico: A review

2018 ◽  
Vol 246 ◽  
pp. 91-106 ◽  
Author(s):  
Sócrates Figueroa-Miranda ◽  
José Tuxpan-Vargas ◽  
José Alfredo Ramos-Leal ◽  
Víctor Manuel Hernández-Madrigal ◽  
Cecilia Irene Villaseñor-Reyes
Keyword(s):  
Land Subsidence ◽  
Central Mexico ◽  
Over Exploitation

scholarly journals STUDY ON LAND SUBSIDENCE INCANGZHOU AREA BASEDON SENTINEL-1A/B DATA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 675-682
Author(s):  
H. Zhou ◽  
Y. Wang ◽  
S. Yan
Keyword(s):  
Ground Water ◽  
Land Subsidence ◽  
High Speed ◽  
Ground Surface ◽  
Relative Deformation ◽  
The West ◽  
Sar Images ◽  
Annual Average ◽  
High Speed Railway ◽  
Over Exploitation

This paper, obtaining 39scenesof images of the Sentinel-1 A/B, monitored the Cangzhou area subsidence from Mar. 2015 to Dec. 2016 basing on using PS-InSAR technique. The annual average subsidence rate and accumulative subsidence were obtained. The results showed that the ground surface of Xian County,Cang County, Cangzhou urban area had a rebound trend; Qing County, the east of Cang County ,the west of Nanpi County and Dongguang County appeared obvious subsidence, and the accumulated subsidence in Hezhuang village of Dongguang County reached 47 mm. And from that the main reason leading to these obvious subsidence was over-exploitation of ground-water. At last, it analyzed the settlement of the High-Speed Railway (HR) which was north from the Machang town of QingCounty and south to the Lian town of Dongguang County in Cangzhou.The relative deformation of the HR between the two sections which was Lierzhuang village of Cang County and Chenxin village of Nanpi County arrived at 30 mm. Moreover, this paper discussed the application of Sentinel-1 A/B SAR images in monitoring urban land subsidence and the results provided important basic data for the relevant departments.

scholarly journals The interaction between land subsidence and urban development in China

2015 ◽  
Vol 372 ◽  
pp. 471-474
Author(s):  
Y. Yang ◽  
R. Wang ◽  
Y. Zhou ◽  
Y. Jiang ◽  
X. Wang
Keyword(s):  
Water Resources ◽  
Urban Development ◽  
Land Subsidence ◽  
Yangtze River Delta ◽  
Economic Losses ◽  
Safety Hazards ◽  
Potential Safety ◽  
Northern Chinese ◽  
Over Exploitation ◽  
The Relationship

Abstract. The Yangtze River Delta and North China Plain are experiencing serious land subsidence development and are also the areas that have undergone the fastest urbanization. Rapid urban development inevitably requires more water resources. However, China is a country with small per capita water resources, nonuniform distribution of water resources, and over-exploitation of groundwater – all of which are critical factors contributing to the potential for a land subsidence disaster. In addition, land subsidence has brought about elevation loss, damaged buildings, decreased safety of rail transit projects, lowered land value, and other huge economic losses and potential safety hazards in China. In this paper, Beijing, a typical northern Chinese city deficient in water, is taken as an example to explore (a) the problems of urban development, utilization of water resources, and land subsidence development; (b) the harm and influence of land subsidence hazards on urban construction; and (c) the relationship between urban development and land subsidence. Based on the results, the author has predicted the trend of urban development and land subsidence in Beijing and puts forward her viewpoints and suggestions.

scholarly journals Monitoring Land Subsidence With The Combination of Persistent Scatterer Interferometry Techniques And Distributed Fiber Optic Sensing Techniques: A Case Study In Suzhou, China

2021 ◽  
Author(s):  
Hongwei Sang ◽  
Bin Shi ◽  
Dan Zhang ◽  
Suping Liu ◽  
Yi Lu
Keyword(s):  
Land Subsidence ◽  
Land Surface ◽  
Fiber Optic ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer ◽  
Fiber Optic Sensing ◽  
Over Exploitation ◽  
Monitoring Technologies

Abstract Land subsidence is a global geo-hazard caused by various natural and human factors, and it directly threatens the safety of the environment and infrastructures. Investigating the mechanism of land subsidence is becoming more and more important. In this paper, we use the Persistent Scatterer Interferometry (PSI) technique combining the Distributed Fiber Optic Sensing (DFOS) technique to detect the spatial-temporal distributions of land subsidence and investigate the stratum deformation characteristics in Shengze, Suzhou. By analyzing Sentinel-1A date between 2017 and 2019 with the PSI technique and the deformation date derived by the DFOS technique, we conclude that the land surface deformations are mostly affected by the transitional exploitation of groundwater. The average Line-Of-Sight (LOS) deformation rate is mostly concentrated in -3 to 2.2 mm/yr, and a maximum subsidence rate of up to -16.9 mm/yr is observed in four industrial areas. Meanwhile, the DFOS-derived results reveal that the compression strata are mostly concentrated in 41.2-137.9 m depth, which is closely associated with the pore water pressure in the second confined aquifer. And it also reveals that the groundwater over-exploitation may be the significant triggering factor of the subsidence in the study area. The InSAR-derived results are also evaluated by the deformation time series obtained by the DFOS technique. The combination of those two new sensing and monitoring technologies enables us to highlight the large deformation area and reveal the mechanism of its subsidence, which is conducive to urban development, disaster risk management, and rational exploitation and management of groundwater in Suzhou.

scholarly journals Regulation of deep groundwater based on MODFLOW in the water intake area of the South-to-North Water Transfer Project in Tianjin, China

2018 ◽  
Vol 20 (4) ◽  
pp. 989-1007 ◽  
Author(s):  
Xiyuan Deng ◽  
Fawen Li ◽  
Yong Zhao ◽  
Shaofei Li
Keyword(s):  
Water Table ◽  
Water Intake ◽  
Land Subsidence ◽  
Water Transfer ◽  
The South ◽  
Deep Groundwater ◽  
Groundwater Exploitation ◽  
North Water ◽  
Over Exploitation

Abstract With the development of economy and society, deep groundwater exploitation has intensified, even to the point of over-exploitation, resulting in multiple geological disasters. Thus, it is essential to regulate the deep groundwater table to a reasonable range. This paper selected the water intake area of the South-to-North Water Transfer Project in Tianjin as a case study. First, the groundwater flow and land subsidence model with MODFLOW-2005 and SUB Package were constructed. Second, the regulation schemes were designed based on the corresponding regulation principles. Lastly, the established groundwater model was adopted to forecast and simulate deep water table and land subsidence under different exploitation scenarios, and regulation effects were analyzed from the viewpoints of exploitation total amount, exploitation distribution, and exploited horizon. The results showed that groundwater tables of different layers and land subsidence were effectively controlled and improved under the three exploitation schemes for different planning level years. The exploitation total amount of groundwater, exploitation distribution, and exploited horizon had a direct impact on water table and land subsidence. From the perspective of regulating deep groundwater, all three schemes could achieve this goal, hence the three schemes were reasonable and feasible. The results are of great significance for rational utilization of deep groundwater.

scholarly journals Land Subsidence Monitoring in Jagadhri City Using Sentinel 1 Data and DInSAR Processing

Proceedings ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 25 ◽  
Author(s):  
Amitesh Gupta ◽  
Udit Asopa ◽  
Rajarshi Bhattacharjee
Keyword(s):  
Land Subsidence ◽  
Surface Deformation ◽  
Unconsolidated Sediments ◽  
Potential Threat ◽  
Aquifer System ◽  
Ground Survey ◽  
River Yamuna ◽  
Over Exploitation ◽  
Subsidence Monitoring ◽  
The City

DInSAR is a renowned method for estimating land subsidence based on the principles of interferometric synthetic aperture radar using different series of the temporal dataset. The present study has been performed using GMTSAR software with Sentinel 1 SAR data of C band for the duration of 2017–2019 (January to April) and focused particularly over the area of Jagadhri city which is situated 100 km away from Chandigarh, which has been identified under the potential threat of land subsidence. The DInSAR method has been applied in this study that came up with an outcome of three interferograms and yearly displacement that broadcast an update on the diagnosis of subsidence activity in the area. A total of six Single Look Complex (SLC) datasets were selectively chosen with a minimum temporal and spatial baseline so that the problem of decorrelation would be minimal. Goldstein filtering has been applied to the deburst interferograms which reduced the noise and, in turn, improved the quality of output. The city is located on the western bank of river Yamuna and about 55 km on the east of Ambala. Due to the presence of unconsolidated sediments in the aquifer system and over-exploitation of groundwater to meet the domestic needs has led to surface deformation in and around the city area. The outcome of this study identifies the area of depression quite distinctly while the accuracy has been assessed by ground survey. The rate of subsidence estimated approximately 4.98 cm/year which can prove to be disastrous over the course of time.

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