Numerical Computing and Forecasting to Land Subsidence in Coastal Regions of Tangshan

2010 ◽  
pp. 57-64
Author(s):  
Jing Tan ◽  
Zhigang Tao ◽  
Changcun Li
Keyword(s):  
Land Subsidence ◽  
Coastal Regions ◽  
Numerical Computing

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

Mitigating Land Subsidence Damage Risk by Fly Ash Backfilling Technology: an Injection Case in Overburden of Coal Mining

2020 ◽  
Vol 30 (1) ◽  
pp. 655-661
Author(s):  
Yue Jiang ◽  
Rafal Misa ◽  
Anton Sroka ◽  
Yan Jiang
Keyword(s):  
Fly Ash ◽  
Coal Mining ◽  
Land Subsidence ◽  
Damage Risk

Preface to Special Issue on Large-scale Numerical Computing Technology for Electromagnetic Field Analysis

2019 ◽  
Vol 139 (11) ◽  
pp. 636-636
Author(s):  
Fumiaki Ikeda ◽  
Daigo Yonetsu ◽  
Takeshi Mifune ◽  
Kengo Sugahara
Keyword(s):  
Electromagnetic Field ◽  
Large Scale ◽  
Field Analysis ◽  
Special Issue ◽  
Computing Technology ◽  
Numerical Computing

The Comparison of Land Subsidence between East and West Side of Bangkok, Thailand

2020 ◽  
Vol 17 (3) ◽  
pp. 1
Author(s):  
Angkana Pumpuang ◽  
Anuphao Aobpaet
Keyword(s):  
Time Series ◽  
Land Subsidence ◽  
Time Series Data ◽  
Series Data ◽  
Industrial Estates ◽  
Vertical Displacements ◽  
Land Deformation ◽  
Extensive Farming ◽  
Chao Phraya River ◽  
Set Up

The land deformation in line of sight (LOS) direction can be measured using time series InSAR. InSAR can successfully measure land subsidence based on LOS in many big cities, including the eastern and western regions of Bangkok which is separated by Chao Phraya River. There are differences in prosperity between both sides due to human activities, land use, and land cover. This study focuses on the land subsidence difference between the western and eastern regions of Bangkok and the most possible cause affecting the land subsidence rates. The Radarsat-2 single look complex (SLC) was used to set up the time series data for long term monitoring. To generate interferograms, StaMPS for Time Series InSAR processing was applied by using the PSI algorithm in DORIS software. It was found that the subsidence was more to the eastern regions of Bangkok where the vertical displacements were +0.461 millimetres and -0.919 millimetres on the western and the eastern side respectively. The districts of Nong Chok, Lat Krabang, and Khlong Samwa have the most extensive farming area in eastern Bangkok. Besides, there were also three major industrial estates located in eastern Bangkok like Lat Krabang, Anya Thani and Bang Chan Industrial Estate. By the assumption of water demand, there were forty-eight wells and three wells found in the eastern and western part respectively. The number of groundwater wells shows that eastern Bangkok has the demand for water over the west, and the pumping of groundwater is a significant factor that causes land subsidence in the area.Keywords: Subsidence, InSAR, Radarsat-2, Bangkok

ANALISIS PERUBAHAN PENGGUNAAN LAHAN TERHADAP BAHAYA AMBLESAN TANAH DI KECAMATAN SEMARANG UTARA

2019 ◽  
Vol 3 ◽  
pp. 1089
Author(s):  
Ghefra Rizkan Gaffara ◽  
Fitri Wulandari
Keyword(s):  
Analytic Hierarchy Process ◽  
Land Subsidence ◽  
Analytic Hierarchy ◽  
Hierarchy Process

Kota Semarang merupakan kota metropolitan yang memiliki tingkat bahaya amblesan tanah mencapai 14-19 cm/tahun pada lokasi tertentu (Abidin et al, 2010). Penyebab kritis terjadinya peningkatan amblesan tanah adalah meningkatnya kawasan terbangun secara masif di kawasan pesisir dan eksploitasi pengambilan air tanah, khususnya di Semarang Utara. Penelitian ini bertujuan untuk mengetahui perubahan lahan yang terjadi pada tahun 2004 dan tahun 2013 dan untuk mengetahui indeks bahaya amblesan tanah di penggunaan lahan wilayah studi. Metodelogi yang muncul dalam penentuan land subsidence dengan sebuah konsesus melalui Analytic Hierarchy Process (AHP). Penentuan item yang digunakan mempertimbangkan adanya ancaman/bahaya, tingkat kerentanan, dan risiko. Hasil penelitian menunjukkan bahwa beberapa faktor termasuk penggunaan lahan menjadi penyebab amblesan tanah di wilayah studi. Persentase perubahan lahan sebesar 49,99% untuk perubahan lahan kosong menjadi lahan yang akan dibangun dan industri pergudangan. Faktor-faktor utama yang menjadi penyebab amblesan tanah berdasarkan kuesioner adalah penurunan Muka Air Tanah (MAT) dengan persentase sebesar 61% dan perubahan lahan dengan persentase sebesar 19 %. Penelitian ini menghasilkan rekomendasi baik bersifat teknis maupun non-teknis.

The experience of monitoring the land subsidence in urban areas by radar satellite interferometry on the example of St. Petersburg

2020 ◽  
Vol 64 (4) ◽  
pp. 399-408
Author(s):  
Shirshova V. ◽  
Keyword(s):  
Land Subsidence ◽  
Urban Areas ◽  
Radar Satellite

Разработана и опробована методика мониторинга на основе метода радиолокационной спутниковой интерферометрии с применением открытых данных радиолокационного спутника Sentinel-1. Обработка радиолокационных снимков была реализована на открытом программном обеспечении SNAP. В результате были получены 40 карт вертикальных смещений города Санкт-Петербург. На основе геоинформационного программного обеспечения QGIS был произведен анализ полученных карт смещений и визуализация результатов интерферометрической обработки.

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