Analysis of buried pipelines subjected to reverse fault motion     

Shantanu Joshi  Amit Prashant  Arghya Deb  Sudhir K. Jain 《Soil Dynamics and Earthquake Engineering》2011

Presently available simplified analytical methods and semi-empirical methods for the analysis of buried pipelines subjected to fault motion are suitable only for the strike-slip and the normal-slip type fault motions, and cannot be used for the reverse fault crossing case. A simple finite element model, which uses beam elements for the pipeline and discrete nonlinear springs for the soil, has been proposed to analyse buried pipeline subjected to reverse fault motion. The material nonlinearities associated with pipe-material and soil, and geometric nonlinearity associated with large deformations were incorporated in the analysis. Complex reverse fault motion was simulated using suitable constraints between pipe-nodes and ground ends of the soil spring. Results of the parametric study suggest that the pipeline's capacity to accommodate reverse fault offset can be increased significantly by choosing a near-parallel orientation in plan with respect to the fault line. Further improvement in the response of the pipeline is possible by adopting loose backfill, smooth and hard surface coating, and shallow burial depth in the fault crossing region. For normal or near normal orientations, pipeline is expected to fail due to beam buckling at very small fault offsets.  相似文献   

Sinkhole characterization in the Dead Sea area using airborne laser scanning     

Sagi Filin  Amit Baruch  Yoav Avni  Shmuel Marco 《Natural Hazards》2011,58(3):1135-1154

Since the early 1980s, the Dead Sea coast has undergone a near catastrophic land deterioration as a result of a rapid lake-level drop. One conspicuous expression of this deterioration is the formation of sinkholes fields that puncture the coastal plains. The evolution of sinkholes along nearly 70-km strip has brought to a halt the regional development in this well-known and toured area and destroyed existing infrastructures. Great efforts are being invested in understanding the phenomena and in development of monitoring techniques. We report in this paper the application of airborne laser scanning for characterization of sinkholes. We demonstrate first the appropriateness of laser scanning for this task and its ability to provide detailed 3D information on this phenomenon. We describe then an autonomous means for their extraction over large regions and with high level of accuracy. Extraction is followed by their detailed geometric characterization. Using this high-resolution data, we show how sinkholes of 0.5 m radius and 25 cm depth can be detected from airborne platforms as well as the geomorphic features surrounding them. These sinkhole measures account for their embryonic stage, allowing tracking them at an early phase of their creation.  相似文献   

Quantitative modeling of groundwater in Satluj River basin of Rupnagar district of Punjab using remote sensing and geographic information system   总被引：3，自引：1，他引：2  

Chander Kumar Singh  Satyanarayan Shashtri  Amit Singh  Saumitra Mukherjee 《Environmental Earth Sciences》2011,62(4):871-881

Water is a fluctuating resource making it difficult to measure in time and in space. To demonstrate the efficiency of the geographic information system (GIS) for groundwater studies, information on the parameters controlling groundwater such as lithology, geomorphology and lineament analysis were analyzed. LISS-III and Landsat satellite image of the area was used to infer information on the geologic lineaments and geomorphology. To delineate linear features enhancement and direction, filtering was performed on single bands of Landsat images. Thematic maps for geology, slope, geomorphology and lineament were prepared and integrated in GIS by assigning the weights and ranking to various parameters controlling the occurrence of groundwater to generate the groundwater potential map for the study area. The results indicate that the floodplain of river and its adjoining areas have very good groundwater potential, whereas the steeply sloping area in the northern part having high relief and slope possesses poor groundwater potential.  相似文献   

Trends in thermal discomfort indices over western coastal cities of India     

Desai  Manasi S.  Dhorde  Amit G. 《Theoretical and Applied Climatology》2018,131(3-4):1305-1321

Theoretical and Applied Climatology - The present research aimed at analyzing temporal trends in thermal discomfort indices for a period of 46 years from 1969 to 2014 over western coastal...  相似文献   

Mapping of apple orchards using remote sensing techniques in cold desert of Himachal Pradesh,India     

Amit Kumar  K. N. Singh  Brij Lal  R. D. Singh 《Journal of the Indian Society of Remote Sensing》2008,36(4):387-392

The present study was conducted to map Apple orchards in dry alpine Spiti region of Indian Himalaya using LISS III satellite image. The barren terrain with sparse woody vegetation helped in classification of apple orchards with 91.3 % accuracy. The orchards were found in 154.6 ha of the study area and are anticipated to expand owing to its economic importance.  相似文献   

The effects on water mass formation of surface mixed layer timedependence and entrainment fluxes     

Chris Garrett  Amit Tandon 《Deep Sea Research Part I: Oceanographic Research Papers》1997,44(12):1991-2006

An air-sea buoyancy flux out of the ocean between the surface outcroppings of different isopycnals must be balanced by a convergence of advective and diffusive fluxes of buoyancy across those isopycnals (Walin, 1982; Tziperman, 1986; Garrett et al., 1995). For steady conditions, the diapycnal diffusive flux due to vertical mixing in the surface mixed layer is very small, so that the advective buoyancy flux dominates (Speer, 1993; Garrett et al., 1995). The associated advective buoyancy flux can then be used to estimate the volume flux of water out of the base of the surface mixed layer. The resulting thermodynamic algorithm provides a valuable estimate of water mass formation in the ocean.In contrast, for the time-dependent real ocean with horizontal and vertical gradients of the horizontal buoyancy gradient, diurnal and seasonal mixed layer deepening and entrainment in the presence of a buoyancy jump at the base of the mixed layer contributes to the annual volume flux out of the base of the deepest (wintertime) mixed layer. The mismatch between the predictions of the ideal algorithm and measured rates of water mass formation (Speer, 1997) may thus be partly due to mixed layer processes rather than diapycnal mixing in the thermocline.  相似文献   

GPR Data Analysis of Weak Signals Using Modified S-Transform     

Silky Agrawal  Nithin V. George  Amit Prashant 《Geotechnical and Geological Engineering》2015,33(5):1167-1182

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Shear Behaviour of Rock Joints Under CNL and CNS Boundary Conditions     

Amit Kumar Shrivastava  K. Seshagiri Rao 《Geotechnical and Geological Engineering》2015,33(5):1205-1220

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Genesis and rapid weakening of tropical cyclone Lehar (2013)     

Rajasree  V. P. M.  Bhate  Jyoti N.  Kesarkar  Amit P.  Singh  Vikas 《Natural Hazards》2021,109(1):371-388

Natural Hazards - Tropical cyclogenesis and rapid weakening are subjects of considerable interest in the literature. This paper addresses the genesis and rapid weakening of a North Indian Ocean...  相似文献   

A Review on Chemical Stabilization of Peat     

Khanday  Suhail Ahmad  Hussain  Monowar  Das  Amit Kumar 《Geotechnical and Geological Engineering》2021,39(8):5429-5443

Geotechnical and Geological Engineering - Peat is a problematic or weak soil derived from fossilized organic material. The characteristics of peat like low shear strength (3–16 kPa),...  相似文献