Glacial lake outburst flood at Kedarnath,Indian Himalaya: a study using digital elevation models and satellite images     

Sayantan Das  Nabendu Sekhar Kar  Sunando Bandyopadhyay 《Natural Hazards》2015,77(2):769-786

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Drought assessment in the Dhar and Mewat Districts of India using meteorological,hydrological and remote-sensing derived indices   总被引：1，自引：1，他引：0  

R. N. Sahoo  Dipanwita Dutta  M. Khanna  N. Kumar  S. K. Bandyopadhyay 《Natural Hazards》2015,77(2):733-751

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Upper gondwana succession of the Rewa Basin,India: Understanding the interrelationship of lithologic and stratigraphic variables     

Debarati Mukherjee  Sanghamitra Ray  Saurav Chandra  Shrabani Pal  Saswati Bandyopadhyay 《Journal of the Geological Society of India》2012,79(6):563-575

The current work attempts to address a century old problem regarding the stratigraphic disposition of the Upper Gondwana succession of the Rewa basin based on geological mapping and litholog preparation along well exposed transects. The proposed Upper Gondwana stratigraphy of the Rewa basin comprises a continuous and thick package of Triassic sediments unconformably overlain by the Jurassic Parsora Formation. The Triassic succession consists of a basal Pali Formation, an intermediate and newly designated Karki Formation and the overlying mud-dominant Tiki Formation. These formations are well defined based on physical attributes such as lithology, textures and sedimentary structures, and are easily distinguishable in the field. Based on stratigraphic correlation and fossil content, a Lower-Middle Triassic age has been assigned for the Pali and Karki formations, while the Tiki Formation is Upper Triassic (Carnian) in age. Preliminary observations based on lithological characteristics, sand body geometry and sand: mud ratios suggest that within a fluvial setting there were considerable changes in environments of deposition through time, especially during Triassic to Jurassic transition.  相似文献   

Classification of cyclone hazard prone districts of India     

M. Mohapatra  G. S. Mandal  B. K. Bandyopadhyay  Ajit Tyagi  U. C. Mohanty 《Natural Hazards》2012,63(3):1601-1620

Hazards associated with tropical cyclones are long-duration rotatory high-velocity winds, very heavy rain and storm tide. India has a coastline of about 7,516?km of which 5,400?km is along the mainland. The entire coast is affected by cyclones with varying frequency and intensity. The India Meteorological Department (IMD) is the nodal government agency that provides weather services related to cyclones in India. However, IMD has not identified cyclone-prone districts following any specific definition though the districts for which cyclone warnings are issued have been identified. On the other hand, for the purpose of better cyclone disaster management in the country, it is necessary to define cyclone proneness and identify cyclone-prone coastal districts. It is also necessary to decide degree of hazard proneness of a district by considering cyclone parameters so that mitigation measures are prioritised. In this context, an attempt has been made to prepare a list of cyclone hazard prone districts by adopting hazard criteria. Out of 96 districts under consideration, 12, 45, 31 and 08 districts are in very high, high, moderate and low categories of proneness, respectively. In general, the coastal districts of West Bengal, Orissa, Andhra Pradesh and Tamil Nadu are more prone and are in the high to very high category. The cyclone hazard proneness factor is very high for the districts of Nellore, East Godawari, and Krishna in Andhra Pradesh; Yanam in Puducherry; Balasore, Bhadrak, Kendrapara and Jagatsinghpur in Orissa; and South and North 24 Parganas, Medinipur and Kolkata in West Bengal. The results give a realistic picture of degree of cyclone hazard proneness of districts, as they represent the frequency and intensity of land falling cyclones along with all other hazards like rainfall, wind and storm surge. The categorisation of districts with degree of proneness also tallies with observed pictures. Therefore, this classification of coastal districts based on hazard may be considered for all the required purposes including coastal zone management and planning. However, the vulnerability of the place has not been taken into consideration. Therefore, composite cyclone risk of a district, which is the product of hazard and vulnerability, needs to be assessed separately through detailed study.  相似文献   

An infrared imaging survey of the faint Chandra sources near the Galactic Centre     

R. M. Bandyopadhyay  J. C. A. Miller-Jones  K. M. Blundell  F. E. Bauer  Ph. Podsiadlowski  A. J. Gosling  Q. D. Wang  E. Pfahl  S. Rappaport 《Monthly notices of the Royal Astronomical Society》2005,364(4):1195-1202

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Rebuttal to "Arsenic toxicity of groundwater in parts of the Bengal basin in India and Bangladesh: the role of Quaternary stratigraphy and Holocene sea-level fluctuation" by S.K. Acharyya and others (Environmental Geology 39(10):1127–1137)     

R. Bandyopadhyay 《Environmental Geology》2002,43(1-2):236-237

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Hydrodynamic aspects of tsunami wave motion: a review     

Bandyopadhyay  Arghya  Manna  Shibam  Maji  Dipannita 《Ocean Dynamics》2021,71(5):613-629

Ocean Dynamics - Since the 2004 Indian Ocean tsunami and particularly after the 2011 Tohuku tsunami, there has been a significant increase of computer simulation using real-time data; however,...  相似文献   

Evaluation of operational tropical cyclone intensity forecasts over north Indian Ocean issued by India Meteorological Department   总被引：2，自引：2，他引：0  

M. Mohapatra  B. K. Bandyopadhyay  D. P. Nayak 《Natural Hazards》2013,68(2):433-451

India Meteorological Department (IMD) introduced the objective tropical cyclone (TC) intensity forecast valid for next 24 h over the north Indian Ocean (NIO) in 2003 and extended up to 72 h in 2009. In this study, an attempt is made to evaluate the TC intensity forecast issued by IMD during 2005–2011 (7 years) by calculating the absolute error (AE), root mean square error (RMSE) and skill in intensity forecast in terms of maximum sustained surface wind (MSW). The accuracy of TC intensity forecast has been analysed with respect to basin of formation (Bay of Bengal, Arabian Sea and NIO as whole), season of formation (pre-monsoon and post-monsoon seasons), intensity of TCs (cyclonic storm and severe cyclonic storm or higher intensities) and type of track of TCs (climatological/straight moving and recurving/looping type). The study shows that the average AE (RMSE) in intensity forecast is about 11(14), 14(19) and 20(26) knots, respectively, for 24-, 48- and 72-h forecasts over the NIO as a whole during 2009–2011. The skill of intensity forecast is about 44 %(48 %), 60 %(58 %) and 60 %(65 %) for 24-, 48- and 72-h forecasts during 2009–2011 with respect to AE (RMSE). There is no significant improvement in terms of reduction in AE and RMSE of MSW forecast over the NIO like that over the northwest Pacific and northern Atlantic Oceans during 2005–2011. However, the skill in intensity forecast compared to persistence method has significantly improved by about 6 %(10 %) and 9 %(8 %) per year, respectively, for 12- and 24-h forecasts considering the AE (RMSE) during 2005–2011. There is also significant increasing trend in percentage of 24-h intensity forecasts with error of 10 knots or less during 2005–2011.  相似文献   

Air Pollution Prevention and Control: Bioreactors and Bioenergy     

Amitava Bandyopadhyay 《洁净——土壤、空气、水》2013,41(9):934-935

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Thermodynamics of Gauss-Bonnet brane with modified Chaplygin gas     

Tanwi Bandyopadhyay 《Astrophysics and Space Science》2012,341(2):689-693

We discuss the generalized second law of thermodynamics in the braneworld scenario with induced gravity and curvature correction terms. To explain the present acceleration of the universe, a dark energy component has been chosen on the 3-brane in the form of Modified Chaplygin Gas together with a perfect fluid as the dark matter and we show that the GSLT is valid on the apparent horizon in late time.  相似文献