Geophysical surveys for identifying source and pathways of subsurface water inflow at the Bangur chromite mine,Odisha, India     

Arkoprovo Biswas  Shashi Prakash Sharma 《Natural Hazards》2017,88(2):947-964

Geophysical survey was carried out in an effort to solve an underground flooding problem at the Bangur chromite mine of Odisha Mining Corporation Limited, Odisha, India. To identify sources and pathways of the influx, very low-frequency electromagnetic, self-potential and resistivity surveys were performed. Geophysical studies clearly depict a major fracture zone passing through the mine and its connection to a water storage pond. The fracture zone extends further west from the pond to the Salandi River and the Salandi Reservoir. The dip of the delineated fracture zone is around 45° to the N, and it matches with the fault plane exposed in the mine. Since water enters into the mine from the west, the delineated fracture zone is thought to be the main pathway for the inflow. Geophysical studies conclude that the IMFA pond, Salandi River and Salandi Reservoir could be possible sources of water in the mine. To ascertain the source and pathway, tracer testing was conducted at two locations, based on the geophysical survey by the hydrogeological team, but tracer test results were inconclusive. However, the fact remains that the water enters to the mine through the delineated fracture and poses threat in mine operation. Dumping water in nearby pond will again enter in mine with interconnected fractures. Therefore, for safe mining operation, it is proposed to drill a slanted tube well at the delineated fracture and pump out maximum water and discharge the pumped water at canal situated about 2.5 km from the mine.  相似文献   

A simplified method for determination of contents of arsenic in ground water from major oxide element of iron by regresssion analysis     

B. J. Sengupta  S. Lahiri  U. K. Biswas 《Journal of the Geological Society of India》2017,89(5):613-613

  相似文献   

Modeling of source parameters and moment tensors of local earthquakes occurring in the eastern Indian shield     

Koushik Biswas  Prantik Mandal 《Journal of the Geological Society of India》2017,89(6):619-630

Earthquake source parameters and crustal Q are being estimated simultaneously through the inversion of S-wave displacement spectra from three-component recordings of ten local cratonic intraplate earthquakes from 3-6 broadband stations in the eastern Indian shield, wherein, an iterative Levenberg-Marquardt inversion technique is used. The estimated seismic moment (M_o) and source radii (r) vary from 7.4 x 10¹² to 7.1 x 10¹⁴ N-m and 144.2 to 211.3 m, respectively, while estimated stress drops (Δσ) and multiplicative factor (E_mo) values range from 0.11 to 4.13 MPa and 1.33 to 2.16, respectively. The corner frequencies range from 6.23 to 8.62 Hz while moment magnitudes vary from 2.44 to 3.57. The radiated seismic energy and apparent stresses range from 8.3 x 10⁶ to 2.0 x 10¹⁰ Joules and 0.06 to 0.94 MPa, respectively, wherein the estimated corner frequencies and seismic moment satisfy the relation Mo ∞ f _c ^–(3+ε) for ε = 12.7. Thus, the source scaling of these events clearly deviates from the self-similarity i.e. f^–3. Estimated Zuniga parameters reveal that all selected events satisfy the partial stress drop model, which is in good agreement with the global observations. Our estimated crustal S-wave quality factors vary from 1091 to 4926 with an average of 3006, suggesting a less heterogeneous crustal structure underlying the study region.We also perform moment tensor inversion of five selected local events using ISOLA software, which reveals that the dominant deformation mode for the eastern Indian shield is left-lateral strike slip motion with minor normal dip-slip component on an almost vertical plane. This observation suggests that neotectonic vertical movements might have played a key role in generating these earthquakes. Our modeling also depicts that the seismically mildly active Singhbhum shear zone and Eastern Ghats mobile belt are characterized by the left-lateral strike motion while two events in the Chotanagpur half graben belt suggest a normal dip-slip motion along a south dipping plane. A north-south orientation of P-axis is found to be dominant in the area, which is consistent with the prevailing north–south compression over the Indian plate.  相似文献   

Black holes in the Einstein–Gauss–Bonnet theory and the geometry of their thermodynamics—II     

Ritabrata Biswas  Subenoy Chakraborty 《Astrophysics and Space Science》2010,326(1):39-44

In the present work we study (i) the charged black hole in Einstein–Gauss–Bonnet (EGB) theory, known as the Einstein–Maxwell–Gauss–Bonnet (EMGB) black hole and (ii) the black hole in EGB gravity with a Yang–Mills field. The thermodynamic geometry of these two black hole solutions has been investigated, using the modified entropy in Gauss–Bonnet theory.  相似文献   

Water for sustainable development in the 21st century: a global perspective   总被引：2，自引：0，他引：2  

Asit K. Biswas Dr. 《GeoJournal》1991,24(4):341-345

Many arid and semi-arid countries are feeling water crisis already at present, and the problem will become more serious in the 21st century. Global water consumption will increase, 10-fold during this century, and the increasing trend will continue well into the 21st century. This Presidential Address to the International Water Reserves Association discusses the reasons for the water crisis, and the major water issues of the 21st century. Among those issues are water conservation and efficient use of water, water pricing and cost recovery, social and environmental considerations, institutional responses to better management, management of international water bodies and proper analytical frameworks.  相似文献   

Water development in developing countries: Problems and prospects     

Dr. A. K. Biswas 《GeoJournal》1979,3(5):445-456

Important as water is to man's manifold activities, a significant percentage of mankind still do not have access to clean water for drinking and personal hygiene. According to a WHO survey of facilities available in developing countries to the end of 1975, 75 % of urban population and 20 % of rural population have access to potable water. Studies carried out by the UN system estimate that investment necessary to provide clean water and sanitation by 1990 to both rural and urban areas is on the order of $ 132,940 million in constant 1977 dollors. Furthermore, provision of clean water alone is unlikely to eliminate all water-borne diseases, since it is only one of several complex factors affecting human health.The situation in developing countries on water requirements for agriculture, industry and generation of hydroelectric power also requires attention because of large amounts of water involved. Effectiveness and efficiency of the supply and distribution systems must be given top priority. There is a considerable potential for improving the efficiency of water use in virtually every developing country and in every sector.  相似文献   

Correspondence     

Asit K. Biswas 《Climatic change》1979,2(1):99-99

  相似文献   

Elastic waves from a circular disc source     

K. Viswanathan  Rathindra Nath Biswas 《Pure and Applied Geophysics》1972,95(1):27-33

Summary Elastic waves radiated by a finite circular disc source are compared for two models by treating it as the limit of an explosion inside a cavity in the form of a circular cylinder of small height or an oblate spheroid of small minor axis.Now on leave at the Department of Applied Mathematics and Theoretical Physics, University of Cambridge, England (Priv. Address: 19 Marlowe Road, Cambridge, England).  相似文献   

Seismic waves due to storm over the sea: I     

Rathindra Nath Biswas  Jagdish Chandra 《Pure and Applied Geophysics》1972,101(1):43-53

Summary Elastic wave propagation problem has been studied in the composite medium — a gravitating liquid layer overlying an elastic half-space. Assuming moving normal pressure load on the free surface, an attempt has been made to study the order of disturbance on the earth's surface. In the discussion asymptotic values of the displacement, components have been considered for small values of the parameter.  相似文献   

Chemical characteristics and origin of H chondrite regolith breccias     

Michael E. Lipschutz  Swarajranjan Biswas  Harry Y. McSween 《Geochimica et cosmochimica acta》1983,47(2):169-179

We report petrologic data and contents of Ag, Bi, Cd, Co, Cs, Ga. In, Rb, Se, Te, Tl and Zn-trace elements spanning the volatility/mobility range-in light and dark portions of H chondrite regolith breccias and L chondrite fragmental breccias. The chemical/petrologic characteristics of H chondrite regolith breccias differ from those of non-brecciated chondrites or fragmentai breccias. Petrologic characteristics and at least some trace element contents of H chondrite regolith breccias reflect primary processes; contents of the most volatile/mobile elements may reflect either primary or secondary processing, possibly within layered H chondrite parent object(s). Chemical/petrologic differences existed in different regions of the parents). Regolith formation and gardening and meteoroid compaction were not so severe as to alter compositions markedly.  相似文献