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Littérature scientifique sur le sujet « Godavari valley »

Auteur : Grafiati
Publié le 6 septembre 2023

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Articles de revues sur le sujet "Godavari valley"

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Maskey, Ujwal Kumar, et Naresh Kazi Tamrakar. « Study on gross streambank sediment erosion from the Godavari Khola, southeast Kathmandu Valley, Central Nepal ». Journal of Nepal Geological Society 55, no 1 (4 juin 2018) : 31–43. http://dx.doi.org/10.3126/jngs.v55i1.22787.

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The fifth order Godavari Khola is flowing from the South to the North direction and is one of the major tributaries from the southern part of the Kathmandu Valley. As the urbanization is growing in the Kathmandu Valley the banks of the streams are being targeted for the housing and roads, therefore it is important to know the characteristic of the river behavior, nature of erosion and sediment production along its banks. This study accesses the stream bank erosion characteristics and sediment production by erosion along the Godavari Khola. It was conducted by surveying and accessing hydraulic parameters, Bank Erosion and Lateral Instability status, streambank recession rates and gross sediment erosion from the bank. The Godavari Khola has high bank erodibility and lateral instability as the hazard level of Bank Erosion and Lateral Instability (BELI) and width/depth ratio are quite high. Since the slope and the bankfull depth exceed the critical slope and critical depth values, respectively, the Godavari Khola is competent enough to mobilize its sediments. The apparent recession rate of the banks of the Godavari Khola is 0.66 m per year yielding 85 m3 volume of the displaced material which weighs 141 tonnes. The estimated bank erosion rate is in between 0.02 to 0.235 m/y and the gross erosion is estimated to be 320 tonnes per year. Similar to the other river of the Kathmandu Valley, the Godavari Khola is very disturbed by the anthropogenic activities. Riparian vegetation clearing and bad agricultural practice is one of the major causes for the high bank erosion and instability of the Godavari Khola.
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Srivastava, S. C., et Neerja Jha. « Palynology of Kamthi Formation from Chelpur Area, Godavari Graben, Andhra Pradesh, India ». Journal of Palaeosciences 35, no (1-3) (31 décembre 1986) : 342–46. http://dx.doi.org/10.54991/jop.1986.1548.

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Palynofossil assemblages recovered from the subsurface sediments of the Chelpur area in the Godavari Graben of Kamthi Formation have been studied. It is deduced that the palynoflora is characterised by the dominance of striate-disaccate pollen. Densipollenites is nearly absent. The palynoflora has been compared with the known Lower Kamthi palynoflora in the Ramagundam area of Godavari Graben and also with Raniganj palynoflora of Damodar Valley coalfields. The recovered palynoflora indicates Late Permian age.
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Pande, B. C. « Kamthi - a new concept ». Journal of Palaeosciences 36 (31 décembre 1987) : 51–57. http://dx.doi.org/10.54991/jop.1987.1559.

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King has described ‘Kamthi beds’ as the group of rocks disconformably overlapping the Permian coal measures. In an otherwise extremely soil covered areas in the Wardha Godavari Graben. Some of the later workers while projecting on the surface the lithics encountered in the sub-surface drilling in the Godavari Valley Coalfield subdivided these beds into lower, middle and upper horizons, by considering them to have gradational contacts, to account for the biota revealed from these litho-units. A reappraisal of the basic geoscientific database (geological and geophysical) and the interpretations from the surface and the sub-surface lithics have undisputedly shown that the pattern of Gondwana sedimentation in the Godavari Valley, during the Palaeozoic and Mesozoic periods, has been in an oscillating and continental fluvial regime governed by the basin configuration and palaeodrainage interrelated to their development in time and space. The palynofossil content unequivocally proves the presence of the Upper Permian lithics lying buried under the Lower Triassic (Kamthi) sediments. The latter has a widespread expanse in the graben, from the northwest to the southeast which is believed to be due to the further deepening of the basin floor at the time of their sedimentation. The possibility of Kamthi constituting the basal part of the enlarged Maleri sequence of the Triassic lithics is very much indicated thereby defining the base of the Triassic in the Godavari Graben. It is thus, considered undisputed that the Kamthi is nothing more than a concept in the geological history of this part of the Godavari Graben which is defined by its mode of occurrence as governed by the associated tectonism.
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Sengupta, Supriya. « Gondwana sedimentation in the Pranhita–Godavari Valley : a review ». Journal of Asian Earth Sciences 21, no 6 (mars 2003) : 633–42. http://dx.doi.org/10.1016/s1367-9120(02)00052-4.

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Sengupta, Supriya M. « Pranhita–Godavari Valley Special Issue (J. Asian Earth Sci.) ». Journal of Asian Earth Sciences 21, no 6 (mars 2003) : 529. http://dx.doi.org/10.1016/s1367-9120(02)00179-7.

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Chaudhuri, Asru K. « Stratigraphy and palaeogeography of the Godavari Supergroup in the south-central Pranhita-Godavari Valley, south India ». Journal of Asian Earth Sciences 21, no 6 (mars 2003) : 595–611. http://dx.doi.org/10.1016/s1367-9120(02)00047-0.

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Chauhan, Ananta Bahadur, Usha Budhathoki et Mahesh Kumar Adhikari. « An Account on Myxomycetes from Kathmandu Valley, Nepal ». Journal of Natural History Museum 26 (17 décembre 2015) : 194–97. http://dx.doi.org/10.3126/jnhm.v26i0.14143.

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This paper reports on 11 species of myxomycetes (Arcyria pomiformis, Arcyria incarnata, Arcyria cineria, Stemoitis sp., Didymium flexuosum,Physarum viride. Hemitrichia serpula, Tubifera microsperma, Fuligo cinerea, Mucilago crustacea and Didymium iridis) gathered in 2006-2008 from the adjoining hills (Shivapuri and Godavari) around the Kathmandu valley. Further studies on the phytogeographic relationship, frequency and dominance of the taxa need to be carried out in future.J. Nat. Hist. Mus. Vol. 26, 2012: 194-197
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Singh, Hemant Kumar, D. Chandrasekharam, A. Minissale, N. Janardhana Raju et A. Baba. « Geothermal potential of Manuguru geothermal field of Godavari valley, India ». Geothermics 105 (novembre 2022) : 102545. http://dx.doi.org/10.1016/j.geothermics.2022.102545.

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Ray, Sanghamitra, et Saswati Bandyopadhyay. « Late Permian vertebrate community of the Pranhita–Godavari valley, India ». Journal of Asian Earth Sciences 21, no 6 (mars 2003) : 643–54. http://dx.doi.org/10.1016/s1367-9120(02)00050-0.

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Saxena, V. K., et Mohan L. Gupta. « Aquifer chemistry of thermal waters of the Godavari Valley, India ». Journal of Volcanology and Geothermal Research 25, no 1-2 (juin 1985) : 181–91. http://dx.doi.org/10.1016/0377-0273(85)90012-5.

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Livres sur le sujet "Godavari valley"

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Pingle, Urmila. Tribal cohesion in the Godavari Valley. Hyderabad, India : Published for and on behalf of Institute of Resource Development and Social Management by Booklinks Corp., 1998.

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G. V. Rama Krishna Rao. Archaeological investigations in the Polavaram : Submergence area of Godavari Valley. New Delhi : Aayu Publications, 2015.

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Murthy, K. Krishna. Hot water seepage into shallow coal mines of Manuguru Coalbelt, Godavary Valley Coalfield, Andhra Pradesh, India. S.l : s.n, 1985.

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Chapitres de livres sur le sujet "Godavari valley"

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Jain, Sohan L., et Tapan Roychowdhury. « Fossil Vertebrates from the Pranhita-Godavari Valley (India) and their Stratigraphic Correlation ». Dans Gondwana Six : Stratigraphy, Sedimentology, and Paleontology, 219–28. Washington, D. C. : American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm041p0219.

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Vikram, Shankar, Dheeraj Kumar et Duvvuri Satya Subrahmanyam. « Support System Design for Deep Coal Mining by Numerical Modeling and a Case Study ». Dans Theory and Practice on Tunnel Engineering [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97840.

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Importance of numerical modeling in mine design gained pace after modern way of approach took birth through many variants. Methods such as Continuum and Discontinuum emerge as most effective in resolving certain issues. Cases such as heterogeneity, prevailing boundary conditions in continuum case and presence of discontinuities in other have provided solutions for many causes. A suitable support system is designed for deep virgin coal mining blocks of Godavari Valley Coalfield in India. This analysis is carried out using numerical modeling technique. The results show that the stresses at an angle to the level galleries are adverse. The level gallery/dip-raise may be oriented at 200 to 400 to reduce roof problems.
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Actes de conférences sur le sujet "Godavari valley"

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Bilwa, L. Mahesh, C. J, Nagamadhu, P. Madesha et M. Prameela. « Permian palynoflora and Paleoenvironmental Depositional Conditions of Lower Gondwana Sediments from South Eastern part of Godavari valley Coalfield, India ». Dans 1st Annual International Conference on Geological & Earth Sciences. Global Science Technology Forum, 2012. http://dx.doi.org/10.5176/2251-3361_geos12.120.

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Sebastian, Maneesha, et Manasa Ranjan Behera. « Surge Height and Current Estimation Along K-G Basin ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77945.

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Numerical investigation on storm surge characteristics would benefit the planners and designers of coastal structures and offshore platforms along the Krishna-Godavari (K-G) basin. The adjoining coastline has a wide range of geomorphological features and varying geometries due to the sediment deposition from the two major rivers, Krishna and Godavari. Two severe cyclonic storms (SCS) Laila (2010) and Helen (2013) that approached the basin from two different directions and made landfalls closer to each other were analyzed for determining the storm surge heights and currents along the K-G river basin. The maximum water elevations and maximum currents during the storm event and evolution of storm surge heights at different locations were studied. It could be concluded from the study that when a SCS event approaches K-G basin, in addition to the tide and wave effect, a maximum storm surge height and current of 1 m and 1.2 m/s can be expected along the coast, respectively. Similarly, the surge and current in the offshore regions were found to be 0.3 m and 0.8 m/s, respectively. These values may be considered while deriving design parameters for the offshore installations. The critical regions in the basin were identified where high surge heights and currents are expected.
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Bharadwaj, Rishabh, Bhavya Kumari et Astha Patel. « Managing Gas Well Blowouts : Case Studies from Assam-Arakan & ; Krishna-Godavari Basin ». Dans SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206602-ms.

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Abstract E&P activities are the early stage of energy production and pivotal for generating and sustaining economic growth. However, negligence and evaluating the circumstances incorrectly during these operations can lead to calamities like blowouts. This paper discusses two such tragedies, the Pasarlapudi (Krishna-Godavari) Gas Well Blowout of 1995 & Baghjan (Assam-Arakan) Oil Field Blowout of 2020, and provides possible well control measures and lessons learned. Pasarlapudi blowout incident occurred during the drilling operations. The pipe stuck-up situation at 2727m MD (Measured Depth) was detected by conducting a stretch test. Further analysis could include circulating brine, checking lost circulation and identifying casing leaks by measuring Sustained Casing Pressure (SCP), Operator-imposed Pressure (OIP), and Thermal-induced Pressure (TIP). Baghjan's gas well at the depth 3870m was producing at 2.8-3.5 MMSCFD. The aim was to plug the lower producing zone and recomplete the well in the upper Lakadong+Therria sand zone. Well was killed using brine, cement plug was placed and BOP installed. BOP was removed after the plug was set to begin the process of moving the workover rig. Well blew gas profusely during this process. Simulating a blowout and facing one, are two completely different situations. In Pasarlapudi's case, the well blew with an enormous gas pressure of 281.2 ± 0.5 kg/cm2. While drilling the production hole (8.5 inch), either differential pressure sticking, presence of water-swelling clay formation or the partial collapse of wellbore formation caused the pipe stuck-up situation. By conducting stretch test along with circulating brine, root cause of this problem could be identified. If differential sticking occurred, lost circulation could be checked & cured, while keeping the hole full. Circulating brine should solve the problem of swelling clay formation while formation collapse could have occurred due to the presence of plastic formation like salt domes. In the case of Baghjan gas well blowout during workover operations, probable safety measures could include placement of 2 or 3 backup cement plugs along with kill fluid or going for squeeze cementing before placing the cement plug & kill fluid while abandoning the lower producing zone. Attempts were made to bring the well under control by adequate water spraying, installing BOP. Water was pumped through the casing valve and a water reservoir was dug near the well plinth for the placement of pumps of 2500 gallon capacity. Proper safety measures should be used even when they're not the cheapest to avoid repetition of treatments and detrimental situations. SCP, OIP and TIP should be measured periodically whenever possible and the root cause of situations like lost circulation, pipe stuck-ups, kicks, casing leaks should be identified before proceeding towards drastic remedial operations. Innovations in countering well-control situations should be promoted invariably.
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Singh, Raj K., Fred R. Holasek, Vijay Ratan, S. C. Gulati et B. A. Thyagaraju. « Enhancement of Leak-Off-Test Values by Mud Additives - A Case Study in Deep-Water Wells in the Krishna-Godavari Basin Offshore India ». Dans SPE/IADC Indian Drilling Technology Conference and Exhibition. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/102001-ms.

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Gupta, Shruti, Mikhil Dange, Francois Missiaen et Animesh Kumar. « Record Setting Casing Run-In Speed Attributed to Significant Surge Reduction System Tailored for Deepwater HP/HT Operation in India ». Dans ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211489-ms.

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Abstract A major operator drilling in the Krishna-Godavari (KG) basin faced challenges attributed to tight tolerance and severe losses while running-in casing in deepwater conditions. The operator initially spent up to five days of rig time filling the casing conventionally and reducing running speeds to reach the planned depth. To help mitigate severe losses and high surge pressure caused by tight tolerance in the wellbore, the operator had to reduce the running speed and use high quantities of lost-circulation material (LCM), which caused premature conversion of float equipment from autofill mode to conventional mode (closed-ended pipe) midway, resulting in longer casing run-in time. Surge and swab analysis was conducted to validate equivalent circulating density (ECD) reduction during the casing run and derive a program of operation to safely optimize the casing run. The surge reduction float equipment package, comprised of a retained flapper valve and ball activation system, allowed the casing to autofill through large flow by areas, tolerant to the LCM in the well, while maintaining compatibility with the subsurface release plug system necessary for deepwater operations. The system allowed for midway circulation, as necessary, to help ensure the fluid level could be maintained during the casing run. The surge reduction equipment set was the first of its kind and consisted of three flapper valves distributed between the float collar and float shoe to provide the necessary redundancy to combat issues with the floats not holding because of the harsh conditions of the operation. It allowed casing to be run at optimum speed and remain within the pore pressure and fracture gradient window. A single deactivation ball installed in the float collar helped ensure the conversion of all valves in both the collar and shoe at the set flow rate, once reaching the planned casing shoe depth. This system combined with high LCM compatible subsurface plug sets not only induced zero losses while performing run in hole (RIH) casing operations (enabling 400% increased casing running speed), it also ensured consistent shoe track integrity with no float valve failure and no wet shoe; this saved several days of deepwater rig time for the operator. The first ever successful deployment of surge reduction float equipment with a subsurface release plug system in India is discussed, which reduced casing run-in time by up to 22 hours.
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