scholarly journals Paleocurrents, Paleohydraulics, and Palaegeography of Miocene-Pliocene Siwalik Foreland Basin of India

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Zahid A. Khan ◽  
Ram Chandra Tewari
Keyword(s):  
Indian Subcontinent ◽  
Foreland Basin ◽  
River System ◽  
Bimodal Distribution ◽  
Flood Plain ◽  
North India ◽  
Morphological Attributes ◽  
Gangetic Plains ◽  
Braided Rivers ◽  
Middle Siwalik

Early Miocene-Pliocene Middle Siwalik Subgroup of Kuluchaur area, Uttarakhand, North India, comprises sheet-like, coarse to medium grained, cross bedded sandstone bodies and multistoreyed variegated mudstones. Paleocurrent study shows commonly unimodal and locally bimodal distribution and displays a high magnitude of resultant (R*=0.7337) oriented towards south-southwest (206°  ±  42.27°). Palaeochannel morphological attributes suggest that the depositing river system was about 230 m wide and 4.5 m deep. These broad, shallow, and low sinuous channels with extensive flood plain flowed on a steeper slope (0.00043 degrees) with flow velocity of 60–140 cm/sec. It is visualized that the immature Middle Siwalik rocks were deposited by southward flowing braided rivers transverse to the Himalayas, predominantly in the form of overlapping alluvial fans similar to those depositing sediments at present in the Indo-Gangetic plains. Fairly consistent fluvial palaeoslopes, together with enormous thickness of sediments, are evidences of rapid subsidence of the basin. We conclude that the paleogeography of Indian subcontinent established at the onset of Miocene-Pliocene Siwalik sedimentation is continuing till today.

scholarly journals Study of winter fog over Indian subcontinent : Climatological perspectives

MAUSAM ◽  
2021 ◽  
Vol 65 (1) ◽  
pp. 19-28
Author(s):  
G.K. SAWAISARJE ◽  
P Khare ◽  
C.Y. SHIRKE ◽  
S. DEEPAKUMAR ◽  
N.M. NARKHEDE
Keyword(s):  
Relative Humidity ◽  
Spatial Variability ◽  
Air Temperature ◽  
West Bengal ◽  
Indian Subcontinent ◽  
Winter Season ◽  
Dew Point ◽  
North India ◽  
Gangetic Plains ◽  
Long Period

Fog is localized phenomenon where horizontal visibility is reduced to less than 1000 m due to suspension of very small water droplets in the air. In fact Fog is cloud at surface level. This phenomenon matters to us in our daily activities due to its effect on life, public health, road safety, and economic prosperity.  Its knowledge is essential to meet critical societal needs. In India, radiation and advection fog are most common which occur mostly over north India in winter. This study presents results of spatial variability of average number of days having visibility less than 1000 m at 0300 UTC during winter season over Indian subcontinent (0° N-35° N and 60° E-100° E) using synoptic hour daily surface data. Analysis of Fog events based on half hourly METAR observations for winter months             (December 2010-February 2011) at selected ICAO stations of India is also presented.    The monthly spatial variability of average number of days with fog having visibility less than 1000 m indicates presence of fog over Indo-Gangetic plains on an average of 7 to 10 days during December and more than 8 days during January. South Gangetic West Bengal is susceptible to fog during February. Seasonal variation of fog shows that there is prominence of fog over Indo-Gangetic plains on an average of more than 6.5 days. Significant incidences of foggy days occur over South Interior Karnataka and Coastal Karnataka has incidence of foggy days on an average of 6.5 days. North India is susceptible to dense fog on average of 2.5 days during the season while Gangetic West Bengal, West Rajasthan and adjoining parts of east Rajasthan and East Uttar Pradesh have occurrence of fog on an average of 3.5 days. Thick fog occurs on an average of 3 days over northern India during the winter season. Analysis of time series of air temperature, dew point temperature, dew point depression, visibility, zonal and meridional components of wind and its magnitude at selected ICAO stations indicate that visibility reduces to below 1000 m while light winds are southeasterly at Ahmedabad, northerly to northwesterly at Amritsar, northerly to northeasterly at New Delhi, westerly to southwesterly at Kolkata, Guwahati and dew point depression is below 3 °C during such conditions. Long period 1971-2010 analysis of visibility conditions less than 1000 m over Indian subcontinent shows Indo-Gangetic plains region to have average wind speed to be 0.6 m/s, air temperature in the range 9 °C to 15 °C during December-February at 0300 UTC. Long period 1971- 2010 analysis of relative humidity shows Indo-Genetic plains region to have relative humidity in the range 72% to 84% at 0300 UTC during December-February.

Channel morphology, hydrology and geomorphic positioning of a Middle Miocene river system of the Siwalik foreland basin, India

2014 ◽  
Vol 152 (1) ◽  
pp. 12-27 ◽  
Author(s):  
PRADEEP K. GOSWAMI ◽  
TANUJA DEOPA
Keyword(s):  
Flow Pattern ◽  
Foreland Basin ◽  
River System ◽  
Flood Plain ◽  
Maximum Depth ◽  
Facies Association ◽  
Maximum Width ◽  
Maximum Discharge ◽  
Basement High ◽  
Crevasse Splay

AbstractSystematic lithofacies, palaeocurrent, palaeomorphological and palaeohydrological analyses have provided detailed information about a hitherto unstudied river system of the Siwalik foreland basin of the Himalaya. Three distinct lithofacies associations, each representing a specific depositional setting, have been identified and named as ‘Facies Association A’, ‘Facies Association B’ and ‘Facies Association C’. The ‘Facies Association A’ comprises pebbly sandstone, cross-bedded sandstone, ripple-laminated sandy siltstone and bioturbated mudstone lithofacies and represents deposits of a braided channel. The ‘Facies Association B’ comprises cross-bedded sandstone, bioturbated mudstone, fine sandstone–mudstone alternation and lensoid to prismatic sandstone lithofacies and represents deposits of a channel, natural levee, crevasse-splay and flood plain of a meandering stream. The ‘Facies Association C’ comprises mottled siltstone–mudstone heterolith and fine sandstone lithofacies and represents deposits of the upland interfluve region. The braided stream had a maximum depth of 4.15 m, maximum width of 305 m and maximum discharge of 7045 cumec, whereas the meandering stream had a sinuosity of 1.26, maximum depth of 3.71 m, maximum width of 180 m and maximum discharge of 4070 cumec. The area had a regional radial outward flow pattern, but dominantly towards the SSW. However, the braided river had a bimodal flow pattern due to an active basement-high-induced bend along its course. A comparison of the sediment characters and morphological and hydrological parameters of these streams with those of the modern rivers of the Ganga (Gangetic) basin has enabled us to infer that this river system was located in the medial-distal megafan-interfan setting of the basin.

Translating the Scribe: Lithographic Print and Vernacularization in Colonial India, 1857–1915

2019 ◽  
Vol 16 (2-3) ◽  
pp. 281-300
Author(s):  
Amanda Lanzillo
Keyword(s):  
Nineteenth Century ◽  
South Asia ◽  
Indian Subcontinent ◽  
North India ◽  
Late Nineteenth Century ◽  
Book Production ◽  
Manuscript Culture ◽  
Arabic Script ◽  
Literary Cultures ◽  
Late Nineteenth

Focusing on the lithographic print revolution in North India, this article analyses the role played by scribes working in Perso-Arabic script in the consolidation of late nineteenth-century vernacular literary cultures. In South Asia, the rise of lithographic printing for Perso-Arabic script languages and the slow shift from classical Persian to vernacular Urdu as a literary register took place roughly contemporaneously. This article interrogates the positionality of scribes within these transitions. Because print in North India relied on lithography, not movable type, scribes remained an important part of book production on the Indian subcontinent through the early twentieth century. It analyses the education and models of employment of late nineteenth-century scribes. New scribal classes emerged during the transition to print and vernacular literary culture, in part due to the intervention of lithographic publishers into scribal education. The patronage of Urdu-language scribal manuals by lithographic printers reveals that scribal education in Urdu was directly informed by the demands of the print economy. Ultimately, using an analysis of scribal manuals, the article contributes to our knowledge of the social positioning of book producers in South Asia and demonstrates the vitality of certain practices associated with manuscript culture in the era of print.

New records of Cyanobacterial morphotypes with Leptolyngbya indica sp. nov. from terrestrial biofilms of the Lower Gangetic Plain, India

Phytotaxa ◽  
2017 ◽  
Vol 316 (2) ◽  
pp. 101 ◽  
Author(s):  
MANOJIT DEBNATH ◽  
TARKESHWAR SINGH ◽  
PUNYASLOKE BHADURY
Keyword(s):  
Rice Field ◽  
New Records ◽  
Indian Subcontinent ◽  
Culture Conditions ◽  
South East Asia ◽  
Gangetic Plain ◽  
Gangetic Plains ◽  
Rice Field Soil ◽  
Green Remediation ◽  
Mangrove Soils

Macroscopic cyanobacterial biofilms were collected from alluvial plain soils and estuarine mangrove soils representing the Lower Gangetic Plains of South East Asia (India). The composition of the biofilms was investigated using light microscopy and field emission scanning electron microscopy of collected samples. In this study four simple trichal non-heterocytous morphotypes were found to be unique. Out of four, three morphotypes clearly showed differences with respect to described taxa as based on most recent taxonomic classification and possibly represent new report from the Indian subcontinent. One morphotype was successfully established under culture conditions and described as Leptolyngbya indica sp. nov. isolated from the alluvial arsenic affected rice field soil. This study provides vital information on morphotypic diversity of Cyanobacteria from specific biotopes which can contribute key information on their biogeography and potential application in green remediation.

Gangdese arc detritus within the eastern Himalayan Neogene foreland basin: Implications for the Neogene evolution of the Yalu–Brahmaputra River system

2009 ◽  
Vol 285 (1-2) ◽  
pp. 150-162 ◽  
Author(s):  
Sara E. Cina ◽  
An Yin ◽  
Marty Grove ◽  
Chandra S. Dubey ◽  
Dericks P. Shukla ◽  
...  
Keyword(s):  
Foreland Basin ◽  
River System ◽  
Brahmaputra River

Productivity and Sustainability of the Rice–Wheat Cropping System in the Indo-Gangetic Plains of the Indian subcontinent

2012 ◽  
pp. 315-369 ◽  
Author(s):  
Bhagirath S. Chauhan ◽  
Gulshan Mahajan ◽  
Virender Sardana ◽  
Jagadish Timsina ◽  
Mangi L. Jat
Keyword(s):  
Indian Subcontinent ◽  
Cropping System ◽  
Gangetic Plains

Preliminary screening for orthorexia nervosa in undergraduate student population of north India using ORTO-15 questionnaire

2021 ◽  
Vol 7 (2) ◽  
pp. 79-83
Author(s):  
Mohita Singh ◽  
Jyoti Sethi ◽  
Meenakshi Garg ◽  
Parul Singh ◽  
Utkarsh Sethi
Keyword(s):  
Indian Population ◽  
Indian Subcontinent ◽  
Asian Population ◽  
Orthorexia Nervosa ◽  
North India ◽  
Preliminary Screening ◽  
Prevalence Studies ◽  
High Prevalence ◽  
Study Population ◽  
Young Students

Orthorexia is a term used for “obsession for healthy and proper nutrition”. ON is a recently identified disorder and prevalence studies are mainly limited to Eurasian and Scandanavian countries. There is a paucity of literature currently available for Asian population and more specifically for the Indian population. Therefore, the present study was designed to estimate the prevalence of Orthorexia Nervosa in Indian population. To estimate the prevalence of ON in young North Indian population and to highlight its characteristics. The study population consisted of 448 young students (males=173, females=275). The ORTO-15 questionnaire developed by Donini et al. was used to determine the prevalence. Subjects who scored below 40 were classified as having ON. : Mean score of the participants in the ORTO-15 was using a 40 point threshold. A total of three fourth of the young students in the study group exhibited orthorexic tendency. High prevalence of ON in young students necessitates that Orthorexia Nervosa trends in general population be assessed in Indian subcontinent for better understanding of eating disorders and its interplay with socio-cultural diversities.

scholarly journals Sedimentary facies analysis of the fluvial systems in the Siwalik Group, Karnali River section, Nepal Himalaya, and their significance for understanding the paleoclimate and Himalayan tectonics

2016 ◽  
Vol 51 ◽  
pp. 11-26 ◽  
Author(s):  
Ashok Sigdel ◽  
Tetsuya Sakai
Keyword(s):  
River System ◽  
Precipitation Pattern ◽  
Braided River ◽  
River Section ◽  
Meandering River ◽  
Braided Rivers ◽  
Facies Associations ◽  
Siwalik Group ◽  
Himalayan Tectonics ◽  
Flood Flow

Fluvial sediments of the Siwalik successions in the Himalayan Foreland Basin are one of the most important continental archives for the history of Himalayan tectonics and climate change during the Miocene Period. This study reanalyzes the fluvial facies of the Siwalik Group along the Karnali River, where the large paleo-Karnali River system is presumed to have flowed. The reinterpreted fluvial system comprises fine-grained meandering river (FA1), flood-flow dominated meandering river with intermittent appearance of braided rivers (FA2), deep and shallow sandy braided rivers (FA3, FA4) to gravelly braided river (FA5) and finally debris-flow dominated braided river (FA6) facies associations, in ascending order. Previous work identified sandy flood-flow dominated meandering and anastomosed systems, but this study reinterprets these systems as a flood-flow dominated meandering river system with intermittent appearance of braided rivers, and a shallow sandy braided system, respectively. The order of the appearance of fluvial depositional systems in the Karnali River section is similar to those of other Siwalik sections, but the timing of the fluvial facies changes differs. The earlier appearance (3-4 Ma) of the flood-flow dominated meandering river system in the Karnali River section at about 13.5 Ma may have been due to early uplift of the larger catchment size of the paleo-Karnali River which may have changed the precipitation pattern i.e. intensification of the Indian Summer Monsoon. The change from a meandering river system to a braided river system is also recorded 1 to 3 Ma earlier than in other Siwalik sections in Nepal. Differential and diachronous activities of the thrust systems could be linked to change in catchment area as well as diachronous uplift and climate, the combination of which are major probable causes of this diachronity.

scholarly journals Lithofacies and depositional environment of the Siwalik Group in Samari-Sukaura River area, Central Nepal

2013 ◽  
Vol 16 ◽  
pp. 53-64 ◽  
Author(s):  
Dev Kumar Syangbo ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Depositional Environment ◽  
Foreland Basin ◽  
River System ◽  
Nepal Himalaya ◽  
Meandering River ◽  
Fine Grained ◽  
Architectural Elements ◽  
Central Nepal ◽  
Eastern Zone ◽  
Siwalik Group

Thick sedimentary sequence deposited in the foreland basin of the Nepal Himalaya is represented by the Siwalik Group. The Siwalik Group is well exposed in the Samari-Sukaura River area. The present study is focused in southern portion of the MBT around the Samari-Sukaura area for its depositional environment. The Middle Siwaliks of the Sukaura Road sections is overlained by the Lower Siwaliks which is separated by the Karki Khola Thrust. Extension of the Lower Siwaliks in the Jyamire Khola and the Bundal Khola becomes wider in the eastern Zone. Repetition of the Lower Siwaliks along the southern margin of the MBT is recognized. Depending on lithofacies assemblage and facies analysis, the two broad facies assemblages FA1 and FA2 have been distinguished. FA1 shows SB, FF, LA, LS and CH architectural elements and is interpreted as a product of the fine-grained meandering river system. FA2 shows SB, FF, LA, DA and CH architectural elements and is interpreted as a product of sandy mixed-load meandering river system. DOI: http://dx.doi.org/10.3126/bdg.v16i0.8884   Bulletin of the Department of Geology Vol. 16, 2013, pp. 53-64

scholarly journals Arsenic contamination of groundwater in the Kathmandu Valley, Nepal, as a consequence of rapid erosion

2010 ◽  
Vol 40 ◽  
pp. 49-60 ◽  
Author(s):  
Steven H. Emerman ◽  
Tista Prasai ◽  
Ryan B. Anderson ◽  
Mallory A. Palmer
Keyword(s):  
Geometric Mean ◽  
Sulfide Oxidation ◽  
River System ◽  
Flood Plain ◽  
Kathmandu Valley ◽  
Ganges River ◽  
Transition Elements ◽  
Dug Wells ◽  
The Ganges ◽  
System Water

Elevated levels of arsenic (As) in groundwater in the flood plain of the Ganges River have been well-documented over the past decades. The objective of this study was to measure As and the transition elements normally associated with As in the Kathmandu Valley in Nepal, a heavily populated tectonic valley in the upper reaches of the Ganges River system. Water samples were collected from six shallow tubewells (depth < 50 m), eight deep tubewells and 13 dug wells and stone spouts. Electrical conductivity, temperature and pH were measured on-site and concentrations of As, Fe, Cu, Ni, Co, Mn, Zn and Cr were measured with a spectrophotometer. Five tubewells and four dug wells had As levels exceeding the Nepal Interim Standard (As = 0.05 mg/L). There was no statistically significant clustering of As levels either with depth or horizontal location. Arsenic was uncorrelated with either Fe (R2 = 0.096), Mn (R2 = 0.0004) or any combination of transition elements (R2 < 0.083), which is inconsistent with both the reduction-dissolution and the sulfide oxidation models for As release. The geometric mean As level of groundwater (As = 0.015 mg/L) was indistinguishable from the geometric mean As level of surface water (As = 0.013 mg/L) obtained from 48 river samples from the Kathmandu Valley in a previous study. We are suggesting that elevated groundwater As results not from subsurface redox conditions, but from losing streams with elevated As, which is a consequence of rapid erosion caused by a combination of monsoon climate, tectonic uplift and deforestation.

Sign in / Sign up

Export Citation Format

Share Document