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71.
Prizomwala S. P. Gandhi Drasti Ukey Vishal M. Bhatt Nilesh Rastogi B. K. 《Natural Hazards》2015,75(2):1187-1203
Natural Hazards - The coastal segment of Diu Island from west coast of India has been studied for its boulder deposits. The dimensions, morphology and characteristics of these boulders were studied... 相似文献
72.
73.
Angelica glauca is one of the important medicinal plants and it is widely used by indigenous communities for different purposes. The present study analyzes variability in reproductive characters of A. glauca. The reproductive parts were found having significant positive correlation with altitude (e.g.,number of umbellets /umber r= 0.857,p〈0.05; umbel diameter r=0.735,p〈0.05). 相似文献
74.
Urban flooding needs to be understood holistically and addressed geospatially by all stakeholders. In the present study, an attempt is made to understand the problem of urban flooding in part of Hyderabad city (Zone-12) geospatially considering the satellite-based changes in land use/land cover between 1989 and 2016, identifying low-lying areas vulnerable to flooding using HAND (height above nearest drainage) model in conjunction with the analysis of high-resolution satellite images and ground based validation of affected locations during rains of September 2016. The study shows that Zone-12 has undergone significant increase in impervious cover by 42% between 1989 and 2016. The impact of urbanization has obliterated the footprints of stream network, significantly changing the hydrological landscape due to burial of channels and concretization of lake beds. The interconnected channel network and lake system acting as sinks to absorb high runoff during monsoons have been encroached upon aggravating the urban flooding problem. The study shows that HAND model can be an effective tool under data scarce environments, limited cloud-free high-resolution satellite data availability during floods to have first cut baseline information on flood vulnerable areas. 相似文献
75.
We present X-ray emission characteristics of the massive O-type stars DH Cep and HD 97434 using archival XMM-Newton observations. There is no convincing evidence for short-term variability in the X-ray intensity during the observations. However, the analysis of their spectra reveals X-ray structure being consistent with two-temperature plasma model. The hydrogen column densities derived from X-ray spectra of DH Cep and HD 97434 are in agreement with the reddening measurements for their corresponding host clusters NGC 7380 and Trumpler 18, indicating that the absorption by stellar wind is negligible. The X-ray emission from these hot stars is interpreted in terms of the standard instability-driven wind-shock model. 相似文献
76.
Water chemistry, sediment texture, clay mineralogy and foraminiferal contents from the bottom of Meda creek were studied to
assess the geo-environmental status of the creek. Water quality data for three seasons suggests domination of marine environment
as pH remained above 8 and salinity above 35‰ throughout. Clay dominate the bottom sediments, except near mouth. Montmorillonite,
illite and kaolinite are the major clay minerals in the sediments. In absence of any source rock in the catchment of the Meda
creek, the presence of illite and kaolinite indicates their transportation and depositions from near coastal waters during
high tides. Ammonia sp. is the most dominating foraminifera. Reworked forms as well as angular asymmetric forms of foraminifera were dominant
in clay rich areas of the creek. 相似文献
77.
78.
Mikls Kzmr Nilesh Bhatt Vishal Ukey Siddharth Prizomwala Danko Taboroi Balzs Szkely 《Geoarchaeology》2016,31(5):376-387
There is a tank hewn into coastal Pleistocene limestone near Diu city on the Saurashtra Peninsula of western India. Site survey and a review of similar structures worldwide provide evidence that this tank could have been used for holding fish or Murex snails. The approximately 5 × 5 m tank is connected to the sea by a 1‐m‐deep canal; today it would be impossible to use the tank, given that not even the high spring tides can fill it. It is suggested that the Diu coast was uplifted by ∼0.5 m after the tank was hewn in the coastal platform. Since that time, the carved surfaces have been modified by coastal karst dissolution and have developed deep gouge marks. Uplift of the Diu coast raises the possibility of a major seismic event in Diu during the latter part of the last millennium. 相似文献
79.
A. K. Dwivedi U. K. Pandey C. Murugan A. K. Bhatt P. V. Ramesh Babu Mallikarjun Joshi 《Journal of the Geological Society of India》2011,77(6):527-538
The Barabazar granite, exposed at the northern margin of Singhbhum craton, Eastern India, occurs along the South Purulia Shear
Zone (SPSZ) and is emplaced into the Palaeoproterozoic metapelites and felsic volcanics of Singhbhum Group. Geochemical, petrographical
and geochronological studies on the Barabazar granite addressed in the work have wide implications on understanding the geodynamics
of SPSZ during Palaeoproterozoic to Mesoproterozoic. Geochemically, Barabazar granite displays limited range of major oxides,
alkali enrichment and highly fractionated features (SiO2 > 75%; Eu/Eu* = 0.16–0.33; enrichment of K, Rb, Th, U and Nb; depletion of Ba, Sr, P and Ti). It is predominantly peraluminous
(molar Al2O3/CaO+Na2O+K2O (A/CNK) =1.14–144) and contains abundant alkali feldspar, perthite, and minor plagioclase, biotite and accessory minerals.
Geochemical and petrological data indicates that it is A-type granite, which formed in ‘Within plate granite’ tectonic set
up. The Barabazar granite was emplaced at ca. 1771 Ma (Pb-Pb) in rift related environs and evolved by partial melting of stabilized
lower/middle crust (initial 87Sr/86Sr = 0.7302 ± 0.0066 and μ1 = 8.5 ± 0.5). Subsequently, the shear zone (SPSZ) developed during the closure of the riftogenic basin and was reactivated
during the Grenvillian orogeny (Ca. 900–1300 Ma), resulting in rehomogenisation of the strontium isotopes and thereby yielding
younger whole-rock Rb-Sr isotope age of c. 971 Ma for the Barabazar granite. Probably during this tectonic event, the Singhbhum
craton (Southern India Shield) would have finally juxtaposed with Northern Indian Shield along Central Indian Tectonic Zone
(CITZ) during the global Grenvillian orogeny. 相似文献
80.
Journal of Geographical Sciences - Analyzing long term urban growth trends can provide valuable insights into a city’s future growth. This study employs LANDSAT satellite images from 1990,... 相似文献