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Yadav, R.
- Assessment of Coastal Erosion along the Indian Coast on 1:25,000 Scale Using Satellite Data of 1989-1991 and 2004-2006 Time Frames
Abstract Views :242 |
PDF Views:114
Authors
A. S. Rajawat
1,
H. B. Chauhan
1,
R. Ratheesh
1,
S. Rode
1,
R. J. Bhanderi
1,
M. Mahapatra
1,
Mohit Kumar
1,
R. Yadav
2,
S. P. Abraham
3,
S. S. Singh
2,
K. N. Keshri
2,
Ajai
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Central Water Commission, Ministry of Water Resources, New Delhi 110 606, IN
3 Central Water Commission, Ministry of Water Resources, Kochi 682 020, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Central Water Commission, Ministry of Water Resources, New Delhi 110 606, IN
3 Central Water Commission, Ministry of Water Resources, Kochi 682 020, IN
Source
Current Science, Vol 109, No 2 (2015), Pagination: 347-353Abstract
The long stretch of coastline on either side of the Indian peninsula is subjected to varied coastal processes and anthropogenic pressures, which makes the coast vulnerable to erosion. There is no systematic inventory of shoreline changes occurring along the entire Indian coast on 1 : 25,000 scale, which is required for planning measures to be taken up for protecting the coast at the national level. It is in this context that shoreline change mapping on 1 : 25,000 scale for the entire Indian coast based on multidate satellite data in GIS environment has been carried out for 1989-1991 and 2004-2006 time frame. The present communication discusses salient observations and results from the shoreline change inventory. The results show that 3829 km (45.5%) of the coast is under erosion, 3004 km (35.7%) is getting accreted, while 1581 km (18.8%) of the coast is more or less stable in nature. Highest percentage of shoreline under erosion is in the Nicobar Islands (88.7), while the percentage of accreting coastline is highest for Tamil Nadu (62.3) and Goa has the highest percentage of stable shoreline (52.4). The analysis shows that the Indian coast has lost a net area of about 73 sq. km during 1989-1991 and 2004-2006 time frame. In Tamil Nadu, a net area of about 25.45 sq. km has increased due to accretion, while along the Nicobar Islands about 93.95 sq. km is lost due to erosion. The inventory has been used to prepare a Shoreline Change Atlas of the Indian Coast.Keywords
Accretion, Coastal Erosion, Shoreline Changes, High and Low Tide Lines, Satellite Data.Full Text
- Occurrence of kornerupine-bearing granulite from Kunjan locality, Salem district, Tamil Nadu, India
Abstract Views :193 |
PDF Views:79
Authors
D. Prakash
1,
C. K. Singh
1,
R. S. Kumar
2,
R. Yadav
1,
S. K. Rai
1,
M. K. Yadav
3,
Pradip K. Singh
1,
S. Jaiswal
1
Affiliations
1 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, IN
3 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
1 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, IN
3 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
Source
Current Science, Vol 121, No 9 (2021), Pagination: 1241-1248Abstract
Kornerupine, although a rare mineral, has been reported from several locations around the world in various types of aluminomagnesian Proterozoic rocks subjected to amphibolite and granulite facies metamorphism. Here we report the occurrence of kornerupine in quartzo-feldspathic gneisses near Kunjan town located in the southwestern part of Salem district, Tamil Nadu, India. These kornerupine granulites show well-preserved retrogression texture, involving hydration reactions which helped develop the various mineral assemblages. The common stable assemblage in these granulites is orthopyroxene–cordierite–kornerupine–biotite–spinel–K-feldspar–plagioclase. The P–T conditions of these granulites have been derived using the winTWQ program, which gives results of ~800°C and ~6 kbar for kornerupine-bearing assemblage. The high P–T assemblage reported from this area bears a significant relationship with the metamorphic history and exhumation of the Salem–Namakkal blockKeywords
Hydration reactions, kornerupine granulites, metamorphic evolution, mineral assemblages, retrogression texture.Full Text
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