Abstracts of Volume 7 Issue 4, 2017

INTERNATIONAL JOURNAL OF GEOMATICS AND GEOSCIENCES

VOLUME 8, NO 1- 2018 - January 2018

ABSTRACTS

Sub-watershed prioritization based on potential zones of Kuttiadi river basin, A Geo-Morphometric approach using GIS

Author(s) - Sumesh. K, Vijayan. P.K

ABSTRACT

Natural potential zones of river basin provide an insight to developmental activities especially in rural areas. The present work is to identify the potential zones of sub-watersheds of Kuttiadi river basin.  The Kuttiadi river basin is been divided into 47 sub-watershed and morphometric features of all sub-watersheds are calculated using Geographic Information System Technique using ArcGIS-10 software. The sub-watersheds were ranked according the value of morphometric parameters. Average of these ranking were used to classify sub-watersheds in three potential zones namely high, medium and high. The lineament, geology, geomorphology, slope and soil parameters of Kuttiadi river basin were also taken into consideration for the prioritization. The feature class data converted to raster based on assigned rank. Weighted sum of the raster layers reveals the potentiality of the each sub-watersheds of the river basin. Based on the potentiality the potential zones of sub-watersheds has been identified and quantified.

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Deformational features of intraformational para-conglomerate of the Paleoproterozoic Sanvordem Formation, Goa Group indicates a brittle-ductile dextral shear

Author(s) - Gadgil R, Miranda M. A, Viswanath T. A

ABSTRACT

Structures at outcrop and microscale have been studied of an intraformational para-conglomerate that belongs to the basal section of Sanvordem Formation of the Goa Group of rocks. The mylonitic foliation plane is sub vertical striking NNW-SSE with steep easterly dips. High viscosity contrast between the clasts and the chlorite-biotite rich matrix have rendered a unique texture to the rocks. The elliptical rounded to subrounded microscopic to boulder size clasts have been flattened and subjected to subsequent shearing. Outcrop scale structures abound in mantled clasts with “bearded” and recrystallized “tails” along with detached/stretched pebbles parallel to foliation. Chlorite-biotite rich matrix has suffered maximum deformation and recrystallization. Quartz grains show high degree of internal strain as evidenced by undulatory extinction and subgrain formation. Quartz fish and ribbons also occur abundantly. The quartzofelspathic clasts are rimmed by dynamically recrystallized finer grained mineral aggregates. Mantled lithoclasts indicate ductile deformation in response to flow in the matrix. The porphyroclasts of quartz, alkali feldspar and calcite are round to sigmoid in outline with beards of neocrystallized fibrous minerals i.e. muscovite, chlorite, quartz and calcite. However, these minerals also exhibit effects of brittle deformation such as displaced twin lamellae in plagioclase and microfaulting of quartz and calcite porphyroclasts. The structures indicate Top-to-E (down) dextral shear. Microscopic structural features have been used as temperature gauges. Width of twinned lamellae in calcite, ductile behavior of biotite, brittle fracturing of plagioclase and alkali feldspar, dynamic recrystallization and BLG in quartz, indicate that the rock has undergone mylonitization occurring at a transition zone of brittle-ductile regime within a temperature range of 200-450° C.

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Land Use Land Cover Mapping with Change Detection: A Spatio-temporal Analysis of NCT of Delhi from 1981 to 2015

Author(s) - Shahnaz Parveen, Susmita Sarkar

ABSTRACT

Land in urban areas is scarce. There is heavy competition amongst all users of urban a rapid transformation of Land use Land cover (LULC) and inter transferability of one land use function to another is apparent. The NCT of Delhi (India) undergoing rapid urbanization and rapid urban transformation furnishes one of the best examples of the above phenomena. Therefore, the main objective of the present study is to map and monitor the land use land cover (LULC) on one hand and to detect the patterns of LULC changes in spatio-temporal perspective on the other from 1981 to 2015. The study is based upon remote sensing data of Landsat 3(1981) and Landsat 8(2015) multispectral images for the study area. The supervised classification based on maximum likelihood classifier has been used to identify the four major categories of LULC modified from National Urban Information System (NUIS) Standards. The study shows that from 1981 to 2016 the land resources are affected adversely, vegetation cover from 41 percent of the total geographical area of NCT of Delhi in 1981 has recorded a decline of 23 percent in 2015, a decrease of about 50 percent during a span of 34 years. While open area in the above period has decreased to 9% in 2015 from 16% in 1981. The built up has expanded from 42 to 66% mostly at the cost of vegetation cover. The classification accuracy has been established through K_hat statistics showing 0.84 and 0.79 for 1981 and 2015 respectively

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