Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

V. Ramesam

Abstract

No Abstract.

Full Text

     

V. Ramesam ¹

Affiliations
1 Department of Science and Technology, New Delhi, IN

Abstract

No Abstract.

Full Text

   

V. Ramesam ¹, A. Achutha Rao ¹

Affiliations
1 Central Groundwater Board, Vedavati River Basin Project, No.2, 8th Block, 36th Cross, Jayanagar, Bangalore-560041, IN

Abstract

Of all the modern Remote Sensing Techniques, multi-spectral (MSS) imagery taken through satellites is proving to be a highly useful reconnaissance tool for earth resources evaluation studies. The synoptic view of the changes in the areal spread of surface water reservoirs, soil moisture zones etc., as provided by the repeat imageries is of particular significance to hydrologists. Though the repeat imageries were used to monitor flood effects, there does not seem to be much effort in using them for estimating the component of surface water change in the hydrological balance.

This paper illustrates an approach to estimate the changes in surface water storage in 7300 sq km of the Bhairavanithippa catchment (a part of the Vedavati River Basin) in parts of Karnataka and Andhra Pradesh. The study indicates that the depression storage in a normal rainfall year may be around 95 MCM and in a drought year as low as 26 MCM. The Sources of error in these estimates can be lessened to a great extent by a Man-Machine interaction.

Full Text

     

V. Ramesam

Abstract

No Abstract.

Full Text

   

V. Ramesam ¹

Affiliations
1 Central Groundwater Board, 36th Cross, 8th Block, Jayanagar, Bangalore-560041, IN

Abstract

The acid insoluble < 2μm size fraction of 22 sandstones, 36 shales and 15 limestones from the largest exposed section of the Dunkard sediments was analysed by X-ray diffraction for the clay minerals and by spectrographic methods for trace elements. After verification of the precision and accuracy in the data, the results were statistically processed.

Vermiculite, kaolinite, illite, chlorite and mixed layer lattice minerals are the principal clay minerals identified. Montmorillonite was identified only in two samples out of 75 and corrensite in a single sample. The clay mineralogy appears to have been diagenetically altered particularly in sandstones. The migration and incorporation of trace elements into the clay minerals differ with the lithological type being deposited irrespective of the clay mineralogy. Ni and Cr seem to be present in vermiculite. Fe in the < 2 μm fraction of sandstones seems to have been dispersed by more than one process. The K/Rb, Ga/Ti ratios have distinct ranges for each of the lithologies.

Compared with crustal abundance values (Taylor, 1964), the average Dunkard rock has higher K, Rb, Mn, Ga, Y, Ni, Sc and Cr, and lower Ti, Fe, V, Zr, Cu, Co and Sr values.

Full Text

     

V. Ramesam

Abstract

No Abstract.

Full Text

   

V. Ramesam

Abstract

No Abstract.

Full Text

   

V. Ramesam ¹

Affiliations
1 Central Groundwater Board, 8th Block, Jayanagar, Bangalore 560 082, IN

Abstract

No Abstract.

Full Text

   

V. Ramesam

Abstract

No Abstract.

Full Text

   

V. Ramesam ¹

Affiliations
1 Central Ground Water Board, Hyderabad, IN

Abstract

No Abstract.

Full Text

   

V. Ramesam

Abstract

No Abstract.

Full Text

   

V. Ramesam ¹, K. Rajagopalan ¹

Affiliations
1 Central Ground Water Board, Hyderabad, IN

Abstract

The Vedavati River Basin falling in the central part of Peninsular India is a typical drought prone hard-rock terrain. Many places in it show high fluoride content (maximum 11 ppm) in the ground waters. Detailed studies on the distribution and geochemistry of fluoride were conducted in the basin between 1974 and 1979. User oriented map showing fluoride distribution giving mean and standard deviation is compiled. The leachable fluoride in the soils is more significant in contributing the fluoride-rich water rather than the mere presence of fluoride-bearing minerals in the rock.

Full Text

     

V. Ramesam ¹

Affiliations
1 1049, Sector IV, R. K. Puram, New Delhi 110022, IN

Abstract

Based on different methods of quick quantitative appraisal, the recharge to the groundwater body is estimated to be around 150 mm per unit area per annum. The potential evapotranspiration varies from 1170 mm to 1340 mm. The run off is about 1 MCM per sq. km per annum in the Maha Oya basin and decreases to 0.4 MCM per sq. km per annum in the Deduru Oya basin. Unclassified granite gneisses, khondalites and charnockites occur over alargc part of the area. Groundwater occurs in the weathered and fractured parts of the hard rocks and in the intergranular pore spaces in the Quaternary formations under unconfined to semi-confined conditions. The water levels vary from 1 m to 15 m below ground level. The groundwater recharge occurs two times in a year - in May-June and again in November-December. The quality of water is good with tbe electrical conductivity being Jess than 300 micromhos/cm at 25°C.

Keywords

Coconut Triangle, Groundwater, Sri Lanka.

Full Text

     

V. Ramesam ¹

Affiliations
1 Department of Science and Technology, New Delhi, IN

Abstract

No Abstract.

Full Text

     

V. Ramesam ¹

Affiliations
1 Department of Science and Technology New Delhi-110 016, IN

Abstract

No Abstract.

Full Text