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Geoscience e-Journals





An International Year of Planet Earth-2008 Initiative

Current Issue Technical

Year 2020

Volume 13 (1)

Detection of Subsurface Fracture System by Vertical Electrical Soundings (VES) and Radial Vertical Electrical Soundings (RVES) in Hard Rock Terrain-A Case Study of Jagtial District, Telangana, India
Ramadass, G., Alekhya, K. and Udayalaxmi, G.
Abstract The electrical resistivity studies were carried out in the Jagtial District, Telangana state, India. Vertical Electrical Soundings (VES) using Schlumberger configuration was conducted to determine the subsurface fracture characteristics and Radial Vertical Electrical Soundings (RVES) to determine anisotropic properties of fractures for sustainable ground water development within in the study area.
The direction of electrical anisotropy was derived from the Vertical electrical soundings (VES) and radial vertical soundings (RVES). The polar plot lies predominantly NW-SE and NE-SW. Coefficient of anisotropy ranges between 0.9 to 8.15. The apparent anisotropic graphs show the behavior pattern of the fracture with depth and reveal the prominent fractures in the areas are closing with depth. In anisotropic directions and high coefficients of anisotropy indicate intense fracturing, thus potential sites for the drilling of water borehole.
Keywords: Anisotropy, Radial Vertical Electrical Sounding (RVES), Fractures, Groundwater
Trend Analysis of Annual and Seasonal Time Series over the Last 46 Years in Asan Watershed, Doon Valley Based on Gridded Data Se
1Ankita Sharma, 2Bhaskar R. Nikam, 3D.S. Bagri and4Deepak Kumar


The study is carried out with changing long-term trend and variation in one of the significant climatic element. The daily gridded rainfall data of spatial resolution 0.25°x 0.25°, for the last 46 years i.e. 1970-2015, has been processed for the Asan watershed located in Doon Valley, Uttarakhand. The non-parametric Mann-Kendall (MK) test together with Sen’s Slope Estimator has been used for the determination of trend and slope magnitude in the watershed respectively. The gridded statistics of annual and seasonal precipitation trends have been studied here to achieve the objective. It has been observed that the magnitude of precipitation in annual and monsoonal time series are increased for all grids except for grid 6 and 8 which show a decreasing trend. The Post Monsoon time series shows a decreasing trend in all grids except for grid 6 which show positive whereas both the summer and winter rainfall show increasing trend except for grid 6. The Coefficient of variability shows variation for annual and seasonal rainfall suggesting overall insignificant changes in the area.
Keywords: Statistical trend analysis, Mann-Kendall test, Sen’s slope estimator, Rainfall variability, Watershe

Climate and Structurally Controlled Markandeya River Basin, Belgavi District, Karnataka, India delineated through Morphometry and Hypsometry: A GIS and Remote Sensing Approach
Milind A. Herlekar1, Abhishek Wadke1, Ganesh Dagade1 and Preveen Gavali2

Morphometry and hypsometry analyses are important tools in planning and developing management programs for river basins, soil and water conservation and natural resources management of river basins. These tools were used to evaluate the climate and structural control over Markandeya river basin (MRB) of northern part of Karnataka state, India. The basin stretches over Kaladgi Supergroup of rocks, Deccan Traps and laterites. The present paper evaluates morphometric parameters viz., linear, aerial and relief aspects of MRB by Geographical Information System (GIS) and Remote sensing techniques. The MRB is a structurally controlled basin, which has been delineated into 30 sub-basins. Majority of the sub-basin has low drainage density, reveals most of the rainfall infiltrates into the ground. In MRB all 3rd, 4th, and 5th order sub-basins have been coarse and very coarse texture, except Bellari nala which has a fine texture. The computed value of form factor, circularity and elongation ratio suggests that the MRB has elongated in shape and flatter peak flows for longer duration.    Hypsometric analysis carried out using 30m ASTER DEM revealed nine subbasins are early youth geomorphic stage; and four sub-basins of late youth stage are influenced by neotectonic activities. Ten sub-basins are approaching early mature stage, and five sub-basins late mature stage. These fifteen sub-basins are experiencing more erosion; these sub-basins are lying within tropical climate zone. The MRB shows old or monadnock stage. The denudational history is understood through basin relief, revealing sub-basins of moderate to high relief.
Keywords: Morphometry, Hypsometry analysis, GIS and Remote Sensing, Markandeya River Basin.