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Mondal, N. C.
- Landscape Entropy Approach to Demarcate Pathways for Oozing of Water in a Desert Area in India
Abstract Views :217 |
PDF Views:104
Authors
N. C. Mondal
1,
S. Ahmed
1
Affiliations
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 109, No 1 (2015), Pagination: 148-157Abstract
Oozing of groundwater in Jodhpur city in the desert area of Rajasthan, India has caused weakening of foundations and cellars of buildings and shops. It has become more significant since 1996 when Kaylana lake was connected with Rajiv Gandhi Lift Canal (RGLC) water supply and filling of the lake had started. This has resulted in fear among dwellers about any future calamity. The hydrogeological, hydrochemical and isotopic studies clearly indicated that the lake water is responsible for the oozing phenomenon in the area. This article highlights a landscape entropy approach to assess pathways causing rise in the level of groundwater integrating the measured lake water level and groundwater table in a few selected wells in the city. With the fractional information of lake water and groundwater, marginal entropies of lake water and depths to groundwater in the selected wells sites are calculated. Mutual information, on common uncertainty associated in the measurements of lake water and groundwater, is also provided. Subsequently, ratios of mutual information to marginal entropy of the lake water are used as a measure for demarcating the pathways of weak zones, which correlate well with the lineaments delineated from satellite imagery. The results of this study represent a base for additional insight on future work, which will help in tracing the connectivity of weak zones causing oozing of water in Jodhpur city, and evolving a plan for remedial measures.Keywords
Desert Area, Landscape Entropy, Marginal Entropy, Oozing of Water.Full Text
- Estimation of Aquifer Parameters from Surfacial Resistivity Measurement in a Granitic Area in Tamil Nadu
Abstract Views :245 |
PDF Views:103
Authors
Affiliations
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Water and Environmental Division, Department of Civil Engineering, National Institute of Technology, Warangal 506 004, IN
1 Aquifer Mapping Group, CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 Water and Environmental Division, Department of Civil Engineering, National Institute of Technology, Warangal 506 004, IN
Source
Current Science, Vol 111, No 3 (2016), Pagination: 524-534Abstract
This article aims to establish an empirical relationship among geoelectrical properties of aquifer and hydrogeological parameters to estimate its hydraulic properties, and reduce the processes of pumping test, which are costly and time consuming. A total of 19 Vertical Electrical Sounding (VES) data were collected using Schlumberger configuration in a granitic terrain in Tamil Nadu. The geographical parameters were analysed with IX1-D v.3 Interprex software. The pumping test conducted on nearby open wells was also used. A cross-correlation test was ascertained between hydraulic conductivity (K) and aquifer resistivity (ρ). It was found that hydraulic conductivity is best defined as an exponential function of aquifer resistivity. The field parameters, A = 20.235 and B = 0.012, of the function were optimized by using 'Solver', with the least SSQ (=7.82) and MARE (=0.816). It helped to estimate hydraulic parameters along with an empirical equation without pumping test data. The results emphasized the potential of surfacial resistivity survey in granitic area to determine aquifer properties where well information is not available.Keywords
Field Parameters, Granitic Terrain, Geoelectrical Properties, Hydraulic Conductivity, Shallow Aquifer.Full Text
- Estimation of Vulnerability of Groundwater in a Granitic Aquifer to Pollution using Entropy Theory
Abstract Views :208 |
PDF Views:75
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 116, No 9 (2019), Pagination: 1555-1559Abstract
Entropy theory was used to estimate the vulnerability of groundwater aquifer to pollution which could have a degree of uncertainty of liable different dynamic systems. Mainly three parameters such as precipitation, groundwater level, and total dissolved solids in groundwater in a granitic area from Peninsular India are considered and tested. Results show that interaction entropy is comparatively higher in high risk vulnerability zone, whereas it is lower to negligible in low risk vulnerability areas. Therefore, the risk areas of groundwater pollution could be demarcated by virtue of interaction entropy, which provided the same outcomes as achieved on the DRASTIC map. The significance of this work is in evaluating the degrees of aquifer vulnerability for groundwater pollution. An aquifer vulnerability map could be prepared for the whole country by selecting suitable sites for the development of industries.Keywords
Entropy Theory, DRASTIC Map, Estimation Aquifer Vulnerability, Groundwater Pollution, Peninsular India.Full Text
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- Mondal, N. C., Bhuvaneswari Devi, A., Anand Raj, P., Ahmed, S. and Jayakumar, K. V., Estimation of aquifer parameters from surfacial resistivity measurement in granitic area in Tamil Nadu. Curr. Sci., 2016, 111(3), 524–534.
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