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Kukillaya, J. P.
- Use and Limitations of Short and Medium Duration Pumping Tests in Understanding Hard Rock Fracture Aquifers - An Example from Kerala
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Authors
Affiliations
1 IX 695C, "Chetas", Erattakannanpalam, Talap, Pallikunnu P.O., Kannur, Kerala, IN
2 Kerala Samuhya Jalasechana Samithy, Thrissur - 5, Kerala, IN
1 IX 695C, "Chetas", Erattakannanpalam, Talap, Pallikunnu P.O., Kannur, Kerala, IN
2 Kerala Samuhya Jalasechana Samithy, Thrissur - 5, Kerala, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 3 (1999), Pagination: 267-277Abstract
Short and medium duration pumping test data from a well-field, in conjunction with outcrop fracture pattern studies, are used to understand the nature of a system of fracture aquifers in a metamorphic terrain in Kerala State. Satellite imagery shows a minor E - W lineament intersecting a major regional NNW - SSE lineament in the area. Drawdown and time lag data indicate greater connectivity along the minor lineament compared to the major one. The E - W elongation of the drawdown contours correlates with dominant E - W fracture sets seen on outcrops. The NNW - SSE fracture zone probably forms a regional conduit for groundwater flow, with the degree of hydraulic. connectivity modified locally by other intersecting fracture zones. A large-scale heterogenity in the form of an E-W fracture zone is indicated in this area. The pumping tests give responses similar to double-porosity and semi-confined models. Some data suggest localised linear flow near pumped well. Heterogeneity in fracture distribution results in a complex response to pumping. Celtain broadly-defined zones and groundwater flow conditions are discernible within this heterogeneity.Keywords
Groundwater, Fractured Aquifers, Hard Rock Terrain, Pumping Test, Kerala.- Characteristic Responses to Pumping in Hard Rock Fracture Aquifers of Thrissur, Kerala and their Hydrogeological Significance
Abstract Views :188 |
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Authors
Affiliations
1 Kerala Samuhya Jalasechana Samithi, Thrissur, IN
1 Kerala Samuhya Jalasechana Samithi, Thrissur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 5 (2007), Pagination: 1055-1066Abstract
Pumping test data in the hard rock fracture aquifers of Thrissur district has revealed certain characteristic responses. Thirtytwo percent of the test data shows simultaneous recharge to the aquifer during pumping. Interconnection between phreatic and fracture aquifers and recharge from the phreatic zone to the fracture zone are indicated. Responses similar to double-Porosity model are attributed to probable large variations in fracture scales. Another characteristic response is that of a continuous slope increase in semi-Log plots of drawdown, indicating linear fracture zones with barrier boundaries on both sides. Geological features and good fracture connectivity support this inference. Similarity with the response of a homogeneous anisotropic aquifer is also seen when responses over a large area are considered. Large spatial variations in specific capacity indicate heterogeneity. Tests suggest turbulent flow around pumped wells. Small-Scale fracture networks and the phreatic zone probably have a greater role in determining the groundwater potential of hard rock areas as compared to the few large-Scale fractures. The responses suggest that the fracture aquifers in the area have only limited potential.Keywords
Groundwater, Fracture Aquifer, Hard Rock, Pumping Test, Hydrogeological Significance, Thrissur, Kerala.- Occurrence of Brackish Groundwater in Fractured Hard Rock Aquifers of Puzhakkal-Avanur Area in Thrissur, Kerala
Abstract Views :188 |
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Authors
Affiliations
1 TC 5/1184(2), 'Chandrika Vilas' Survey School Road, Peroorkada PO, Trivandrum - 695005, IN
2 Hydrogeologists, Kelala Samuhya Jalasechana Samithi, Thrissur, Kerala, IN
1 TC 5/1184(2), 'Chandrika Vilas' Survey School Road, Peroorkada PO, Trivandrum - 695005, IN
2 Hydrogeologists, Kelala Samuhya Jalasechana Samithi, Thrissur, Kerala, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 1 (2004), Pagination: 32-42Abstract
Brackish groundwater occurs in fractured hard rock aquifers along a narrow N-S fracture zone in Puzhakkal-Avanur area which is more than 17 km from the sea. Relative propoition of chloride and bicarbonate suggests intrusion of saline water into this fracture zone from low lying areas connected to saline backwaters. Pumping test data and variations in intensity of fracturing suggest similarity to discontinuous fracture network model. The possible causes for spatial and temporal changes in electrical conductivity of groundwater are discussed. Present studies indicate overflow of blackish groundwater from the semi confined aquifers through bores in some dug-cum-borewells of the area.Keywords
Groundwater, Fracture Aquifers, Hard Rock Terrain, Brackish Water, Spatial and Temporal Variations, Thrissur, Kerala.- Characterisation of Hard Rock Fracture Aquifer-The Kalleppadam-Oralassery Fracture Zone in Thrissur, Kerala
Abstract Views :169 |
PDF Views:2
Authors
Affiliations
1 Hydrogeologists, Kerda Samuhya Jalasechana Sanithi, Thrissur, IN
1 Hydrogeologists, Kerda Samuhya Jalasechana Sanithi, Thrissur, IN