Geological significance of delineating paleochannels with AEM

Subash Chandra, Joy Choudhury, Pradip K. Maurya, Shakeel Ahmed, Esben Auken, Saurabh K. Verma

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

Paleochannels typically act as pathways for groundwater movement and provide a potential source of groundwater. Their presence can be helpful in identifying areas suitable for recharge and at times in mitigating contamination problems in afflicted regions. Thus, mapping of paleochannels is significant in the planning and management of groundwater resources. An airborne electromagnetic (AEM) system employing dual pulse moments has been used extensively for this purpose in India. This paper presents the results over paleochannels defined in three different terranes. In northwest India, a 100 m wide by 80 m deep paleochannel within alluvium overlaying a Proterozoic basement illustrates the impact of neotectonic disturbances in changing the river course. In northeast India’s Ganga Plains, a paleochannel is mapped that provides insight into managing groundwater resources of areas polluted with arsenic. In south India, a paleochannel buried under ∼ 100 m thick sequence of coastal sediments is imaged with implications on submarine groundwater discharge.

Original languageEnglish
Pages (from-to)74-83
Number of pages10
JournalExploration Geophysics
Volume51
Issue number1
DOIs
Publication statusPublished - 2 Jan 2020
Externally publishedYes

Keywords

  • 3D modelling
  • Airborne geophysics
  • aquifer
  • hydrogeology
  • mapping
  • tectonics

Programme Area

  • Programme Area 2: Water Resources

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