气候变化领域集成服务门户(CCPortal): Geophysical and geochemical studies on sinking stream occurrence in Ayankulam village of South Tamilnadu, India

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DOI	10.1007/s43538-024-00287-w
	Geophysical and geochemical studies on sinking stream occurrence in Ayankulam village of South Tamilnadu, India
	Ravindran, A. Antony; Promilton, A. Antony Alosanai; Kingston, J. Vinoth; Abishek, S. Richard; Aswin, S. K.; Abinaya, R.; Priya, R. Sakthi
发表日期	2024
ISSN	0370-0046
EISSN	2454-9983
英文摘要	The severe monsoon flooding in 2021 exposed the intricate hydrogeological processes affecting groundwater resources near Ayankulam village in the semi-arid terrain of South Tamil Nadu, India. Despite extensive inundation from overflow of the Nambiar canal, the village well remained dry due to diversion of recharge away from shallow aquifers into deeper concealed karst formations present in the underlying calcarenite bedrock. Detailed geophysical surveys utilizing Azimuthal Square array resistivity combined with Magnetotellurics successfully identified and mapped subsurface pathways of sinking streams that rapidly transported surface water vertically into deeper fractured basement aquifers instead of laterally recharging the shallower dug well. Geochemical analysis of groundwater samples collected from wells in the area revealed progressive evolution of ionic compositions along groundwater flow paths dominated by water-rock interactions including carbonate mineral dissolution, silicate weathering, cation exchange and evaporation. Findings indicated that excessive recharge from heavy rainfall events caused accelerated subsurface drainage of fresh groundwater away from inland recharge zones near Ayankulam village towards the coast. This rapid drainage driven by the hydrostatic pressure exerted by the intense monsoon recharge on the highly permeable karst conduit networks buried beneath the low permeability overlying clay-rich soils. The diversion of freshly recharged water from the surface into deeper aquifers before it could reach the shallow dug well resulted in the phenomenon of dry fallout observed in Ayankulam village. This integrated geophysical and geochemical study provided evidence that sinking streams and the complex linkage between shallow and deeper aquifers control groundwater occurrence and movement in the region. The findings emphasize the need for enhanced monitoring and measurement of hydrogeological parameters coupled with integrated water resources management. This is vital for sustainably harnessing water resources amidst growing demands from the increasing population and intensifying climate change pressures that exacerbate rainfall variability.
英文关键词	Sinking Stream; Karst Formation; Intricate; Calcarenite rock and Dry fall out
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001211477600002
来源期刊	PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302468
推荐引用方式 GB/T 7714	Ravindran, A. Antony,Promilton, A. Antony Alosanai,Kingston, J. Vinoth,et al. Geophysical and geochemical studies on sinking stream occurrence in Ayankulam village of South Tamilnadu, India[J],2024.
APA	Ravindran, A. Antony.,Promilton, A. Antony Alosanai.,Kingston, J. Vinoth.,Abishek, S. Richard.,Aswin, S. K..,...&Priya, R. Sakthi.(2024).Geophysical and geochemical studies on sinking stream occurrence in Ayankulam village of South Tamilnadu, India.PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY.
MLA	Ravindran, A. Antony,et al."Geophysical and geochemical studies on sinking stream occurrence in Ayankulam village of South Tamilnadu, India".PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY (2024).