Seasonality in groundwater recharge in Coastal Southwestern India and its hydrological implications based on stable isotopes (δ18O, δD)

نویسندگان

چکیده

This study observes and interprets the spatio-temporal variation in oxygen hydrogen isotopic composition (δ18O, δD) of shallow groundwater Southwestern Coastal state India, Kerala, terms seasonally varying rainfall, physiography, hydrogeological settings this region. identifies effective recharge sources their relative contributions provides first-order estimates submarine discharge by interpreting variations stable isotopes groundwater, collected from 225 locations for pre-monsoon post-monsoon seasons conjunction with rainfall. Spatio-temporal δ18O d-excess, other data, reveals that: (1) ∼4.9 Billion Cubic Meter (BCM) fresh water rainfall during May to October mixes ∼5.9 BCM residual across Kerala. (2) ∼ 11% area Kerala is additionally recharged NE monsoon (3) The annual varies physiographically ∼2.2 lowland ∼1.5 midland ∼1.2 highland regions. (4) On an basis, 41% replenishable drained as SGD into Arabian Sea.

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ژورنال

عنوان ژورنال: Physics And Chemistry Of The Earth, Parts A/b/c

سال: 2023

ISSN: ['1474-7065', '1873-5193']

DOI: https://doi.org/10.1016/j.pce.2023.103396