Insights into the influence of morphology on the hydrological processes of river catchments using stable isotopes

Water isotopes (δ 18 O, δ 2 H) were systematically monitored in two river catchments to investigate the isotopic spatiotemporal variation and the differences between them. The Pinios River Basin (PRB) exhibited lower average δ 18 O and δ 2 H values (−7.9‰ and −50.8‰, respectively) compared to the Ev...

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Bibliographic Details
Published in:Hydrological sciences journal 2023-08, Vol.68 (11), p.1487-1498
Main Authors: Matiatos, Ioannis, Papadopoulos, Anastasios, Panagopoulos, Yiannis, Dimitriou, Elias
Format: Article
Language:English
Subjects:
Bayesian analysis
Catchment area
catchment features
Catchments
Chemical composition
Composition
Correlation analysis
Evaporation
Groundwater
Hydrologic processes
Hydrology
Isotope composition
Isotopes
Local precipitation
Moisture content
Precipitation
Probability theory
River basins
River catchments
river water
Rivers
seasonality
Soil water
spatial evolution
Spatial variability
Spatial variations
Stable isotopes
water isotopes
Water resources
Water resources management
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Summary:Water isotopes (δ 18 O, δ 2 H) were systematically monitored in two river catchments to investigate the isotopic spatiotemporal variation and the differences between them. The Pinios River Basin (PRB) exhibited lower average δ 18 O and δ 2 H values (−7.9‰ and −50.8‰, respectively) compared to the Evrotas River Basin (ERB) (−6.5‰ and −38.2‰, respectively) but higher in range (3.3‰ vs 1.2‰ for δ 18 O, respectively). The Bayesian modelling results showed higher groundwater contribution in the PRB (25-50%) than in the ERB (15-35%) relative to precipitation during the wet period. The isotopic spatial variability was attributed to the influence of local precipitation, evaporation and additional flow pathways (e.g. soil water). The correlation analysis showed that the isotopic composition is controlled by the catchment altitude, slope and discharge. This study highlights the catchment physiographic control on the isotopic composition of rivers, which can support strategies for better water resources management.
ISSN:0262-6667
2150-3435
DOI:10.1080/02626667.2023.2224005