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Identification of groundwater mean transit times of precipitation and riverbank infiltration by two-component lumped parameter models

Le Duy, NguyenORCIDiD
Dung, Nguyen Viet
Heidbüchel, Ingo
Meyer, HannoORCIDiD
Weiler, MarkusORCIDiD
Merz, BrunoORCIDiD
Apel, Heiko
DOI: https://doi.org/10.1002/hyp.13549
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9404
Le Duy, Nguyen; Dung, Nguyen Viet; Heidbüchel, Ingo; Meyer, Hanno; Weiler, Markus; Merz, Bruno; Apel, Heiko, 2019: Identification of groundwater mean transit times of precipitation and riverbank infiltration by two-component lumped parameter models. In: Hydrological Processes, Band 33, 24: 3098 - 3118, DOI: 10.1002/hyp.13549.
 
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  • Abstract
Groundwater transit time is an essential hydrologic metric for groundwater resources management. However, especially in tropical environments, studies on the transit time distribution (TTD) of groundwater infiltration and its corresponding mean transit time (mTT) have been extremely limited due to data sparsity. In this study, we primarily use stable isotopes to examine the TTDs and their mTTs of both vertical and horizontal infiltration at a riverbank infiltration area in the Vietnamese Mekong Delta (VMD), representative of the tropical climate in Asian monsoon regions. Precipitation, river water, groundwater, and local ponding surface water were sampled for 3 to 9 years and analysed for stable isotopes (δ18O and δ2H), providing a unique data set of stable isotope records for a tropical region. We quantified the contribution that the two sources contributed to the local shallow groundwater by a novel concept of two-component lumped parameter models (LPMs) that are solved using δ18O records. The study illustrates that two-component LPMs, in conjunction with hydrological and isotopic measurements, are able to identify subsurface flow conditions and water mixing at riverbank infiltration systems. However, the predictive skill and the reliability of the models decrease for locations farther from the river, where recharge by precipitation dominates, and a low-permeable aquitard layer above the highly permeable aquifer is present. This specific setting impairs the identifiability of model parameters. For river infiltration, short mTTs (<40 weeks) were determined for sites closer to the river (<200 m), whereas for the precipitation infiltration, the mTTs were longer (>80 weeks) and independent of the distance to the river. The results not only enhance the understanding of the groundwater recharge dynamics in the VMD but also suggest that the highly complex mechanisms of surface–groundwater interaction can be conceptualized by exploiting two-component LPMs in general. The model concept could thus be a powerful tool for better understanding both the hydrological functioning of mixing processes and the movement of different water components in riverbank infiltration systems.
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  • Geographie, Hydrologie [351]
Subjects:
bank infiltration
groundwater
lumped parameter model
mean transit time
Mekong Delta
stable isotopes
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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