利用氧氢同位素评价渗透的降水和灌溉水弥散和优先流通道

Ma, Baosong; Liang, Xing; Liu, Shaohua; Jin, Menggui; Nimmo, John R.; Li, Jingxin

doi:10.1007/s10040-016-1525-5

Cited by 26 publications

(32 citation statements)

References 74 publications

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“…In small-scale studies, these isotopes are mainly used in methods similar to tracer calibration, to examine the movement of water in soil, and the source of moisture in soil absorbed by plants [7]. Isotopic studies can also be used to monitor groundwater flow in unsaturated porous layers [8] and to understand preferential flow pathways [9].…”

Section: Introductionmentioning

confidence: 99%

Stable Hydrogen and Oxygen Isotopes for Groundwater Sources of Penghu Islands, Taiwan

Yeh

Lee

2018

Geosciences

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This study used stable hydrogen and oxygen isotopes as natural tracers to investigate their isotopic composition in precipitation, and in shallow and deep groundwater in the Penghu Islands in the Taiwan Strait. We aimed to understand the differences and relationships in isotope compositions within various water bodies and to evaluate the source of groundwater recharge. The hydrogen and oxygen isotopic compositions of sampled groundwater are mainly distributed along the meteoric water line in the Penghu Islands, the variations in the distribution range being minor (the δD values are distributed from −48.2‰ to −37.7‰, with a mean value of −43.14 ± 2.4‰; the δ 18 O values are distributed from −6.96‰ to −5.46‰, with a mean value of −6.34 ± 0.34‰). The data suggest that the groundwater is sourced mainly from local precipitation. In addition, a comparison of the hydrogen and oxygen isotopic compositions of groundwater and precipitation in Taiwan shows that the δ values for groundwater are distributed between those for precipitation during the northeast monsoon and the southwest monsoon seasons. However, some of the δ values trends towards the isotopic composition of the precipitation during the southwest monsoon season. Thus, the source of groundwater may have a closer association with precipitation during this time.

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Section: Introductionmentioning

confidence: 99%

Stable Hydrogen and Oxygen Isotopes for Groundwater Sources of Penghu Islands, Taiwan

Yeh

Lee

2018

Geosciences

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“…The groundwater flow direction is consistent with the Manas River flow direction. In the piedmont plain, the unconfined aquifer with saturated thickness more than 650 m is recharged by the Manas River water and is hydraulically connected to the hydrological network in the piedmont plain and north oasis plain (Ma et al, 2018;Wu, 2007). The depth of the piedmont plain unconfined aquifer decreases gradually from south to north and has relatively fresh groundwater with total dissolved solids (TDS) of < 1 g L −1 .…”

Section: Geological and Hydrogeological Settingmentioning

confidence: 99%

“…Groundwater was sampled from wells for irrigation and domestic supply, in which shallow wells were pumped for a minimum of 5 min before sampling and deep wells were active for irrigation for more than 10 days prior to sampling. Surface water sample data (river water, ditch and reservoir water) and groundwater sample data (sample ID are from G30 to G39) were reported by Ji (2016) and Ma et al (2018).…”

Section: Water Samplingmentioning

confidence: 99%

“…1a, b). In particular, pumping from long-screened wells (of which there are over 10 000 boreholes; Ma et al, 2018) makes groundwater mixing most likely to occur. MRTs Figure 1.…”

mentioning

confidence: 99%

“…MRTs Figure 1. Maps showing (a) regional location of the Manas River Basin (modified after Ma et al, 2018), (b) surface water (river, reservoir and irrigation ditch) system (modified after Cui et al, 2007 andJi, 2016) and (c) geological cross section of the study area for A-A line shown in (b).…”

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confidence: 99%

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Application of environmental tracers for investigation of groundwater mean residence time and aquifer recharge in fault-influenced hydraulic drop alluvium aquifers

Jin

Liang

et al. 2019

Hydrol. Earth Syst. Sci.

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Abstract. Investigating groundwater residence time and recharge sources is crucial for water resource management in the alluvium aquifers of arid basins. Environmental tracers (chlorofluorocarbons, 3H, 14C, δ2H, δ18O) and groundwater hydrochemical components are used for assessing groundwater mean residence times (MRTs) and aquifer recharge in fault-influenced hydraulic drop alluvium aquifers in the Manas River basin (China). Aquifers under the Manas River upstream (south of the fault) contains very high 3H activity (41.1–60 TU), implying water recharge affected by the nuclear bomb tests of the 1960s. Carbon-14 groundwater age correlates positively with distance from mountain area (3000–5000 years in the midstream to > 7000 years in the downstream) and groundwater depth, but correlates negatively to a decrease in 3H activity (1.1 TU) and more negative δ18O values. This phenomenon reveals that the source of the deeper groundwater in the semi-confined aquifer is paleo-meteoric recharge. Special attention has been paid to the estimation of MRTs using CFCs and 3H by an exponential piston flow model. The results show that MRTs vary from 19 to 101 years by CFCs and from 19 to 158 years by 3H. MRTs estimated from 3H are much longer than those from CFCs, probably due to the different time lag of liquid (3H) and gas-phase CFCs through the unsaturated zone. The MRTs estimated by CFCs show good correlations with pH and the concentrations of SiO2 and SO42-, which can provide a possible approach to estimate first-order proxies of MRTs for groundwater age. The young water fractions are investigated by the CFC binary mixing method in the south and north of the fault. Relatively modern recharge is found in the south of the fault with young (post-1940) water fractions of 87 %–100 %, whereas in the north of the fault the young water fractions vary from 12 % to 91 %. This study shows that the combination of CFCs and 3H residence time tracers can help in analysing the groundwater MRTs and the recharge sources for the different mixing end-members.

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Characterizing large‐scale preferential flow across Continental United States

Kocian,

Mohanty

2024

Vadose Zone Journal

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Understanding preferential flow (PF) at large scales is critical for improving land management and groundwater (GW) quality. However, limited knowledge of this process, due to soil surface heterogeneity and observational constraints, hampers progress. In this study, we propose estimating effective PF at remote sensing footprint scale (4–9 km) by examining its impact on soil moisture (SM) distribution and shallow groundwater (SGW) table fluctuations (depth 5 m). Effective PF encompasses macropore, funnel, and finger flow pathways influencing SGW table fluctuations. We compiled daily SGW observations (2019–2021) from 19 Continental United States (CONUS) sites through United States Geological Survey. Using inverse modeling in HYDRUS‐1D, SGW data, and climate hazards group infrared precipitation with station data precipitation, we inversely estimated soil hydraulic parameters of the dual‐porosity model (DPM) simulating vertical flow from soil surface to subsurface. Effective PF presence was inferred using three criteria: (1) daily precipitation equal to or exceeding the site‐specific average across multiple (calibration) years, (2) daily observed SGW table increase, and (3) daily difference between observed and DPM simulated SGW tables 50% of the site‐specific root mean square error. Leveraging optimized DPM parameters and associated soil texture, classified PF events, and soil moisture active passive (SMAP L3E) satellite‐based SM, a random forest algorithm with 10‐fold cross validation predicted large‐scale effective PF events. Results indicate seasonal dependence, with spring having the highest occurrence of PF events. The random forest model achieved 98% accuracy in predicting large‐scale PF events, with SMAP SM and saturated hydraulic conductivity (Ks) among the four most impactful variables. Our approach provides a soil hydraulic property, site characteristic, soil texture, and remote sensing‐based generalized tool to analyze large‐scale effective PF.

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利用氧氢同位素评价渗透的降水和灌溉水弥散和优先流通道

Cited by 26 publications

References 74 publications

Stable Hydrogen and Oxygen Isotopes for Groundwater Sources of Penghu Islands, Taiwan

Stable Hydrogen and Oxygen Isotopes for Groundwater Sources of Penghu Islands, Taiwan

Application of environmental tracers for investigation of groundwater mean residence time and aquifer recharge in fault-influenced hydraulic drop alluvium aquifers

Characterizing large‐scale preferential flow across Continental United States

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