Spatiotemporal variation of the surface water effect on the groundwater recharge in a low-precipitation region: Application of the multi-tracer approach to the Taihang Mountains, North China

Sakakibara, Koichi; Tsujimura, Maki; Song, Xinshan; Zhang, Jie

doi:10.1016/j.jhydrol.2016.12.030

Cited by 37 publications

(28 citation statements)

References 65 publications

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“…Precipitation isotope ratios may be modified by a range of processes before water is sampled from taps. Natural flows within surface water systems may modify the spatial distribution of isotope ratios (Bowen et al, ; Dutton et al, ), and mixings within surface and groundwater systems may damp seasonal variation in precipitation isotope inputs (Sakakibara et al, ). Where ancient groundwater, recharged under different climate conditions, is used, the isotope ratios of extracted water may be quite different from (usually lower than) modern precipitation values (Jiráková et al, ).…”

Section: Resultsmentioning

confidence: 99%

Water Source Signatures in the Spatial and Seasonal Isotope Variation of Chinese Tap Waters

Wang

Zhang

Bowen

et al. 2018

Water Resources Research

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Different water sources exploited for public use have different exposure to risks associated with climatic and environmental change. Isotope ratios of tap water have previously been studied as a potential tool to link public supply waters with water source characteristics at local to continental scales, providing information on the footprint of and potential risks associated with the water sources used. Work that combines intensive spatial and temporal sampling with independent water management data has been limited, however. In this study, an extensive observation network was established during 2014–2016 to provide monthly tap water sampling across China. We show that the spatial distribution of annual mean tap water isotope ratios is generally consistent with that of local precipitation across China. We identify seasonal correlation between tap water and precipitation isotope ratios in south China, where use of surface water is prevalent. In contrast, relatively invariant tap water isotope ratios elsewhere in China, which are not correlated with seasonal variation of precipitation isotope ratios, can be attributed to use of groundwater or water from river basins with longer storage times. The tap water isotope signatures identified here could be widely applied to characterize water supplies and associated sustainability challenges in different regions worldwide.

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Section: Resultsmentioning

confidence: 99%

Water Source Signatures in the Spatial and Seasonal Isotope Variation of Chinese Tap Waters

Wang

Zhang

Bowen

et al. 2018

Water Resources Research

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“…The dominant land covers are forest and grass, with less than 2% of urban areas (Li et al, ). The long‐term annual precipitation in Wangkuai reservoir catchment ranges from 220 to 1000 mm, with an average of 640 mm (Sakakibara et al, ). More than 60% of the total precipitation occurs between June and September due to the East monsoons (Song et al, ).…”

Section: Study Area and Datamentioning

confidence: 97%

Three resampling approaches based on method of fragments for daily‐to‐subdaily precipitation disaggregation

Meshgi

Wang³

et al. 2018

Intl Journal of Climatology

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Precipitation data of finer timescale and higher spatial density are crucial for continuous hydrological modelling and flood risk assessment. Disaggregation methods are often used to transform the coarser‐timescale precipitation data into finer resolutions. The nonparametric approach based on method of fragments (MOF) has received broad attention in precipitation disaggregation literature, given its superiority in reproducing the at‐site statistical attributes. However, a detailed literature review has shown that the MOF‐based resampling approaches are mainly focused in the single‐site precipitation disaggregation context, which may subject to limitations such as the unavailability of at‐site precipitation records and the incapability to preserve the inter‐site correlation structure. To address these issues, we propose three resampling approaches based on MOF. The first approach is a single‐site interval‐based resampling approach which only draws subdaily fragment vectors from at‐site record. The second one extends the first one to a regionalized version where subdaily fragment vectors are drawn from both the at‐site and neighbouring stations. The third one is a multi‐site approach developed to preserve the observed inter‐site correlation. The performances of the three methods are evaluated with applications to daily‐to‐hourly precipitation disaggregation at six rain gauges in Singapore and eight precipitation stations in Wangkuai reservoir catchment in northern China. An elaborate list of performance measures, including standard validation statistics, spatial correlation, inter‐day connectivity, annual extreme analysis, and intra‐day dry and wet spell characteristics are used to assess the performance. The proposed three methods are shown to be effective in reproducing the at‐site attributes, and no significant deterioration of performance is observed when moving from the single‐site method to the regionalized and multi‐site versions. As expected, the multi‐site approach is the only one method that is able to reconstruct the spatial correlation in the disaggregated precipitation field. The approaches can be applied for daily‐to‐subdaily precipitation disaggregation in different regions.

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“…Healy and Scanlon, 2010;McGuire and McDonnell, 2006;Sakakibara et al, 2017), quantifying root water uptake (e.g. Ehleringer and Dawson, 1992;Dawson et al, 2002;Volkmann et al, 2016;Rothfuss and Javaux, 2017), and identifying plant water sources (e.g.…”

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confidence: 99%

Effects of climatic seasonality on the isotopic composition of evaporating soil waters

Benettin¹,

Volkmann²,

Freyberg³

et al. 2018

Preprint

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Abstract. Stable water isotopes are widely used in ecohydrology as tracers of the transport, storage, and mixing of water on its journey through landscapes and ecosystems. Evaporation leaves a characteristic signature on the isotopic composition of the water that is left behind, such that in dual-isotope space, evaporated waters plot below the Local Meteoric Water Line (LMWL) that characterizes precipitation. Soil and xylem water samples can often plot below the LMWL as well, suggesting that they have also been influenced by evaporation. These soil and xylem water samples frequently plot along linear trends 5 in dual-isotope space. These trendlines are sometimes termed "evaporation lines" and their intersection with the LMWL is sometimes interpreted as the isotopic composition of the precipitation source water. Here we use numerical experiments based on established isotope fractionation theory to show that these trendlines are often by-products of the seasonality in evaporative fractionation and in the isotopic composition of precipitation. Thus, they are often not true evaporation lines, and, if interpreted as such, can yield highly biased estimates of the isotopic composition of the source water.

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Spatiotemporal variation of the surface water effect on the groundwater recharge in a low-precipitation region: Application of the multi-tracer approach to the Taihang Mountains, North China

Cited by 37 publications

References 65 publications

Water Source Signatures in the Spatial and Seasonal Isotope Variation of Chinese Tap Waters

Water Source Signatures in the Spatial and Seasonal Isotope Variation of Chinese Tap Waters

Three resampling approaches based on method of fragments for daily‐to‐subdaily precipitation disaggregation

Effects of climatic seasonality on the isotopic composition of evaporating soil waters

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