Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China

Yang, Kunhua; Han, Guilin; Zeng, Jie; Liu, Bin; Qu, Rui; Liu, Jinke

doi:10.3390/ijerph16244932

Cited by 18 publications

(13 citation statements)

References 47 publications

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“…and Laos) and has extremely low isotopic values (−12.4‰ at Jinghong Dam in China reported byYang et al (2019)). Consequently, the δ 18 O F I G U R E 2 Time series of monthly rainfall (a), river discharge (b), water temperature (c), precipitation δ 18 O (d), and river δ 18 O (e) during 2013-2015 for the region.…”

mentioning

confidence: 88%

“…Under the damming effect, the patterns of F I G U R E 1 0 Spatial plots of (a) the slopes of the local river water lines (LRWL), indicated by circle size and colour. The spatial distribution of annual pan evaporation (mm/year) using the ordinary Kriging method, shown as colour contours, is based on 1039 meteorological stations δ 18 O and d-excess in rivers are changed by water released from the reservoirs (Deng et al, 2016;Li et al, 2016;Yang et al, 2019). The δ 18 O (d-excess) of the corresponding released water was higher (lower) than those of inflowing water ( Figure 5).…”

Section: Evaporation Effect On Runoff Processmentioning

confidence: 99%

“…River water isotopes exhibit seasonal variability because of changes in precipitation sources, precipitation amount, altitude of precipitation, groundwater contributions, and climate conditions such as relative humidity and temperature (Gibson & Reid, 2010; Yang et al, 2019). The effects of these factors on precipitation isotopes have been identified in previous studies and given names such as the altitude effect, temperature effect, and amount effect (Bershaw, 2018; Dansgaard, 1964; Le Duy, Heidbüchel, Meyer, Merz, & Apel, 2018; Pfahl & Sodemann, 2014; Xia et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Isotopic temporal and spatial variations of tropical rivers in Thailand reflect monsoon precipitation signals

Laonamsai

Ichiyanagi

Patsinghasanee³

2021

Hydrological Processes

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Stable isotopic compositions (δ 18 O and d-excess) from 25 rivers in Thailand were analysed monthly during 2013-2015. Results indicated that monsoon precipitation fundamentally influences the river isotopes. The overland flow supplied from monsoon precipitation and human-altered flow regimes produces considerable isotopic variability. Spatial and temporal variations were observed among four principal geographical regions. The seasonality of monsoon precipitation in mountainous Thailand produced large variations in isotopic compositions because most rainfall occurred during the southwest monsoon, and dry conditions prevailed during the northeast monsoon. The northern and northeastern regions are mountainous, highland areas. Low δ 18 O values were found in these regions, likely because of altitude effects on precipitation. Conversely, monsoonal precipitation continually supplies rivers in southern Thailand all year round, producing higher and more consistent δ 18 O values than in the other regions. The Chao Phraya plain in the central region experienced enrichment of δ 18 O river runoff related to evaporation in irrigation systems. Larger catchment areas and longer residence times resulted in more pronounced evaporation effects, producing lower values of d-excess and local river water line slopes compared with precipitation. The isotopic differences between river waters and precipitation were utilized to determine river recharge elevations and water transit time. The methods presented here can be used to explore hydrological interactions in other tropical river basins.

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mentioning

confidence: 88%

Section: Evaporation Effect On Runoff Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isotopic temporal and spatial variations of tropical rivers in Thailand reflect monsoon precipitation signals

Laonamsai

Ichiyanagi

Patsinghasanee³

2021

Hydrological Processes

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“…The differences in δ D and δ 18 O values were closely related to the water circulation process of the recharge source [38,39]. All spots of δ 18 O vs. δD of the karst water and surface water in the study area were located near the global metric water line (GMWL) [40], indicating that precipitation is the main recharge source of groundwater and surface water in the area (Figure 3).…”

Section: Stable Oxygen and Hydrogen Isotopesmentioning

confidence: 88%

Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions

Song

Yang

Wang

et al. 2020

IJERPH

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To provide theoretical support for the protection of centralized drinking groundwater sources in karst areas, it is necessary to accurately identify the development of karst conduits and analyze the differences in hydrogeochemical characteristics of different karst systems. This provides a scientific basis for the accurate designation of risk zones that may cause drinking groundwater pollution. In this study, a geophysical survey, hydrogeological chemical process analysis and optimized fuzzy cluster analysis were used to gradually improve the understanding of karst water systems. AMT and HDR methods were used to calibrate the resistivity around the water-filling karst conduits, which ranged from 39 to 100 Ω·m. A total of seven karst systems were identified, including four karst systems in the north of the study area, one karst system in the west and two karst systems in the south. Analysis of the hydrochemical data showed that HCO3-Ca and HCO3-Mg-Ca types accounted for 90% of all samples. The δD and δ18O values of their main conduits were −51.70‰ to −38.30‰ and −7.99‰ to −5.96‰, respectively. The optimized fuzzy clustering analysis method based on the weight of variables assigned by AHP more accurately verified karst water systems. Based on these findings, the drinking groundwater source risk zone was designated with an area of 33.90 km2, accounting for 34.5% of the study area. This study effectively improved the rationality and accuracy of the designation of drinking groundwater source risk zones in karst areas, and provided a scientific basis for the identification of karst water systems and decision-making of drinking groundwater source protection in karst areas.

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“…The Lancangjiang River is the upper reach of the Mekong River (MR, the world's seventh longest river) and originates from the Qinghai-Tibet Plateau (QTP) in southwest China [22,23]. Natural processes and anthropogenic activities largely release heavy metals into rivers [11,24].…”

Section: Introductionmentioning

confidence: 99%

Spatial Variation and Source of Dissolved Heavy Metals in the Lancangjiang River, Southwest China

Liu

Han

Zeng

et al. 2020

IJERPH

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Dissolved heavy metals are not only the essential micronutrients, but also the toxic elements for human bodies. To investigate the heavy metal sources and assess the water quality of the Lancangjiang River, dissolved Cr, Ni, Cu, Zn, Mo, and Pb were detected in this study. The results show that dissolved Ni and Mo, Cr and Pb, and Cu and Zn were similarly distributed within the drainage basin. The correlation analysis exhibited that dissolved Ni and Mo had correlation with water parameter, and dissolved Cu was weakly correlated with Ni, indicating that they might be affected by natural processes. The principal component analysis explained 68.342% of the total variance for three principal components, of which dissolved Ni, Mo, and Cu were controlled by natural inputs; dissolved Cu and Cr were affected by anthropogenic activities; and dissolved Zn was influenced by agricultural activities in the downstream. The water quality showed that the water in upstream was worse than in midstream and downstream, and the whole drainage basin had water of excellent quality. Water within the drainage basin poses no risks to human bodies via daily diets and dermal routes. Dissolved Zn, Cu, and Mo occupied the major proportion of heavy metals transporting into the Mekong River. The agricultural inputs of dissolved Zn might pose potential risks to the Mekong River.

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Spatial Variation and Controlling Factors of H and O Isotopes in Lancang River Water, Southwest China

Cited by 18 publications

References 47 publications

Isotopic temporal and spatial variations of tropical rivers in Thailand reflect monsoon precipitation signals

Isotopic temporal and spatial variations of tropical rivers in Thailand reflect monsoon precipitation signals

Application of Geophysical and Hydrogeochemical Methods to the Protection of Drinking Groundwater in Karst Regions

Spatial Variation and Source of Dissolved Heavy Metals in the Lancangjiang River, Southwest China

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