Isotope implications of groundwater recharge, residence time and hydrogeochemical evolution of the Longdong Loess Basin, Northwest China

Ling, Xinying; Ma, Jinzhu; Chen, Peiyuan; Liu, Changjie; Juske, Horita

doi:10.1007/s40333-022-0051-7

Cited by 9 publications

(7 citation statements)

References 41 publications

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“…Furthermore, storms tend to be high-intensity and short-duration (Jiang et al 2021a). As expected, vegetation cover mirrors geographical trends on rainfall, spices adapted to arid terrain are predominant in the north, whilst lush, more perennial vegetation is widespread in the south (Ling et al 2022). The water table exhibits extensive variation due to the high time-clustering of rainfall.…”

Section: Study Areasupporting

confidence: 71%

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

et al. 2023

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Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale ne erosion is scarce. Here, we use the sentinel-1A imagery during a rainy season, using the small baseline subset synthetic aperture radar interferometry (SBAS-InSAR) technology to calculate gully erosion for the largest loess plateau in China, the Dongzhiyuan tableland. The results showed that the average and cumulative subsidence rates of the whole study area are 9 mm/year and 6 mm/year respectively, while the subsidence within the gullies reached 160 mm/year and 70 mm/year, which was mainly caused by rainfall and landslides formed by groundwater softening slopes. In addition, erosion was more severe at the bottom of the gully closer to the lower reaches of the watershed, which may be related to the concentrated runoff downstream during rainfall. Interestingly, the erosion deformation was more intense on slopes 20m above the gully bottom caused by groundwater seepage. The results demonstrated the reliable capability of the SBAS-InSAR method in accurately assessing large-scale erosion deformation. IntroductionGully erosion is the low subsidence or sudden sinking of land around a gully due to natural processes (Valentin et al. 2005). It is one of the most dangerous geological hazards (Di Stefano and Ferro 2011) and has signi cant environmental adverse effects (Jin et al. 2021). Furthermore, it increases the likelihood of other geological phenomena like debris ows, and landslides, which can lead to casualties and economic loss, particularly amongst the most vulnerable (Guan et al. 2021;Guo et al. 2021;Jiang et al. 2021b).Interest in gully erosion has increased recently (Garcia-Ruiz 2010) as new tools have been developed for their assessment, such as Global Positioning System (GPS), Unmanned Aerial Vehicle (UAV), and Automated-ground-surveying (Conforti et al. 2011;d'Oleire-Oltmanns et al. 2012;Wu and Cheng 2005). However, these tools allow for only discrete, and relatively sparse measurements in small areas, obtained at high costs that compound with time. Another option is considering Light Detection and Ranging (LIDAR) (Castillo et al. 2012), which is more accurate and can be done quickly, but usually, it is done on a small scale. It places the sensor at a distance that spans usually less than a kilometer from the target resulting in limiting the scale of the assessment. This is a critical shortcoming as gully erosion can be conditioned by processes at the mesoscale (Haregeweyn et al. 2017) making studies at local instances of limited impact. Rather it is critical to monitor deformation in the vicinities of gullies in wide areas (960km 2 ). Synthetic Aperture Radar (SAR) Satellite Images are better suited for area-wide gully erosion assessments. They can be sourced free of charge; there is no need to deploy sensors on the eld; they are available at a relatively high spatial resolution (pixel values ranging between 40 and 80m for the Sentinel Constellation deployed by...

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Section: Study Areasupporting

confidence: 71%

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

et al. 2023

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“…The Group 4 (MB) and Group 10 (D7) samples had the most negative oxygen isotope values of all groundwater samples, as shown in Figure 10a, indicating that the deep groundwater may have been recharged by extreme or intense rainfall (Darling et al, 2003;Xu et al, 2019). The δ 18 O = À11.55 and À 12.23‰ for the MB and D7 samples are inconsistent with the signal of modern precipitation recharge, which may be an early precipitation recharge because the isotopic temperature effect is particularly pronounced in arid and semi-arid regions, and almost 60% of the precipitation in the study area is from summer (Ling et al, 2022). Small rainfall intensities cannot penetrate the thick envelope to form an adequate recharge.…”

Section: Contribution Of Each End Member To Groundwater Recharge Unde...mentioning

confidence: 91%

“…Because the nearby outgoing water recharges near the front edge of the foothill, where the TDS concentration is considerably lower. In contrast, the Ziwu Ridge, which divides the Jinghe and Luohe Rivers in eastern Qingyang, also recharges the Qingyang area with outflow runoff but exhibits a considerably higher TDS concentration, probably because of the hydrogeological conditions and because the Dongzhi Plateau is a relatively independent hydrological unit (Ling et al, 2022).…”

Section: Contribution Of Each End Member To Groundwater Recharge Unde...mentioning

confidence: 99%

Groundwater recharge in typical geomorphic landscapes and different land use types on the loess plateau, China

Chen

et al. 2023

Hydrological Processes

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Land use significantly affects the rate and amount of groundwater recharge. To understand these patterns, stable isotope analyses (δ 2 H and δ 18 O) and hydrochemical methods were employed to study the recharge and evolution of groundwater.MixSIAR Bayesian mixture modelling and statistical regression techniques were utilized to investigate the influence of land-use type on groundwater recharge and to calculate the contribution of various water sources to different groundwater types.These findings are important for effective management and conservation of groundwater resources. The groundwater in all studied areas displayed a magnesium bicarbonate type with notable cation exchange, and also demonstrated the dissolution of carbonate and weathering of silicate. Results from the Bayesian mixture model indicate that 69.3% of the groundwater in the Loess Plateau region was recharged by precipitation, while 86.9% of the groundwater in the loess hilly-gully region was recharged from the surface water. Groundwater recharge was more rapid in the loess hilly-gully region than in the Loess Plateau and was less sensitive to the land use type in the former. Dryland-moderate coverage grassland was found to be most conducive to groundwater infiltration, whereas monotypic dryland and high-coverage grassland inhibited infiltration to some degree. To maintain balanced soil erosion control, an increase the area of moderate-coverage grasslands in the Loess Plateau region is recommended.

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“…Weathering of parent rocks is one of the major mechanisms controlling the concentrations of chemical constituents and salinity in the groundwater (Ling et al 2022). To understand the impact of evaporite salts, silicate rocks, and carbonate rocks on groundwater salinization in the study area, the relationships between SO4 2-+Cl -and HCO3 -, as well as the relationship between SO4 2-+HCO3 -and Ca 2+ +Mg 2+ milliequivalent concentration ratios, were examined (Yu et al 2022).…”

Section: Groundwater Salinization and Chemical Processmentioning

confidence: 99%

Deciphering Hydrochemical Characteristics and Formation mechanism of Groundwater in the Banggou Iron Mine Area, Peru

Ge,

Wang,

Wan

et al. 2023

Preprint

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Understanding the hydrochemical characteristics and formation processes of groundwater in mining areas is crucial for protecting and utilizing underground water resources. This study analyzed 42 groundwater samples from the Banggou mining area in Peru to determine the spatial-temporal distribution patterns and formation processes of chemical components. Statistical analysis, Gibbs diagrams, ion ratios, and hydrogeochemical modeling techniques were used. The results show that the groundwater in the study area is weakly alkaline (pH = 7.72) and has a total dissolved solids (TDS) range of 253.19 to 17912.82 mg/L, with an average of 2788.31 mg/L. About 55% of the groundwater samples are classified as brackish or saline water. The chemical composition of groundwater is mainly controlled by evaporation, rock weathering, human activities, oxidation of pyrite, and desulfurization reactions. The dissolution of evaporite minerals such as halite and gypsum contributes to the presence of Na+, Cl−, and SO42−, while Ca2+ and Mg2+ mainly come from the dissolution of minerals like calcite, gypsum, dolomite, and silicate. The presence of NO3− is attributed to anthropogenic influences. The hydrogeochemical modeling indicates a strong dissolution tendency for halite and propensity for dissolution for gypsum, calcite, and dolomite. Additionally, pyrite oxidation and cation exchange processes occur from recharge to discharge zones.

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Isotope implications of groundwater recharge, residence time and hydrogeochemical evolution of the Longdong Loess Basin, Northwest China

Cited by 9 publications

References 41 publications

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

Groundwater recharge in typical geomorphic landscapes and different land use types on the loess plateau, China

Deciphering Hydrochemical Characteristics and Formation mechanism of Groundwater in the Banggou Iron Mine Area, Peru

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