Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： Arsenic (As) and fluoride (F) pollution in water bodies, along with their coexistence, are criticalenvironmental concerns, with long-term exposure posing a significant threat to public health. This study focuseson the Manas River Basin as the research area, analyzing the hydrochemical, and spatial distributioncharacteristics of groundwater with high As and F content. Furthermore, the study aims to elucidate thehydrogeochemical processes related to the origin, migration, and enrichment of As, and F in groundwater,considering geological conditions, occurrence environments, and the influence of human activities. The resultsshow that the groundwater in the study area exhibits an alkaline-reducing environment. The mass concentrationsof As and F in groundwater range from 1.13 to 41.35 μg ·L − 1 and from 0.06 to 8.02 mg ·L − 1, respectively.Groundwater samples with high As and F content constituted 62.9% and 45.7% of the total samples, respectively,while samples with a coenrichment of As and F accounted for 37.1% of the total samples. As- F coenrichedgroundwater is mainly distributed in the northern plain region, near the edge of the desert, with the dominanthydrochemical types being HCO3 ·Cl and HCO3 ·SO4 ·Cl. The primary sources of As and F in groundwater arehigh-content rock strata found in the southern mountainous area of the Manas River Basin. The high pH value,low SO2−4 /Cl− molar ratio, and low Eh of the high-As-content groundwater in the Manas River Basin indicate thata weak alkaline- reducing environment facilitates As enrichment in groundwater. Conversely, groundwater withhigh F content is characterized by high pH, HCO−3 , and Na+ levels, as well as low Ca2+, indicating that an alkalineenvironment with high Na+ and low Ca2+ content favors F enrichment in groundwater.
Subjects: Geosciences >> Geography submitted time 2023-12-16 Cooperative journals: 《干旱区研究》
Abstract： The Bortala River Basin in Xinjiang is short of water resources and is unevenly distributed in time and space. It is important to quantitatively calculate the conversion rates of the surface water and groundwater in different reaches of the basin and as well as at different periods for the purposes of groundwater exploitation and replenishment and for the optimal allocation of water resources. Based on the daily flow measurement data from five monitored sections in the middle reaches of Bortala River from December 1, 2021, to November 30, 2022, Using river runoff analysis method, combined with the P-III distribution frequency curve, comparisons of water quantity between different monitoring sections, and hydrogeological cross-sections. The relationship between the infiltration rate and the runoff in the leaking river section was also fitted. The results showed that: (1) among the five monitoring stations, Bole Hydrology Station had the largest annual runoff, while Chaxiang Bridge had the smallest; (2) the runoff in the middle reaches of Bortala River was in a normal flow year year of 2022. (3) in the upper part of the middle reaches of the Bortala River, groundwater is converted to recharge surface water; The surface water in the section that runs from the Kundelun canal head to Chaxiang Bridge has a large amount of infiltration to recharge groundwater (infiltration coefficient: 0.67), and the infiltration rate was found to be significantly negatively correlated with the quantity of incoming water; In the lower part, groundwater spilled over the surface. The middle reaches of the Bortala River experienced three conversions of surface water and groundwater, with an overall performance of groundwater overflow supplementing surface water.
Subjects: Geosciences >> Geography submitted time 2022-03-28 Cooperative journals: 《干旱区研究》
Abstract：为研究吐鲁番盆地平原区地下水水化学特征及水质状况，根据吐鲁番地区2015年（最近1次）全面的地下水污染调查数据，选取44组地下水水质检测数据（潜水33组，承压水11组），运用数理统计、Piper三线图、Gibbs图、离子比值法对研究区地下水水化学特征及成因进行分析，运用内梅罗指数法、改进内梅罗指数法和模糊综合评价法对研究区地下水质量进行评价。结果表明：（1）吐鲁番盆地平原区地下水主要为低矿化度的弱碱性水，水化学类型以SO4Cl-NaCa型和HCO3SO4-NaCa型为主，其次为HCO3SO4Cl-NaCa型；研究区水化学成分主要受蒸发浓缩和岩石风化共同作用的影响。（2）地下水中的Ca2+、Mg2+主要来自蒸发岩的溶解，Na+、K+、Cl-主要来自岩盐的溶解，少量潜水中的Na+和K+来自硅酸盐的溶解。（3）(Na+-Cl-)/［(Ca2++Mg2+)-(SO42-+HCO3-)=-1，呈显著负相关，说明地下水化学组分的形成受到了阳离子交换作用的影响。（4）水质评价结果显示：3种评价方法中的Ⅲ类及以上水质占比均高于55%，地下水质量整体较好；模糊综合评价法的Ⅳ、Ⅴ类水占比最低为27.3%，Ⅳ、Ⅴ类水主要分布在托克逊县的博斯坦乡和鄯善县以东的火车站镇和七克台镇。
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