A thorough understanding of the source and infiltration mechanism of soil water is of great significance to the stable supply of regional water resources and the protection of ecological environment.To solve this cruc...A thorough understanding of the source and infiltration mechanism of soil water is of great significance to the stable supply of regional water resources and the protection of ecological environment.To solve this crucial scientific problem,a total of 1980 samples of various water bodies in Qilian Mountains were collected in early,heavy and end ablation period in 2012-2019 to determine the source of soil water with endmember mixing analysis.Double isotope mass balance was used to calculate the relative contribution of piston flow and preferred flow to groundwater.The results of the study show that precipitation dominated the soil water in the study region,and it contributes 78%,89%and 91%of soil water in early,heavy and end ablation periods,respectively.Ground ice meltwater is also an important source of soil water,its contribution was 16%,11%and 7%in early,heavy and end ablation period,respectively.Snowmelt contributed to soil water only during the early(6%)and late(2%)ablation periods.Groundwater is replenished through the combined effects of preferential flow and piston flow.According to double isotope mass balance,the contribution of priority flow to shallow groundwater is 34%,45%and 34%,respectively in early,heavy and end ablation periods.This study identified the sources of soil water and water transport mechanisms in the Qilian Mountains,providing scientific and technological support for water resource conservation and sustainable utilization in cold regions.展开更多
【目的】为系统综述饮用水中氯消毒副产物(DBPs)的研究现状、挑战与未来方向,全面评估其对公共健康的潜在风险,为水处理工艺优化和安全标准制定提供科学参考。【方法】采用文献计量学与系统综述法,基于Web of Science核心数据库分析该...【目的】为系统综述饮用水中氯消毒副产物(DBPs)的研究现状、挑战与未来方向,全面评估其对公共健康的潜在风险,为水处理工艺优化和安全标准制定提供科学参考。【方法】采用文献计量学与系统综述法,基于Web of Science核心数据库分析该领域的研究态势与热点,并系统归纳评述了DBPs的前体来源、生成机制、种类特征、健康风险、检测技术及各类处理方法的研究进展。【结果】计量分析表明,DBPs研究热度持续攀升,中美为主要研究力量,聚焦为三卤甲烷(THMs)和卤乙酸(HAAs)。天然有机物(NOMs)是生成含碳DBPs的主要前体,而含氮有机物则生成毒性更高的氮杂DBPs。高级氧化(AOPs)和臭氧氧化能有效去除前体,但存在成本高与二次污染风险。质谱联用是主流检测技术,但在识别新型、低浓度DBPs方面仍具挑战。总有机碳(TOC)与紫外吸光度(UV_(254))可作前体替代监测指标,机器学习模型在预测DBPs生成方面潜力巨大。【结论】当前,DBPs的控制在新型物种识别、全过程风险评估与高效低成本处理技术方面仍存挑战。未来研究应聚焦于发展高通量、高精度的检测新技术,评估新型DBPs的毒性,开发经济环保的组合处理工艺,并加强从源头到龙头的全过程风险管控策略,以保障饮用水安全。展开更多
基金supported by The National Science Foundation For Distinguished Young Scholars(42425107)Self-financed science and technology projects of Qinghai 906 Engineering Survey and Design Institute Co.Ltd(2024-KJ-04)+2 种基金Gansu Province Young Talent Program(2025QNGR53)Gansu Science and Technology Program(25JRRA537)the Top Talent Project of Gansu province,Chinese Academy of Sciences Young Crossover Team Project(JCTD-2022-18).
文摘A thorough understanding of the source and infiltration mechanism of soil water is of great significance to the stable supply of regional water resources and the protection of ecological environment.To solve this crucial scientific problem,a total of 1980 samples of various water bodies in Qilian Mountains were collected in early,heavy and end ablation period in 2012-2019 to determine the source of soil water with endmember mixing analysis.Double isotope mass balance was used to calculate the relative contribution of piston flow and preferred flow to groundwater.The results of the study show that precipitation dominated the soil water in the study region,and it contributes 78%,89%and 91%of soil water in early,heavy and end ablation periods,respectively.Ground ice meltwater is also an important source of soil water,its contribution was 16%,11%and 7%in early,heavy and end ablation period,respectively.Snowmelt contributed to soil water only during the early(6%)and late(2%)ablation periods.Groundwater is replenished through the combined effects of preferential flow and piston flow.According to double isotope mass balance,the contribution of priority flow to shallow groundwater is 34%,45%and 34%,respectively in early,heavy and end ablation periods.This study identified the sources of soil water and water transport mechanisms in the Qilian Mountains,providing scientific and technological support for water resource conservation and sustainable utilization in cold regions.
文摘【目的】为系统综述饮用水中氯消毒副产物(DBPs)的研究现状、挑战与未来方向,全面评估其对公共健康的潜在风险,为水处理工艺优化和安全标准制定提供科学参考。【方法】采用文献计量学与系统综述法,基于Web of Science核心数据库分析该领域的研究态势与热点,并系统归纳评述了DBPs的前体来源、生成机制、种类特征、健康风险、检测技术及各类处理方法的研究进展。【结果】计量分析表明,DBPs研究热度持续攀升,中美为主要研究力量,聚焦为三卤甲烷(THMs)和卤乙酸(HAAs)。天然有机物(NOMs)是生成含碳DBPs的主要前体,而含氮有机物则生成毒性更高的氮杂DBPs。高级氧化(AOPs)和臭氧氧化能有效去除前体,但存在成本高与二次污染风险。质谱联用是主流检测技术,但在识别新型、低浓度DBPs方面仍具挑战。总有机碳(TOC)与紫外吸光度(UV_(254))可作前体替代监测指标,机器学习模型在预测DBPs生成方面潜力巨大。【结论】当前,DBPs的控制在新型物种识别、全过程风险评估与高效低成本处理技术方面仍存挑战。未来研究应聚焦于发展高通量、高精度的检测新技术,评估新型DBPs的毒性,开发经济环保的组合处理工艺,并加强从源头到龙头的全过程风险管控策略,以保障饮用水安全。
