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Characteristics of Climate Change in Northern Xinjiang in 1961–2017, China

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Chinese Geographical Science 2020年第2期30卷 249-265页

作者： HE Binbin SHENG Yu CAO Wei wu jichun State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Xinjiang is located in the core China’s‘Belt and Road’development,and northern Xinjiang is an important region for economic *** recent years,due to the strong influence of global climate change and human disturbance,regional climate instability and ecological-economic-social system sensitivity have *** this paper,seasonal,interannual,interdecadal,spatial,abrupt,and periodic variations of temperature and precipitation in northern Xinjiang were analyzed using daily surface air temperature and precipitation data from 49 meteorological stations during 1961–*** the same time,the driving factors of climate change are *** included linear regression,cumulative anomaly,the Mann-Kendall test,and Morlet wavelet *** results indicated that during the study period,annual mean temperature and annual precipitation increased significantly at rates of 0.35℃/10 yr and 13.25 mm/10 yr,respectively,with abrupt changes occurring in 1994 and *** mean temperature and annual precipitation in all four seasons showed increasing trends,with the maximum increases in winter of 0.42℃/10 yr and 3.95 mm/10 yr,*** general climate in northern Xinjiang showed a trend towards increasingly warm and *** terms of spatial distribution,the temperature and precipitation in high mountainous areas increased the most,while basins areas increased only *** change analysis showed that annual mean temperature and annual precipitation experienced two climatic shifts from cold to warm and dry to wet,*** change,economic development and land use change are important factors affecting climate change,and more research should be done in this field.

关键词： northern Xinjiang climate change driving factors temperature precipitation

A Hybrid Multi-Objective Evolutionary Algorithm for Optimal Groundwater Management under Variable Density Conditions

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Acta Geologica Sinica(English Edition) 2012年第1期86卷 246-255页

作者： YANG Yun wu Jianfeng SUN Xiaomin LIN Jin wu jichun Department of Hydrosciences School of Earth Sciences and EngineeringNanjing UniversityNanjingJiangsu 210093China Nanfing Hydraulic Research Institute NanjingJiangsu 210029China

In this paper, a new hybrid multi-objective evolutionary algorithm （MOEA）, the niched Pareto tabu search combined with a genetic algorithm （NPTSGA）, is proposed for the management of groundwater resources under variable density conditions. Relatively few MOEAs can possess global search ability contenting with intensified search in a local area. Moreover, the overall searching ability of tabu search （TS） based MOEAs is very sensitive to the neighborhood step size. The NPTSGA is developed on the thought of integrating the genetic algorithm （GA） with a TS based MOEA, the niched Pareto tabu search （NPTS）, which helps to alleviate both of the above difficulties. Here, the global search ability of the NPTS is improved by the diversification of candidate solutions arising from the evolving genetic algorithm population. Furthermore, the proposed methodology coupled with a density-dependent groundwater flow and solute transport simulator, SEAWAT, is developed and its performance is evaluated through a synthetic seawater intrusion management problem. Optimization results indicate that the NPTSGA offers a tradeoff between the two conflicting objectives. A key conclusion of this study is that the NPTSGA keeps the balance between the intensification of nondomination and the diversification of near Pareto-optimal solutions along the tradeoff curves and is a stable and robust method for implementing the multi-objective design of variable-density groundwater resources.

关键词： seawater intrusion multi-objective optimization niched Pareto tabu search combined with genetic algorithm niched Pareto tabu search genetic algorithm

A new method for fitting the complicated water level process of the lower Yellow River

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Science China(Technological Sciences) 2009年第10期52卷 2997-3003页

作者： YongSheng Yuan jichun wu YiJun Zuo JieRen Chen College of Sciences Hohai University Nanjing 210098 China Department of Earth Sciences Nanjing University Nanjing 210093 China Department of Statistics and Probability Michigan State University East Lansing MI 48824 USA College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

With the view of effectively fitting the complicated water level process of the lower Yellow River, polynomial regression, stepwise regression, parameters by ridge estimate and so on, are logically integrated. And the progressive transformation is introduced. Then a new method is put forward. The core difference of this new method from the same kind of methods lies in that in this method the strong coupling effect of weak influencing factors which is common in a complicated water level process is considered, that many effective methods are synthetically used to reduce the fitting model error, and that the necessary progressive transformation is introduced. The advantages of many theories and methods are logically integrated in this method, and the method can be easily used. The rationality and necessity of each step in this method are ensured by sufficient theories, so this method can be widely used to effectively simulate the inherent relations in the same kind of complicated data. Furthermore, many complicated water level processes of the lower Yellow River are fitted by this method, and all the fitting precisions are markedly higher than the precision by the other existing methods. Every component term in the fitting model has clear physical meaning.

关键词： complicated water level process high sediment content nonlinearity stepwise transforming-filtrating fitting method heavy sediment-laden river

Highly Efficient Photothermocatalytic CO_(2) Reduction in Ni/Mg-Doped Al_(2)O_(3) with High Fuel Production Rate, Large Light-to-Fuel Efficiency, and Good Durability

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Energy & Environmental Materials 2022年第2期5卷 582-591页

作者： Xin Tan Shaowen wu Yuanzhi Li Qian Zhang Qianqian Hu jichun wu An Zhang Yongdi Zhang State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

A novel nanocomposite of Ni nanoparticles loaded on Mg-doped Al_(2)O_(3)(Ni/Mg-Al_(2)O_(3))was *** photothermocatalytic CO_(2) reduction with methane(CRM)merely using focused UV-vis-IR illumination on Ni/Mg-Al_(2)O_(3),high production rates of H_(2)(r_(H2),69.71 mmol min^(−1) g^(−1))and CO(rCO,74.57 mmol min^(−1) g^(−1))and an extremely large light-to-fuel efficiency(η,32.9%)are *** rH2 and rCO(51.07 and 59.66 mmol min^(−1) g^(−1))and a largeη(32.5%)are acquired even by using focusedλ>560 nm vis-IR ***/Mg-Al_(2)O_(3) shows good durability for photothermocatalytic CRM due to the side reaction of carbon deposition being enormously inhibited in comparison with a reference catalyst of Ni nanoparticles loaded on Al_(2)O_(3).The enormous carbon deposition inhibition is ascribed to the presence of a fence of CO_(2) molecules(strongly adsorbed on Mg-doped Al_(2)O_(3))around Ni nanoparticles,which block the polymerization and growth of carbon species to nanofibers by promoting the oxidation of carbon species formed by CH_(4) *** high photothermocatalytic activity of Ni/Mg-Al_(2)O_(3) arises from efficient light-driven thermocatalytic CRM.A photoactivation is found to considerably raise the photothermocatalytic activity of Ni/Mg-Al_(2)O_(3) because of the apparent activation energy(Ea)being substantially decreased upon focused *** Ea reduction is associated with the rate-determining steps of CRM(e.g.,CH_(4) dissociation and the oxidation of carbon species)being accelerated upon focused illumination.

关键词： CO_(2)reduction light-to-fuel efficiency Ni/Mg-Al_(2)O_(3)nanocomposite photocatalytic photothermocatalytic

Isolation,Identification,and Characterization of an Aluminum-Tolerant Bacterium Burkholderia ***1 from an Acidic Red Soil

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Pedosphere 2018年第6期28卷 905-912页

作者： HUANG Shoucheng WANG Xiaodong LIU Xu HE Genhe wu jichun School of Life Sciences Key Laboratory of Biology Diversity and Ecological Engineering of Jiangxi ProvinceJinggangshan UniversityJi'an 343009(China) School of Life Sciences Anhui Science and Technology UnzversityFengyang 233100(China) Jiangxi Academy of Forestry Nanchang 330013(China) Department of Hydrosciences State Key Laboratory of Pollution Control and Resources ReuseNanjing UniversityNanjing 210093(China)

Aluminum(Al) toxicity usually occurs in acidic soils worldwide, which is detrimental to the growth of organisms. An Al-tolerant bacterium, SB1, was isolated from an acidic red soil of Chingkang Mountain, located in Jiangxi Province of China. Polyphasic analysis,including a 16 S rDNA phylogenetic tree as well as morphological and physicochemical properties, revealed that the isolate was a gramnegative, rod-shaped bacterium, which was recognized as Burkholderia sp. SB1 and had extreme acidity tolerance(pH 2.2) and excellent Al resistance(270 mg L^(-1) Al^(3+)). It could remove Al by up to 97.7% at a concentration of 54 mg L^(-1) Al^(3+). SB1 behavior under different temperatures and antibiotics was also examined. SB1 preferred moderate temperature conditions, ranging from 25 to37?C, and exhibited notable resistance to multiple antibiotics(including ampicillin, streptomycin, and tetracycline), except for being sensitive to chloramphenicol. Therefore, as the first reported bacterium to possess favorable Al resistance and excellent Al removal,Burkholderia sp. SB1 can potentially be used as an agent for bioremediation of Al-contaminated acidic red soils.

关键词： antibiotics bioremediation Al resistance Al toxicity microbial community plant growth-promoting bacteria temperature

Quantifying the impact of mineralogical heterogeneity on reactive transport modeling of CO_(2)+O_(2) in-situ leaching of uranium

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Acta Geochimica 2022年第1期41卷 50-63页

作者： Yun Yang Wenjie Qiu Zhengbang Liu Jian Song Jianfeng wu Zhi Dou Jinguo Wang jichun wu School of Earth Sciences and Engineering Hohai University8 Focheng West Rd.NanjingChina Key Laboratory of Surficial Geochemistry Department of HydrosciencesSchool of Earth Sciences and EngineeringNanjing UniversityMinistry of Education163 Xianlin Rd.NanjingChina Beijing Research Institute of Chemical Engineering Metallurgy BeijingChina

CO_(2)+O_(2) in-situ leaching(ISL)of sandstonetype uranium ore represents the third generation of solution mining in *** this study,reactive transport modeling of the interaction between hydrodynamic and geochemical reactions is performed to enable better prediction and regulation of the CO_(2)+O_(2) in-situ leaching process of *** reactions between mining solutions and rock,and the kinetic uranium dissolution controlled by O_(2)(aq)and bicarbonate(HCO_(3)-)are considered in the CO_(2)+O_(2) ISL reactive transport model of a typical sandstone-hosted uranium ore deposit in northern *** reactive leaching of uranium is most sensitive to the spatial distribution of the mineralogical properties of the uranium *** geostatistical models are used to represent the uncertainty on the spatial distribution of mineral grades.A Monte Carlo analysis was also performed to simulate the uranium production variability over an entire set of geostatistical *** ISL stochastic simulation performed with the selected geostatistical realizations approximates the uranium production variability *** simulation results of the ISL reactive transport model show that the extent of the uranium plume is highly dependent on mineralogical *** uncertainty analysis suggests the effect of uranium grade heterogeneity was found to be important to improve the accurate capture of the *** study provides guidance for the accurate simulation and dynamic regulation of the CO_(2)+O_(2) leaching process of uranium at the scale of large mining areas.

关键词： In-situ leaching Reactive transport Heterogeneity Stochastic geostatistical model Monte Carlo analysis Uranium grade

Sea water intrusion and salt water intrusion in the coastal area of Laizhou Bay

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Chinese Science Bulletin 1998年第12期43卷 983-992页

作者： Xue Yuqun wu jichun Xie Chunhong Zhang Yongxiang Nanjing Univ Dept Earth Sci Nanjing 210093 Peoples R China Nanjing Univ Dept Math Nanjing 210093 Peoples R China

The characteristics, pattern, hydrodynamic and hydrochemical features, and the movement pattern of the salt water-fresh water interface of the sea water intrusion and the salt water intrusion, which occur in the coastal area of Laizhou Bay in Shandong Province, are analysed. The characteristics of the two kinds of intrusion are compared as well. A three-dimensional sea water intrusion model to describe the sea water intrusion with a transitional zone 1.56.0 km wide in the phreatic aquifer and a solute transport model describing the behavior of cations exchange in the process of sea water intrusion are established.

关键词： sea water intrusion salt water intrusion cation exchange salt water-fresh water interface numerical simulation.

An Estimation of Ground Ice Volumes in Permafrost Layers in North- eastern Qinghai-Tibet Plateau, China

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Chinese Geographical Science 2018年第1期28卷 61-73页

作者： WANG Shengting SHENG Yu LI Jing wu jichun CAO Wei MA Shuai State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environmental and Resources Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China

The ground ice content in permafrost serves as one of the dominant properties of permafrost for the study of global climate change, ecology, hydrology and engineering construction in cold regions. This paper initially attempts to assess the ground ice volume in permafrost layers on the Qinghai-Tibet Plateau by considering landform types, the corresponding lithological composition, and the measured water content in various regions. An approximation demonstrating the existence of many similarities in lithological composition and water content within a unified landform was established during the calculations. Considerable knowledge of the case study area, here called the Source Area of the Yellow(Huanghe) River(SAYR) in the northeastern Qinghai-Tibet Plateau, has been accumulated related to permafrost and fresh water resources during the past 40 years. Considering the permafrost distribution, extent, spatial distribution of landform types, the ground ice volume at the depths of 3.0–10.0 m below the ground surface was estimated based on the data of 101 boreholes from field observations and geological surveys in different types of landforms in the permafrost region of the SAYR. The total ground ice volume in permafrost layers at the depths of 3.0–10.0 m was approximately(51.68 ± 18.81) km^3, and the ground ice volume per unit volume was(0.31 ± 0.11) m^3/m^3. In the horizontal direction, the ground ice content was higher in the landforms of lacustrine-marshland plains and alluvial-lacustrine plains, and the lower ground ice content was distributed in the erosional platforms and alluvial-proluvial plains. In the vertical direction, the volume of ground ice was relatively high in the top layers(especially near the permafrost table) and at the depths of 7.0–8.0 m. This calculation method will be used in the other areas when the necessary information is available, including landform type, borehole data, and measured water content.

关键词： ground ice volume permafrost source area of the Yellow River Qinghai-Tibet Plateau

Assessment of the Greenhouse Gas Footprint and Environmental Impact of CO_(2)and O_(2)in situ Uranium Leaching

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 986-994页

作者： YANG Yun ZUO Jinsong QIU Wenjie wu jichun QUE Weimin ZHOU Genmao LIU Zhengbang wu Jianfeng School of Earth Sciences and Engineering Hohai UniversityNanjing 211100China Key Laboratory of Surficial Geochemistry Ministry of EducationDepartment of HydrosciencesSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Beijing Research Institute of Chemical Engineering and Metallurgy Beijing 101149China Xinjiang Tianshan Uranium Co. Ltd.CNNCYiningXinjiang 835000China

Under the new development philosophy of carbon peaking and carbon neutrality,CO_(2)and O_(2)in situ leaching(ISL)has been identified as a promising technique for uranium mining in China,not only because it solves carbon dioxide utilization and sequestration,but it also alleviates the environmental ***,significant challenges exist in assessment of CO_(2)footprint and water-rock interactions,due to complex geochemical *** this study conducts a three-dimensional,multicomponent reactive transport model(RTM)of a field-scale CO_(2)and O_(2)ISL process at a typical sandstone-hosted uranium deposit in Songliao Basin,*** simulations are performed to provide new insight into quantitative interpretation of the greenhouse gas(CO_(2))footprint and environmental impact(SO_(4)^(2–))of the CO_(2)and O_(2)ISL,considering the potential chemical reaction network for uranium recovery at the field *** results demonstrate that the fate of the CO_(2)could be summarized as injected CO_(2)dissolution,dissolved CO_(2)mineralization and storage of CO_(2)as a gas phase during the CO_(2)and O_(2)ISL ***,compared to acid ISL,CO_(2)and O_(2)ISL has a potentially smaller environmental footprint,with 20%of SO_(4)^(2–)concentration in the *** findings improve our fundamental understanding of carbon utilization in a long-term CO_(2)and O_(2)ISL system and provide important environmental implications when considering complex geochemical processes.

关键词： in situ leaching of uranium reactive transport modeling geochemical process CO_(2)utilization