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Impact of the Three Gorges Dam on Regulation and Storage Capacity of Poyang Lake

Journal of Landscape Research 2020年第6期12卷 50-55页

作者： chen mofei FAN Shaoying DENG Jinyun WANG Xiaopeng Changjiang Institute of Survey PlanningDesign and ResearchWuhanHubei 430010China Yellow River Hydropower Development Corporation JiyuanHenan 459017China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhanHubei 430072China Yellow River Engineering Consulting Co. Ltd.ZhengzhouHenan 450003China

The regulation and storage capacity of Poyang Lake is infl uenced by the fl ow from the main stream of the Yangtze River and the fi ve rivers in the Poyang Lake *** the operation of the Three Gorges Dam(TGD),hydrological changes in the main stream of the Yangtze River impact water exchange between the Yangtze River and Poyang *** on the analysis of measured data and factors infl uencing outfl ow at Hukou station,a new empirical formula describing outfl ow at Hukou station and critical water level for lake storage capacity is *** change in monthly storage capacity of Poyang Lake before and after the construction of the TGD is analyzed *** results show that the fl ows from the main stream of the Yangtze River and the fi ve rivers in the Poyang Lake basin affect outfl ow and water storage capacity by changing the water level difference between Xingzi and Hukou stations and by changing the water level at Hukou *** the Yangtze River and the fi ve rivers in the Poyang Lake basin differ in process and *** the water level at Hukou station remains consistent,when the fl ow from the fi ver rivers increases by 1,000 m3/s,the outfl ow at Hukou station increases by 304 m3/*** the fl ow from the main stream of the Yangtze River increases by 1,000 m3/s,the outfl ow at Hukou station decreases by 724 m3/*** addition,the operation of the TGD affects the water storage capacity of Poyang *** water volume of Poyang Lake decreases by 49.4%in September,but increases by 47.7%in May.

关键词： Stage–discharge relation Regulation and storage capacity of Poyang Lake Water exchange Three Gorges Dam

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变化环境下七里山水域高洪水位研究

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水利学报 2018年第4期49卷 456-463页

作者：周柏林栾震宇刘晓群陈莫非金秋湖南省水利厅湖南长沙410007 南京水利科学研究院江苏南京210029 湖南省洞庭湖水利工程管理局湖南长沙410007 武汉大学湖北武汉430000

七里山水域是洞庭湖汇入长江的江湖交汇区,受三峡工程及上游溪洛渡、向家坝水库运用清水下泄影响,江湖水沙输运、河道冲淤及河势演变、河段蓄泄关系、洪水位和泄流能力等出现诸多新变化,对长江中游特别是洞庭湖区的防洪蓄洪格局产生影... 详细信息

七里山水域是洞庭湖汇入长江的江湖交汇区,受三峡工程及上游溪洛渡、向家坝水库运用清水下泄影响,江湖水沙输运、河道冲淤及河势演变、河段蓄泄关系、洪水位和泄流能力等出现诸多新变化,对长江中游特别是洞庭湖区的防洪蓄洪格局产生影响。在长江中下游水沙整体宏观数学模型的基础上建立了七里山水域二维水沙局部细致模拟数值模型,模拟研究了水库群运用后,在不同控制水位、不同蓄滞洪区启用条件下,针对各种典型洪水的防洪蓄洪问题。对于1998年型洪水,通过三峡等上游水库调节并抬高七里山控制水位0.5 m时,可不分蓄洪;对于1954年目标洪水,则需利用洞庭湖区24蓄洪垸和洪湖对等承担分蓄洪任务。

关键词：变化环境洞庭湖区洪水模拟防洪蓄洪

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三峡水库蓄水前后荆江河段冲淤与水沙过程响应

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人民长江 2020年第10期51卷 1-6页

作者：樊咏阳胡春燕陈莫非长江勘测规划设计研究有限责任公司湖北武汉430014

三峡水库蓄水以来,出库沙量(以宜昌水文站实测数据为依据)大幅度降低,坝下游河床冲淤规律也随之发生改变。实测资料表明:荆江河段发生全面冲刷,而沿程冲刷又进一步引起了下游悬沙输移量的变化。基于1992~2017年长江中下游荆江河段各水... 详细信息

三峡水库蓄水以来,出库沙量(以宜昌水文站实测数据为依据)大幅度降低,坝下游河床冲淤规律也随之发生改变。实测资料表明:荆江河段发生全面冲刷,而沿程冲刷又进一步引起了下游悬沙输移量的变化。基于1992~2017年长江中下游荆江河段各水文站实测流量、含沙量数据,对该河段水沙关系进行了较为系统的分析,初步得出三峡水库蓄水前、蓄水初期以及试验性蓄水后不同时期的水沙关系变化。基于实测资料,利用输沙量法计算荆江不同河段的冲淤量随流量的变化,提出了不同时期荆江河段冲刷强度最大的流量级。

关键词：水沙过程河床冲淤河流动力学输沙量法荆江河段三峡水库长江

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2020年洪水洞庭湖调蓄作用分析

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水利水电快报 2021年第1期42卷 33-38页

作者：陈莫非李安强马强长江勘测规划设计研究有限责任公司湖北武汉430010

洞庭湖作为长江流域重要调蓄湖泊,在有效削减长江干流洪峰流量的同时,可调蓄洞庭湖"四水"入湖的洪水,大大减轻中下游地区防洪压力。基于洞庭湖历史演变情况、江湖水沙交换规律,分析了洞庭湖在长江中下游防洪体系中的重要地位及在2020年... 详细信息

洞庭湖作为长江流域重要调蓄湖泊,在有效削减长江干流洪峰流量的同时,可调蓄洞庭湖"四水"入湖的洪水,大大减轻中下游地区防洪压力。基于洞庭湖历史演变情况、江湖水沙交换规律,分析了洞庭湖在长江中下游防洪体系中的重要地位及在2020年的调蓄作用,并探究未来洞庭湖防洪运用策略。研究结果表明:2020年汛期洞庭湖城陵矶水位持续超警戒水位60 d,其中18 d洞庭湖调蓄量为正值,共调蓄洪水62.35亿m^3。鉴于洞庭湖在长江中下游防洪体系中的重要地位,建议尽快开展洞庭湖四口水系综合整治工程,提高洞庭湖调蓄能力,减轻长江中下游地区的防洪压力。

关键词：湖泊调蓄调蓄量 2020年洪水江湖关系洞庭湖长江

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Halogen composition and heterogeneity in the continental lithospheric mantle

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Science China Earth Sciences 2025年第1期68卷 310-314页

作者： Chunfei chen State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences

1. Introduction Halogens, including fluorine(F), chlorine(Cl), bromine(Br), and iodine(I), are highly mobile and water-soluble elements that can become significantly enriched in melts and fluids. In fluids and melts, halogens react with nearly all metals and readily form complexes with metal cations, significantly influencing the distribution of metal elements between different phases. Therefore, halogens play a crucial role in the migration, enrichment, and mineralization of key metals in the lithosphere(Weis et al., 2012; Liu et al., 2024).

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Cyano migration-mediated radical-polar crossover cyclopropanation

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Science China Chemistry 2025年第1期68卷 241-248页

作者： Ziqiang Wang Yasu chen Jie Li chen Zhu Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials ScienceSoochow University Frontiers Science Center for Transformative Molecules Zhangjiang Institute for Advanced Study and Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Shanghai Jiao Tong University

We report a novel cyano migration-mediated radical-polar crossover process, whereby both the sulfonylcyanation of aliphatic alkenes and the formation of cyclopropanes are concurrently achieved. This transformation yields a diverse array of multisubstituted cyclopropanes under mild photocatalytic conditions. Mechanistic studies elucidate that the reaction proceeds via intramolecular nucleophilic substitution, leading to the formation of the cyclopropane derivatives.

关键词： cyclopropanation cyano migration radical-polar crossover radical reactions

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Two paths, one goal: mechanism of calcium homeostasis to balance plant growth and immunity

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Science China Life Sciences 2025年第1期68卷 306-308页

作者： Aziz Ul Ikram Yanping Jing Huan chen Jian chen International Genome Center Jiangsu University Joint Center for Single Cell Biology School of Agriculture and BiologyShanghai Jiao Tong University

Calcium(Ca2+) is an essential nutrient and a cellular signal in plants. The level of free Ca2+in the apoplast is ～10,000-fold higher than that in the cytoplasm at the resting state. This large Ca2+level gradient across the membrane between the interior and exterior can cause Ca2+overload and toxicity. Plants have evolved mechanisms to export Ca2+out of the cytoplasm or store it in intracellular organelles, such as endoplasmic reticulum（ER）, mitochondria, and vacuole.

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Efficient photocatalytic reduction of CO2 to formate by a molecular noble metal-free system

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Science China Chemistry 2025年第1期68卷 152-156页

作者： Lihua Zhang Lingjing chen Huatian Shi Yue Wei Gui chen Tai-Chu Lau School of Environment and Civil Engineering Research Center for Eco-environmental Engineering Dongguan University of Technology Department of Chemistry and Institute of Molecular Functional Materials City University of Hong Kong

Reducing CO2to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting CO2to a specific product beyond CO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce CO2to formate （HCOO-）.Turnover number （TON） for HCOO-up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole （BIH） as sacrificial reductant in a CO2-saturated NMP/TEA （v/v,3:1） solution under visible light *** potential electrolysis at-1.41 V （***/Ag Cl） in the presence of 12 m M Et3NHBF4also produced HCOO-with Faradaic efficiency of 39%.Spectroscopic and electrochemical studies suggest that a[CoI-H]species is the key intermediate for CO2reduction.

关键词： photocatalysis noble metal-free CO2 reduction formate cobalt hydride

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Toward understanding the role of genomic repeat elements in neurodegenerative diseases

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Neural Regeneration Research 2025年第3期20卷 646-659页

作者： Zhengyu An Aidi Jiang Jingqi chen Institute of Science and Technology for Brain-Inspired Intelligence Fudan UniversityShanghaiChina MOE Frontiers Center for Brain Science Fudan UniversityShanghaiChina MOE Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence Fudan UniversityShanghaiChina Zhangjiang Fudan International Innovation Center ShanghaiChina

Neurodegenerative diseases cause great medical and economic burdens for both patients and society;however, the complex molecular mechanisms thereof are not yet well understood. With the development of high-coverage sequencing technology, researchers have started to notice that genomic repeat regions, previously neglected in search of disease culprits, are active contributors to multiple neurodegenerative diseases. In this review, we describe the association between repeat element variants and multiple degenerative diseases through genome-wide association studies and targeted sequencing. We discuss the identification of disease-relevant repeat element variants, further powered by the advancement of long-read sequencing technologies and their related tools, and summarize recent findings in the molecular mechanisms of repeat element variants in brain degeneration, such as those causing transcriptional silencing or RNA-mediated gain of toxic function. Furthermore, we describe how in silico predictions using innovative computational models, such as deep learning language models, could enhance and accelerate our understanding of the functional impact of repeat element variants. Finally, we discuss future directions to advance current findings for a better understanding of neurodegenerative diseases and the clinical applications of genomic repeat elements.

关键词： Alzheimer's disease ataxia deep learning long-read sequencing neurodegeneration neurodegenerative diseases Parkinson's disease repeat element structural variant

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Fabrication and Mechano-sensing Characteristics of Bending Polypyrrole Actuator

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 240-245页

作者： chen Jinyou HU Wei School of Automotive Engineering Hunan Financial&Industrial Vocational-technical CollegeHengyang 421002China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China

To prepare a conductive polymer actuator with decent performance,a self-built experimental platform for the preparation of polypyrrole film is *** of the essential goals is to examine the mechanical characteristics of the actuator in the presence of various combinations of process parameters,combined with the orthogonal test method of"four factors and three levels".The bending and sensing characteristics of actuators of various sizes are methodically examined using a self-made bending polypyrrole *** functional relationship between the bending displacement and the output voltage signal is established by studying the characteristics of the actuator sensor subjected to various degrees of *** experimental results reveal that the bending displacement of the actuator tip almost exhibits a linear variation as a function of length and *** the voltage reaches 0.8 V,the bending speed of the actuator tends to be ***,the mechanical properties of the self-assembled polypyrrole actuator are verified by the design and fabrication of the microgripper.

关键词： conductive polymer polypyrrole mechanical characteristics actuators sensing characteristics

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