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Flash flood type identification and simulation based on flash flood behavior indices in China

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Science China Earth Sciences 2021年第7期64卷 1140-1154页

作者： xiaoyan zhai Liang GUO Yongyong ZHANG State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Research Center on Flood and Drought Disaster ReductionChina Institute of Water Resources and Hydropower ResearchBeijing 100038China Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Flash floods present significant heterogeneity over both space and time due to diverse topographic,geomorphologic,and hydro-meteorological conditions of *** identification and simulation of typical flash flood types are of great significance for the mitigation of flash flood disasters at the national *** flood peak indices and dynamic indices were adopted to characterize the behavioral variability of flash *** typical flash flood types and corresponding behavior indices were identified and simulated using statistical analysis(i.e.,principal component analysis,dynamic K-means clustering,and analysis of similarity)and hydrological modelling(i.e.,HEC and XAJ models).There were 177 flash flood events at the hourly scale being selected for case study from eight catchments with various climatic and geographic *** showed that all the flash flood events were clustered into three types(named Types 1,2,and 3).Type 1 was characterized by low peak flow intensity,early flood peak occurrence time,and thin flood process with short *** 2 was characterized by low peak flow intensity,late flood peak occurrence time,and flat flood process with long *** 3 was characterized by high peak flow intensity and late flood peak occurrence *** flood types showed high consistency with their influencing factors(e.g.,catchment forest ratio and drainage area,occurrence time and magnitude of maximum storm intensity,and concentration of a storm event).The simulation performances were basically the same for HEC and XAJ *** for flash flood event simulations,the average relative error varied from 23.25%to 27.98%,from 11.95%to 18.19%,and from 8.30%to18.25%for Types 1,2 and 3,*** average Nash-Sutcliffe efficiency coefficient varied from 0.39 to 0.54,from 0.76 to 0.85,and from 0.86 to 0.91,*** for the six flash flood behavior indices simulations,the average relative rootmean-square error(RMSEr)varie

关键词： Flood similarity Flood behavior Statistical analysis HEC and XAJ models Humid and semi-humid catchments

Runoff variation and its response to climate change in the Three Rivers Source Region

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Journal of Geographical Sciences 2012年第5期22卷 781-794页

作者： ZHANG Yongyong ZHANG Shifeng zhai xiaoyan XlA Jun Key Laboratory of Water Cycle and Related Land Surface Processes CAS Beijing 100101 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China

Runoff at the three time scales （non-flooding season, flooding season and annual period） was simulated and tested from 1958 to 2005 at Tangnaihai （Yellow River Source Region： YeSR）, Zhimenda （Yangtze River Source Region： YaSR） and Changdu （Lancang River Source Region： LcSR） by hydrological modeling, trend detection and comparative analysis. Also, future runoff variations from 2010 to 2039 at the three outlets were analyzed in A1B and B1 scenarios of CSIRO and NCAR climate model and the impact of climate change was tested. The results showed that the annual and non-flooding season runoff decreased significantly in YeSR, which decreased the water discharge to the midstream and down- stream of the Yellow River, and intensified the water shortage in the Yellow River Basin, but the other two regions were not statistically significant in the last 48 years. Compared with the runoff in baseline （1990s）, the runoff in YeSR would decrease in the following 30 years （2010-2039）, especially in the non-flooding season. Thus the water shortage in the mid- stream and downstream of the Yellow River Basin would be serious continuously. The runoff in YaSR would increase, especially in the flooding season, thus the flood control situation would be severe. The runoff in LcSR would also be greater than the current runoff, and the annual and flooding season runoff would not change significantly, while the runoff variation in the non-flooding season is uncertain. It would increase significantly in the B1 scenario of CSIRO model but decrease significantly in B1 scenario of NCAR model. Furlhermore, the most sensitive region to climate change is YaSR, followed by YeSR and LcSR.

关键词： climate change runoff variation SWAT (Soil and Water Assessment Tool) Mann-Ke:~dall test ThreeRivers Source Region

Uncertainty analysis for integrated water system simulations using GLUE with different acceptability thresholds

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Science China(Technological Sciences) 2021年第8期64卷 1791-1804页

作者： ZHANG YongYong XIA Jun SHAO QuanXi LI Lu YEN Haw zhai xiaoyan ZHAO TongTieGang LIN KaiRong Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China CSIRO Data 61 WembleyWestern Australia6913Australia Bjerknes Centre for Climate Research NORCE Norwegian Research CentreBergen5007Norway Blackland Research and Extension Center Texas A&M UniversityTempleTexas76502USA China Institute of Water Resources and Hydropower Research Beijing100038China Department of Water Resources and Environment Sun Yat-sen UniversityGuangzhou510275China

Integrated water quantity and quality simulations have become a popular tool in investigations on global water *** integrated and complex models,conventional uncertainty estimations focus on the uncertainties of individual modules,e.g.,module parameters and structures,and do not consider the uncertainties propagated from interconnected ***,this study investigated all the uncertainties of integrated water system simulations using the GLUE(i.e.,generalized likelihood uncertainty estimation)method,including uncertainties associated with individual modules,propagated uncertainties associated with interconnected modules,and their *** changes in both acceptability thresholds of GLUE and the uncertainty estimation results were also investigated for different fixed percentages of total number of iterations(100000).Water quantity and quality variables(i.e.,runoff and ammonium nitrogen)were selected for the case *** results showed that module uncertainty did not affect the runoff simulation performance,but remarkably weakened the water quality responses as the fixed percentage increased during calibration and validation *** propagated uncertainty from hydrological modules could not be ignored for water quality simulations,particularly during *** combination of module and propagated uncertainties further weakened the water quality simulation *** uncertainty intervals became wider owing to an increase in the fixed percentages and introduction of more uncertainty ***,the acceptability threshold had a negative nonlinear relationship with the fixed *** fixed percentages(20.0%-30.0%)were proposed as the acceptability thresholds owing to the satisfactory simulation performance and noticeably reduced uncertainty intervals they *** study provided methodological foundations for estimating multiple uncertainty sources of integrated water system models.

关键词： module uncertainty propagated uncertainty uncertainty combination integrated water system simulations GLUE

基于Web of Science近十年干细胞治疗心肌梗死的可视化分析

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中国组织工程研究 2024年第7期28卷 1143-1148页

作者：孙宇康宋丽娟温春丽丁智斌田昊马东马存根翟晓艳山西中医药大学基础医学院/国家中医药管理局多发性硬化益气活血重点研究室山西省晋中市030619 国药同煤集团总医院神经外科山西省大同市037003 山西医科大学第五临床医学院(山西省人民医院)中医科山西省太原市030012 山西医科大学第三医院(山西白求恩医院山西医学科学院同济山西医院)神经内科山西省太原市030032 山西省高等创新研究院山西省太原市030032 山西医科大学山西省太原市030001

背景:心肌梗死的致死率居高不下,是因为包括药物和手术在内的传统治疗方法无法从根本上修复受损的心肌组织,干细胞由于其自我更新和多向分化潜能为解决这一难题提供了可能。目的:运用文献计量学分析归纳干细胞治疗心肌梗死领域近十年的... 详细信息

背景:心肌梗死的致死率居高不下,是因为包括药物和手术在内的传统治疗方法无法从根本上修复受损的心肌组织,干细胞由于其自我更新和多向分化潜能为解决这一难题提供了可能。目的:运用文献计量学分析归纳干细胞治疗心肌梗死领域近十年的研究进展。方法:检索Web of Science数据库中2012-01-01/2022-12-01发表在SCI-E和SSCI中干细胞和心肌梗死的相关文献,利用EXCEL、CiteSpace和VOSviewer软件对发文量、作者、机构、期刊、国家、关键词等数据进行统计及可视化分析。结果与结论:核心文献共计3210篇,年发文总量逐年上升;hausenloy,derek j.是发文量最多的作者,中国是发文量最多的国家,第四军医大学是发文量最多的机构,该领域的研究热点正在从细胞实验和动物实验向临床试验方向转变。近十年来,该领域的研究热度较高,仍有较大的发展前景,应促进国际上、机构间的交流学习,进一步挖掘干细胞在心肌梗死治疗领域的作用。

关键词：干细胞心肌梗死文献计量学知识图谱可视化分析 CiteSpace VOSviewer

Ecological health analysis of wetlands in the middle reaches of Yangtze River under changing environment

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International Journal of Digital Earth 2023年第1期16卷 3125-3144页

作者： Shengqing Zhang xiaoyan zhai Peng Yang Jun Xia Sheng Hu Libo Zhou Cai Fu Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Research Center on Flood and Drought Disaster ReductionChina Institute of Water Resources and Hydropower ResearchBeijingPeople’s Republic of China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhanPeople’s Republic of China Yangtze Valley Water Environment Monitoring Center WuhanPeople’s Republic of China Wuhan CGeo Clouds Science&Tech Co.Ltd WuhanPeople’s Republic of China

Changes in wetland ecosystems have a critical impact on the local ecology and species *** development scenarios and policies are key factors influencing their ***,we studied changes of wetlands in the middle Yangtze River basin(MYRB)in 2001-2020,and a patch-generated land use simulation(PLUS)model and random forest(RF)method were applied to predict and analyze the changes under different scenarios in the MYRB in the future(i.e.2035-2095).The results indicated that:(1)The regions with high wetland proportions were concentrated in the central and eastern MYRB in 2001-2020,with a 1.5%decrease in overall wetland area;(2)The RF could simulate the future ecological quality with training and testing accuracies of 0.98 and 0.92,respectively;(3)Remote Sensing Ecological Index(RSEI)less than 0.5 in the central and eastern regions and 13.3%reduction in the northwest in the SSP245 *** general,the study provides a basis for future regional studies of ecosystem quality and provides data to support wetland conservation and management.

关键词： Remote sensing machine learning ecological prediction ecological change Yangtze River basin

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山洪灾害雨量预警指标分析方法评述与展望

中国防汛抗旱 2024年第5期34卷 1-7页

作者：孙东亚翟晓燕郭一君田壮显中国水利水电科学研究院北京100038 水利部防洪抗旱减灾工程技术研究中心北京100038

山洪灾害预警指标是山洪灾害预报预警的核心,我国现阶段主要采用经验法和水位流量反推法确定雨量预警指标,并逐步推广应用复合预警指标法和动态临界雨量法。在系统阐述国内外常用雨量预警指标分析方法及其特点基础上,针对山洪灾害预警... 详细信息

山洪灾害预警指标是山洪灾害预报预警的核心,我国现阶段主要采用经验法和水位流量反推法确定雨量预警指标,并逐步推广应用复合预警指标法和动态临界雨量法。在系统阐述国内外常用雨量预警指标分析方法及其特点基础上,针对山洪灾害预警指标分析中需考虑的降雨时空分布变化、高含砂水流、泥石流及其他不确定因素影响问题,提出今后雨量预警指标研究方向。

关键词：山洪灾害预警指标水位流量反推法动态临界雨量法不确定因素

健康服务与管理专业基础医学概论课程的教学体会

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中国中医药现代远程教育 2024年第5期22卷 193-195页

作者：翟晓艳杨李旺杨蓉赵焕新季新燕储开博山西中医药大学基础医学院山西晋中030619

健康服务与管理是一个新型专业,其培养模式和教学大纲等均处于探索阶段;其基础医学概论的教学也处于探索阶段。教学过程中有课时少、内容多、跨度大;教师在教学中交流少,知识衔接不紧密;专业针对性不强、培养目标不明确;教学评价体系单... 详细信息

健康服务与管理是一个新型专业,其培养模式和教学大纲等均处于探索阶段;其基础医学概论的教学也处于探索阶段。教学过程中有课时少、内容多、跨度大;教师在教学中交流少,知识衔接不紧密;专业针对性不强、培养目标不明确;教学评价体系单一等一系列问题。针对不同的问题,通过培训专业教师,修订教学大纲、优化知识结构,丰富教学方式和构建评价体系等措施可改善教学效果,提升学习成绩,但是也受到了很多现实条件的限制。

关键词：健康服务与管理专业基础医学概论教学方法评价体系

The“depict”strategy for discovering new compounds in complex matrices:Lycibarbarspermidines as a case

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Journal of Pharmaceutical Analysis 2024年第3期14卷 416-426页

作者： Chen Han Zhixin Zhang Zhiyang Feng Chuanjia zhai Xuejiao Li Yulian Shi Xiang Li Miao Li Ying Wang Gan Luo xiaoyan Gao Department of Chinese Medicine Analysis School of Chinese Materia MedicaBeijing University of Chinese MedicineBeijing102488China

The comprehensive detection and identification of active ingredients in complex matrices is a crucial *** chromatography coupled with high-resolution mass spectrometry(LC-HRMS)is the most prominent analytical platform for the exploration of novel active compounds from complex ***,the LC-HRMS-based analysis workflow suffers from several bottleneck issues,such as trace content of target compounds,limited acquisition for fragment information,and uncertainty in interpreting relevant MS2 *** are vital antioxidant active ingredients in Lycii Fructus,while the reported structures are merely focused on dicaffeoylspermidines due to their low *** comprehensively detect the new structures of lycibarbarspermidine derivatives,a“depict”strategy was developed in this ***,potential new lycibarbarspermidine derivatives were designed according to the biosynthetic pathway,and a comprehensive database was established,which enlarged the coverage of lycibarbarspermidine ***,the polarity-oriented sample preparation of potential new compounds increased the concentration of the target ***,the construction of the molecular network based on the fragmentation pathway of lycibarbarspermidine derivatives broadened the comprehensiveness of ***,the weak response signals were captured by data-dependent scanning(DDA)followed by parallel reaction monitoring(PRM),and the efficiency of acquiring MS2 fragment ions of target compounds was significantly *** on the integrated strategy above,210 lycibarbarspermidine derivatives were detected and identified from Lycii Fructus,and in particular,170 potential new compounds were structurally *** integrated strategy improved the sensitivity of detection and the coverage of low-response components,and it is expected to be a promising pipeline for discovering new compounds.

关键词： Mass spectrometric detection Weak response signals Complex matrices Novel lycibarbarspermidines

干细胞移植对缺血性脑卒中的保护作用及机制研究进展

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解剖学杂志 2024年第4期47卷 343-347页

作者：孙宇康段彦哲贾炜豪杨蓉董春波马存根翟晓艳张瑞平山西中医药大学基础医学院/国家中医药管理局多发性硬化益气活血重点实验室晋中030600 山西省人民医院放射科/山西医科大学第五医院太原030001 山西省高等创新研究院博士后科研工作站太原030032 山西医科大学博士后流动站太原030001

缺血性脑卒中死亡率和致残率极高,传统治疗方法难以改善现状。而干细胞通过血管再生、免疫调节、抗细胞凋亡、抗氧化应激、细胞替代、分泌营养因子等功能对缺血性脑卒中的治疗发挥作用,成为缺血性脑卒中治疗的研究热点。现主要从干细胞... 详细信息

缺血性脑卒中死亡率和致残率极高,传统治疗方法难以改善现状。而干细胞通过血管再生、免疫调节、抗细胞凋亡、抗氧化应激、细胞替代、分泌营养因子等功能对缺血性脑卒中的治疗发挥作用,成为缺血性脑卒中治疗的研究热点。现主要从干细胞对缺血性脑卒中治疗的神经保护作用及研究进展等方面进行综述,以期为干细胞治疗缺血性脑卒中的进一步临床研究和开发应用提供支持。

关键词：缺血性脑卒中干细胞免疫调节血管再生氧化应激