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Status and trends in the stability of the three largest ice shelves in Antarctica

Science China Earth Sciences 2024年第8期67卷 2615-2632页

作者： Rongxing LI Guojun LI Lu AN Menglian XIA Da LV Yuan CHENG Aiguo ZHAO Tian CHANG Xiangbin CUI shengkai zhang Shijie LIU Yixiang TIAN Weian WANG Center for Spatial Information Science and Sustainable Development Applications Tongji UniversityShanghai 200092China College of Surveying and Geo-informatics Tongji UniversityShanghai 200092China Postdoctoral Research Station of Shanghai Surveying and Mapping Institute Shanghai 200063China Key Laboratory of Spatial-temporal Big Data Analysis and Application of Natural Resources in Megacities Shanghai 200063China Institute for Conservation of Cultural Heritage School of Cultural Heritage and Information ManagementShanghai UniversityShanghai 200444China Polar Research Institute of China Shanghai 200136China Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China

The Ross,Filchner-Ronne,and Amery ice shelves are the three largest ice shelves in Antarctica,playing a crucial role in supporting the Antarctic ice ***,current studies on the stability of the three largest ice shelves primarily focus on singular or limited factors,lacking a comprehensive assessment of multiple *** systematically and in-depth study the stability and trend of the three largest ice shelves,we comprehensively collected and analyzed key parameters,including elevation changes,basal melting,surface meltwater,major rifts propagation rate,suture zones,ice front area change rate,grounding lines,ice velocity,and mass ***,we selected the collapsed Larsen B Ice Shelf(LBIS),the rapidly changing and structurally weakened Pine Island Ice Shelf(PIIS),and the accelerating Totten Ice Shelf(TIS)as reference ice *** comparing and analyzing the key parameters between these reference ice shelves and the three largest ice shelves,we find the status and trends in the stability of the *** findings reveal that most key parameters of the three largest ice shelves present relatively minor variations compared to those of the reference ice ***,50%of the parameters are smaller than those of the accelerating TIS,88%are smaller than those of the rapidly changing PIIS,and all parameters are smaller than those of the collapsed ***,after analyzing parameters that are not smaller than those of the TIS,it is observed that they remain in a stable ***,the three largest ice shelves are currently undergoing natural changes that do not threaten their stability in the short ***,the evolution of the ice shelves under global climate change remains uncertain,making long-term observation and monitoring essential to assess their impact on sea level rise.

关键词： Three largest ice shelves in Antarctica Key parameters Remote sensing monitoring Ice shelf stability Sea level change

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基于 GNSS-IR 技术的南极海冰积雪深度反演研究

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测绘地理信息 2024年第3期49卷 14-18页

作者：曾棋张胜凯龚力肖驰李斐武汉大学中国南极测绘研究中心湖北武汉430079 中国地震局地震大地测量重点实验室湖北武汉430071 湖北省地震局湖北武汉430071

南极海冰的生长消融与全球气候变化密切相关,而海冰上覆盖的积雪会对海冰的生长消融产生较大的影响。利用南极中山站附近海冰上的GPS数据,采用GNSS-IR(GNSS interferometric reflectometry)技术对海冰上覆积雪深度进行反演。首先,采用... 详细信息

南极海冰的生长消融与全球气候变化密切相关,而海冰上覆盖的积雪会对海冰的生长消融产生较大的影响。利用南极中山站附近海冰上的GPS数据,采用GNSS-IR(GNSS interferometric reflectometry)技术对海冰上覆积雪深度进行反演。首先,采用最小二乘谐波分析(least-squares harmonic estimation,LS-HE)方法提取反射信号的主波峰,计算反射面到天线相位中心的距离;其次,采用DBSCAN(density-based spatial clustering of applications with noise)聚类算法对反演结果进行质量控制;最后,利用现场实测雪深数据对反演结果进行了验证,平均偏差为-0.01 m,RMSE为0.012 m,表明GNSS-IR技术能够有效反演海冰表面积雪深度。

关键词： GNSS-IR 南极海冰最小二乘谐波分析积雪深度 DBSCAN聚类算法

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无人机航测在送电线路工程中的辅助应用

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测绘通报 2024年第S2期 42-45,55页

作者：马超高兴国张胜凯肖峰侯铮山东电力工程咨询院有限公司山东济南250013 武汉大学中国南极测绘研究中心湖北武汉430079 极地环境监测与公共治理教育部重点实验室(武汉大学) 湖北武汉430079 丰图科技(深圳)有限公司广东深圳518000

无人机航测以其快速获取高精度地形数据和图像的能力被广泛应用于送电线路工程。本文系统介绍了无人机航测系统及其在送电线路工程中的典型应用,并以某220 kV线路工程为例,介绍了无人机激光雷达点云进行交叉跨越测量的方法。经工程验证... 详细信息

无人机航测以其快速获取高精度地形数据和图像的能力被广泛应用于送电线路工程。本文系统介绍了无人机航测系统及其在送电线路工程中的典型应用,并以某220 kV线路工程为例,介绍了无人机激光雷达点云进行交叉跨越测量的方法。经工程验证,应用无人机航测技术获取送电线路工程场景影像、高程、点云等数据,基于这些数据进行线路规划、工程设计和施工管理等,具有高精度、快速获取、全方位覆盖、高效率等优势。

关键词：无人机航测激光雷达点云送电线路工程

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THE　VALUE　OF　COMPOSITION　GAMES　AND(0,1)　NORMALIZATION　GAMES(Ⅰ—Ⅱ)

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Applied Mathematics(A Journal of Chinese Universities) 1997年第2期12卷 205-214页

作者： zhang shengkai, YAN HUIZHEN AND zhang YADONG Dalian Institute of Light Industrial Technology Dalian

Abstract In this paper we have studied n person game problems of (0,1) normalization and composition. Also we have concerned multilinear extensions of composition games and especial games [5—7,9—14]. As we have... 详细信息

关键词： Normalization game composition multilinear extension Shapley value

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Convex linear generalization of random coalition games

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Chinese Science Bulletin 1998年第9期43卷 713-716页

作者： shengkai zhang Yadong zhang Huizhen Yan Qiyi Wang Dalian Inst Light Ind Technol Inst Operat Res Dalian 116001 Peoples R China North East Univ Shenyang 110006 Peoples R China

The solution of convex linear combinational game of the random coalition games on the ZS-Axiom is given. With this solution, the scale of the solution to combinational game and the scale of convex linear combinational... 详细信息

关键词： random coalition convex linear generalization ZS-value Shapley value.

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Evaluation of the glacial isostatic adjustment(GIA) models for Antarctica based on GPS vertical velocities

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Science China Earth Sciences 2020年第4期63卷 575-590页

作者： Fei LI Chao MA shengkai zhang Jintao LEI Weifeng HAO Qingchuan zhang Wenhao LI Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China

Due to the scarcity of data, modeling the glacial isostatic adjustment(GIA) for Antarctica is more difficult than it is for the ancient ice sheet area in North America and Northern Europe. Large uncertainties are observed in existing GIA models for Antarctica. Modern space-based geodetic measurements provide checks and constraints for GIA models. The present-day uplift velocities of global positioning system(GPS) stations at 73 stations in Antarctica and adjacent regions from 1996 to 2014 have been estimated using GAMIT/GLOBK version 10.5 with a colored noise model. To easily analyze the effect of difference sources on the vertical velocities, and for easy comparison with both GIA model predictions and GPS results from Argus et al.(2014) and Thomas et al.(2011), seven sub-regions are divided. They are the northern Antarctic Peninsula, the Filchner-Ronne Ice Shelf, the Amundsen Sea coast, the Ross Ice Shelf, Mount Erebus, inland Southwest Antarctica and the East Antarctic coast,respectively. The results show that the fast uplift in the north Antarctic Peninsula and Pine Island Bay regions may be caused by the elastic response to snow and ice mass loss. The fast subsidence near Mount Erebus may be related to the activity of a magma body. The uplift or subsidence near the East Antarctic coast is very slow while the uplift for the rest regions is mainly caused by GIA. By analyzing the correlation and the associated weighted root mean square(WRMS) between the GIA predictions and the GPS velocities, we found that the ICE-6G_C(VM5a) model and the Geruo 13 model show the most consistency with our GPS results, while the W12a and IJ05_R2 series models show poor consistency with our GPS results. Although improved greatly in recent years, the GIA modeling in Antarctica still lags behind the modeling of the North American. Some GPS stations, for example the Bennett Nunatak station(BENN), have observed large discrepancies between GIA predictions and GPS *** of the

关键词： Antarctica GPS Glacial isostatic adjustment Vertical velocity Uncertainty

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Arctic sea ice thickness variations from CryoSat-2 satellite altimetry data

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Science China Earth Sciences 2021年第7期64卷 1080-1089页

作者： Feng XIAO shengkai zhang Jiaxing LI Tong GENG Yue XUAN Fei LI Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China

Arctic sea ice plays an important role in Earth's climate and environmental *** ice thickness is one of the most important sea ice *** obtaining the sea ice thickness and its changes has great significance to Arctic and global change *** altimeters can be used to derive long-term and large-scale changes in sea ice *** leads detection is vital in sea ice thickness estimation by using satellite *** leads detection methods are compared with remote sensing images,and results show that the detection method that uses waveform parameters can obtain improved *** model for the conversion of freeboard to thickness is optimized by considering the incomplete penetration of snow for radar *** derive the estimates of the Arctic sea ice thickness for November 2010 to December 2019 by using the CryoSat-2 altimetry *** sea ice thickness from the IceBridge and draft data from the upward-looking sonar are used to validate our thickness *** show that the accuracy of our thickness estimates is within 0.2 *** in the Arctic sea ice thickness are analyzed using the PIOMAS model and air and sea surface temperatures.A sharp increase in sea ice thickness is found in 2014.

关键词： CryoSat-2 Arctic sea ice Thickness Global change

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Introduction to game theory

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Chinese Science Bulletin 2003年第9期48卷 841-846页

作者： zhang shengkai & zhang YadongDalian Institute of Light Industrial Technology, Dalian 116034, China Correspondence should be addressed to zhang shengkai (e-mail: ZSK@ ***) Dalian Institute of Light Industrial Technology Dalian 116034 China

The basic ideas of game theory were originated from the problems of maximum and minimum given by *** Neumann in 1928. Later, wars accelerated the study of game theory, there are many developments that contributed to the advancement of game theory, many problems of optimum appeared in economic development process. Scientists applied mathematic methods to studying game theory to make the theory more profound and perfect. The axiomatic structure of game theory was nearly complete in 1944. The path of the development of game theory started from finite to infinite, from two players to many players, from expressing gains with quantity to showing the ending of game theory with abstract result, and from certainty problems to random problems. Thus development of game theory is closely related to the economic development. In recent years, the research on the non-differentiability of Shapley value posed by Belgian Mertens is one of the advanced studies in game theory.

关键词：博弈论公理化结构经济发展支付方程数学方法非可微性夏普利点

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重视骨质疏松性骨折的康复指导,积极预防再骨折——《骨质疏松性骨折中医诊疗指南》解读

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中医正骨 2024年第2期36卷 4-6,16页

作者：王卫国赵建鹏张晟恺山东中医药大学第一临床医学院山东济南250014

骨质疏松性骨折是骨质疏松症最严重的并发症。预防再骨折是骨质疏松性骨折治疗的重点内容,也是治疗后康复的重中之重。《骨质疏松性骨折中医诊疗指南》(以下简称《指南》)中关于预防再骨折的内容,对于骨质疏松性骨折的治疗和康复具有重... 详细信息

骨质疏松性骨折是骨质疏松症最严重的并发症。预防再骨折是骨质疏松性骨折治疗的重点内容,也是治疗后康复的重中之重。《骨质疏松性骨折中医诊疗指南》(以下简称《指南》)中关于预防再骨折的内容,对于骨质疏松性骨折的治疗和康复具有重要指导意义。本文从骨质疏松性骨折后再骨折发生的原因和预防措施两大方面,对《指南》中预防再骨折的内容进行解读,旨在为临床预防骨质疏松性骨折后再骨折提供参考。

关键词：骨质疏松性骨折再骨折指南

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大直径嵌岩灌注桩承载特性试验与有限元模拟

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重庆交通大学学报（自然科学版） 2024年第9期43卷 25-33页

作者：白晓宇刁浩杰银吉超桑松魁张亚妹张胜凯青岛理工大学土木工程学院山东青岛266520 中铁建投(青岛)城市开发建设有限公司山东青岛266031

基于青岛某工程的4根大直径嵌岩灌注桩,在现场开展了单桩竖向抗压静载试验和桩身完整性测试,以明确大直径嵌岩灌注桩在竖向荷载下的承载特征,拟揭示不同荷载水平下嵌岩灌注桩的承载力发挥机制。结合不同嵌岩深度的单桩承载性能有限元模... 详细信息

基于青岛某工程的4根大直径嵌岩灌注桩,在现场开展了单桩竖向抗压静载试验和桩身完整性测试,以明确大直径嵌岩灌注桩在竖向荷载下的承载特征,拟揭示不同荷载水平下嵌岩灌注桩的承载力发挥机制。结合不同嵌岩深度的单桩承载性能有限元模拟,重点分析了单桩在不同嵌岩深度下的竖向抗压承载特性和桩土位移分布特征。研究表明:在笔者试验条件下,大直径嵌岩灌注桩单桩竖向抗压承载力具有一定离散性,桩头部位的损坏会极大影响单桩承载力的有效发挥;加载完成后,数值模拟得到的桩顶沉降量为31.56 mm,约为现场实测值的1.1倍,模拟结果与实测结果较为吻合;通过不同嵌岩比的模拟结果对比发现,嵌岩深度越大桩端阻力占桩顶荷载的比例越小,且桩端阻力占比的变化速率随着嵌岩比的增加逐渐减缓;嵌岩深度取2.5倍桩径为宜。

关键词：岩土工程嵌岩桩泥浆护壁成孔灌注桩单桩竖向抗压承载力承载力异常现场试验数值模拟

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