Changes in Sediment Sources in the Southern Muddy Area of Weihai,China,Since the Late Pleistocene:A Record from Rare Earth Elements

The small muddy areas developed in the southern Shandong Peninsula have attracted increasing attention from researchers because of complex changes in sediment sources driven by sea-level fluctuations and land-sea interactions since the late Pleistocene.This study investigates the evolution of sediment sources and their responses to environmental changes since the late Pleistocene,using core WHZK01 collected from the nearshore muddy area in southern Weihai for rare earth element(REE)analysis.In doing so,this work highlights the changing patterns of material sources and the primary control factors.The results reveal that the sedimentary deposits in core WHZK01 exhibit distinct terrestrial characteristics.Discriminant function analysis(F_(D))and source discrimination dia-grams both suggest that the primary sources of these deposits are the Yellow River and adjacent small and medium-sized rivers,although the sources vary among different sedimentary units.Furthermore,the DU3 layer(17.82-25.10 m)displays typical riverine sedimentation,dominated by terrestrial detrital input,primarily from the local rivers,namely the Huanglei and Muzhu Rivers.The material in the DU2 layer(14.91-17.82 m)is mainly influenced by a mixture of the Qinglong and Yellow Rivers.The DU1 layer(0-14.91 m)is influenced by sea-level changes during the Holocene,with the Yellow River being the primary source,although there is also some input from local rivers.The changes in sea level during the Holocene and the input of Yellow River material carried by the coastal currents of the Yellow Sea are identified as the main controlling factors for the changes in material sources in the study area since the late Pleistocene,with small and mediumsized rivers also exerting some influence on the material sources.The above mentioned findings not only contribute to a better understanding of the source-sink systems of the Yellow River and adjacent small and mediumsized rivers but also deepen our understanding of the late Quaternary land-sea interactions in the Shandong Peninsula.

Analysis of a Rare Large-scale Hail Process in Yantai and Weihai

A rare large-scale hail process in Yantai and Weihai City in the autumn of 2021 was analyzed based on the surface meteorology,high-altitude observation and S-band radar detection data.The results showed that this process was influenced by shallow trough,and strong upper-level jet stream in the middle and upper levels guided the intrusion of mid-level cold air into the warm and humid environment at the lower level.The shear lines and trunk lines in the lower level also provided certain triggering conditions for uplift,brewing conditions suitable for the occurrence and development of strong convection.The vertical wind shear was unusually large,and vertical wind shear was up to 10 m/s at 0-1 km,20 m/s at 0-3 km,and 32 m/s at 0-6 km,which was conducive to the growth of the storm.In this process,isolated multi-cell thunderstorm was generated at the beginning,and then it developed and strengthened continuously,moving to the southeast.In the later stage,a convection cell was born at the boundary between Yantai and Weihai,and developed into supercell storm.The storm lasted for a long time,and continued to develop and strengthen as it moved eastward,affecting most areas of Weihai from northwest to southeast.In the development stage of the storm,the radar reflectivity factor had obvious characteristics of hook echo and three-body scatter spike,and there was echo overhang and other hail echo features in the middle layer.Weak mesocyclone appeared at a low elevation,and there was the potential for the occurrence of tornado.

Polyphase Deformation of the Weihai-Rongcheng UHP Unit Rocks,NE Sulu:Insights into the Tectonic Evolution of the Dabie-Sulu UHP and HP Belts,China

Different scales of structural data reveal a complex deformation history of ultrahigh- pressure （UHP） rocks exposed in the Weihai-Rongcbeng area, NE Sulu （northern Jiangsu-eastern Shandong）, eastern China. Excluding pre-UHP deformations, at least five major sequential deformational stages （D1-Ds） are recognized. The first deformation （DO produced a weak foliation and lineation in massive eclogites. The foliated eclogite with a dominant foliation containing a stretching and mineral lineation was developed during the I）2 deformation. Both the D1 and D2 deformations occurred under UHP metamorphic conditions, and are well preserved in the eclogite bodies. D3 structures which developed shortly after the formation of granulite/amphibolite facies symplectites are characterized by imbricated associations marked by a regional, steeply dipping foliation, compositional layering, eclogite boudinage, isoclinal folds and reverse ductile shear zones. The D3 deformation was accompanied by decompressional partial melting. A regional, gently dipping amphibolite facies foliation and stretching lineation, low-angle detachments, and dome- and arc-shaped structures formed during the D4 deformation stage dominate to some degree the map pattern of the Weihai-Rongcbeng UHP domain. The last stage of deformation （Ds） gave rise to the final exhumation of the UHP rocks. Ds is characterized by development of brittle-dominated high-angle faulting associated with emplacement of large volmnes of undeformed granite plutons and dykes dated at 134-100 Ma. The deformational and metamorphic sequence followed by the UHP rocks in the Weihai-Rongcheng area is similar to that studied in the entire Dabie-Sulu UHP and HP metamorphic belts from microscopic to mapping scale. Based on structural data, combined with available petrographic, metamorphic and geochronological data, a speculative tectonic evolutionary model for the Dabie-Sulu UHP and IIP belts is proposed, involving continental subduction/collision between the Sino-Korean and Yangtze cratons and subsequent polyphase exhumation histories of the UHP and IIP metamorphic rocks.

Composite Metallogenic Systems in the Weihai Area of Shandong and Evolution of Continental Dynamic Regimes

Based on 9 sheets of 1：50,000-scale regional geological survey and guided by the theory of metallogenic systems and integrated analyses of the structural and metallogenic features, this paper hereby puts forward the composite metallogenic systems of the Weihai area, Shandong Province, aiming at solving the problems on the origins and ore-controlling structures of the numerous deposits in the area. Its scientific significance is reflected in the following three aspects： （1） The basic features of the composite metallogenic systems can be recognized, which consist of two types： the Proterozoic metamorphic-hydrothermal metallogenic system and the Mesozoic magmatic-hydrothermal metallogenic system （i.e. the Indosinian-early Yanshanian contact metasomatic metallogenic series and the mid-late Yanshanian magmatic-hydrothermal metallogenic series）. The two series display arcuate and NW-right lateral arrangements and a N-S parallel zonal distribution respectively, with the corresponding mineral assemblages being Au＋Ag＋Pb＋Zn, etc.; and Cu＋Mo＋Fe, Au＋Ag＋Cu＋Pb- Zn＋Mo＋Co-Ni＋sulfides＋silicides＋K-feldspar, etc. （2） The composite metallogenic systems may be used to interpret the complicated genetic relations of the deposits. Through analyses of the relations between the three main metallogenic intervals and their corresponding source rock series （the Jingshan and Rongcheng groups; the Wendong super-unit and the early-middle Yanshanian Weideshan super-unit; and the mid-late Yanshanian Weideshan and Laoshan super-units） as well as a case study of the Fanjiabu gold deposit, we have distinguished the consanguinity between the contact metasomatic （skarn-type） metallogenic series and the magmatic-hydrothermal metallogenic series as well as the noncognate superposition between the two and the metamorphic-hydrothermal metallogenic system. （3） The composite metallogenic systems are easily related to the evolution of continental dynamic regimes. The formation of the metamorphic-hydrothermal metallogenic system has undergone transformations of three different types of tectono-dynamic regimes from extension→compression→ shearing; that of the contact metasomatic （skarn-type） metallogenic system from compression→extension→compression; and that of the magmatic-hydrothermal metallogenic system from extension →subductive compression of the Pacific Plate. The evolutions of the three types are all attributed to the opening-closing or divergence-convergence of the paleocontinent, and all their mineralization corresponds to the interval of transformation from the end of convergence to early integration of the Weihai paleocontinent. All these will benefit our deeper study of the dynamics of continental metallogenic processes.

KoreainvestedenterprisesandthedevelopmentofWeihai

with the implementation of opendoor policy of the P.R.China, Shandong's coastal area, relying on its advantageous location and abundant resources, has become one of the most rapidly developing areas in northern China for ten years or so. In the process of the development of Weihai, Koreainvested enterprises have been playing a more and more important role. Taking Weihai as an example, this paper attempts to make a preliminary study mainly on the relationship between the Korean direct investment and the economic development in China's port cities concerned.

Composition, Source and Environmental Indication of Clay Minerals in Sediments from Mud Deposits in he Southern Weihai Offshore, Northwestern Shelf of the South Yellow Sea, China

Studying the sedimentary characteristics of the muddy area along the Yellow Sea shelf is of great significance for deep-ening the understanding of the climate and environment evolution since the last glacial period.Recently,a small muddy area developed in the southern Weihai offshore has attracted a lot of attention.Based on high-resolution grain size,clay mineral,AMS14C,and OSL data of sediments from the core WHZK01 in the muddy area,we acquired a new understanding of sedimentary characteristics,sources and paleoclimatic environment during the last 13 kyr.The results show that the core WHZK01 sediments were mainly from the Yellow River and local rivers along the coast.However,the sources varied for different deposition units.The riverbed(before 13 kyr BP)and fluvial plain deposits(13-10 kyr BP)were mainly from local river inputs.The very thin littoral deposits from 10 kyr BP to 8 kyr BP also mainly originate from coastal river inputs,while the littoral-neritic deposits since 8 kyr BP were dominated by the Yellow River materials and partly supplied by the coastal rivers and the island erosion.In addition,five events related with the strong East Asian winter monsoon(EAWM)during the intervals of 13.0-11.0 kyr BP,10.0-8.2 kyr BP,7.0-5.0 kyr BP,3.5-2.5 kyr BP,and 1.2-0.5 kyr BP were iden-tified.Three events related with the enhancement of the EAWM since the middle Holocene have strengthened the transport capacity of the coastal currents of the Shandong Peninsula.Meanwhile,more Yellow River-derived distal sediments were deposited to the southern Weihai offshore and formed wedge-shaped muddy bodies.In short,the ratio of smectite/illite could be used as an effective EAWM indicator since 13 kyr BP on the northwestern shelf of the South Yellow Sea.

696 Weihai Road:A Contemporary Art Scene in Shanghai & Open Workshops

Upon entering the lane leading to 696 Weihai Road one encounters a ramshackle area ot disused and decaying warehouses and factories. Proving to be the perfect spot for artists seeking a fordable rents, many of these spacious interiors now serve as studios. Since 2006 more than thirty artists from all over the world have moved into the area.

威海市夏季臭氧及大气氧化性特征分析

威海市属于我国北方典型沿海城市,近年来的持续观测发现夏季易出现臭氧(O_(3))污染。以2023年夏季观测数据为约束,利用零维盒子模式分析威海市夏季O_(3)及大气氧化性特征,给出O_(3)污染防治的建议。2023年5月30日—6月30日,威海市污染天的首要污染物是O_(3),烷烃是挥发性有机物(VOCs)中浓度占比最高的组分,烯烃则是活性占比最高的组分。从清洁日到污染日烯烃活性增强最显著,O_(3)的化学生成和大气氧化性在污染日均有增加,促进了二次污染过程的发生。威海夏季大气氧化性水平较强,O_(3)对前体物的敏感区处于氮氧化物(NOx)和VOCs的过渡区,O_(3)污染防控需结合NOx和VOCs进行协同防控。O_(3)对前体物烯烃减排的变化最敏感,因此其污染防控过程需结合VOCs反应活性开展。基于威海市夏季观测数据分析O_(3)及大气氧化性特征,从O_(3)敏感性区域变化及VOCs反应活性角度为O_(3)污染防治策略提供了思路。

威海市≥35岁居民高血压患病情况及影响因素分析

目的:了解威海市≥35岁居民高血压患病情况,分析其影响因素。方法:采用整群抽样法抽取2022年1—2023年8月威海市4个社区≥35岁的居民,共计6 444名,根据是否患有高血压将6 444名居民分为高血压组、无高血压组,比较两组临床资料,分析威海市≥35岁居民高血压患病影响因素。结果:6 444名居民中患有高血压2 064名,患病率为32.03%,性别、年龄、BMI、合并高血脂、合并糖尿病、户口所在地、吸烟、锻炼习惯、睡眠质量是威海市≥35岁居民患高血压的独立影响因素(P<0.05)。结论:威海市≥35岁居民高血压患病率处于较高水平,性别、年龄、BMI、合并高血脂、合并糖尿病、户口所在地、吸烟、锻炼习惯、睡眠质量是威海市≥35岁居民患高血压的独立影响因素,建议社区服务中心针对危险因素加强高血压的防治工作。

山东省威海市刘公岛周边海域海底沉积物粒度特征及沉积动力环境研究

为系统分析刘公岛周边海域沉积物粒度特征及沉积动力环境,本次研究在充分收集以往资料的基础上,结合本次测试结果,对沉积物类型及粒度特征进行了总结。研究结果表明:区内沉积物类型主要有4种,分别为含砾泥((g)M)、砾质泥(gM)、砂质粉砂(sZ)、粉砂(Z),其中砂质粉砂与粉砂分布最广;区内平均粒径整体呈东南向西北递增的趋势,分选性整体为差,偏态属于正偏范畴,峰态以中等型为主;区内沉积物整体位于三角图的左上部位,黏土和粉砂两端沉积物很少,表明区内水动力条件整体较弱。

基于走航监测的威海市VOCs污染特征分析

为推进城市空气质量精细化管理工作的实施,实现VOCs污染源精准治理,利用质谱双通道分析系统,结合手工监测,于2022年9月对威海市重点区域进行了VOCs污染摸排。走航监测期间,VOCs浓度整体表现为工业园区>主城区>郊区,并且3类区域的VOCs组成差别较大。共发现52个异常点位,工业园区最多,占比高达88.5%。根据异常点位物种分析结果,威海市主城区异常点位VOCs主要来自加油站加油时的瞬时排放,郊区异常点位VOCs主要来自道路施工排放和汽修喷涂排放,工业园区VOCs主要来自有机化工、表面涂装、包装印刷等行业的无组织排放。根据臭氧生成贡献主要因子和B/T特征值,建议主城区应加强对机动车尾气排放、加油站油品挥发、化石燃料燃烧排放等的管控,郊区要重视对机动车尾气、工业溶剂挥发物等的排放管控,工业园区及工业企业较为集中的区域应主要对涉及溶剂使用、涂料使用等相关工艺过程的企业开展针对性排查和管控。

威海市东部滨海新城海域海砂资源分布及特征

对威海东部滨海新城海域海底底质样品、浅地层剖面、地质钻探、多波束测量等资料进行了分析,探讨了该区海砂资源的类型、分布特征及沉积环境。结果表明:研究区海砂资源主要分布于鸡鸣岛和苍家岛潮沟附近,均为埋藏砂矿,以粉砂和细砂为主,含泥量较高,可用作回填用砂。研究区埋藏砂矿主要形成于晚更新世末期,成因类型主要有古冲积、残留和海积等类型。

威海市无花果产业发展现状及对策建议

威海市是著名的无花果之乡,为促进当地无花果产业持续健康发展,本文对威海市无花果产业发展中的优势与劣势进行深入分析,发现威海市无花果具备自然环境、科研技术、贸易环境、产业布局、政策扶持等多重优势,但也存在生产模式落后、栽培品种单一、保鲜贮运能力不足等方面的劣势,因此需要从加快优良品种培育、加强保鲜贮运技术研发、加快产业标准化建设、强化国际经贸交流等四个方面入手推进无花果产业高质量发展。

威海湾表层沉积物地球化学特征及影响因素分析

本文系统分析了威海湾海域表层沉积物地球化学特征,结果表明:沉积物中常量组分含量整体呈西南低、东北高的趋势,与平均粒径呈负相关关系,元素丰度呈接近状态。沉积物中微量元素含量整体呈西高东低的态势,与平均粒径呈正相关关系,元素丰度呈富集状态。通过计算富集系数、污染因子,认为表层沉积物含量与沉积物粒径、入海碎屑物、人类工程活动等息息有关。

无人机视频实时融合技术在威海市应急测绘中的应用

自然灾害场景下的传统应急测绘方式以无人机摄影测量为主,测绘成果的生产需要大量的内业数据处理工作,对受灾现场情况的获取具有一定的滞后性,难以对灾害的具体发生地点进行实时定位并确定受灾范围。基于摄影测量和SLAM理论,本文实现了无人机视频画面与三维场景的融合,并使用线性插值方法对视频融合效果进行了优化,以此为基础建立了无人机实时视频融合系统。通过构建森林防火专题场景,研发几何量测、森林山火火点定位、视频回放等实用功能,可为应急测绘抢险救灾场景提供实时可靠的测绘地理信息支撑。

1973—2023年威海湾海岸线变迁及驱动力分析

海岸线的时空演变是海洋经济发展的重要记录,研究区域海岸线时空演变,分析其演变驱动力对于区域海岸带发展及管控具有重要意义。本文利用1973—2023年多期卫星影像对威海湾海岸线的时空变化进行了分析,结果显示,1973—2023年,威海湾海岸线总长度共增加14.4 km,其中人工海岸增加31.4 km,增量最多,增速在1990—2015年达到最大。未来威海湾近岸区域开发利用时,应严格保持目前岸线走向形态,保护海岸格局不受破坏,依托岸线形态规划陆上景观,强化海岸带分段指引,集约高效利用海岸线,使威海湾宝贵的岸线资源成为威海市“精致城市”发展的重要支撑。

威海市东部滨海新城北部海域沉积物分布特征及沉积环境分析

为研究威海东部滨海新城北部海域沉积环境,本文通过采集区内50个海底表层样,采用移液管法和筛析法进行沉积物粒度分析,在此基础上划分了沉积物类型;采用矩值法计算了粒度参数,研究了各种类型沉积物的分布规律,阐述了其与物质来源和沉积动力的关系。结果表明,研究区沉积物平均粒径在0.04~3.23 mm之间,平均值为0.18 mm;分选系数在1.30~4.70之间;偏度在1.21~3.42,平均值为1.79;峰度值在1.97~8.82之间,平均值为3.97。通过对粒度参数分布特征及沉积环境的研究分析发现,研究区粒级组分含量的分布与沉积物类型分布特征吻合度好,总体表现出离岸越远,沉积物粒度逐渐变细的趋势;同时,研究区海底表层沉积物的分布特征主要受物源和水动力条件的影响。

A quantitative method for storm surge vulnerability assessment – a case study of Weihai city

In traditional vulnerability assessments,a synthetic index method is usually used to select all types of social and economic indexes so that more aspects can be covered;however,the requisite social and economic data are not always available or are not highly relevant to the studied geographical space,which makes it difficult to conduct quantitative calculations.In this paper,a spatial value density assessment method was developed to improve the hazard of place model.First,a three-dimensional(3D)model of a coastal city was obtained using oblique airborne photogrammetry and image-based 3D reconstruction and then,architecture footprints were employed to extract the geometric information of each individual building.Additionally,a vulnerability assessment system was established to quantitatively account for the aggregate economic value of a selected set of urban surface features.Using geographic information system(GIS)techniques,the aggregate value of these urban features within each geographic unit can be accurately calculated to quantify the exposure and vulnerability of coastal cities to storm surge.A vulnerability assessment was conducted using Weihai city as an example.The study shows that vulnerability assessment accuracy was greatly improved by downscaling the assessment granularity from county-level administrative districts to a 1-km grid.

数字科技赋能威海市海洋文旅融合发展路径研究

产业融合是全球经济发展的大趋势,也是世界各国推动产业发展的新选择。文章聚焦威海市海洋文旅融合发展中数字化进程迟缓的状况,以科技成果应用不均衡、数字化创新能力欠缺、服务平台不完善和人才短缺等问题为切入点,对数字科技赋能威海市海洋文旅融合发展所面临的问题进行了讨论。在此基础上,文章提出了均衡推进数字化基础设施建设、强化数字化创新能力、完善服务平台功能建设、健全人才培养体系等具体对策建议,旨在为推动威海市海洋文旅产业实现高质量发展提供借鉴。

提高大口径球墨铸铁管道安装效率的方法

常规的球墨铸铁管道安装施工中,一般采用起重机吊管入沟,再用倒链进行管道安装,这种施工方法存在效率低、工期长、成本高的缺点。威海市河库水系连通工程施工中采用大功率挖掘机吊装、安装一次性管道施工工艺,具有效率高、成本低、质量高的特点,既能保证施工质量,又能提效降费。