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Evaluation of lightning-induced overvoltage on a 10 kV distribution line based on electromagnetic return-stroke model using finite-difference time-domain

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High Voltage 2024年第2期9卷 356-366页

作者： Pan Duan Lianfang Zhang xiaogang huang Jian Sun Yue Qi Qing Yang School of Automation Chongqing University of Posts and TelecommunicationsChongqingChina Chongqing Power Co Tongnan BurChongqingChina China Southern Power Grid Science Research Institute GuangzhouChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

Accurate simulation of lightning-induced overvoltage for overhead distribution lines is helpful to prevent lightning trip *** electromagnetic return-stroke model was used to represent lightning and then a 3D finite-difference time-domain(FDTD)method was adopted to simulate the lightning-induced overvoltage on a distribution line without a field-line coupling *** lightning-induced overvoltage behave for different ground conductivity and varying distance between the distribution line and the lightning channel was *** results showed that the overvoltage waveforms at the centre point of the line corresponding to lightning strikes on the lossy ground and an ideal ground(σ=∞)were similar;however,the peak amplitudes of the waveform were affected by soil conductivity at a close *** relationship between magnitude of the overvoltage and distance can be described by a second-order exponential decay ***,the overvoltage calculated using the proposed model was compared with those obtained based on Agrawal's model and measurements made using the newly developed intelligent insulator on *** these comparisons,it could be concluded that the FDTD method with the electromagnetic return-stroke model produces reasonably accurate results of the attenuated oscillation waveform,which can better reproduce the overvoltage on operational distribution lines.

关键词： lightning distribution return

Advancements and New Frontiers in Offshore Seismic Exploration Technology

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Journal of Earth Science 2024年第5期35卷 1749-1757页

作者： Yuhong Xie Yunfei Ye xiaogang huang Wenbo Sun Yanwen Wei China National Offshore Oil Corporation Beijing 100010China CNOOC Nanhai Oil and Gas Energy Academician Workstation Haikou 570312China CNOOC Research Institute Ltd. Beijing 100028China National Engineering Research Center of Offshore Oil and Gas Exploration Beijing 100028China

0 INTRODUCTION China's external dependence on oil and gas remains high,making the independent exploration and development of oil and gas resources crucial for ensuring national energy security and the sustainable development of the economy and *** 2023,China continued to step up its efforts in offshore oil and gas exploration and development,with offshore crude oil production surpassing 62 million tons,accounting for about 70%of the national increase in crude oil *** offshore oil and gas exploration and development is of great significance for guaranteeing national energy security.

关键词： offshore guarantee continued

特色文化产业赋能中国式乡村现代化——基于鹤庆县的考察

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云南民族大学学报（哲学社会科学版） 2024年第3期41卷 70-77页

作者：范建华黄小刚华中师范大学国家文化产业研究中心湖北武汉430079 贵州民族大学乡村振兴研究中心贵州贵阳550025

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作... 详细信息

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作用。鹤庆县持续推进“一村一业”发展模式,形成了以新华村为引领,覆盖县域整体的特色文化产业发展格局。通过铸牢中华民族共同体意识凝聚中国式现代化建设强大合力、激发和坚持特色文化产业发展的村民主体性地位、以“一村一业”特色文化产业集群推进中华优秀传统文化“两创”等途径,探索出了一条以特色文化产业助力乡村全面振兴、实现中国式乡村现代化的可行之路。

关键词：特色文化产业中国式现代化乡村现代化乡村振兴鹤庆县

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海洋地震勘探技术发展方向

地球科学 2024年第7期49卷 2301-2314页

作者：谢玉洪叶云飞黄小刚孙文博魏衍雯中国海洋石油集团有限公司北京100010 中国海油南海油气能源院士工作站海南海口570312 中海油研究总院有限责任公司北京100028 海洋油气勘探国家工程研究中心北京100028

随着近海油气勘探程度的不断深入,中浅层构造型油气藏占比大幅减少,深水、中深层、超浅层、潜山、岩性和复杂构造领域已成为油气增储上产新的增长极,对地震勘探技术提出新的挑战.为破解这些复杂领域的地质难题,基于变观测系统的小面元... 详细信息

随着近海油气勘探程度的不断深入,中浅层构造型油气藏占比大幅减少,深水、中深层、超浅层、潜山、岩性和复杂构造领域已成为油气增储上产新的增长极,对地震勘探技术提出新的挑战.为破解这些复杂领域的地质难题,基于变观测系统的小面元、高覆盖、超长偏移距、宽/多方位节点等地震采集方式不断涌现,作业方式变得越发复杂,在提升复杂地质条件下地震资料品质的同时,也带来了采集成本的大幅攀升.践行价值勘探开发理念,通过海洋地震勘探技术创新降低采集成本,引领油气高质量发展迫在眉睫.介绍了主要几种国内外海洋经济高效地震采集技术,重点分析了海洋地震勘探技术发展现状、应用成效及前景.在改善海洋地震资料品质、提高采集作业效率的同时,降低采集成本,发展经济技术一体化海洋地震勘探技术,推动产业高质量发展,实2现价值勘探开发.

关键词：价值勘探开发混叠源单船多源压缩感知高效勘探地震勘探

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中国大陆台风远距离极端降水的基本特征

气象科学 2024年第2期44卷 317-327页

作者：黄钰婧黄小刚周燕国防科技大学气象海洋学院长沙410073 解放军31308部队成都610000

台风远距离极端降水可以分为极端小时降水(Extreme Hourly Precipitation,EXHP)和极端持续性强降水(Extremely Persistent Heavy Rainfall,EPHR)两类,因其作用距离远、机理复杂,是强降水业务预报中的重大挑战。为了加深对台风远距离极... 详细信息

台风远距离极端降水可以分为极端小时降水(Extreme Hourly Precipitation,EXHP)和极端持续性强降水(Extremely Persistent Heavy Rainfall,EPHR)两类,因其作用距离远、机理复杂,是强降水业务预报中的重大挑战。为了加深对台风远距离极端降水特征的认识,本文利用2009—2019年中国自动站融合CMORPH卫星降水数据、热带气旋的最佳路径数据集,揭示了中国大陆EXHP和EPHR事件的基本特征。结果表明:环渤海、长江中下游、四川盆地是由台风远距离降水引发的EPHR和EXHP事件的3个高发区,强降水持续时间≥5 h为台风远距离EPHR的判别标准,在3个不同的区域内,EXHP的阈值分别为34.05、30.52及27.19 mm·h^(-1)。EPHR的发生时次与EXHP重合率高。EPHR事件的持续时间最长可达44 h,最大累积降水量可达542.03 mm,而EXHP的小时降水量更强。环渤海地区极端降水多发于夜间到清晨,长江中下游地区多集中在上午,四川盆地则集中在凌晨。造成长江中下游远距离极端降水的最大台风强度在3个地区中最强。极端降水落区与台风的最远距离发生在环渤海地区,可达4333.1 km。

关键词：台风远距离降水极端小时降水极端持续性强降水时空分布特征

Mature typhoon “cloud gyro” model and numerical simulation study

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Science China Earth Sciences 2020年第5期63卷 749-756页

作者： xiaogang huang Xiangcheng LI Xiaoping CHENG Chenxi ZHANG Juli DING College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China PLA Troop 92664 Haiyang 265100China

Due to the coarse temporal resolution of the best track databases for typhoons,some small-scale characteristics of typhoon motion have been *** order to reveal the fine features of typhoon motion,the dense cloud within the radius of maximum wind(RMW)of mature typhoons,defined as a“cloud gyro”that simultaneously spins around its own rotational axis and precesses around the vertical axis,is approximated to a rigid *** on the principles of gyrodynamics,the derived mathematical model of a typhoon track indicates that typhoon movement is composed of translational motion governed by the steering flow and superimposed precessional motion that manifests as the inherent characteristics of typhoon tracks,especially with the external *** temporal resolution numerical simulation of a real case verifies the conclusion of this study,which is that the smaller the RMW,the larger the tangential wind speed or the larger the external torque,and the more obviously precessional motion manifests.

关键词： Mature typhoon Cloud gyro Precession angular velocity

Impacts of the Lowest Model Level Height on Tropical Cyclone Intensity and Structure

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Advances in Atmospheric Sciences 2014年第2期31卷 421-434页

作者： MA Zhanhong FEI Jianfang huang xiaogang CHENG Xiaoping College of Meteorology and Oceanography PLA University of Science and Technology

Variable thicknesses in the lowest half-ηmodel level （LML） are often used in atmospheric models to compute surface diagnostic fields such as surface latent and sensible heat *** effects of the LML on simulated tropical cyclone （TC）evolution were investigated in this study using the Weather Research and Forecasting （WRF） *** results demonstrated notable influences of the LML on TC evolution when the LML was placed below 12 *** TC intensification rate decreased progressively with a lowering of the LML,but its ultimate intensity change was relatively *** maximum 10-m winds showed different behavior to minimum sea level pressure and azimuthally-averaged tangential winds,and thus the windpressure relationship was changed accordingly by varying the *** TC circulation was more contracted in association with a higher *** latent heat fluxes were enhanced greatly by elevating the LML,wherein the wind speed at the LML played a dominant *** changes in the wind speed at the LML were dependent not only on their profile differences,but also the different heights they were taken *** to the enhanced surface heat fluxes,more intense latent heat release occurred in the eyewall,which boosted the storm＇s intensification.A higher LML tended to produce a stronger storm,and therefore the surface friction was reinforced,which in turn induced stronger boundary layer inflow together with increased diabatic heating.

关键词： tropical cyclone lowest model level simulation

Effect of wind-current interaction on ocean response during Typhoon KAEMI(2006)

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Science China Earth Sciences 2013年第3期56卷 418-433页

作者： LIU Lei FEI JianFang CHENG XiaoPing huang xiaogang PLA University of Science and Technology

The Weather Research and Forecasting （WRF） model, the Princeton Ocean Model （POM）, and the wave model （WAVEWATCH III） are used to develop a coupled atmosphere-wave-ocean model, which involves different physical pro- cesses including air-forcing, ocean feedback, wave-induced mixing and wave-current interaction. In this paper, typhoon KAEMI （2006） has been examined to investigate the effect of wind-current interaction on ocean response based on the coupled atmosphere-ocean-wave model, i.e., considering the sea surface currents in the calculation of wind stress. The results show that the wind-current interaction has a noticeable impact on the simulation of 10 m-winds. The model involving the effect of the wind-current interaction can dramatically improve the typhoon prediction. The wind-current interaction prevents excessive momentum fluxes from being transferred into the upper ocean, which contributes to a much smaller turbulence kinetic energy （TKE）, vertical diffusivity, and horizontal advection and diffusion. The Sea Surface Temperature （SST） cooling induced by the wind-current interaction during the initial stage of typhoon development is so minor that the typhoon intensity is not very sen- sitive to it. When the typhoon reaches its peak, its winds can disturb thermocline, and the cold water under the thermocline is pumped up. However, this cooling process is weakened by the wind-current interaction, as ocean feedback delays the decay of the typhoon. Meanwhile, the temperature below the depth of 30 m shows an inertial oscillation with a period about 40 hours （-17°N） when sudden strong winds beat on the ocean. Due to faster currents, the significant wave height decreases as ignoring the wind-current interaction, while this process has a very small effect on the dominant wave length.

关键词： coupled atmosphere-wave-ocean model typhoon wave induced mixing SST cooling wave state

Future Changes in the Impact of North Pacific Midlatitude Oceanic Frontal Intensity on the Wintertime Storm Track in CMIP5 Models

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Journal of Meteorological Research 2020年第6期34卷 1199-1213页

作者： Yao YAO Zhong ZHONG Xiu-Qun YANG xiaogang huang College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073 Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing 210023 Army Academy of Artillery and Air Defense(Nanjing Campus) Nanjing 211132

The storm track and oceanic front play an important role in the midlatitude air–sea *** this study,future changes in the impact of the North Pacific midlatitude oceanic frontal intensity on the wintertime storm track are projected based on climate model outputs from the Coupled Model Intercomparison Project Phase 5(CMIP5).The performance of 13 CMIP5 models is evaluated,and it is found that a majority of these models are capable of reproducing the northward intensification of the storm track in response to the strengthened oceanic *** ensemble means of outputs from six best models under three Representative Concentration Pathway(RCP)scenarios(RCP2.6,RCP4.5,and RCP8.5)are compared with the results of the historical simulation,and future changes are *** is found that the impact of the oceanic frontal intensity on the storm track tends to get stronger and extends further westward in a warming climate,and the largest increase appears in the RCP8.5 *** analysis reveals that the stronger impact of the oceanic front on the storm track in the future may be partially attributed to the greater oceanic frontal impact on the near-surface baroclinicity,which is mainly related to the intensified oceanic frontal impact on the meridional potential temperature gradient under the climate change ***,this process can hardly explain the increasing impact of the oceanic front on the upstream of the storm track.

关键词： storm track midlatitude oceanic front climate change Coupled Model Intercomparison Project Phase 5(CMIP5)