检索结果-南通市图书馆

维普期刊数据库博看期刊

NUMERICAL STUDY OF EFFECT OF WAVE AROUND SINGLE BREAK-WATER WITH THE swan MODEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2009年第1期21卷 136-141页

作者： KANG Hai-gui ZHANG Hong-wei QU Xiao-ting State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023China

A new version of the Stimulating Wave Nearshore （swan） model （version 40.51） was used to stimulate the evolution of directional irregular wave near a single breakwater and the Wen spectrum was adopted as an input spectrum. The wave diffraction effect of irregular wave, which is the main improvement compared with the previous swan versions, was tested with the experimental data of single breakwater collected in the State Key Laboratory of Coastal and Offshore Engineering （SLCOE） at Dalian University of Technology （DUT） and the stimulated results of Wu Yan and JONSWAP spectrum as input data, respectively. By comparing the results in four cases, it is seen that the results stimulated by the swan model with the JONSWAP or Wen spectra are better than those with Wu＇s spectrum, and the results simulated with the Wen spectrum is little larger than those with the JONSWAP spectrum and more closely approximated to the measured data compared to the results with the JONSWAP spectrum. It is then concluded that the new swan model with the Wen spectrum can be well used to stimulate wave diffraction around a single breakwater.

关键词： breakwater diffraction swan the Wen's spectrum

A potential distribution map of wintering swan Goose(Anser cygnoides)in the middle and lower Yangtze River floodplain,China

在线全文

学校读者我要写书评

暂无评论

Avian Research 2018年第4期9卷 344-353页

作者： An An Yong Zhang Lei Cao Qiang Jia Xin Wang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China School of Life Sciences University of Science and Technology of ChinaHefei 230026China

Background: Reliable information on the distribution of target species and influencing environmental factors is essential for effective conservation management. However, ecologists have often derived data from costly field surveys. The swan Goose(Anser cygnoides), a vulnerable Anatidae species, winters almost exclusively in China's Yangtze River floodplain, but wintering numbers have been steadily decreasing. To better safeguard this unique species, modern modeling approaches can be used to quantify and predict its suitable wintering habitat. Specifically, a potential wintering distribution map of this species is critically ***: This study used the maximum entropy approach to model a distribution map of this species. In total, data from 97 up-to-date sites were extracted from 1263 survey sites(excluding duplicate data). After eliminating spatial autocorrelation, 11 environmental variables, including factors related to climate, land structure, vegetation, and anthropogenic activities, were used for model ***: The prediction distribution map shows that the population has concentrated mainly in the boundary area of Anhui, Hubei, and Jiangxi provinces, especially along the Yangtze River. Modeling results suggest that areas within the middle and lower Yangtze River floodplain, such as those in Hunan and Hubei provinces and the eastern coastal area of Zhejiang Province, demonstrate a potential level of "medium" suitability for this species to ***: Results from this study provide fundamental information for the restoration and management of the swan Goose. Our "visualized" potential distribution map can assist in planning optimal conservation strategies, and consequently may help to increase the number of wintering populations in China.

关键词： swan Goose Species distribution map Maxent Ecological conservation management

Improvement and application of a saturation based wave dissipation function in swan model

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2012年第1期31卷 24-32页

作者： WANG Yi JIANG Xingwei Ocean University of China Qingdao 266100China National Marine Environmental Forecasting Center State Ocean AdministrationBeijing 100081China National Satellite Ocean Application Service State Oceanic AdministrationBeijing 100081China

Wave dissipation characteristics in swan （Simulating Waves Nearshore） model are investigated through numerical experiments. It is found that neither the fully developed integral parameters of wind waves （significant wave height and peak frequency） nor the high frequency spectral tail can be well reproduced by the default wave dissipation source terms. A new spectral dissipation source term is proposed, which comprises saturation based dissipation above two times of peak frequency and improved whitecapping dissipation at lower frequency spectrum. The reciprocal wave age （u./ep） is involved into the whitecapping model to adjust dissipation rate at different wind speed. The Phillips higher frequency saturation parameter in the saturation-based dissipation is no longer taken as a constant, but varies with wave age. Numerical validations demonstrate that both the wind wave generation process and higher frequency spectrum of wind waves can be well simulated by the new wave dissipation term.

关键词： wind wave dissipation higher frequency spectrum swan

Application of swan+ADCIRC to tide-surge and wave simulation in Gulf of Maine during Patriot's Day storm

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2016年第1期9卷 33-41页

作者： Dong-mei Xie Qing-ping Zou John W.Cannon Department of Civil and Environmental Engineering University of Maine National Oceanic and Atmospheric Administration National Weather Service

The southern coast of the Gulf of Maine in the United States is prone to flooding caused by nor＇easters. A state-of-the-art fully-coupled model, the Simulating WAves Nearshore （swan） model with unstructured grids and the ADvanced CIRCulation （ADCIRC） model, was used to study the hydrodynamic response in the Gulf of Maine during the Patriot＇s Day storm of 2007, a notable example of nor＇easters in this area. The model predictions agree well with the observed tide-surges and waves during this storm event. Waves and circulation in the Gulf of Maine were analyzed. The Georges Bank plays an important role in dissipating wave energy through the bottom friction when waves propagate over the bank from offshore to the inner gulf due to its shallow bathymetry. Wave energy dissipation results in decreasing significant wave height （SWH） in the cross-bank direction and wave radiation stress gradient, which in turn induces changes in currents. While the tidal currents are dominant over the Georges Bank and in the Bay of Fundy, the residual currents generated by the meteorological forcing and waves are significant over the Georges Bank and in the coastal area and can reach 0.3 m/s and 0.2 m/s, respectively. In the vicinity of the coast, the longshore current generated by the surface wind stress and wave radiation stress acting parallel to the coastline is inversely proportional to the water depth and will eventually be limited by the bottom friction. The storm surge level reaches 0.8 m along the western periphery of the Gulf of Maine while the wave set-up due to radiation stress variation reaches 0.2 m. Therefore, it is significant to coastal flooding.

关键词： Nor'easter swan ADCIRC Gulf of Maine Patriot's Day storm Tide-surge Wave Coastal flooding

在线全文

学校读者我要写书评

暂无评论

基于swan的基层人影综合业务系统的研究

计算机应用与软件 2022年第8期39卷 338-342,349页

作者：刘国强唐辟如彭宇翔贵州省人工影响天气办公室贵州贵阳550081

针对日益增长的地面作业需求与作业指挥间的矛盾,结合贵州省实际情况,开发建成基于swan的基层人工影响综合业务系统,并对该系统的核心业务功能进行简要介绍。应用结果表明:贵州省基层人工影响综合业务系统的开发建成,改进了数据传输方式... 详细信息

针对日益增长的地面作业需求与作业指挥间的矛盾,结合贵州省实际情况,开发建成基于swan的基层人工影响综合业务系统,并对该系统的核心业务功能进行简要介绍。应用结果表明:贵州省基层人工影响综合业务系统的开发建成,改进了数据传输方式,精简了信息传输步骤,降低了中间过程的时延,提高了数据应用的效率。系统形成贯穿精细化预报数据获取、产品加工、应用服务各环节的集约、高效的信息流程,强化省级的指导作用,市县级配合预警指挥,由炮站具体实施,建设并完善具有贵州省特色的省-市-县-炮站四级人工影响天气业务技术体系,基于集约化的数据环境,建成一体化的人工影响天气综合业务平台,实现了业务平台、软件资源的高效利用和集中管理。

关键词： swan 综合业务人影一体化

基于swan模式精细化网格下的南海特征岛礁波浪及波浪能分析

在线全文

学校读者我要写书评

暂无评论

基于SWAN模式精细化网格下的南海特征岛礁波浪及波浪能分析

作者：付玉成鲁东大学

学位级别：硕士

南海是中国海域里面积最大的海域,由于气候条件和地理位置特殊,南海拥有着富饶的资源,且该海域陆地较少,由大量岛屿构成,对我国来讲,南海各类群岛经济以及战略地位极其重要,同时南海岛礁是海上丝绸之路的重要支点,是南海重要的交通运输... 详细信息

南海是中国海域里面积最大的海域,由于气候条件和地理位置特殊,南海拥有着富饶的资源,且该海域陆地较少,由大量岛屿构成,对我国来讲,南海各类群岛经济以及战略地位极其重要,同时南海岛礁是海上丝绸之路的重要支点,是南海重要的交通运输基地。因此对于开展南海特征岛礁附近波浪场的研究,对我国国防、航运以及清洁能源的开发具有重要意义。本文通过使用第三代海浪模型swan,以Takahashi和Fujita.t公式嵌套计算得到的台风模型风场与ERA5背景风场合成后的风场作为模型的驱动场,以南海的实际水深情况作为地形条件,在南海挑选三个岛屿采用精细化网格,使用数值模拟分析其附近海域1991-2020以来30年的波浪变化情况,包括有效波高的年平均变化情况及季节变化情况、极值波高推算、波浪能流密度的年平均变化情况及季节变化情况和波能流极值推算等,探明该海域波浪能资源的时空变化规律及开发利用前景。从各群岛附近海域波浪变化情况整体来看,常浪方向以NE、ENE向为主,同时在这两个方向上容易出现极端波高,这其中的原因主要是东北季风对各类海域的影响较大,在S向、SSW向也有分布,但出现频率相对较小,且在该方向上极端波高值分布也较小。南海特征岛礁有效波高与周期季节分布有明显的变化趋势,在春季,东北季风逐渐减弱,南海特征岛礁有效波高与周期值最小;冬季东北季风全年最强,南海特征岛礁有效波高与周期在该时刻最大。极值波高呈现出与波高分布相似的分布形式,总体分布为西南高东北低。南海特征岛礁年平均能流密度总体分布情况较为相似,呈现出西高东低的分布形式,从四季情况来看,波浪能流密度从春季开始随着季节变化呈现递增趋势,春季波浪能最小,冬季波浪能最大。从岛附近波浪能流密度大小分布情况来看,美济岛和西沙群岛附近海域波能流密度相比黄岩岛较小。从岛附近海域波浪能流密度变异系数来看,美济岛附近海域波能稳定性较差,而黄岩岛附近海域波浪能全年较为稳定,通过综合比对,总结出波浪能采集和利用在黄岩岛开采比较适合。

关键词：南海特征岛礁 swan 有效波高极值推算

新swan江西本地化平台产品应用和检验评估

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

气象与减灾研究 2022年第2期45卷 151-160页

作者：李海俊单九生张帆江西省气象台江西南昌330096 赣州市气象局江西赣州341000

新swan3.0示范版通过融合“天擎”和LINUX改造等方式使系统框架更高效,在强对流识别算法、产品数量、功能模块等方面较以前版本均有了较大提升。文中使用空间领域TS评分法,并结合典型个例,对平台输出的临近预报效果和强对流识别产品进... 详细信息

新swan3.0示范版通过融合“天擎”和LINUX改造等方式使系统框架更高效,在强对流识别算法、产品数量、功能模块等方面较以前版本均有了较大提升。文中使用空间领域TS评分法,并结合典型个例,对平台输出的临近预报效果和强对流识别产品进行了评估,结果表明:光流外推法和融合外推法结果趋势一致,预报时效越近预报能力越强;预报稳定性方面,大于35 dBz回波整体好于55 dBz以上的强回波中心;光流法预报效果好于融合法;平台能有效识别冰雹、下击暴流等,能为短临监测预警预报业务提供支撑。

关键词： swan 短临预报 TS评分强对流识别

基于swan模型的风生波河道防浪林消浪模拟

在线全文

学校读者我要写书评

暂无评论

河海大学学报（自然科学版） 2019年第4期47卷 323-328页

作者：周悦董增川徐伟任杰王建婷韦一鸣河海大学水文水资源学院

选取嫩江干流佰大街堤防为研究区,综合分析其河道地形与岸线条件,应用地表水模拟系统(surface water modeling system, SMS)差分生成局部加密的非结构三角形计算网格。在此基础上,基于第三代浅水波浪模型(simulating wave nearshore, SW... 详细信息

选取嫩江干流佰大街堤防为研究区,综合分析其河道地形与岸线条件,应用地表水模拟系统(surface water modeling system, SMS)差分生成局部加密的非结构三角形计算网格。在此基础上,基于第三代浅水波浪模型(simulating wave nearshore, swan)模拟防浪林对河道风生波的影响。结果表明:在发生50年一遇洪水时,模型模拟波高与实测波高的相关系数达到0.95,模拟结果较好;嫩江干流佰大街堤防现状防浪林的消浪效果显著,消浪系数达到30.51%;基于非结构三角网格的swan模型能较好地模拟以风生波为主的复杂地形河道内的波浪场。

关键词：护岸工程 SMS swan 防浪林消波模拟影响因素嫩江干流佰大街堤防

基于swan和ECOMSED模式的大风作用下黄骅港波浪、潮流、泥沙的三维数值模拟

在线全文

学校读者我要写书评

暂无评论

泥沙研究 2007年第4期32卷 17-26页

作者：赵群交通部天津水运工程科学研究所天津300456

根据黄骅港外航道淤积问题的具体情况,本文采用三维细颗粒泥沙的ECOMSED模式对黄骅港海域的潮流、泥沙进行了模拟。数值计算结果与潮流为主要动力条件的现场实测结果进行了比较,二者吻合较好。在此基础上,本文采用swan风浪模型和ECOMSE... 详细信息

根据黄骅港外航道淤积问题的具体情况,本文采用三维细颗粒泥沙的ECOMSED模式对黄骅港海域的潮流、泥沙进行了模拟。数值计算结果与潮流为主要动力条件的现场实测结果进行了比较,二者吻合较好。在此基础上,本文采用swan风浪模型和ECOMSED对黄骅港骤淤进行了数值模拟,并与收集到的现场实测资料进行比较,也得到较好的结果。数值模拟显示,波浪是造成黄骅港外航道泥沙淤积的主要动力因素;在以波浪为主的动力条件下,含沙量在波浪破碎带达到最大,并且沿水深变化梯度较大。破碎带当地的泥沙跨过航道落淤是黄骅港外航道淤积的主要原因,岸边泥沙随落潮流下泻不是黄骅港外航道大风骤淤的主要原因。

关键词：黄骅港三维潮流细颗粒泥沙模型 ECOMSED swan