防波堤断面结构型式及护面块体稳定性模型试验研究——2008北京奥运会青岛帆船比赛基地水工模型试验     

史宏达  HAN Gui-Ping  韩桂萍  范天会 《中国海洋大学学报(自然科学版)》2006,36(6):999-1007

为确保2008北京奥运会青岛帆船比赛基地内工程的水工建筑物安全可靠，对给定的2种防波堤断面结构型式及护面块体稳定性进行物理模型试验。准确掌握在极端高水位、设计高水位、设计低水位和极端低水位时．SW向、25a和50a一遇波浪作用下，试验断面所承受的波浪作用力，及SE向50a一遇波浪作用下块体的稳定重量。并绘制各工况1％峰值波压力分布图，得出断面波压力的分布规律。对断面结构和护面块体稳定性进行分析。  相似文献   

2022年北京冬季奥运会人工造雪气象条件初步研究     

毛明策  王琦  田亮 《气候变化研究进展》2018,14(6):547-552

利用北京和张家口地区气象站建站至2016年历年11月至次年3月气象资料,研究2022年北京冬奥会人工造雪地面气象条件,结果表明：降水相态与地面气温(T)和相对湿度线性组合关系密切,通过计算不同温度对应降水相态频率,发现北京T≤-0.2℃,张家口市T≤-0.8℃时,降水相态为雪的频率≥95%;估算了冬奥会和残奥会举办地区域自动气象站2014—2016年赛事期间可造雪时数,发现冬奥期间造雪时数较为充足,残奥期间造雪时数较少,可以采用造雪和储雪结合保证赛事用雪。  相似文献   

Size Distributions of Aerosol Sulfates and Nitrates in Beijing during the 2008 Olympic Games: Impacts of Pollution Control Measures and Regional Transport   总被引：1，自引：0，他引：1  

WANG Xinfeng  WANG Tao  Ravi Kant PATHAK  Mattias HALLQUIST  GAO Xiaomei  NIE Wei  XUE Likun  GAO Jian  GAO Rui  ZHANG Qingzhu  WANG Wenxing  WANG Shulan  CHAI Fahe  CHEN Yizhen 《大气科学进展》2013,30(2):341-353

For the 2008 Olympic Games, drastic control measures were implemented on industrial and urban emissions of sulfur dioxide (SO₂), nitrogen oxides (NO_x) and other pollutants to address the issues of poor air quality in Beijing. To investigate the effects of SO₂ and NO_x reductions on the particulate sulfate and nitrate concentrations as well as their size distributions, size-segregated aerosol samples were collected using micro-orifice uniform deposit impactors (MOUDIs) at urban and downwind rural sites in Beijing before and after full-scale controls. During the sampling period, the mass concentrations of fine particles (PM_1.8) at the urban and rural sites were 94.0 and 85.9 μg m^-3, respectively. More than 90% of the sulfates and ～60% of nitrates formed as fine particles. Benefiting from the advantageous meteorological conditions and the source controls, sulfates were observed in rather low concentrations and primarily in condensation mode during the Olympics. The effects of the control measures were separately analyzed for the northerly and the southerly air-mass-dominated days to account for any bias. After the control measures were implemented, PM, sulfates, and nitrates were significantly reduced when the northerly air masses prevailed, with a higher percentage of reduction in larger particles. The droplet mode particles, which dominated the sulfates and nitrates before the controls were implemented, were remarkably reduced in mass concentration after the control measures were implemented. Nevertheless, when the polluted southerly air masses prevailed, the local source control measures in Beijing did not effectively reduce the ambient sulfate concentration due to the enormous regional contribution from the North China Plain.  相似文献   

地理信息与2008北京"数字奥运"     

刘丽芬  王鹏 《地理信息世界》2003,1(3):28-30,38

首先简述了2008年北京奥运会的“数字奥运”计划，然后讨论了地理信息在“数字奥运”中可能的应用领域，最后总结了“数字奥运”给我国的地理信息产业带来的机遇和挑战。  相似文献   

遥感技术在北京奥运场馆规划和审视中的应用   总被引：2，自引：0，他引：2  

赵有松  李京伟 《国土资源遥感》2003,14(1):20-22

根据2008年北京奥运会提出的"人文奥运、绿色奥运、科技奥运"的理念,本文结合遥感领域的技术发展,提出了使用数字正射影像图对奥运场馆进行选址和规划; 使用城市热场分布图对绿地进行规划; 使用城市三维景观模型审视拟建场馆并进行场馆改建后展示的方法.同时,也介绍了基于航天航空影像的数字正射影像图、城市热场分布图及城市三维景观模型的制作过程,并通过相关事例证明遥感技术不仅可以为决策、规划和建设部门在奥运村的选址、规划、设计和建设工作时,提供相关的、科学的基础信息和决策信息,还可以保障奥运场馆规划、基础设施建设和相关区域改造的正确和科学性.  相似文献   

A Gibbs sampling disaggregation model for orographic precipitation     

《International Journal of Applied Earth Observation and Geoinformation》2013

Hydrological applications in complex topographic areas need high spatial resolution precipitation data. Some daily high-resolution products are now available for recent past data, even in complex terrain. While the spatial resolution of Regional Climate Models (RCMs) and operational meteorological models are becoming increasingly fine, there still exists a mismatch between the spatial resolutions of observed or estimated recent past data and simulated or forecasted precipitation.Statistical disaggregation models can generate precipitation on a high-resolution grid using as input a mesoscale precipitation grid (e.g., RCM or meteorological grid). In this paper, a Gibbs sampling disaggregation model previously developed for flat areas is adapted to account for topography. Only one variable, the topographic anomaly, is added to the original model. The model is applied on a 300 km × 300 km area in the northwestern United States, covering the Olympic Mountains and the Cascade Range. Daily high-resolution precipitation data for the 2002–2005 period are used to estimate the model parameters. Using 750 days taken from the 2006–2008 period, 36, 52-km grid boxes are disaggregated on 4.3-, 8.7-, 13-, 17.3- and 26-km grids; each day being simulated nine times. Thank to the Gibbs sampling algorithm, the original model, which does not account for topography, is able to capture the mesoscale topographic structure of the daily precipitation, while the adapted model accounting for topography is better suited to recreate the local impact of topography on interannual means, interday standard deviation, and maximum values. The model outputs could be used by hydrological modelers who need high-resolution precipitation data in complex topographic area application.  相似文献   

The Structure and Evolution of Sea Breezes During the Qingdao Olympics Sailing Test Event in 2006     

SHENG Chunyan  Ming XUE  GAO Shouting 《大气科学进展》2009,26(1):132-142

Using data from automatic surface weather stations,buoys,lidar and Doppler,the diurnal variation and the three-dimensional structure of the sea breezes near the sailing sites of the Good Luck Beijing— 2006 Qingdao International Regatta from 18 to 31 August 2006 are analyzed.Results show that excluding rainy days and days affected by typhoon,the sea breezes occur nearly every day during this period.When Qingdao is located at the edge of the subtropical high at 500 hPa,the sea breeze is usually stronger,aroun...  相似文献   

RBAC技术在奥运气象服务信息发布系统中的应用   总被引：1，自引：0，他引：1  

王玉彬  周勇  周海光  余东昌  苏德斌  梁丰 《气象》2009,35(3):107-111

结合2008年北京奥运会气象服务信息发布系统的研发,对比分析了目前数据传输业务系统中几种常用的监控方式,提出了针对奥运气象服务信息发布系统运行状态进行安全、有效、便捷监控问题的解决方案,详细论述了应用基于B/S结构的RBAC技术实现分布式监控功能的原理和方法.  相似文献   

青岛奥帆赛高分辨率数值模式系统研制与应用   总被引：7，自引：3，他引：4       下载免费PDF全文

苗世光  孙桂平  马艳  徐晓亮  王晓云  林行  蒋维楣  刘红年  张宁  孙林  王耀庭 《应用气象学报》2009,20(3):370-379

该文初步建立了青岛奥帆赛高分辨率数值模式系统（包括预报模式和释用模式）。预报模式基于Weather Research & Forecast（WRF）模式V3.0,模式设计为网格数60×50×38,水平分辨率500 m。在IBM小型机上用8个线程作15 h预报所需机时约为1 h 20 min,可满足实时业务预报需要。利用高分辨率边界层模式和城市小区尺度模式对该预报结果进行了动力释用（水平分辨率分别为100 m和10 m）。该模式系统于2008年夏季进行了实时运行试验,模式产品在北京奥运气象服务中心青岛分中心使用。结果表明:该模式系统有较强的稳定性和实用性,对城市热岛、海陆风、地形及建筑物影响等局地环流特征有较好的模拟效果。数值试验分析表明:城市化引起城市热岛效应,增大了海陆温差,使海风加强;城市建筑物拖曳作用使风速减小,从而使海风推进速度减缓;精细下垫面资料的引入对海风等局地环流高分辨率数值模拟至关重要。  相似文献   

Mesoproterozoic fluid events affecting Archean crust in the northern Olympic Cu–Au Province,Gawler Craton: insights from 40Ar/39Ar thermochronology     

A. J. Reid  F. Jourdan  E. A. Jagodzinski 《Australian Journal of Earth Sciences》2017,64(1):103-119

The Olympic Cu–Au Province, Gawler Craton, is host to the Olympic Dam and Prominent Hill iron oxide–copper–gold (IOCG) deposits. Both of these deposits and the region between the two are covered by Neoproterozoic to Cenozoic sediment, making inferences about prospectivity in this portion of the Olympic Domain reliant on geophysical interpretation and sparse drill hole information. We present new U–Pb zircon sensitive high resolution ion microprobe (SHRIMP) dates from two basement intersecting drill holes in the region between Olympic Dam and Prominent Hill that show bimodal volcanism occurred at 2555 ± 5 Ma, and was followed by intrusion of tonalite at 2529 ± 6 Ma. Laser ⁴⁰Ar/³⁹Ar dating of biotite and muscovite from the tonalite yields ages around ca 2000 Ma, consistent with slow cooling trends observed in Archean rocks elsewhere in the northern Gawler Craton. Step heating experiments on K-feldspar from the same tonalite yields an age spectrum with older ages around 1740 Ma from the highest temperature steps becoming progressively younger to a minimum of 1565 Ma in the lowest temperature heating steps; this is consistent with either Paleoproterozic cooling to final closure of K-feldspar by 1565 Ma or a reheating event at ca 1565 Ma, with the latter more likely, given the evidence for sub-solidus alteration of the K-feldspar. Sericite within hematite–sericite–chlorite altered portions of the tonalite yield a poorly defined age of ca 1.6 Ga. Taken together the ⁴⁰Ar/³⁹Ar data providing evidence for a fluid event affecting this region between Olympic Dam and Prominent Hill during the early Mesoproterozoic. Low temperature quartz–carbonate–adularia veins occur in <10 cm wide fractures within basalt in one drill hole in this region. Adularia from these veins yields ⁴⁰Ar/³⁹Ar ages that span from ca 1.3–1.1 Ga. This age range is interpreted to approximate either the timing of adularia formation during a hydrothermal event or the timing of resetting of the ⁴⁰Ar/³⁹Ar systematics within the adularia as a result of fluid flow in this sample. This is evidence for a mid-Mesoproterozoic fluid event in the Gawler Craton and necessitates a reconsideration of the long-term stability of the craton, as it appears to have been affected, at least locally, by fluid flow related to a much larger event within the Australian continent, the Musgrave Orogeny.  相似文献