OBSERVATIONAL STUDY ON THE PRE-TROPICAL CYCLONE SQUALL LINE OF 8 AUGUST 2007 OVER THE COAST OF SOUTH CHINA

A squall line in front of the tropical cyclone Pabuk occurred in the west of the Pearl River Delta to Zhanjiang on August 8th, 2007 when the storm approached South China. The development, structure and environmental conditions for this squall line were investigated in this study, with particular attention paid to the possible connection of this squall line with Pabuk. The observational data employed in this study are from soundings, Doppler weather radars and wind profile radars. The following six major conclusions are drawn by our observational analyses. (1) This squall line developed gradually from individual convective cells, and land breeze may be responsible for the onset of the squall line. (2) The path and intensity of the squall line were modulated by the environmental conditions. The squall line propagated along the coastline, and it was stronger on the landing side of the coastline compared with the surrounding in-land regions and oceanic regions. (3) The typical characteristics of tropical squall lines were seen in this squall line, including the cold-pool intensity, vertical structure and the wake flow stratiform precipitation at its developing and mature phases. (4) The environmental conditions of this squall line resemble those of tropical squall lines in terms of deep moist air and low convection condensation level. They also resemble mid-latitude squall lines in terms of the convective instable energy and vertical wind shear in the lower troposphere. (5) Two roles were played by the strong wind around Pabuk. On the one hand, it made the atmosphere more unstable via suppressed shallow convection and increased solar radiation. On the other hand, it enhanced the land-sea thermal contrast and therefore strengthened the sea breeze and the resultant water vapor transport. The sinking temperature inversion prevented the occurrence of low-layer weak convection and accumulated convection instability energy for the development of the strong convection.     

数字航空影像的质量控制和检查

科技进入21世纪以后,航空摄影测量技术已经全面步入数字化时代,数字航空影像成为摄影测量工艺的重要数据源,直接影响了成图的质量和精度。但是在实际生产应用中,数字航空影像的生产和质量检查一直没有完整的行业规范加以指导,造成影像数据在后续的应用中暴露出很多问题。本文是作者从生产实践的角度,对数字航空影像的质量检查和过程控制总结出的一系列经验。     

导管架式基础和上升式上部设施简易平台

南海北部湾有一些断块构造油田,多半属于边际油田。这些油田的开发,需要采用可重复利用的简易平台,才有利可图。本文介绍的平台就是为了适应这种需要而开发的。该平台分为上、下两大部分,即导管架垫式基础和上升式上部设施,是一种利用成熟技术,通过创造性的组合而形成的一种崭新概念的新型平台。     

深埋长大隧道岩爆预测与工程防治研究

岩爆是深埋长大隧道面临的最主要的地质灾害之一,准确的岩爆预测对保障施工过程中人员、设备的安全具有重要意义。以拉林铁路巴玉隧道为研究对象,依据隧道沿线现场调查工作及试验研究成果,评价了工程区岩体的整体性和岩爆倾向性;以工程地质条件为基础,综合分析隧道工程区地应力场环境及邻近工程实测地应力成果,利用工程类比和三维数值反演方法获得隧道工程区初始应力场;选取隧道横断面作平面应变分析,计算获得开挖后隧道沿线围岩二次应力场;最后利用修改后的谷-陶岩爆判据对隧道全段进行岩爆状态预测,结果表明隧道多段具有发生中等或高等岩爆的可能。     

IMPROVEMENT OF REGIONAL PREDICTION OF SEA FOG ON GUANGDONG COASTLAND USING THE FACTOR OF TEMPERATURE DIFFERENCE IN THE NEAR-SURFACE LAYER

The relationship between the factor of temperature difference of the near-surface layer(T_(1000 hPa)-T_(2m))and sea fog is analyzed using the NCEP reanalysis with a horizontal resolution of l°xl°(2000 to 2011) and the station observations(2010 to 2011).The element is treated as the prediction variable factor in the GRAPES model and used to improve the regional prediction of sea fog on Guangdong coastland.(1) The relationship between this factor and the occurrence of sea fog is explicit:When the sea fog happens,the value of this factor is always large in some specific periods,and the negative value of this factor decreases significantly or turns positive,suggesting the enhancement of warm and moist advection of air flow near the surface,which favors the development of sea fog.(2) The transportation of warm and moist advection over Guangdong coastland is featured by some stages and the jumping among these states.It also gets stronger over time.Meanwhile,the northward propagation of warm and moist advection is quite consistent with the northward advancing of sea fog from south to north along the coastland of China.(3) The GRAPES model can well simulate and realize the factor of near-surface temperature difference.Besides,the accuracy of regional prediction of marine fog,the relevant threat score and Heidke skill score are all improved when the factor is involved.     

雅江6.0级地震前后的重力变化异常特征

对川西地区2000～2001年雅江—康定间6．0级地震前后的重力观测资料进行了处理，绘制了重力场变化等值线图和三维曲面图，从动态的观点研究了雅江地震前后重力场的图像变化特征。结果表明：①重力变化与构造环境变化有关，地震前重力场有明显的异常变化。②雅江地震前后重力场空间分布图较好地反映了鲜水河断裂带及北西向的理塘断裂和北东的玉龙西断裂构造活动弓l起的重力变化。③地震发生在重力异常下降区及高梯度带附近。     

多视角影像自动化实景三维建模的生产与应用

多视角摄影是近年国际上新兴发展的航空摄影技术。本文依托项目介绍了以多视角航摄获取的多视影像数据采用基于图像的自动化建模技术进行数字城市实景三维模型数据生产的技术和流程;进行了数据成果的质量检测及评定,并据此对数据成果进行了相应的分析;最后结合该技术陈述了笔者的观点,对于多视角摄影测量技术的应用和实景三维模型数据的自动化生产具有较好的参考作用。     

迈开跨越性的步伐——右江矿务局“三化”建设掠影

<正>2008年和2009年,对广西右江矿务局一万多名职工及矿区47000人口来说,无疑是一段难忘的岁月。随着"机械化、信息化、安全质量标准化"建设在该局塘内煤矿打响,这家广西最大的国有煤炭生产企业在跨过半个世纪之后终于揭开新的历史篇章,迎来从生产工艺到生产能力飞跃性的历史大变革,迎来了矿区翻天覆地的沧桑巨变。     

2003年胶州湾红岛海域生物现状的初步研究Ⅰ--浮游植物现状的初步调查与研究

根据2003年10月底和11中旬对胶州;弯红岛海域的大面积调查资料,对该海域的浮游植物进行了初步研究。调查结果表明,本次调查多数监测站位浮游植物样品的多样性指数大于3而呈健康状态,海域浮游植物个体数量,小潮的测值低于大潮的测值。     

广西青狮潭水库水体喹诺酮类抗生素的分布特征及生态风险评价

利用高效液相色谱法对桂林市青狮潭水库喹诺酮类抗生素（氧氟沙星（OFX）、诺氟沙星（NOR）、环丙沙星（CIP）、恩诺沙星（ENR））进行监测,并分析其污染来源和生态风险.结果表明：青狮潭水库水体中氧氟沙星、诺氟沙星、环丙沙星和恩诺沙星的检出浓度范围分别为50.00~660.13、3.70~5.00、3.49~6.22和4.59~6.06 ng/L;与国内河流抗生素浓度水平相比,青狮潭水库水体中喹诺酮类抗生素浓度处于中等偏低水平;青狮潭水库水体喹诺酮类抗生素浓度与水体理化性质的相关性分析表明：NOR浓度与pH相关性极显著、与浊度相关性显著,CIP浓度与总磷浓度相关性显著,OFX和ENR浓度与理化指标无显著相关性;生态风险评价结果表明青狮潭水库东湖区、西湖区水体中OFX存在高风险,NOR、CIP与ENR处于中等风险水平.