THERMODYNAMIC PROPERTIES AND ROLE OF THERMALS IN THE STRATUS-TOPPED BOUNDARY LAYER

From results of two large-eddy simulation of stratus-topped boundary layer,the structure,thermodynamic prop-erties and role of thermals are investigated by using conditional sampling methods,which divided the thermals into thewarm/moist,cool/dry,warm/dry and cool/moist events.The results show that the main turbulent circulation in thestratus-topped boundary layer is composed of the warm/moist updraft and cool/dry downdraft.Below entrainmentregion,the warm/moist updrafts and cool/dry downdrafts are,respectively,positively and negatively buoyant andcontribute most to total fluxes and variances.Evaporative cooling has important effect on the structure and thermodynamic properties of thermals instratus-topped boundary layer.     

中国海相探矿权区块定量评价方法

在研究了我国海相油气探矿权区块基本油气地质条件、勘探程度、技术经济条件等要素和特点的基础上,给出了48个评价参数和归一化取值参照表,建立了探矿权区块评价工作流程、评分参数及计算公式。提出对我国海相勘探层探矿权区块评价应该注意:与国外海相碳酸盐岩评价的差别;与国内陆相碎屑岩评价的差别;成藏组合的划分;评价内容的有效性、不确定性和评价参数的可信度;成败经验的总结和勘探程度的研究。     

地面加密自动站资料同化和数值模拟

采用美国多部门研制的WRF模式及其四维变分同化系统,对2008年5月长江中下游地区一次强对流暴雨天气过程进行了数值模拟试验;并分别将质量控制前和质量控制后的华东地区地面加密自动站资料加入模式进行四维变分同化试验,与实况进行了对比。结果表明:模拟试验能较好的模拟此次降水过程;而采用四维变分同化经质量控制后的地面加密资料,模式效果最好,使降水预报在降水落区和降水量上都获得较为明显的改善;但质量控制前四维同化改善效果不明显。这说明地面资料的质量控制很重要,它能去伪存真。有效地利用地面加密自动站资料,能使资料的加入与模式更协调,从而得到了最佳的模拟效果。     

Shell model representation as a substitute of LoD3 for 3D modeling in CityGML

The OGC standard for 3D city modeling is widely used in an increasing number of applications.It defines five consecutive Levels of Detail(LoD0 to LoD4 with increasing accuracy and structural complexity),in which LoD3 includes all exterior appearances and geometrical details and subsequently requires much storage space.A new LoD is introduced as shell model with the exterior shell of the LoD3 model and the opening objects like windows,doors as well as smaller faade objects are projected onto walls.In this paper,a user survey is presented.The results of this survey show that the shell model can give users almost the same visual impression as the LoD3 model.Furthermroe,algorithms are developed to extract the shell model from LoD3 model.Experiments show that this shell model can reduce up to 90% storage of the original LoD3 model.Therefore,on one hand it can be used as a substitute for a LoD3 model for the visualization on small displays.On the other hand,it can be treated as a sub-level of detail(SLoD3) in CityGML,since it retains almost the same amount of information but requires much less storage space.     

基于VRMap平台上的电子沙盘研制

通过与国内外数字沙盘制作方式及功能的比较，详细介绍了数字沙盘研究方面的一些方法，并以中原油田数字沙盘的研制为例，选择北京灵图公司的VRMap2．3软件作为平台制作中原油田数字沙盘，为油田开发提供基本资料。     

Discovery of the Natural Deformation Vestige of Gaixia Remains,Guzhen County,Anhui Province,China and Its Implications

Recognition of natural deformation during the excavation of ancient remains and tombs is important for tracing or enriching historic and prehistoric deformation records. Recently, the earthquake agencies,in cooperation with the cultural relics and archaeological institutions, conducted a special excavation investigation to the Gaixia remains archaeological scene in Guzhen,Anhui Province. Faults and fissures were discovered there, which,as demonstrated by the preliminary study,are the traces of two stratum d...     

潮汐水域中污水侧向排放的数值模拟

基于N-S方程,采用深度平均的应力-通量代数全场模型,模拟流场及热水或污染物侧向排入大水体的各向异性的输移扩散规律。模型中采用深度平均的连续、动量、浓度方程进行潮汐流动的数值模拟计算,潮流采用非对称潮流,模拟结果给出了一个周期内流场、污染物浓度场随时间的变化特征。所得的数值结果与他人的模型实验结果非常一致,而较其他结果更合理,说明本模型的合理性和可靠性。     

吉林营城盆地构造演化与聚煤规律

松辽盆地群是我国最大的油气聚集区,营城盆地位于其东部,是松辽盆地群中一个典型的聚煤盆地。松辽盆地群基底构造及构造演化控制着营城盆地的演化和聚煤作用。营城盆地含煤层序为SE3层序,相当于沙河子组,可进一步划分为三个体系域:盆地充填体系域、盆地扩张体系域和盆地萎缩体系域。聚煤作用发生在盆地扩张体系域,为盆地扩张超覆沉积阶段的产物,发育Ⅰ～Ⅲ煤层组。Ⅲ煤层组厚度大,煤层稳定,几乎全区发育,是盆地初始充填体系域和扩张体系域转化期的产物。富煤带分布于上家—饮马河东西向隆起带,呈EW向展布,煤层向凹陷区分叉、尖灭。盆缘断裂构造的差异活动以及盆地构造演化是聚煤作用的主控因素。     

二维任意倾斜地层的层速度计算结果分析

本文主要介绍沙赫(Shan,P.M.)公式,对二维任意倾斜地层的层速度计算的应用效果。依据实际地层剖面Φ、V、Z参数的可能变化,设计18个较为复杂的地层模型进行了大量试算,并与Dix公式计算结果作了对比,表明对任意倾斜地层应采用沙赫公式提取层速度才是适宜的。     

Sr,Nd and O Isotopic Studies on the Genesis of the Huashan Granite Complex1

Abstract Systematical Sr, Nd and O isotopic studies were made on the Huashan granite complex in Guangxi. In combination with the studies of geological, petrological and geochemical data, it is believed that the complex consists of granites of three stages, with different geneses and different source materials. They are not the products of differentiation and evolution of one single consanguineous magma. Granites of the 1st stage are of the Indosinian syntectic type or I type, also derived from a mixed mantle-crustal source. Those of the 2nd stage are of the early Yanshanian syntectic type or I type, also derived from a mixed mantle-crustal source, and those of the 3rd stage are of the late Yanshanian transformed type or S type, derived from a crustal source.