人工植被和流动沙丘近地面层湍流通量的计算     

刘树华  辛国君  陈荷生  冯金朝  刘立超 《气象》1993,19(9):9-13

提出了由Ｂｕｓｉｎｇｅｒ建议的无量纲廓线通用函数形式的近地面层稳定度参数ζ的相似方程分析解。代替了以往采用数值迭代法求ζ，并应用于沙漠人工植被和裸露流动沙丘上的实例资料分析。采用目前广泛应用的空气动力学方法，分别计算了动量和热量交换系数，感热和潜热通量，并由波文比－能量平衡方法进行了验证。结果表明：采用Ｂｕｓｉｎｇｅｒ无量纲通量廓线关系形式的近地面层稳定度参数ζ的相似方程分析解，代替以往惯用的数值  相似文献   

云南耿马7.2级地震地表破裂带研究   总被引：2，自引：1，他引：2       下载免费PDF全文

周瑞琦  俞维贤  谷一山  姚孝执 《地震地质》1990,12(4):291

根据野外考察的实际资料,本文介绍了耿马7.2级地震地表破裂带的展布,结构要素及组合、位移分布等情况。同时依据位错资料对破裂带的应力活动及断裂两盘的运动状态进行了初步分析。认为本次地震发震构造以右旋走滑为主兼具张性,主压应力优势方位为N5°—10°E。断层两盘相对运动的总体方向为N55°W左右,断层运动的滑移角在30°—40°之间  相似文献   

黑河试验中测站设置（夏季）的数值模拟研究     

顾弘道  程麟生 《高原气象》1990,9(2):145-157

本文用具有较高水平与垂直分辨率的数值模式诊断计算了黑河试验区的感热通量和潜热通量,并通过对这些诊断通量的统计分析研究了黑河试验中观测站点的代表性和设置问题,得到在试验区内不同下垫面上设置观测站点的具体方案,以及选择有较好代表性的观测站点的一般原则。  相似文献   

冀东迁安铁矿区早前寒武纪硅铁岩矿层褶皱变形序列     

顾德林  李志忠 《现代地质》1990,4(3):60-69

文中根据硅铁矿层的褶皱形态、复合关系等确定迁安铁矿区在中元古代之前发生过6期褶皱变形,叙述了这6期褶皱的特征和分布,讨论了褶皱的成因。区内各期褶皱形态演化规律反映了变形过程中岩石塑性有规律递减的特点。这一演化规律对研究早前寒武纪地区褶皱变形和指导该区找矿工作有重要意义。  相似文献   

浅层折射波法优化系统在将军崖地质病害调查中的应用     

周鸿秋  顾汉明 《地球科学》1991,16(4):445-452

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EKMAN PUMPING OVER MOUNTAINS          下载免费PDF全文

伍荣生  顾伟 《Acta Meteorologica Sinica》1991,(4)

The analytical results of the previous paper(Wu,1989)are used to study the properties of vertical veloc-ity distribution at the top of the boundary layer.The relative position of a jet like geostrophic flow and el-lipse-shaped orography will affect the characteristic feature of vertical motion at the top of the boundary layerwhen the contributions of friction and orography are taken into consideration simultaneously.  相似文献   

耿马县城烈度异常的地震地质及场地地质条件分析     

俞维贤  谷一山 《地震研究》1994,17(2):177-182

本文通过耿马县城１９８８年１１月６日７．２级地震的宏观列度考察，结合县城区的地震地质及工程地质环境的综合调查研究表明：耿马县城北坡北西向断层的存在是造成耿马县城高烈度异常的主要原因；县城场地质因素的地震易损性指数的分区性是造成县城区建筑物破坏强度出于灶区性差异的重要因素。  相似文献   

Pressure Solution of Sulphides in Some Massive Sulphide Zinc—lead Deposits of Western Canada：Its Significance in Mobilization of Ore—forming Materials   总被引：2，自引：0，他引：2  

顾连兴  ANDK.R.MCCLAY 《中国地球化学学报》1994,13(2):132-141

Pressure solution is a common phenomenon in massive sulphide zinc-lead deposits of western Canada and may have been an important factor leading to the mobilization of ore-forming materials during diagenesis, deformation and metamorphism of sedimentary ores.The control of ductile shear zones over gold mineralization could be explained in view of pressure solution of gold-bearing miner-als under shearing stress and the tesultant mobilization of this metal.  相似文献   

Geochemistry of the Baishitouquan Amazonite—and Topaz—bearing Granite in the Mid—Tianshan Belt,Xinjiang,China     

Gu Lianxing  Yang Hao  Gou Xiaoqin  Guo Jichun  Wang Jinzhu 《中国地球化学学报》1994,13(4):289-304

The Baishitouquan amazonite and topaz-bearing granite is one of the typical high-rubidium and high-fluorine granites in the eastern part of the Mid-Tianshan belt. This intrusion is in sharp contact with Mid-Proterozoic schists, gneisses and marbles, and is composed of four zones transitional from the bottom upwards: leucogranite, amazonite granite, topaz-bearing amazonite granite and topaz quartz albitite. The Baishitouquan granite contains highly ordered K-feldspar, Li-rich mica, Mn-rich garnet, α-quartz and low temperature zircon and is chemically high in Si, K, Na, Al, Li, Rb, Cs and F, and low in Ti, Fe, Ca, Mg, P, Co, Ni, Cr, V, Sr and Ba, with Na₂O<K₂O. Amazonite from the amazonite granite zone contains 1867 ppm Rb. The F contents of bulk rocks are 3040 and 4597 for the amazonite granite and topaz-bearing amazonite granite zones, respectively. These two zones have δ¹⁸O values of 8.97–9.85‰ (SMOW) and show flat REE distribution patterns with strong Eu depletion. K-Ar and Rb-Sr ages of this intrusion are 226. 6 Ma and 209. 6 Ma respectively, with an initial⁸⁷Sr/⁸⁶Sr ratio of 0.987±0.213. The Baishitouquan granite is the product of crystallization of a low temperature, and water, rubidium and fluorine-rich magma, which may have been derived from partial melting of muscovite-rich crustal rocks. Consolidation of this granite involved two contrasting and successive stages: melt crystallization and hydrothermal metasomatism and precipitation. Various geological features of this granite were formed during the transition from the magmatic to the hydrothermal stage.  相似文献   

On The Relationship Between Connectivity And The Continuum Approximation In Fracture-Flow And Transport Modelling     

F. P. M. Guérin  D. M. Billaux 《Hydrogeology Journal》1994,2(3):24-31

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