大厂锡矿的成矿流体   总被引：8，自引：2，他引：8  

李荫清  陈伟十 《岩石学报》1989,5(3):12-24

本文详细研究了矿带内流体包裹体特征,测定了不同类型包裹体在冷热状态下相的转变点温度,利用有关的NaCl-H_2O体系、CO_2-NaCl-H_2O体系相图获得了矿带内不同类型矿床成矿的温度、压力等物理、化学参数。通过包裹体成分和同位素研究,阐明了成矿流体的性质、来源及其演化特征,探讨了成矿流体的沸腾和不混溶作用以及它们对成矿所作的贡献。估测了矿化深度和盲矿体存在的可能性。  相似文献   

一类超线性椭圆方程组解的存在性     

于锦海 《测绘学院学报》1991,(2)

本文研究半线性椭圆方程组在Ω中以及Dirichlet边界条件u|Ω=V|Ω=0的解的存在性.其中Ω是R~n中光滑有界开集。关于非线性项f(x,u)作超线性假设。在此假设下,若f满足增长限制|f(x,u)|≤a|u|°=b,其中a、b、σ是常数.1<σ<(n+2)/(n-2),则利用临界点方法.证明了(*)+b,其中a、b、σ是常数,1<σ<(n+2)/(n-2),则利用临界点方法.证明了(*)有古典解存存。这样不用对(*)的解作先验估计,解决了Figueiredo和Mitidieri在[2]提出的问题。  相似文献   

储层毛细管压力曲线在东海油气储量计算中的应用     

刘申叔  蒲庆南  梁连喜 《上海国土资源》1994,(3)

本文阐述了利用储层毛细管压力曲线计算含油炮和度的方法,该方法在东海油气储量计算中取得良好的结果。  相似文献   

Hydraulics of runoff and loess loam deposition     

J. De Ploey 《地球表面变化过程与地形》1984,9(6):533-539

On many more or less loamy soils, rill erosion is reported to start on slopes that are equal to or steeper than 2–3°; critical Froude numbers for the start of rill wash on these slopes vary between 2·0 and 3·0. This explains why colluvial deposition often occurs on slopes below 2–3°, when water spreads out at the downslope extremities of the rills. The critical hydraulic conditions for loess loam deposition were tested in the laboratory for slopes of 0·5° and 2°, applying unit-discharges (q) up to 10 cm²/s. It appeared from these experiments that for afterflow, without raindrop impact, deposition starts for critical load concentrations (c_cr) varying between several g/1 and about 60 g/l. Under rain c_cr amounts to a minimum value of 100–125 g/l and it increases when the runoff film becomes thinner. Nevertheless, deposition in pluvial runoff is also possible, as was the case during the Weichselian, according to data from quarries in Belgium and in The Netherlands. A modified Kalinske equation is proposed for c_cr prediction, with the introduction of a typical empirical coefficient C_r and considering such factors as shear stress and mean particle size. Massive sedimentation may occur when it stops raining and afterflow starts, since c_cr values are then much lower. It is shown from the Shields' diagram that loamy suspensions are more sensitive to sedimentation than sands in clear water.  相似文献   

均质土坡的安全系数     

徐金明  陈文才 《上海国土资源》1995,(3):43-48

本文用变分法的基本理论的方法，推导出了均质土坡稳定性在平面应变情况下的基本方程，将简单边坡无粘性土（Ｃ＝０）与纯粘性土ψ＝０）的情况作为特例导出了相应的计算方法与计算公式，并对传统的条分法与土坡临界高度计算方法进行了讨论。  相似文献   

地球物理非线性反演模拟退火法的改进   总被引：33，自引：9，他引：33       下载免费PDF全文

姚姚 《地球物理学报》1995,38(5):643-650

在地球物理非线性反演方法中，模拟退火法是一种较先进的启发式蒙特卡洛（ＭｏｎｔｅＣａｒｌｏ）方法．但是，在处理实际资料时，该方法存在着计算效率不够高的缺点，有时还会失效．为此，从模拟退少法的关键问题──最低温度的选择入手，根据模拟退火法与统计力学的吉布斯－马尔柯夫（Ｇｉｂｂｓ－Ｍａｒｋｏｖ）模型之间的关系导出临界温度的近似表达式；用此式分析目标函数超曲面形状对模拟退火法计算的影响；提出利用模糊先验信息确定最低温度、改造目标函数等改进措施．  相似文献   

Multi-phase flow modeling of air sparging   总被引：3，自引：0，他引：3  

M. I. J. van Dijke  S. E. A. T. M. van der Zee  C. J. van Duijn 《Advances in water resources》1995,18(6)

  相似文献   

Landslide triggering scenarios in homogeneous geological contexts: The area surrounding Acri (Calabria, Italy)     

O. Terranova  L. Antronico  G. Gull 《Geomorphology》2007,87(4):250-267

The paper describes a methodology to detect landslide triggering scenarios in geological homogeneous areas and for some specific landslide categories. In these scenarios, the rainfall–landslide relationship as well as the pluviometric load conditions influencing slope instability have to be investigated.The methodology is applied to an area located in northern Calabria (Italy) and affected by widespread and different slope instability phenomena. Outcropped, fractured, and deeply weathered crystalline rock masses, determining geologic homogeneous conditions, are present. In the same area, suitable and homogeneous climatic features have also been found.According to the methodology adopted, the hydrologic analysis of rainfall time-series is initially carried out notwithstanding historical data concerning landslide mobilization, but using simple models to determine critical pluviometric scenarios for the three landslide categories: shallow, medium-deep, and deep. Landslide-triggering scenarios individualized according to this procedure are less significant as compared to the landslide mobilization detected in the study area by means of historical research and ascribed to the three landslide categories according to geomorphologic analysis.Subsequently, the possible landslide triggering scenarios are outlined by carefully investigating the hydrologic analysis limited to the periods identified according to the historical data.In the study area and approximately for all the areas characterized by the outcrop of fractured and deeply weathered crystalline rocks, significant triggering scenarios can be outlined. In particular, shallow landslide triggers could be activated by rainfall events with intensities exceeding 90 mm/day and/or with amounts exceeding 160 mm. As for medium-deep and deep landslides, triggering mechanisms are more complicated; and effective rainfall contribution must be taken into account compared to groundwater storage. Moreover, a more complex link between deep landslides and precipitation is confirmed.The results obtained to date highlight the potential of this methodology, which enables us to define and progressively improve the knowledge framework by means of a work sequence integrating different disciplinary tools and results.  相似文献   

论"单位涌水量就是导水系数"   总被引：2，自引：0，他引：2  

兰太权 《地下水》2007,29(5):43-45,68

单位涌水量是井抽水水位降深换算为1 m时的单井出水量;导水系数是含水层宽度为1 m时,地下水水力坡度为1时的单宽流量.二者之间从定义上看毫无关系,但它们的单位(m3/d·m)(m2/d)是相同的.笔者经过多年探讨和初步试验后发现,单位涌水量就是管井抽水所利用含水层的导水系数.  相似文献   

Capturing critical behaviour in soil moisture spatio-temporal dynamics     

Antonella Di Domenico  Giovanni Laguardia  Mauro Fiorentino 《Advances in water resources》2007

A physical system is subject to a phase transition process when it shows a discontinuous change of a macroscopic feature of the system under a continuous change of a system’s state variable.  相似文献