黔西南水银洞金矿床矿体数学特征及其勘查意义     

陈林杰  王素平 《地质科技情报》2011,30(6):75-80

水银洞金矿床是黔西南地区著名的特大型微细浸染型金矿床.对矿石品位统计分布特征的分析表明,水银洞金矿床为多次成矿作用叠加的产物.通过矿石品位进行混合总体筛分获得两个单一总体,分别对应两次成矿作用,即沉积成岩期的金预富集和构造-热液期的叠加成矿,其中后者成矿强度大但不均匀,前者成矿强度小但较均匀.对矿体自相关特征的变异函数模拟结果表明,对该矿床进行勘探时可采用沿矿体走向和倾向方向布置的矩形勘探网,提出今后矿山和外围的勘探可以使用比目前网矩更宽的网距,即75 m×190 m网距来控制矿体,这将大大降低勘探成本.矿石品位的趋势面分析结果表明,随着标高的降低,即往深部方向矿石品位的平均值和变化系数均呈现明显的下降趋势,说明往深部矿化强度减小,而矿化变得较均匀.结合矿区目前的勘探情况和趋势面分析结果,认为灰家堡背斜的北翼是矿区及其外围进一步找矿的重点区域.  相似文献   

四川省都江堰龙池8·13麻柳沟泥石流灾害特征   总被引：2，自引：0，他引：2  

亓星  余斌  马煜  吴雨夫  张健楠 《中国地质灾害与防治学报》2011,22(1):17-21

麻柳沟位于都江堰市龙池镇龙溪河右岸,＂5.12＂地震后麻柳沟流域内产生了大量的崩滑体,物源丰富。2010年8月13日,在强降雨作用下该沟暴发中等规模的泥石流,沟口堆积体积达8×104 m3,损毁了沟口处3户居民的房屋,并於埋了龙池景区公路。本文通过麻柳沟的实地调查取样和洪痕断面测定,分析了麻柳沟泥石流的形成条件和基本特点,并通过计算泥石流的容重、流速、流量等静动力学特征参数,对该泥石流沟的发展趋势进行预测。  相似文献   

安康地区降水变化特征及趋势分析     

臧金丹  张阳生 《地下水》2011,33(2):176-178

根据安康地区48年气象中的降水资料,采用线性回归法、累积距平法,以及5年滑动平均曲线研究方法,对安康地区48年降水变化从年、季、月的时间角度进行了比较,从而分析了安康地区降水变化特征及规律.结果表明,安康地区48年来,降水呈缓慢减少趋势,但21世纪后降水将呈现略微增加趋势,降水主要集中在夏季、春秋两季降水呈减少趋势,夏...  相似文献   

Features of aerosol optical depth and its relation to extreme temperatures in China during 1980-2001     

HU Ting  SUN Zhaobo  LI Zhaoxin 《海洋学报(英文版)》2011,(2):33-45

Based on Total Ozone Mapping Spectrometer (TOMS) monthly aerosol optical thickness (AOT) measurements in 1980–2001 a study is made of space/time patterns and difference between land and sea of AOT 0.50 μm thick over China,which are put into correlation analysis with synchronous extreme temperature indices (warm/cold day and night).Results suggest that 1) the long-term mean AOT over China is characterized by typical geography,with pronounced land-sea contrast.And AOT has significant seasonality and its seaso...  相似文献   

Temperature variations at the Great Wall and Zhongshan stations     

BIAN LinGen  MA YongFeng  LU ChangGui  LU LongHua 《极地研究(英文版)》2011,22(1):42-48

Surface meteorological observations have been carried out at the Great Wall station (GW) and Zhongshan station (ZS) from 1984 to 2008 and from 1989 to 2008 respectively. The variation in mean air temperature and its trends are derived from the meteorological observation data recorded at both stations. The warming rate of the annual mean temperature at GW is similar to that at Bellingshausen station, which is about 3 km distant. Thus, the warming trend is representative of the King George Island region. The warming rate of ZS is less different from that at Davis station,which is about 100 km from ZS. It can be said that the meteorological data recorded at both stations are representative of the regions of the King George Island and east coast of the Antarctic.  相似文献   

Sea Surface Temperature Extremes of Different Intensity in the China Seas During the Global Warming Acceleration and Hiatus Periods     

王庆元  李琰  李清泉  王彦 《热带气象学报(英文版)》2020,26(4):473-482

Based on the daily OISST V2 with 0.25o horizontal resolutions, we study the variations of sea surface temperature (SST) extremes in the China Seas for different segments of the period 1982-2013. The two segments include the warming acceleration period from 1982 to 1997 and hiatus period from 1998 to 2013 when the global surface mean temperature (GSMT) was not significantly warming as expected during the past decades, or even cooling in some areas. First, we construct the regional average time series over the entire China Seas (15o–45oN, 105o–130oE) for these SST extremes. During the hiatus period, the regionally averaged 10th, 1th and 0.1th percentile of SSTs in each year decreased significantly by 0.40°C, 0.56°C and 0.58°C per decade, respectively. The regionally averaged 90th, 99th and 99.9th percentile of SSTs in each year decreased slightly or insignificantly. Our work confirmed that the regional hiatus was primarily reflected by wintertime cold extremes. Spatially, the trends of cold extremes in different intensity were non-uniformly distributed. Cold extremes in the near-shore areas are much more sensitivity to the global warming hiatus. Hot extremes trends exhibited non-significant tendency in the China Seas during the hiatus period. In word, the variations of the SST extremes in the two periods were non-uniform spatially and asymmetric seasonally. It is unexpected that the hot and cold extremes of each year in 1998–2013 were still higher than those extremes in 1982–1997. It is obvious that relative to the warming acceleration period, hot extremes are far more likely to occur in the recent hiatus as a result of a 0.3°C warmer shift in the mean temperature distribution. Moreover, hot extremes in the China Seas will be sustained or amplified with the end of warming hiatus and the continuous anthropogenic warming.  相似文献   

Recent trends of temperature change under hot and cold desert climates: Comparing the Sahara (Libya) and Central Asia (Xinjiang, China)     

B. Mamtimin  A.M.M. Et-TantawiD. Schaefer  F.X. Meixner  M. Domroes 《Journal of Arid Environments》2011,75(11):1105-1113

According to trend computations at three stations each in Sahara desert (Libya), characterized by a “hot” desert type (“BWh”, according to the Koeppen climate classification), and in Central Asia (Xinjiang, China) identified as a “cold” desert type (“BWk”, after Koeppen), increasing annual temperatures were detected over the period 1955-2005 corresponding with global temperature warming. From 1955-1978, negative (decreasing) temperature trends were, however, observed at all three hot desert stations and at two of the three cold desert stations. From 1979-2005, strikingly positive temperature trends were seen at all six stations. In seasonal respects, winter (December to February) and summer (June to August) show different temperature trends over the period 1955-2005: the hot desert experienced an increasing temperature trend at a greater extent in summer than in winter; vice-versa, in the cold desert positive trends were computed for winter and negative for summer. It can also be observed that mostly hot desert warming occurred in summer, opposite to cold desert warming in winter.  相似文献   

我国土地利用研究的发展态势与重点领域   总被引：19，自引：3，他引：16  

陈百明  张凤荣 《地理研究》2011,30(1):1-9

进入21世纪以来,土地利用研究在与土地管理实践的密切结合中扩展了学术影响,提高了学科地位.在土地利用的调查与监测、综合属性评价、规划与设计、变化与机制、工程与技术等方面取得长足的进展.基于发展态势的分析,本文提出应加强土地利用的基础理论研究、重视土地利用的方法体系研究、拓展土地利用的研究视角和深化研究内涵、强化土地利用...  相似文献   

我国入境旅游客源与旅游外汇收入的多尺度对比研究——EMD方法的新应用     

陈玲玲  杨慧 《地域研究与开发》2011,30(6):94-97

基于2005—2010年间我国入境旅游客源和旅游外汇收入的月数据,引入处理非平稳时间序列的经验模态分解(EMD)方法,进行两个要素的多尺度分解及对比。研究结果表明:(1)入境旅游客源与旅游外汇收入具有几乎一致的波动周期,分别为3个月、半年、1年及39个月。(2)入境旅游客源并不是旅游外汇收入变化的必要条件。如果外界条件不变,入境旅游客源的变化趋势以3个月周期震荡为主,上升速度极为缓慢;而旅游外汇收入则保持迅速提升,周期性波动并非其主要变化特征。(3)比起盲目吸引入境旅游客源,更应根据区域旅游资源特点与发展基础,寻找旅游业发展中新的增长点,才更具长远意义。  相似文献   

近50年山西高温日的时空分布及环流特征   总被引：6，自引：0，他引：6  

苗爱梅  贾利冬  李苗  范光海 《地理科学进展》2011,30(7):837-845

利用1958-2008 年高低空气象观测资料以及山西省气象信息中心归档的109 站原始气象记录月报表及其信息化产品资料,分别以最高气温≥35℃、≥37℃、≥40℃为指标, 研究山西高温日的时空分布、变化趋势及环流特征,结果表明：①山西高温日最早出现在4 月中旬,最晚出现在9 月中旬,≥35℃、≥37℃和≥40℃的高温日均是6月下旬最多。②高温日数具有随纬度、随海拔的升高而减少,西部多于东部、南部多于北部、盆地多于山区的空间分布特征。≥40℃的高温区域主要集中在运城和临汾地区。③1984-2008 年,35℃以上的高温日数整体呈上升趋势;1979-2008 年,30a 间高温站次以153 站次/10a 的趋势增多;进入90 年代以后,不仅高温日数增多,而且高温持续时间、强度、范围都有增强趋势。④影响山西高温的500 hPa 环流形势主要有：副高纬向性、副高经向型以及大陆高压（脊）控制型3 类。在特定的流型配置下,T850≥25℃、T700≥13℃,T850≥26℃、T700≥14℃,T850≥28℃、T700≥15℃,T850≥32℃、T700≥16℃是山西省不同区域、不同风向影响时,≥35℃、≥37℃、≥40℃高温天气预报的临界值。  相似文献