石家庄市霜冻期的气候异常特征分析   总被引：4，自引：0，他引：4  

杨荣珍  朱伟军  岳艳霞  曹春丽 《气象与减灾研究》2011,34(2):67-70

基于1955-2009年逐日最低气温资料,采用线性倾向估计法和异常霜冻指标,分析了石家庄市霜冻期的年际和年代际气候异常特征.结果表明,从气候平均上来看,石家庄市初霜冻日为11月7日,终霜冻日为3月21日,无霜冻期为230d;石家庄市特早初霜冻发生频率为5%,偏早初霜冻发生频率16%,特晚终霜冻发生频率为4%,偏晚终霜冻...  相似文献   

Sorption of heavy oil onto Jiaozhou Bay sediment     

Cao X  Yang G  Wei S  Han H 《Marine pollution bulletin》2011,62(4):741-746

The sorption of heavy oil onto sediment collected from Jiaozhou Bay was studied in a series of kinetic and equilibrium experiments using NaCl solutions. The effects of temperature, salinity, and pH of the medium on sorption behavior were investigated.Sorption equilibrium of the heavy oil and sediment was established within 60 min. The process was shown to follow a pseudo-second-order kinetic rate model. The sorption rate decreased with increasing initial heavy oil concentration in the solution. Batch equilibrium experiments showed that the sorption isotherm could be described by the Freundlich model. The standard free energy change and enthalpy change at the temperatures studied (283, 288, 293, and 298 K) were negative. These findings indicated that the process was spontaneous and exothermic. Salinity, pH and temperature influenced sorption performance. Sorption was favored by higher concentrations of NaCl, by lower pH values and by lower temperatures.  相似文献   

对加强地震政府网站地震突发事件信息保障工作的思考   总被引：1，自引：0，他引：1  

曹飒  吴敏 《国际地震动态》2011,(9):30-35

地震政府网站是地震行业面向社会宣传防震减灾工作、服务公众的重要窗口.汶川、玉树地震后,地震工作越来越受到社会的关注,地震政府网站已成为社会公众和主流媒体、网站获取地震信息的重要平台,在抗震救灾中发挥着越来越重要的作用.本文通过地震政府网站在汶川、玉树等地震突发事件中信息保障工作的实践,从网站应急制度建设、编制网站应急预...  相似文献   

Background Seismicity and Its Application to Seismic Hazard Assessment in the North China Region     

Wang Hui  Cao Jianling  Shen Xuhui 《中国地震研究》2011,25(4):395-408

The historical earthquake activity is intense in the North China region. However, no middle-sized earthquakes have occurred in the last decades in the region since the MS6.2 earthquake in the Zhangbei region in 1998. The quiescence of moderate and strong earthquakes is quite prominent in North China. In this paper, we use small earthquake records in 1970~2009 to study background seismic activity in the North China region. The spatial distributions of seismic parameters are presented, including b-value, the maximum magnitude and annual occurrence probability of earthquakes of M≥6.0. Our results show regions with low b-value that include the Yuncheng region in the Shanxi rift, the Suqian region located in the Tancheng-Lujiang fault zone and the Shijiazhuang region in the Taihangshan block. Our analysis on the synthetic spatial pattern of seismicity indicate that seismicity in the North China region is mainly affected by the regional dynamic factors of deep structures.  相似文献   

Nutrient sources and composition of recent algal blooms and eutrophication in the northern Jiulong River, Southeast China   总被引：6，自引：0，他引：6  

Li Y  Cao W  Su C  Hong H 《Marine pollution bulletin》2011,63(5-12):249-254

The natural process of eutrophication is accelerated by human activities worldwide that interrupt nutrient biogeochemical cycles. Three algal bloom events have been monitored in the northern tributary of the Jiulong River since 2009. The inflection points in a robust locally-weighted regression analysis (LOESS) of the relationship between TN and TP concentrations in the river water, and a TN:TP comparison with nutrient source loadings, suggested that both external loading and internal nutrient cycling contributed to these algal blooms. Nutrient release from the sediments may have played an important role in regulating the nutrients in the overlying water column. In particular, excessive nutrient inputs from various sources and ubiquitous river damming caused further accumulation of the nutrient loading. In-situ autochthonous primary production was enhanced in this relatively stable "river" to "lake" water body. Thus, attention must be paid to the effects of river damming and the consequent internal nutrient release.  相似文献   

断陷盆地岩性油气藏快速勘探的实用地质-地震相结合配套技术          下载免费PDF全文

王显东  贾承造曹瑞成蒙启安张革张宏王凤来 《地质科学》2011,(4):1132-1144

陆相断陷盆地岩性圈闭目标的快速识别和优选,需要先进地质理论指导与地震技术应用两方面的有机结合。本文通过对塔南凹陷岩性油气藏快速勘探过程中使用的地质理论和地震技术进行总结,建立了一套复杂断陷盆地岩性油气藏快速探明储量规模的实用地质—地震配套技术系列。在岩性油气藏勘探程度不断加深的过程中,综合采用构造分析、层序分析、相带分析和成藏分析等地质分析方法进行指导,配合使用精细构造解释、地震多属性分析、井—震约束下的拟声波波阻抗反演等地震技术,实现岩性圈闭的“定背景、定层系、定区带和定目标”,有效地解决了塔南凹陷岩性油藏勘探中遇到的地质难题,在较短的时间内实现了岩性油藏勘探的突破和基本探明。这一技术系列对同类断陷盆地岩性油气藏的勘探具有重要的借鉴和指导意义。  相似文献   

海拉尔盆地呼和湖凹陷断裂形成演化及其对油气的控制作用          下载免费PDF全文

李军辉  卢双舫  蒙启安  曹瑞成  朱德丰  刘赫 《地质科学》2011,46(4):929-941

断裂的形成及演化对油气的生成、运移和聚集具有重要的控制作用.本文系统分析了呼和湖凹陷断裂形成演化特征对油气成藏条件的控制作用.研究表明,呼和湖凹陷经历了3期构造演化,由下而上分别为:早期伸展断陷期( T5～ T22)、中期裂后热沉降断一坳期(T22-T04)和晚期坳陷期(T04～地表).纵向上主要发育了两套断裂系统,下...  相似文献   

莎车盆地蒸发岩及盐矿物特征初探     

曹养同  焦鹏程  宣之强  刘成林  赵宪福  高超 《化工矿产地质》2011,33(3):137-142

莎车盆地喀什皮拉里剖面岩矿扫描电镜及能谱仪分析表明,大量石膏岩中含有石盐、钙芒硝、杂卤石、天青石、白云石及钾镁硫酸盐组合,说明盆地已达到钾镁盐化学沉积阶段,是成钾找钾重要线索,值得研究关注.  相似文献   

四川九龙县溪谷输变电工程场地稳定性的岩体力学分析     

曹广鹏  李渝生  鲍杰 《地质灾害与环境保护》2011,22(4):46-49

溪谷输变电站工程场地具有较复杂的双层地质结构.岩土体拉分变形明显.场地后缘及底部岩土体的主应力和剪应力集中明显,堆积体内部岩体处于拉分松弛状态.岩土体的潜在变形模式以蠕滑-拉裂为主.在水库蓄水与地震共同作用的极限工况下.场地处于潜在不稳定状态.  相似文献   

非饱和黏性土抗剪强度的温度效应试验研究     

邵玉娴  施斌  顾凯  唐朝生  高磊 《工程地质学报》2011,19(1):137-142

为了系统地了解温度对黏性土工程性质的影响,本文采用南京地区三种不同矿物成分的黏性土,制成不同含水量和干密度的试样,在5～45℃条件下,开展了抗剪强度试验,获得了三种土的非饱和重塑试样的抗剪强度与温度的关系.试验结果表明:黏性土的黏聚力随温度升高呈线性变化;亲水矿物含量较高的黏性土抗剪强度对温度变化较敏感,黏聚力随着温度...  相似文献