河南省国土资源科学研究院隆重集会庆祝建院50周年     

左金安  高鹏 《河南地质》2009,(9):F0002-F0002

彩旗飘飘、锣鼓喧天。9月9日,伴着金秋丰收的喜悦,河南省国土资源科学研究院举行隆重的庆典活动．庆祝建院50周年。来自省国土资源厅、厅机关各处室和厅属单位．中国地质大学等院校及省内有关协会学会、各地勘单位、兄弟省科研所等单位的220余位嘉宾参加了庆典活动。  相似文献   

某防渗帷幕高压旋喷桩试桩分析与探讨     

杜常春  张宁 《岩土工程技术》2009,23(4):193-196

在温州某垃圾填埋场水文地质与工程地质条件的基础上,对于有地下水渗流的砂层中,高压旋喷注浆单管法与三重管法试桩进行了对比试验与分析,高压旋喷注浆成桩效果及影响因素进行了探讨,供同类工程设计与施工提供参考.  相似文献   

大荔县地下水环境质量评价及成因浅析   总被引：2，自引：1，他引：1  

刘瑞平  朱桦  亢明仲  焦建刚  杨柄超  乔刚  赵阿宁  柯海玲 《西北地质》2009,42(2):116-125

基于2006－2007年对研究区野外实地调研和水化学数据的测试分析,以国家地下水质量I类水标准为基值,筛选出12个超标的水化学组分,利用模糊灰色评价方法对地下水环境质量作出评价。结果表明,大荔县地下水绝大部分为5类水．并用熵权赋权法研究导致水质变差的主要水化学组分。结果表明,铁在该区影响最大,其次为氯化物、总硬度、氟化物、溶解性总固体,为苦咸水之源。含水层中铁、总硬度、溶鹪性总固体、硫酸根、卤化物区域性高含量主要由于大荔县特殊的气候、地质背景条件等所决定。而COD、硝酸盐、亚硝酸盐、锰、铬含量的增高由人类活动所为。  相似文献   

南黄海某典型剖面重磁震联合反演及综合解释   总被引：2，自引：1，他引：1  

林珍  姚永坚 《物探与化探》2009,33(4)

以航磁资料为主、结合其他地学信息,在南黄海海域选取具有典型性与代表性剖面,进行重磁震联合反演、综合地质地球物理解释,分析南黄海海域磁性基底性质、岩相结构和断裂构造特征,为进一步开展油气勘查、实现油气突破提供科学依据.  相似文献   

Effects of copper pollution on the activity of soil invertase and urease in loquat orchards   总被引：1，自引：0，他引：1  

Lijun Fu  Wenjin Yang  Yangye Wei 《中国地球化学学报》2009,28(1):76-80

Dealt with in this paper is the relationship between Cu contents of soil and activity parameters for soil invertase and urease from the Changtai loquat orchards in Fujian Province. The soil invertase activity and maximum reaction velocity (enzyme kinetic parameters: Vmax and Vmax/Km) have no remarkable negative correlation with Cu concentrations, but Cu concentrations have an obvious positive effect on invertase Kin, indicating a reversible com-petitive restraint on the reaction between Cu and invertase. The soil urease activity and maximum reaction velocity (Vmax,Vmax/Km) have a remarkable negative correlation with Cu concentrations, and in this aspect, they can be used as ecological indices of the soil polluted by Cu. A slightly variable Km indicates the non-reversible competitive restraint level.  相似文献   

基于数值模拟和统计拟合分析华北冬季一次大范围重污染过程的形成机理     

秦楚菲  孙家仁  张文君  廖志恒  滕宇威  陈朋龙  陈静华 《气候与环境研究》2020,25(2):185-198

基于WRF/Chem（Weather Research Forecasting/Chemistry）模式对2015年11月25日至12月2日我国北方一次大范围PM2.5（空气动力学当量直径小于等于2.5 μm的颗粒物,即细颗粒物）重污染过程进行了模拟。与观测资料对比表明,模式能够较好地模拟出PM2.5浓度及气象因素的变化趋势,结果适用于此次污染事件的机理分析。动力、热力条件及化学转化等因素对此次强污染事件形成的机理分析表明,动力因子主要通过表面风和垂直风切变的减弱对此次污染事件造成影响,边界层逆温等热力因子促进了大气稳定性的增强,不利于污染物扩散。依据PM2.5组成成分变化分析可知,硝酸盐、硫酸盐和有机碳在此次事件中含量增加,说明机动车汽车尾气和燃煤排放所致的二次气溶胶生成对PM2.5污染加剧起重要贡献。多元线性回归分析和多因子相对贡献率量化解析结果表明,热力因子在此次污染过程中起主要作用,方差贡献率为52%,动力因子次之,方差贡献率为34%,而化学转化方差贡献率约为14%,说明气象条件,尤其是热力条件是引起此次污染事件的主要原因。  相似文献   

关中地区大气污染特征分析          下载免费PDF全文

魏俊涛  杨晓春  杜萌萌  白庆梅  白水成 《陕西气象》2022,(1):53-58

基于2014-2018年关中区域西安、咸阳、渭南、铜川、宝鸡等5个主要城市6种大气污染物(PM10、PM2.5、SO2、CO、NO2、O3)的逐日平均质量浓度和气象探空资料,分析了关中地区大气污染物时空分布特征、重污染过程持续性特征及逆温发生频率.结果表明:关中地区大气污染超标日达31％以上,西安最多为47％,其中颗粒...  相似文献   

Spatial correlations between urbanization and river water pollution in the heavily polluted area of Taihu Lake Basin, China     

赵海霞  段学军  Becky STEWART  尤本胜  蒋晓威 《地理学报(英文版)》2013,23(4):735-752

Water pollution in the Taihu Lake Basin has been the focus of attention in China and abroad for a long time, due to its position in the forefront of urban development in China. Based on data gathering and processing from 84 monitoring sections in this heavily polluted area, this study first analyzes spatial patterns of urbanization and the distribution of river water pollution, and then uses the GeoDa bivariate spatial autocorrelation model to investigate the spatial correlation between urbanization and river water pollution at the scale of township units. The results show that urbanization has adverse impacts on water pollution, and the influence varies in different levels of development areas. The urban township units have the highest level of urbanization and highest pollution, but the best water quality; the suburban units have lower level of urbanization, but higher pollution and worse water quality; however the rural units have the lowest level of urbanization and lowest pollution, mainly affected by upstream pollution, but worst water quality. Lastly, urban and rural planning committees, while actively promoting the process of development in the region, should gradually resolve the issue of pollution control lagging behind urban life and urban develop- ment, giving priority to construction of centralized sewage treatment facilities and associated pipeline network coverage in the rural areas and suburban areas.  相似文献   

镉米之痛     

刘焕启 《地球》2013,(6)

正"民以食为天,国以粮为本。"我国有7000年有水稻种植历史,是世界上水稻品种最早有文字记录的国家。在我国南方,大米一直是长江流域及其以南地区人民的主粮。然而,就是这种每天饭桌必不可少的主食,最近却被曝出安全隐忧,被推到舆论的风头浪尖。5月16日,广州市食品药品监管  相似文献   

Geochemistry of the High Dam Lake sediments,south Egypt： implications for environmental significance     

Mohamed Abdallah  Gad DARWISH 《国际泥沙研究》2013,28(4):544-559

The goal of the present work is to perform a geochemical assessment of High Dam Lake bottom sediments for determining the fate, dispersion and levels of trace elements causing environmental pollution, and provided an access to their probable sources. The sediment samples were analyzed using ICP-MS for 20 elements; Ag, Ba, Cr, Cu, Ga, Hf, Mn, Pb, Rb, Sc, Se, Sn, Sr, Ta Th Ti, T1, U, V and Zr, and their obtained data were treated using statistical, graphical and mapping techniques. The results showed the data set of all analyzed elements affected by outliers and extreme values that caused deviation away from normality. Kruskal-Wallis test revealed that median of some trace element levels in Lake sediments, was not significantly different and other elements rejected the Null hypothesis. Most analyzed elements had high values of median and mean in sediments of Lake Nubia rather than Lake Nasser and their normalization gave the same results of calculated environment factors. Subsequently, Lake Nubia sediments possessed high combined EF levels ofTh, Sc, Sn, Ag, Zr, Hf, Ta, Sr, U, Ti, V, Cr, and Mn, causing significant contamination, which was great potentially related to industrial, agricultural, urbanization and mining activities. Whereas, combined EF of Se, Cu, Ga, Pb, Ba, Rb, and Tl, which are highly elevated in southern Lake Nasser sediments owing to their source are great possibly derived from Lake Nubia and geogenic activities. With decreasing distance towards the High Dam body, the contaminant elements were diminished due to reduction in the environmental factors and Sudanese pollution sources leading to the northern Lake Nasser considered to be less contaminated. Overall, the present study is an environmental alert for contaminated sediments that carried contaminants and considered the secondary source of pollution impact on ecosystem, and subsequently, their environmental risk on Human health.  相似文献