Typhoon disaster in China: prediction,prevention, and mitigation   总被引：4，自引：1，他引：3  

Defu Liu  Liang Pang  Botao Xie 《Natural Hazards》2009,49(3):421-436

Typhoon-induced disaster is one of the most important factors influencing the economic development and more than 250 million in China. In view of the existing state of typhoon disaster prediction, prevention, and mitigation, this paper proposes a new probability model, Multivariate Compound Extreme Value Distribution (MCEVD), to predict typhoon-induced extreme disaster events. This model establishes prevention criteria for coastal areas, offshore structures, and estuarine cities, and provides an appropriate mitigation scheme for disaster risk management and decision-making.  相似文献   

鲁西南地区土壤中有机氯农药的残留及其分布特征   总被引：11，自引：0，他引：11  

庞绪贵  张帆  王红晋  胡雪平  曾宪东 《地质通报》2009,28(5):667-670

在鲁西南地区1.08×104km2的范围内以1点/36km2的采样密度采集表层土壤299件,测试六六六（HCH）、滴滴涕（DDT）等10项指标。研究这些指标的含量变化,发现区内土壤中停用20多年的六六六（HCH）、滴滴涕（DDT）仍有较高的检出率。土壤中六六六（HCH）4种异构体β-HCH含量最高, P,P′-DDE和P,P′-DDD为滴滴涕（DDT）的主要存在形式;进一步研究α-HCH／γ-HCH、β-HCH／γ-HCH和（P,P′-DDE＋P,P′-DDD）/P, P′-DDT值的变化规律,得出调查区内仅滴滴涕（DDT）在局部可能存在新的污染源输入,而大部分地段六六六（HCH）、滴滴涕（DDT）农药使用时间较长,其组分已经通过物理、化学等作用发生了很大变化,污染是过去形成的。土壤环境质量评价结果表明区内土壤质量能保障农业生产、维护人体健康。  相似文献   

Filling History and Post-Breakup Acceleration of Sedimentation in Baiyun Sag,Deepwater Northern South China Sea     

Zhou Di  Sun Zhen  Liao Jie  Zhao Zhongxian  He Min  Wu Xiangjie  Pang Xiong 《中国地质大学学报(英文版)》2009,20(1)

The Baiyun (白云) sag in the southern Pearl River Mouth basin is the largest and deepest sag in deepwater northern South China Sea.Researches and exploration in this sag have revealed many distinct features of the sag.This article reports its filling history through backstripping of depth data of interpreted sequence boundaries.Maps of sediment rates of 10 sequences from 49 Ma to the present were constructed,showing the spatio-temporal variation of the sediment rate.Three stages of sediment infilling,49-17.5 Ma,17.5-10.5 Ma,and 10.5-0 Mn,were divided by abrupt changes of sedimentary patterns.If the breakup of the South China Sea took place at ～30 Mn,significant pint-breakup acceleration of sedimentation was observed at 17.5-15.5 Ma and 13.8-12.5 Mn,indicating acceleration of subsidence at these times.We propose that the onset of strong post-breakup snbsidence at ～17.5 Ma was an important tectonic event that changed the pattern of sedimentation from discrete and medium-rate depmition centers in both main and south snbsags to restricted but high-rate deposition in the main snbsag.The cause and implications of this newly recognized event need tobe investigated.  相似文献   

广西靖西县岜爱山矿区优质锰矿地质特征及找矿方向     

庞清媛  冯松青  蒙永励 《化工矿产地质》2009,31(4):213-221

广西靖西县岜爱山矿区锰矿层赋存于泥盆系上统五指山组中段条带状、薄层状硅质泥岩或硅质灰岩中,深部为原生碳酸锰矿,地表及浅部为次生氧化锰矿。矿区内矿体主要受安宁背斜、品明向斜的控制,矿层产状稳定,厚度变化不大,连续性好,矿床成因类型为＂下雷式＂＂沉积变质型锰矿床＂。  相似文献   

基于气候统计特征的雷达回波质控方法     

王国荣  平凡  仰美霖  庞琦烨 《气象科技》2019,47(1):19-28

利用北京南郊S波段雷达2011—2016年的观测资料,从雷达气候统计的角度,利用不同强度回波发生频率的统计特征及其空间分布特征,对雷达地物杂波和波束遮挡的识别与订正方法进行研究。结果表明:①利用雷达回波出现频率特征,可以很好地识别雷达近中心地物杂波和受地形高度影响的地物杂波特征;同时还可以直观地识别出雷达波束遮挡区域以及遮挡程度。北京南郊雷达地物杂波主要分布在近雷达中心和北京西部、西北部的山前地区,地物杂波主要集中在0.5°仰角和1.5°仰角层上。雷达波束遮挡主要集中在由高大建筑引起遮挡的东南方位向和由于地形引起波束遮挡的西西北方位向,波束遮挡主要集中在0.5°仰角层。②采用局部可变区域平均垂直廓线方法利用高仰角回波订正低仰角回波,能有效订正地物杂波,并保留回波的局部特征。对于波束遮挡区域的回波填补,也能够较好地保持上下层仰角回波之间的连续性,同时兼顾了回波不均性分布等特性。③基于雷达气候特征进行地物杂波识别和波束遮挡识别,无需依照先验知识,相比于传统方法能更好地反映本地雷达回波真实情况,且具有方法简单、可快速复用、本地适用性强等优点。  相似文献   

高密度电法在王家坡滑坡体中的应用     

庞日轩  刘铁铭  李西周  田靖  杨帅  赵峰 《陕西地质》2019,(1):79-85

通过高密度电阻率成像探测法,在王家坡滑坡体勘察中建立了滑坡体地质特征—电性特征解释模型,查明了滑坡体的空间特征,并根据实际情况,推断了新的滑坡体位置,认为现存滑坡体中部及前缘存在潜在的次级滑体,后期可能会出现滑坡前缘前移。  相似文献   

青海都兰沟里金矿整装勘查区1:100 000地质矿产数据集          下载免费PDF全文

周红智  徐崇文  张松涛  张里斌  张新铭 《中国地质》2019,46(S1):93-104

青海都兰沟里金矿整装勘查区1：100 000地质矿产数据集由系统库、建造构造图、地质矿产图、地磁ΔT平面等值线图、地磁ΔT化极平面等值线图、化探综合异常图、矿产预测成果图及附表组成;每张图文件夹内有对应的编图说明。沟里整装勘查区总体被新元古代-早古生代东昆中缝合带（Pt₃-P₂末）、中-晚古生代兴海-苦海缝合带（D-P₃）、晚古生代-早中生代（C-T₂末）阿尼玛卿缝合带分割为4个二级构造单元。区内岩浆活动以奥陶纪-泥盆纪和二叠纪-三叠纪为主,分别代表了两期不同的造山旋回,成矿期可能在晚三叠世-早侏罗世。此次工作在整装勘查区内共圈定了1：50 000磁异常21处、化探综合异常80处;划分4个三级成矿带（区）、7个四级成矿亚带、8个五级矿带（矿田）、17个六级有利找矿区块;在有利找矿区块中筛选并提交找矿靶区14处;通过后续投入,区内相继发现了那更康切尔大型银矿、德龙金矿、迈龙金矿点、浪木日铜镍矿点、龙什更铜钴矿点等一批有找矿潜力的矿床（点）;估算区内金资源总量588.04吨、银资源总量3 197.85吨、铅-锌资源总量235.83万吨,铜-钴资源总量121.49万吨。  相似文献   

First Results of Dating Detrital Zircons from the Late Precambrian Quartzite–Schist Sequences of the Chu Block (Southern Kazakhstan)     

Kanygina  N. A.  Tretyakov  A. A.  Degtyarev  K. E.  Pang  K.-N.  Wahg  K. L.  Lee  H.-Y.  Plotkina  J. V. 《Doklady Earth Sciences》2019,489(1):1273-1276

Doklady Earth Sciences - U–Pb geochronological studies of detrital zircons from quartzite–schist sequences of the Akbastau Formation of the Chu Block (northwestern part of the...  相似文献   

Lake evolution and its implication for environmental changes in China during 1950–2000     

Zhihua Huang  Bin Xue  Shuchun Yao  Yong Pang 《地理学报(英文版)》2008,18(2):131-141

Lakes in China have undergone considerable environmental changes during the past 50 years, e.g. lake level, water area changes, as did in the past several thousands years. The enhanced human activities, such as land reclamation, application of chemical fertilizer, land use and cover, irrigation and industrialization in the catchment etc., have played an important role on the recent decades＇ changes of these lakes, although constrained to a great extent by the natural impact. Comparative study on variations of lake volume （water level, depth and area） in the eastern and western lake regions of China during 1950-2000 indicated that, lake volume in the eastern region had approximately undergone a two-stage change, i.e. a dramatic decrease from the 1950s to 1970s, and a continuous increase between the 1980s and 1990s; while, in the western region, lake volume had been decreasing nearly all the time. Further studies on some typical lakes concluded that, climatic change was a primary factor for the variations of lake volume during the past 50 years, although human activities showed important effect.  相似文献   

塔里木盆地塔中地区Ⅰ号断裂带上奥陶统良里塔格组储集层类型及有利区带预测^*   总被引：3，自引：0，他引：3       下载免费PDF全文

刘洛夫  李燕  王萍  陈治军  王维斌  庞雄奇  姜振学  向才富  杨海军  韩剑发 《古地理学报》2008,10(3):221-230

塔里木盆地塔中地区Ⅰ号断裂带上奥陶统良里塔格组为目前国内较典型的碳酸盐岩油气储集层,且有巨大的勘探潜力,深入研究该套储集层的类型及分布对塔中地区的下一步勘探将具有重要的指导意义。通过大量岩心分析,根据孔隙度—渗透率相关关系将塔中地区Ⅰ号断裂带上奥陶统良里塔格组碳酸盐岩储集层划分为3 种主要类型：孔隙型、裂缝型、裂缝—孔隙型。根据各单井储集层类型,结合沉积相及断裂等储集层影响因素,推断了良里塔格组3个岩性段的不同类型储集层的分布范围,认为裂缝型储集层最为发育,而最有利于油气成藏的裂缝—孔隙型储集层主要发育于良二段,孔隙型储集层分布范围较小。最后认为塔中Ⅰ号断裂带塔中82井区—塔中24井区为油气勘探最有利区。  相似文献