山东省地震局防震减灾信息网站管理初探     

梁凯利  张宇隆  孙海龙 《国际地震动态》2000,(11):8-10

探索了防震减灾信息网站管理机构及其职责、网站信息的编审、发布等问题,提出了相应的管理办法。  相似文献   

A feasibility study on navigation in a key sea area of the Northeast Passage of the Arctic based on the Dynamic Bayesian Network          下载免费PDF全文

Shan Yulong  Zhang Ren  Li Ming 《极地研究》1988,31(1):94

  相似文献   

Record-Setting Ocean Warmth Continued in 2019     

Lijing CHENG  John ABRAHAM  Jiang ZHU  Kevin E. TRENBERTH  John FASULLO  Tim BOYER  Ricardo LOCARNINI  Bin ZHANG  Fujiang YU  Liying WAN  Xingrong CHEN  Xiangzhou SONG  Yulong LIU  Michael E. MANN 《大气科学进展》2020,37(2):137-142

Human-emitted greenhouse gases(GHGs)have resulted in a long-term and unequivocal warming of the planet(IPCC,2019).More than 90%of the excess heat is stored within the world's oceans,where it accumulates and causes increases in ocean temperature(Rhein et al.,2013;Abram et al.,2019).  相似文献   

Heat flow measurements on the Lomonosov Ridge, Arctic Ocean     

XIAO Wentao  ZHANG Tao  ZHENG Yulong  GAO Jinyao 《海洋学报(英文版)》2013,32(12):25-30

Heat flow was measured on the Lomonosov Ridge during the 5th Chinese National Arctic Expedition in 2012. To derive the time-temperature curve, resistivity data were transformed to temperature by the resistivity- temperature program. Direct reading and linear regression methods were used to calculate the equilibrium temperature, which were regressed against the depth of the probes in sediment to derive the geothermal gradient. Then, heat flow was calculated as the product of geothermal gradient and thermal conductivity of sediments. The heat flow values on the basis of the two methods were similar （i.e., 67.27 mW/m2 and 63.99 mW/m2, respectively）. The results are consistent with the measurements carried out at adjacent sites. The age of the Lomonosov Ridge predicted by the heat flow-age model was 62 Ma, which is in accordance with the inference that the ridge was separated from Eurasia at about 60 Ma.  相似文献   

Dynamic risk prediction based on discriminant analysis for maize drought disaster   总被引：1，自引：1，他引：0  

Qi Zhang  Jiquan Zhang  Denghua Yan  Yulong Bao 《Natural Hazards》2013,65(3):1275-1284

This study presents a discriminant analysis-based method for prediction of agriculture drought disaster risk. We selected the Chaoyang city in the Northeast China as the study area. We employed multi-scale standard precipitation index (SPI) to reflect drought hazard. We used the yield losses to indicate the drought disaster risk, which was divided into no, low, or high drought risk. We used the multi-scale SPI and drought disaster risk as the input factors for the discriminant analysis-based risk prediction model. The results showed that the model’s prediction accuracy varied between 40 and 82.4 %. The accuracy of high drought disaster risk category was higher than low and no drought disaster risk category. The prediction accuracy of the milky maturity stage was highest. We use leave-one-out cross-validation method to validate the model’s accuracy. And the results showed that the model validation accuracy of high drought group could reach 70.6 % in milky maturity stage. This study showed discriminant analysis is an effective and operable method for disaster risk prediction. This model can provide timely information for decision makers to make effective measures for drought disaster management and to reduce the drought effects to yields at the minimum level.  相似文献   

Dynamic risk assessment of drought disaster for maize based on integrating multi-sources data in the region of the northwest of Liaoning Province, China   总被引：4，自引：1，他引：3  

Xiaojing Liu  Jiquan Zhang  Donglai Ma  Yulong Bao  Zhijun Tong  Xingpeng Liu 《Natural Hazards》2013,65(3):1393-1409

The traditional studies on drought disaster risk were based on the ground point data, which were unable to realize the continuity of space and the timeliness. It is shown that the monitoring and evaluation precision on drought were reduced significantly. However, remote sensing data in adequate spatial and temporal resolution can overcome these limitations. It can better monitor the crop in large area dynamically. This study presents a methodology for dynamic risk analysis and assessment of drought disaster to maize production in the northwest of Liaoning Province based on remote sensing data and GIS from the viewpoints of climatology, geography and disaster science. The model of dynamic risk assessment of drought disaster was established based on risk formation theory of natural disaster, and the expression of risk by integrating data came from sky, ground and space. The risk indexes were divided into four classes by data mining method, and the grade maps of drought disaster risk were drawn by GIS. It is shown that the spatial and temporal risk distributions of maize at each growth stage changed over time. The model has been verified against reduction in maize yield caused by drought. It demonstrated the reasonability, feasibility and reliability of the model and the methodology. The dynamic risk assessment of regional drought disaster for maize can be used as a tool, which can timely monitor the status (the possibility and extent of drought) and trends of regional drought disaster. The results obtained in this study can provide the latest information of regional drought disaster and the decision-making basis of disaster prevention and mitigation for government management and farmers.  相似文献   

云南白锡腊碱性钛铁质辉长岩类与铁氧化物铜金型矿床关系研究     

方维萱  杨新雨  郭茂华  柳玉龙 《大地构造与成矿学》2013,37(2)

云南东川白锡腊铁铜矿段深部碱性钛铁质辉长岩类具有明显的岩相学分带,最新发现的铁氧化物铜金型(IOCG)矿体受碱性钛铁质辉长岩类与隐爆角砾岩相带控制.地球化学研究显示本区碱性钛铁质辉长岩-碱性钛铁质闪长岩具有贫硅、富碱、高磷、富钛铁特征,富集大离子亲石元素(LILE)、稀土元素(REE)及高场强元素(HFSE),与洋岛玄武岩(OIB)类特点一致,具有富铁地幔源区特征.锆石SHRIMP U-Pb年龄揭示它们形成时代为1067 ±20 Ma ～ 1047±15 Ma,揭示了本区碱性钛铁质辉长岩类和铁氧化物铜金型矿床形成时代为中元古代末期,属于格林威尔同造山期形成的产物.推测这种碱性钛铁质辉长岩类的岩浆源区属板内洋岛玄武岩(OIB),地幔流体交代作用导致上涌侵位,这种富铁地幔源区为区域上大规模铁铜金属超量聚集,提供了良好的成矿动力学条件和丰富成矿物质,不但有利于大型-超大型铁氧化物铜金型矿床形成,而且有利于钛铁矿和铜硫化物(铂钯)富集成矿.  相似文献   

白令海Navarinsky海底峡谷地震剖面解译     

肖文涛  郑玉龙  张涛  高金耀 《海洋学报》2014,36(10):61-68

第五次北极科学考察在北极区的白令海首次进行了高分辨率单道地震作业。Navarinsky峡谷头部测线BL11-12剖面中部识别出不对称沙波,陡的一面朝向陆架,波高约为9m、波长约为882m。结合站位U1345的沉积速率及站位U1344表层纵波速率推测沙波沉积可以追溯到中更新世(距今约0.258Ma),同时近陆架的洼地逐渐填平。将地层分为3个沉积层,分析沉积物变化情况,结合0.25Ma以来白令海海平面变化历史,推测最大海退事件对应的界面。结合沙波的地理位置及海平面变化情况,认为内波对沙波的形成起主要作用。  相似文献   

南黄海辐射沙脊群特大潮差分析   总被引：7，自引：1，他引：6  

丁贤荣  康彦彦  茅志兵  孙玉龙  李森  高旋  赵晓旭 《海洋学报》2014,36(11):12-20

根据辐射沙脊群中部条子泥两翼沿海自建的4座潮位遥测站的实测记录,2012年10月17日新条鱼港站观测到了9.39m的特大潮差,不仅证实了20世纪80年代小洋口海域9.28m的潮差记录的可信性,而且刷新了此海域最大潮差记录。基于移动驻潮波和动力地貌理论,本文采用潮位实测分析、二维水动力数值模拟和潮滩地貌遥感解译等方法,阐述了特大潮差的动力成因及其地貌响应机理,提出了条子泥二分水同步潮位跳绳效应,从理论上分析了该海域实测特大潮差的合理性。如若改变最大潮差统计方法,该海域最大潮位差可达9.62m,关于辐射沙脊群对重新认识辐射沙脊群及中国沿海极值潮汐特征更具有创新价值。  相似文献   

北冰洋中心区海冰漂流与大气过程   总被引：3，自引：3，他引：0  

卞林根  王继志  孙玉龙  逯昌贵  林祥  李多 《海洋学报》2014,36(10):48-55

利用北冰洋中心区漂流自动气象站(DAWS)2012年9月—2013年2月的观测数据,分析了北极点周围海冰漂流轨迹和速度及相关大气过程。结果显示,北冰洋中心区海冰具有不稳定漂流过程。2012年9月1日—2013年1月6日,DAWS所在海冰从西向西北方向漂流,2013年1月6日以后稳定地向东南方向漂流,平均移速为0.06m/s,最大达到0.4m/s。海冰漂流方向的突变和加速与穿极气旋和急流的影响有关。净辐射常出现短期突变过程,导致海冰从大气吸收能量,减缓了海冰的辐射冷却。爆发性增温过程的最大幅度达到30℃,是由强穿极气旋和伴随的暖湿气流向北极中心区输送引起,这种现象在中低纬度十分罕见。增温过程的作用是高空大气向冰面输送热量,导致海冰破裂,海冰硬度的脆变,减缓海冰厚度的增长,这种过程可能是北极海冰面积和厚度减少重要过程。  相似文献