Earth fissures in Jiangsu Province,China and geological investigation of Hetang earth fissure   总被引：1，自引：0，他引：1  

G. Y. Wang  G. You  B. Shi  Z. L. Qiu  H. Y. Li  M. Tuck 《Environmental Earth Sciences》2010,60(1):35-43

Earth fissures are a geohazard in Jiangsu Province, China. They can be caused by earthquakes and active faults, underground mining, groundwater extraction and landslides. In order to establish a provincial rehabilitation plan in Jiangsu, a range of monitoring programs, surveys, geological investigations and modeling have been implemented or planned. One of the focuses of the project is the land subsidence and earth fissures caused by excessive groundwater withdrawal in Suzhou, Wuxi and Changzhou (Su-Xi-Chang) area, southern Jiangsu Province. Hetang earth fissure within the Su-Xi-Chang area was first reported in 1995 and a series of investigation has been conducted since then. The site investigations and geophysical survey in 1997 have recognized the causative factor as the excessive groundwater drawdown coupled by the underlying bedrock ridge. An open trench excavation in 2007 and a plane strain analysis suggest that Hetang earth fissures may have cracked from the bedrock ridge to ground surface. Geological drilling in 2007 has further confirmed the existence and configuration of the ridge and extracted soil samples for laboratory tests to obtain soil parameters for numerical analyses and modeling of land subsidence and earth fissures in the Su-Xi-Chang area, Jiangsu, China. The laboratory tests are currently in progress and the result of numerical analyses and modeling is expected to be presented in the near future.  相似文献   

Analysis and study on the influence of polarization potential in measuring geoelectric field     

Xi Jilou  Qiu Ying  Liu Chao  Han Runquan  Xu Xuegong  Shang Xianqi 《地震地磁观测与研究》2008,29(6)

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浅析飑天气现象的观测记录     

仇巧玲 《内蒙古气象》2013,(4):35-36

文章从统计临河地区(1981—2010年)30a历史资料着手,对出现的20次飑的特征进行了详细分析,并通过典型例子进一步的举例论证,又结合自己多年的观测审核经验,提出了飑的观测记录要点,供地面气象观测员在今后的工作中参考,从而防止飑的误记、漏记。  相似文献   

气象远程教育流媒体课件录制系统的开发和应用     

齐丽君  刘涛  仇巧灵 《内蒙古气象》2013,(6):42-44

网络教育的高速发展,使网络课件成为课件制作系统的发展方向,而且开发一个和网络教学系统高度集成的课件制作系统也成为必然的趋势。中国气象局培训中心内蒙古气象远程教育二级站已于2007年年初落成并投入使用。硬件设备已达到建设标准,软环境还处于空白。因此,急需投入一定的人力和财力进一步开发与硬件相适应的课件录制和课件点播系统。这对于我区气象系统远程教育的发展十分必要。  相似文献   

春玉米产量动态预报技术的改进方法探索     

邱美娟  刘布春  刘园  张玥滢  肖楠舒  庞静漪  王珂依  王丽伟 《气象与环境科学》2020,43(1):1-8

为及时、准确地进行玉米产量预报,为吉林省玉米产量预报业务提供参考依据,为政府调控提供科技支撑,利用吉林省19802016年春玉米产量和50个气象站逐日气温、降水量、日照时数等资料,基于相似距离和相关系数构建综合诊断指标筛选气温、降水量、日照时数等各类气象要素历史相似年,根据各类气象要素历史相似年与预报年的玉米产量丰歉气象影响指数之间的关系,建立吉林省春玉米产量动态预报模型。同时,对历史相似年的筛选方法进行改进,利用欧氏距离直接筛选综合气候历史相似年,根据气候历史相似年与预报年的玉米产量丰歉气象影响指数之间的关系,构建春玉米产量预报模型。对比改进前、后的产量预报模型的预报,结果表明:两种方法在吉林省玉米单产预报中,预报准确率均较高,普遍在85%以上。产量预报模型对20022013年的预报检验结果表明,改进方法后20022013年单产预报平均准确率提高了3.9个百分点,均方根误差降低了4个百分点,标准差降低了2。对20142016年的预报检验结果表明,改进方法的玉米产量预报结果优于传统方法的预报结果。改进方法比传统方法准确率更高,稳定性更强,应用价值更高。  相似文献   

高有机质输入对底栖有孔虫的抑制作用——以西北太平洋菲律宾海MD06-3054孔为例   总被引：1，自引：1，他引：0  

陈双喜  南青云  李铁刚  唐正  仇晓华 《第四纪研究》2011,31(2)

底栖有孔虫古生产力指标-底栖有孔虫堆积速率(Benthic Foraminifera Accumulation Rate,简称BFAR)和小泡虫超科的Uvigerina与Bulimina两属在种群中的百分含量(简称"U+B含量")是目前古海洋学研究的常用方法.然而,从MD06-3054孔的记录中发现,两指标与有机质输入之间不仅不存在很好的线性关系.而且当有机质输入大于阀值时,两指标均随沉积物中总有机碳(Total Organic Carbon,简称TOC)含量的增加而明显地降低,说明过高有机质的输入还会抑制底栖有孔虫的生长和繁盛.另外,还发现当TOC含量较高时,U+B含量指标较BFAR指标相对更适用.  相似文献   

塔里木盆地北缘上石炭统砂岩碎屑组分及其对物源类型和构造属性的指示          下载免费PDF全文

杨栋栋  李双应  王松  万秋  赵大千  徐锦龙 《岩石矿物学杂志》2011,30(4):645-653

南天山在晚古生代以来经历的一系列碰撞和微板块的拼合事件在塔里木盆地北缘的沉积作用和构造演化中都有明显的反映,而沉积物物源分析是认识盆地演化、解释构造背景的重要途径和方法。根据对塔里木盆地北缘地区多个剖面的研究,上石炭统阿依里河组砂岩碎屑组分以石英为主,其次是长石及各种岩屑,有时含有机质杂基及云母。其中石英平均含量为70.7%(53%～86%),长石平均含量7.1%(5%～17%),岩屑平均含量为22.5%(20%～30%)。物源分析结果表明,砂岩物源主要来自再旋回造山带,并且主要具俯冲消减的缝合带和碰撞造山属性,少量具弧造山属性。结合塔里木北缘晚石炭世的岩相古地理特征,认为物源可能来自于北侧的古天山造山带。  相似文献   

塔里木盆地腹地玛扎塔格山隆升时限探讨及其环境意义   总被引：2，自引：2，他引：0  

裴军令  李海兵  孙知明  司家亮  邱祝礼  潘家伟  赵越  任晓娟 《岩石学报》2011,27(1):333-343

位于塔里木盆地腹地(N38°40.911', E80°18.484') 的玛扎塔格褶断带东西向延伸约300km,南缘发育出露连续、完全的早更新世地层,岩性主要以灰黄色泥岩、粉砂质泥岩为主。本文以其中出露完全的一段河湖相泥岩、粉砂岩为研究对象,共采集古地磁样品130块16个采点。通过岩石磁学研究,说明主要载磁矿物是磁铁矿,107块样品的磁化率各向异性结果显示地层校正后其最小轴近直立,并且磁面理较磁线理发育,具有沉积组构特征。地层校正后磁化率各向异性最大轴的方向指示了早更新世时研究区域NWW-SEE的古流向。系统热退磁结果揭示出了正反极性,高分辨率的磁性地层学研究限定研究剖面时代约为1.3~0.9Ma。从而推测玛扎塔格剖面中第四纪地层记录的最近一次构造活动时间约为0.8Ma,即早更新世末中更新世初。河湖相泥岩、粉砂质泥岩的岩性特征代表了当时温湿的气候。研究区近东西向的古流向与玛扎塔格山脊近于平行,附合快速隆升构造地貌特征,暗示该套地层沉积时代(1.3~0.9Ma)对应了玛扎塔格山的快速隆升过程。  相似文献   

Experimental investigation of the height profile of sand-dust fluxes in the 0–50-m layer and the effects of vegetation on dust reduction     

Ming Zhao  Ke Jie Zhan  Guo Yu Qiu  Er Tian Fang  Zi Hui Yang  Yin Chang Zhang  Ai De Li 《Environmental Earth Sciences》2011,62(2):403-410

The height profile of sand-dust flux at 0–2.0-m has been well studied. However, there have been very few experimental studies in the 0–50-m layer. In this study, the height profile of sand-dust flux at 0–50-m was observed by using three sandstorm observation towers (50 m in height) in 2006. The towers were located at three sites with different vegetation conditions (desert, edge of an oasis, and oasis) in the Minqin region, a typical desert-oasis area in China. At the same time, the features of the underlying vegetation were investigated. Results indicated that in the 0–50-m layer, sand-dust flux decreased rapidly as height rose at the desert and the edge of oasis sites, whereas it increased slightly as height rose in the oasis site. At the three sites sand-dust fluxes at each height increased with wind velocity, and there was a fairly good exponential relationship among them. In 2006, a total of 19 sandstorms occurred. The annual sand-dust that passed through a 1-m-wide, 50-m-high section was 9,169 kg at the desert site, 5,318 kg at the edge of oasis site, and 2,345 kg at the oasis site. Compared with the desert site, the annual sand flux was lower by 42% at the edge of oasis site and 74% at the oasis site. Vegetation had a significant effect in reducing the sand-dust flux.  相似文献   

Temporal and spatial variability of soil organic matter and total nitrogen in a typical oasis cropland ecosystem in arid region of Northwest China   总被引：2，自引：1，他引：1  

Wenjie Liu  Yongzhong Su  Rong Yang  Qiu Yang  Guiping Fan 《Environmental Earth Sciences》2011,64(8):2247-2257

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