Real-time monitoring and early warning of landslides at relocated Wushan Town,the Three Gorges Reservoir,China   总被引：12，自引：6，他引：6  

Yueping Yin  Hongde Wang  Youlong Gao  Xiaochun Li 《Landslides》2010,7(3):339-349

A special monitoring and warning system has been established and improved in the Three Gorges Reservoir area since 1999. It is necessary to develop a real-time monitoring system on landslides because there are dense populations centered in the reservoir area and geo-hazards may be triggered by a 30-m water level fluctuation between 145 and 175 m in elevation during reservoir operation; the regular monitoring could not be suitable to the early warning on landslides. Since 2003, the authors have carried out a real-time monitoring and early warning project on landslides at the relocated Wushan town in the Three Gorges Reservoir area. The monitoring station includes Global Positioning System with high-accuracy double frequency to monitor ground displacement, time domain reflection technology, and immobile borehole, inclinometer to monitor deep displacement, piezometer to monitor pore water pressure, and precipitation and reservoir water level monitoring. Compared with traditional methods, the real-time monitoring is continuous and traceable in the acquisition process, and the cycle of data acquisition is very short, usually within hours, minutes, or even shorter. Based on the landslide monitoring experience at the Three Gorges Reservoir area, the early warning criteria on landslide are established in which the critical situation is classified into four levels: blue, yellow, orange, and red, respectively, expressed by no, slight, moderate, and high risk situation. Comprehensive judgment from multimonitoring data of Yuhuangge landslide in this area since 2004 suggested that the new Wushan town will be at the blue early warning level, although some monitoring data of individual displacement at deep borehole showed that the displacement was increased by 5 mm in 5 months with an average velocity of 1.0 mm/month, and the data of BOTDR also showed an obvious dislocation along a stairway on the landslide.  相似文献   

Dynamic analysis of the stabilized Wangjiayan landslide in the Wenchuan Ms 8.0 earthquake and aftershocks   总被引：4，自引：2，他引：2  

Yueping Yin  Bin Li  Wenpei Wang 《Landslides》2015,12(3):537-547

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Ore Genesis and Tectonic Significance of the Xiaojiashan Tungsten Deposit,Eastern Tianshan,Xinjiang, China: Evidence from Geology,Fluid Inclusions,and Stable Isotope Geochemistry     

Yunfei Zhou  Jiuhua Xu  Lihua Shan  Xihui Cheng  Yueping Deng  Wenhuan Feng  Lingxiao Qiao 《Resource Geology》2019,69(1):43-64

The Xiaojiashan tungsten deposit is located about 200 km northwest of Hami City, the Eastern Tianshan orogenic belt, Xinjiang, northwestern China, and is a quartz vein‐type tungsten deposit. Combined fluid inclusion microthermometry, host rock geochemistry, and H–O isotopic compositions are used to constrain the ore genesis and tectonic setting of the Xiaojiashan tungsten deposit. The orebodies occur in granite intrusions adjacent to the metamorphic crystal tuff, which consists of the second lithological section of the first Sub‐Formation of the Dananhu Formation (D₂d ₁²). Biotite granite is the most widely distributed intrusive bodies in the Xiaojiashan tungsten deposit. Altered diorite and metamorphic crystal tuff are the main surrounding rocks. The granite belongs to peraluminous A‐type granite with high potassic calc‐alkaline series, and all rocks show light Rare Earth Element (REE)‐enriched patterns. The trace element characters suggest that crystallization differentiation might even occur in the diagenetic process. The granite belongs to postcollisional extension granite, and the rocks formed in an extensional tectonic environment, which might result from magma activity in such an extensional tectonic environment. Tungsten‐bearing quartz veins are divided into gray quartz vein and white quartz veins. Based on petrography observation, fluid inclusions in both kinds of vein quartz are mainly aqueous inclusions. Microthermometry shows that gray quartz veins have 143–354°C of T_h, and white quartz veins have 154–312°C of T_h. The laser‐Raman test shows that CO₂ is found in fluid inclusions of the tungsten‐bearing quartz veins. Quadrupole mass spectrometry reveals that fluid inclusions contain major vapor‐phase contents of CO₂, H₂O. Meanwhile, fluid inclusions contain major liquid‐phase contents of Cl^?, Na⁺. It can be speculated that the ore‐forming fluid of the Xiaojiashan tungsten deposit is characterized by an H₂O–CO₂, low salinity, and H₂O–CO₂–NaCl system. The range of hydrogen and oxygen isotope compositions indicated that the ore‐forming fluids of the tungsten deposit were mainly magmatic water. The ore‐forming age of the Xiaojiashan deposit should to be ~227 Ma. During the ore‐forming process, the magmatic water had separated from magmatic intrusions, and the ore‐bearing complex was taken to a portion where tungsten‐bearing ores could be mineralized. The magmatic fluid was mixed by meteoric water in the late stage.  相似文献   

辽西地区构造演化与盆地成因类型研究   总被引：20，自引：2，他引：18  

王伟锋  陆诗阔  孙月平 《地质力学学报》1997,3(3):80-89

辽宁省西部地区发育了一系列中生代小型含煤盆地。这些盆地内有广泛的油气显示,但勘探效果却不理想。本文分析了辽西地区地球动力学背景,结合地球物理勘探资料研究了辽西地区盆地构造几何学和运动学特征,探讨了辽西地区构造演化史、盆地形成机制和成因类型,并以阜新盆地为例,阐述了盆地的构造特征和圈闭类型。   相似文献   

碳酸盐岩性因素控制下喀斯特发育特征─—以黔中南为例   总被引：15，自引：1，他引：14  

聂跃平 《中国岩溶》1994,13(1):31-36

黔中南地区位于贵州高原向广西盆地过渡的斜坡地带,各种不同性质的碳酸盐岩广泛出露。本文根据本区水文网对地表的切割所形成的“反常型河流结构”的特点,论述了在岩性因素控制下的喀斯特发育的同期异形特征及其发育机制。   相似文献   

九龙江口鳗苗溯河生态与资源研究   总被引：1，自引：0，他引：1  

方少华  吕小梅 《台湾海峡》1998,17(2):143-148

九龙江口Ｌｉ苗１９９４￣１９９６年溯河期为１９９４年１１月２０至１９９５年４月底。１９９５年１２月２０日至１９９６年５月底。鳗苗溯河期水温范围１１．５￣２２．５℃,盐度１．９８￣２５．００,透明度０．２￣１．１ｍ,九龙江口打石坑－嵩屿断面溯河鳗苗资源量１９９５年１９３ｋｇ,１９９６年２０８ｋｇ;海澄断面１９９５年３５ｋｇ,１９９６年５５ｋｇ。  相似文献   

南海西北部水域斑节对虾资源的调查研究   总被引：2，自引：0，他引：2  

钟振如  李辉权  张月平  陈敏 《热带海洋学报》1999,18(3):58

1989－1991年对南海西北部水域进行斑节对虾Penaeusmonodon资源专项调查。结果表明,斑节对虾的密集分布区在海南岛东部和南部海区,其现存资源量为82．6万尾,周年有体长30mm以下的幼虾出现。主要产卵期在9－12月。产卵场在海南岛东部和南部水深30-60m的海区。  相似文献   

福建闽南地区与广西北海地区波纹巴非蛤的形态差异与遗传多样性分析          下载免费PDF全文

周治东  张丽艳  霍云龙  李海平  何雪蒨  张跃平 《应用海洋学学报》2023,42(4):581-590

本研究采用形态学和微卫星分子标记对福建闽南地区（厦门、云霄、惠安）及广西北海4个野生波纹巴非蛤群体进行形态学与遗传多样性分析。主成分与聚类分析结果表明：惠安与北海群体的形态最为相近,其次为云霄群体,而厦门群体的趋异度最大。构建了两个主成分PC1和PC2,其中PC1的贡献率为36.134%,PC2的贡献率为21.443%,累计贡献率为57.577%。建立了4群体的判别函数,判别准确率P₁为43.3%~93.5%,P₂为44.8%~88.0%,综合判别率为66.1%。4个波纹巴非蛤群体的整体遗传多样性较高,群体间遗传分化微弱,属于同1个自由交配组群,NJ系统发育树聚类结果未检测到与地理位置相对应的谱系结构,这可能与人为引种、贸易及增殖放流等活动导致波纹巴非蛤不同群体间频繁基因交流有关。建议今后在波纹巴非蛤的资源管理和开发利用时,加强本地种质资源的保护。  相似文献   

Otolith development in larval and juvenile Schizothorax davidi: ontogeny and growth increment characteristics     

Yan  Taiming  Hu  Jiaxiang  Cai  Yueping  Xiong  Sen  Yang  Shiyong  Wang  Xiongyan  He  Zhi 《中国海洋湖沼学报》2017,35(5):1197-1204

Laboratory-reared Schizothorax davidi larvae and juveniles were examined to assess the formation and characteristics of David’s schizothoracin otoliths.Otolith development was observed and their formation period was verifi ed by monitoring larvae and juveniles of knownage.The results revealed that lapilli and sagittae developed before hatching,and the first otolith increment was identified at 2 days post hatching in both.The shape of lapilli was relatively stable during development compared with that of sagittae;however,growth of four sagittae and lapilli areas was consistent,but the posterior area grew faster than the anterior area and the ventral surface grew faster than the dorsal surface.Similarly,the sum length of the radius of the anterior and posterior areas on sagittae and lapilli were linearly and binomially related to total fish length,respectively.Moreover,daily deposition rates were validated by monitoring knownage larvae and juveniles.The increase in lapilli width was 1.88±0.080 0μm at the ninth increment,which reached a maximum and the decreased gradually toward the otolith edge,whereas that of sagittae increased more slowly.These results illustrate the developmental biology of S.davidi,which will aid in population conservation and fish stock management.  相似文献   

测流不确定度的插值方差估计法          下载免费PDF全文

白直旭  黄艳  许月萍 《水科学进展》2017,28(1):59-66

目前,测流不确定度通过误差试验或通过经验数值来确定,但这些方式存在着工作量大或不确定估计不足等局限性。为解决此问题,对基于实测数据和统计理论的插值方差估计法在不同测流条件下进行了验证,选取白河、襄阳和沙洋3个流量站进行了实测数据的不确定度分析,同时对白河站进行了Monte Carlo试验,比较插值方差估计法得到的不确定度与真实误差的差异。结果表明,插值方差估计法能较好地反映水位变化的影响,插值方差估计法所得到的不确定度与真实测流误差的相关系数达0.64,与断面水位变化的Spearman相关系数达0.79,高、中水位情况下插值方差估计法的不确定度估计结果较为合理,低水位情况下偏高。  相似文献