TIME EVOLUTION OF LOCAL SCOUR AT OBSTACLES PROTRUDING FROM CHANNEL SIDE WALLS

1 mnCnONLocal scour close to bridge piers and abUtInnts has long been a subect of concem for engineers, sinceit can We total or partial collapse of bridges. Until to the Present, local scour has been assessed, moshy,on the basis of resultS of labOratOry stodis. These sthes were cwhed out for steady flows lashng longenough as to gUarantee the develoPment of equlllbrium scour i.e., the develoPmen of scour holes whosedePth and 8haPe no lOnger significanti evolve with hme.In nta, such long l…     

塔中涡动资料不同坐标旋转方法比较分析

坐标旋转是涡动协方差(EC)通量观测数据后处理当中必须进行的步骤,本文利用塔克拉玛干沙漠腹地塔中西面标校站自然沙丘上3 m高度和塔中本站32 m高度2009年4—10月湍流通量数据,对比分析了不同坐标旋转方法在塔中通量观测数据中的应用。结果表明,塔克拉玛干沙漠腹地塔中湍流各通量在旋转订正前后差别不显著,不订正造成的通量计算误差1%。塔中32 m和塔中西站3 m通量计算误差,与两个站点的采集仪器架设高度差别较大有关。即使对于相对平坦的下垫面,也必须要进行倾斜校正,以修正地势、仪器振动、安装倾斜等产生的虚假信息。本研究对塔中涡动资料进行旋转时采用了二次坐标旋转方法。此结果为塔克拉玛干沙漠腹地EC通量观测的风速仪倾斜校正提供参考。     

1999年山西大同-阳高5.6级地震灾害损失评估

１９９９年１１月１日在山西省大同县和阳高县间发生Ｍｓ５．６地震,通过野外调查,对这次地震灾害损失进行了评估。评估结果表明,这次地震受灾面积达３２４ｋｍ＾２,主要受灾村５６个,重伤１０人,轻伤６０人,总经济损失为１４０２３万元。指出灾区所有房屋经历了１９８９年、１９９１年１次或２次中强地震的破坏,抗震能力明显降低是这次震害较生的主要原因。并针对这次震害的特征,提出防御与减轻震害的经验、教训及有关建议     

Photometric Survey of Galactic Open Clusters

1　ＩｎｔｒｏｄｕｃｔｉｏｎＯｐｅｎｃｌｕｓｔｅｒｓａｒｅｉｄｅａｌｔａｒｇｅｔｓｗｉｔｈｗｈｉｃｈｔｏｉｎｖｅｓｔｉｇａｔｅｔｈｅｓｔｒｕｃｔｕｒｅａｎｄｅｖｏｌｕｔｉｏｎｏｆｔｈｅＧａｌａｃｔｉｃｄｉｓｋａｓｗｅｌｌａｓｔｈｅｆｏｒｍａｔｉｏｎａｎｄｅｖｏｌｕｔｉｏｎｏｆｓｔａｒｓａｎｄｓｔｅｌｌａｒｃｌｕｓｔｅｒｓ.Ｔｈｅｒｅａｒｅａｂｏｕｔ1 ,2 0 0ｋｎｏｗｎｏｐｅｎｃｌｕｓｔｅｒｓｉｎｔｈｅＣａｔａｌｏｇｕｅｏｆＯｐｅｎＣｌｕｓｔｅｒＤａｔａ (Ｌｙｎｇａ 1 987) .Ｉｎｓｐｉｔｅｏｆｍａｎｙ…     

Observation Study on Precursory Geosound: Extraction of Nucleation Information in the Earthquake Preparation Process

In this paper, the observation networks of precursory geosound and observation instruments are introduced first. Then it is mentioned, in particular, that audible precursory geosound was instrumentally recorded for the first time. The following section discussed the relation between the geosound and earthquake. Finally, the Nucleation time in earthquake preparation process is discussed.     

Structural Styles of Fronts of Thrust-Detachment Faults in Petroleum-bearing Areas of Western China

The front of a thrust-detachment fault may have various styles such as decoupling, fold, forethrust and backthrust ones because of differences in magnitude, direction and time of the forces exerted on the fault and the inhomogeneity of rock mechanical properties. They have different characteristics and are usually associated with gravity structure, inverse structure and diapir structure. These structures exist together in the same thrust-detachment fault and can influence, compensate for and convert into each other. They provide important grounds not only for the study of the dynamic state, propagation mode, evolutionary process and formation mechanism but also for the analysis of the petroleum generation, migration, accumulation and preservation and arrangement of drill holes in foreland basins.     

Paleomagnetism of Cretaceous Red beds from Eastern Part of South China Block

INTRODUCTIONCollisionofIndiawithAsiaappearstohavebroughtaboutlargetectonicdeformationofAsia,especiallyEastAsia(Tapponnieretal.,1986).Post-Cretaceousdeformation(translationand/orrotation)ofSimaoandIndochinablocks,whicharelocatedatthesouthernsideofRedRiverfault(RRF),hasbeenreportedfromCretaceouspaleomagneticin-vestigations(Yangetal.,l995;HuangandOpdyke,l993IYangandBesse,1993).AlsoinSouthChinablock(SCB)locatedatnorthsideoftheRRF,localdeformationofsomeregionsneartheRRFhasbeendocum…