广东省两次流体宏观异常的落实

从外界干扰因素排除、区域构造活动异常鉴别、地下流体动力学等方面对广东省内出现的两次流体宏观异常进行了分析．讨论了引起异常的原因,从而排除了地震前兆的可能,对汶川地震后老百姓的“恐震”心理起到了安定作用。     

金融发展与海洋经济增长——基于我国沿海地区的实证研究

文章基于1999—2020年我国沿海地区的面板数据,在建立面板向量自回归模型（PVAR）的基础上,运用脉冲响应函数和方差分解等方法,从金融发展规模、效率和结构3个方面,分析金融发展对沿海地区海洋经济增长的影响及其动态关系。研究结果表明：在短期内,金融发展规模会对海洋经济增长产生促进作用,但在长期内可能会制约海洋经济增长;金融发展效率会促进海洋经济增长,并在长期成为主要的影响因素;金融发展结构对海洋经济增长具有促进作用,但持续期较短。因此,海洋经济增长离不开金融有力的支持,应合理控制金融发展规模、提高金融发展效率和优化金融发展结构,为海洋经济增长提供长效支撑,推动海洋经济可持续增长。     

Biodiversity and Sequence of the Middle Triassic Panxian Marine Reptile Fauna, Guizhou Province, China

Abstract: The Middle Triassic Panxian fauna is a physical marker and representative record of the rapid recovery of the Triassic marine ecosystem following the Early Triassic stagnant stage after the end-Permian mass extinction. Ten marine reptile taxa have been found from the 1.82–2.10 m-thick fossiliferous level in the Upper Member of the Guanling Formation, which can be subdivided into three marine reptile beds through the analysis on the stratigraphic distributions of fossil reptiles. The Lower Reptile Bed yields the sauropterygians Placodus inexpectatus Jiang et al., 2008 and Lariosaurus hongguoensis Jiang et al., 2006, the ichthyopterygians Xinminosaurus catactes Jiang et al., 2008 and Phalarodon cf. Phalarodon fraasi Merriam, 1910, associated with Mixosaurus panxianensis Jiang et al., 2006, representing a stage of predominance of durophagous taxa. In this bed, the large complete skeletons may reach up to 2.3 m in length, and lithofacies and chemostratigraphic analyses indicate a relatively deep carbonate platform with an oxic water environment near the bottom, as well as a rising sea level. The Middle Reptile Bed yields the sauropterygian Nothosaurus yangjuanensis Jiang et al., 2006 and the archosaur Qianosuchus mixtus Li et al., 2006, associated with Mixosaurus panxianensis Jiang et al., 2006. The fossils in this bed are characterized by its pincering dentition and large overall body size, with the largest possibly exceeding 3 m in length. This bed might represent a time of deepest basin with relatively anoxic condition near the bottom. The Upper Reptile Bed yields the sauropterygians Wumengosaurus delicatomandibularis Jiang et al., 2008, Keichousaurus sp., the protorosaur Dinocephalosaurus orientalis Li, 2003, and the ichthyopterygian Mixosaurus panxianensis Jiang et al., 2006. In this bed, reptilian taxa characterized by suction feeding appeared, and most are less than 1 m long. This bed corresponds to a period of decreasing water depth.     

不同气候区灌丛沙堆形态及土壤养分积累特征

灌丛沙堆是干旱、半干旱区绿洲边缘常见景观类型,在绿洲风沙防护及生物多样性保护方面有重要意义.本文对中国西北干旱区不同气候区常见的柽柳(Tamarix chinensis)、泡泡刺(Nitraria sphaerocarpa)和柠条锦鸡儿(Caragana korshinskii)灌丛沙堆形态和养分积累特征进行了对比研究...     

SWAN和甘肃省气象风险预警产品在岷县一次强对流过程中的应用

介绍了临近预报系统(SWAN)和甘肃省中小河流洪水和山洪地质灾害气象风险预警平台的产品特征及其在2012年5月10日甘肃岷县强对流天气过程中的应用。SWAN系统表明,在强回波影响岷县期间,监测到最大反射率因子达到50 dBZ以上,其对应的高度为9 km;风暴体内垂直积分含水量和回波顶高的极值分别达到15 kg/m2和18 km,表明风暴在影响岷县期间发展旺盛;TITAN风暴产品也较为准确地预测了风暴的发展方向和趋势;定量降水预报产品QPF对本次过程的降水落区预报较为准确,但是降水量级预报偏小。总体来看,SWAN系统在本次强对流天气过程中发挥了很好的监测预警功能。甘肃省中小河流洪水和山洪地质灾害气象风险预警平台在云图、雷达、自动区域站的多资料融合监测中也发挥了重要作用,其暴雨云团加强显示、降水估测等功能都对强对流风暴有很好的监测预警作用。     

湘桂及其邻区裂谷与铀成矿

裂谷是地壳演化过程中一种重要的构造形式，并表现出特定的成矿地质构造环境。湘桂地区在中晚元古代以来就经历了几次地壳裂解，控制了区内多旋回地槽的发展，至广西运动才完成基底的统一，转化为相对稳定的地台区。晚古生代，由于受到古特权斯和西太平洋构造活动的影响，使广布的台地陆表海产生一系列台沟，形成了一套含火山物质的深水相沉积建造，控制了区内有关矿产的形成和富铀地层的产出，印支运动使区内海盆关闭，地壳抬升并转化为地洼区。中、新生代出现了强烈的构造一岩浆活动，以及相间出现的伸展构造盆地，是区内铀矿床形成的主要时期。     

1997年9月三水地震震相特征与发震构造

１９９７年９月广东省三水市发生的ＭＬ３．７、４．４级地震因震中烈度比同等震级的其它震例偏高许多,而且多个台站均记录到长周期振动规则的正弦形面波而特别引人注目。精确测定了这组地震的震源位置,得到震源深度约等于１ｋｍ;对比分析了震相记录特征、震区周围的历史地震活动及地质构造背景,认为这是一组罕见的低震级高烈度震例,其发生可能与震中附近的Ｆ７断层活动有关。     

加筋软土海堤的稳定分析

本文对于淤泥质海岸上的路堤，采用竹筋土工布加固软基的处理方法，进行了三种作用机理的分析研究和不同方法的整体稳定性分析计算，提出了旋转式复合滑动和相应的稳定计算方法，同时还对竹筋格栅按弹性支承结构进行了力学分析与计算。结果表明，这种加筋效果既满足使用要求，又易于施工，比较经济，是一种较为理想的软土海堤的加固方法。     

Statistics of the Z–R Relationship for Strong Convective Weather over the Yangtze–Huaihe River Basin and Its Application to Radar Reflectivity Data Assimilation for a Heavy Rain Event

The relationship between the radar reflectivity factor(Z) and the rainfall rate(R) is recalculated based on radar observations from 10 Doppler radars and hourly rainfall measurements at 6529 automatic weather stations over the Yangtze–Huaihe River basin. The data were collected by the National 973 Project from June to July 2013 for severe convective weather events. The Z–R relationship is combined with an empirical qr–R relationship to obtain a new Z–qr relationship, which is then used to correct the observational operator for radar reflectivity in the three-dimensional variational(3 DVar) data assimilation system of the Weather Research and Forecasting(WRF) model to improve the analysis and prediction of severe convective weather over the Yangtze–Huaihe River basin. The performance of the corrected reflectivity operator used in the WRF 3 DVar data assimilation system is tested with a heavy rain event that occurred over Jiangsu and Anhui provinces and the surrounding regions on 23 June 2013. It is noted that the observations for this event are not included in the calculation of the Z–R relationship. Three experiments are conducted with the WRF model and its 3 DVar system, including a control run without the assimilation of reflectivity data and two assimilation experiments with the original and corrected reflectivity operators. The experimental results show that the assimilation of radar reflectivity data has a positive impact on the rainfall forecast within a few hours with either the original or corrected reflectivity operators, but the corrected reflectivity operator achieves a better performance on the rainfall forecast than the original operator. The corrected reflectivity operator extends the effective time of radar data assimilation for the prediction of strong reflectivity. The physical variables analyzed with the corrected reflectivity operator present more reasonable mesoscale structures than those obtained with the original reflectivity operator. This suggests that the new statistical Z–R relationship is more suitable for predicting severe convective weather over the Yangtze–Huaihe River basin than the Z–R relationships currently in use.     

宁夏北部地区土地覆盖模式及其发展潜力

With the objectives to acquire the fundamental data of the territorial resource,understand the impacts of human activities on the lan use and cover patterns and evaluate the potential of the future exploitation,and intensive land cover classification with and accuracy of 93?has been completed for North Ningxia by remote sensin technique based on the adoption of a combination method composed of texture training,maximum likelihood classification and post-processing such as re-allocation and aggregation.This classification result was incorporated with the contemporaneous socio-economic and meteorological data for cross-sectional regression modelling to reveal the spatial determinants of the land cover patterns and understand the human-environmental relationships.A tentative evaluation on the potential of soil exploitation in the near future was carried out in combination with our land use and cover change detection results aiming at supplying some useful references for the central and local governments in their sustainable land use planning.