萨拉乌苏河流域萨拉乌苏组砂丘砂沉积特征

The Salawusu Formation of Milanggouwan section in Salawusu River Valley includes 7 layers of paleo-mobile dune sands, and 4 layers of paleo-fixed and semi-fixed dune sands. Their structures have been observed and their grain size, surface textural features and several main chemical elements have been analyzed. The results showed that： 1） Some of the aeolian structural characteristics of these dune sands are similar to that of the recent dune sands. 2） They are also similar to the recent dune sands in grain size components, and parameters of Mz,σ, Sk and Kg, as well as in several main chemical components. 3） The scattergrams of Mz-σ and SiO2-Al2O3＋TOFE and the probability curves of grain size showed that these paleo-dune sands are different from paleosols and fluvio-lacustrine facies, but are consistency with recent dune sands. 4） Quartz sands have well roundness and surface textural features such as dish-shaped pits, crescent-shaped pits, pockmarked pits, upturned cleavage plates, siliceous precipitates and siliceous crevasses, indicating that they had been carried for a long time by the wind. As the 11 layers of paleo-dune sands possess the aeolian characteristics in structure, grain size, surface textural features and chemical elements, the origin of their formation should be attributed to eolation.     

我国市县地球物理监测资源评估

我国地球物理监测站网主要由GNSS、定点形变、重力、地电、地磁、地下流体六大观测站网组成,由国家站、省级站和市县站构成基本监测单元。市县站观测手段多、站点数量庞大,是地球物理监测站网的重要组成部分。为摸清市县站监测资源底数、统筹利用市县监测数据,中国地震局历时2年完成了我国市县地震监测资源评估工作。基于此项工作,本文从观测环境、观测系统、数据质量和预报应用四个方面对我国市县地球物理监测资源进行简要分析,评估结果显示: 37.8%的测项评估为合格,可直接纳入国家地球物理数据库管理,47.9%的测项评估为基本合格,可纳入国家市县数据库管理,14.3%的测项评估为不合格,需要停测或者优化改造。针对评估结果,简要分析了市县监测运维工作存在的主要问题并提出具体可行的解决建议,为提升市县站监测质量提供参考。     

差分InSAR处理及其应用分析

本文结合实例分析和介绍了影响In SAR处理结果的几个重要环节。如: 数据源及像对选择 ;影响In SAR处理的因素等。目前有4～5种雷达卫星数据可以用于In SAR的处理,ERS-1/2卫星数据效果最好; 差分In SAR处理的工作步骤中,亚像元精度的配准、相干性分析、全相位恢复等是其中的关键技术。In SAR的精度和噪声水平是In SAR能否实用的重要条件,噪声影响地物的相干性,噪声较大部位相干性消失,在整幅图像中噪声区域不大于30% ,将不影响整体的In SAR测量结果。     

基于岩相的鄂尔多斯白垩系盆地含水层系统结构的研究

依据岩性岩相研究、孔隙度研究、物探洲井解译等成果,对鄂尔多斯白垩系盆地含水层系统的结构进行了划分与研究.结果袁明:盆地北部沙漠高原区含水层系统为单一结构,表现为强富水与中等富水含水层在垂向上叠置与组合,无区域性连续稳定的隔水层,由下到上构成含水统一体;南部黄土高原区为多层结构,表现为含水层与隔水层上下叠置,垂向水文地质分层明显:盆地南、北含水层的结构类型明显不同.利用孔隙度、渗透系数、单位涌水量3个参数,对含水层的富水性级别进行了划分,盆地中共划分出7个强富水含水层、7个中等富水含水层和2个弱富水舍水层.盆地南、北比较,北部含水层孔隙度大,富水性强,地下水主要富集于盆地北部地区.垂向上比较,盆地北部由上到下,孔隙度由大变小,富水性由强变弱,地下水主要富集于浅层和中层:南部上部罗汉洞组和下部洛河组孔隙度较大,富水性好,中部环河组相对较差.地下水主要富集于罗汉洞组和洛河组.     

九寨沟7.0级地震房屋震害现场调查及其破坏特征

2017年8月8日四川省阿坝州九寨沟县发生7.0级地震,震源深度20 km,造成大量房屋不同程度的破坏,引发地质灾害。针对Ⅷ、Ⅸ区的337栋不同结构类型的房屋进行了震害特征分析,给出震害矩阵,揭示各类结构房屋的破坏机理。经过统计,所调查的房屋中3.3%的建筑保持完好,19.9%的建筑发生轻微破坏,51.3%的建筑发生中等破坏,21.1%的建筑发生严重破坏,4.5%的建筑发生毁坏。经过调查,钢筋混凝土框架结构、大跨度空间结构、钢框架结构以及采用木板作为填充墙的穿斗式木构架房屋在本次地震中表现良好。分析表明,经过合理的抗震设计,基本达到了中震可修的抗震设防目标,极大程度地保护了人们的生命及财产安全。     

1990年以来中国小麦农业气象灾害时空变化特征(英文)

Agro-meteorological disasters(AMD) have become more frequent with climate warming. In this study, the temporal and spatial changes in the occurrence frequency of major meteorological disasters on wheat production were firstly explored by analyzing the observed records at national agro-meteorological stations(AMS) of China from 1991 to 2009. Furthermore, impact of climate change on AMD was discussed by comparing the warmer decade(2000–2009) with another decade(1991–2000). It was found that drought was the most frequent disaster during the last two decades, with a highest proportion of 79%. And the frequency of AMD increased significantly with climate change. Specifically, the main disasters occurred more frequently in the reproductive period than in the vegetative period. Besides, the spatial changes in the AMD frequency were characterized by region-specific. For example, the wheat cultivation areas located on the Loess Plateau and the middle-lower reaches of the Yellow River suffered mainly from drought. All these results were strongly linked to climate change in China. Therefore, sound adaptation options should be taken based on the latest changes of AMD under global warming to reduce agricultural damages.     

桐柏县矿业秩序整顿出重拳

自2004年12月以来，桐柏县在全县范围内开展了以打击无证采矿、以采代探、非法选厂等严重违法矿业活动为主的矿业秩序专项治理整顿工作，取缔无证矿点39家，查封非法选厂77家，炸封洞口、充填井硐45家，拆除工棚150间，张贴封条300份，没收非法采矿设备200余件，抓获涉爆违法犯罪人员46人，其中行政拘留29人，刑事拘留6人，罚款11人，促使2家业主新取得采矿许可证，2家探矿权人提交地质储量报告，桐柏县矿业开发秩序正在朝着持续、健康、快速方向发展。     

厦门湾潮、余流及其对泥沙、污染物质迁移的影响

随着厦门经济特区建设的发展,如何合理迅速地开发利用厦门湾,已成为厦门市急需深入研究的课题。其中,港口建设、交通运输、环境保护、生物资源的保护和开发利用等等无不与潮、余流情况密切相关。由此可见,潮、余流的调查研究是关系到厦门湾开发利用的基本问题之一。一、资料来源     

埃尔尼诺现象与东海黑潮区及其邻近海域水文结构和环流的变异：东海黑 …

本文阐明ＥＮＳＯ现象与台湾岛东北部冷涡关系,在ＥＮ年夏季仅能出现东北型及该型双涡Ⅰ型,而非ＥＮ和ＥＮ年则出现东侧型和西侧型及双涡Ⅱ,Ⅲ型,此外还在前人研究基础上,给出东海东北部环流图式和在ＥＮ年夏季环流图式,还对海洋锋等进行初步讨论。