航磁与Srtm_DEM数据在小兴安岭覆盖区火山构造解译中的应用——以伊春市北部八家子地区为例

黑龙江省小兴安岭地区多金属矿产资源丰富,多与区域火山—岩浆活动密切相关,火山机构的精准、快速定位对区域矿产勘查具有重要意义,而小兴安岭地区基岩出露条件较差,文章尝试性地将航空磁力测量资料和数字高程模型(Srtm_DEM)数据相结合,在研究区内八家子地区解译出一火山机构及多组断裂构造,该成果丰富了该区地质信息;在覆盖区利用航磁和Srtm_DEM数据进行火山机构和断裂构造解译具有独特的优越性,能为区域寻找与次火山岩相关多金属矿产提供参考。     

Methods for processing aquatic mosses used as monitors of heavy metals

An evaluation is reported of methods used to prepare mosses for analysis when required for monitoring metal pollution. Fontinalis antipyretica and Rhynchostegium riparioides taken from the River Hoëgne, Belgium, were used for the study. The stages in preparation studied critically were the storage of the moss after it had been collected from the river, washing, choice of which particular fraction to use and the conditions for final drying prior to digestion. For any one particular treatment, the concentrations of metals analysed (Ca, Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb) were usually lower in Fontinalis than Rhynchostegium. Metal concentrations found as a result of the various treatments differed markedly for some metals, including Zn, Cd and Pb. However no one sequence of methods is ideal for all purposes. Criteria that need to be considered when selecting methods include the time and facilities available and whether the moss is to be used for monitoring long-term or short-term pollution.     

Relevance of peat-draining rivers for the riverine input of dissolved iron into the ocean

Peat bogs have the ability to produce strong chelate ligands (humic and fulvic acids) which enhance the weathering rates of iron-silicate minerals and greatly increase the solubility of the essential trace metal iron in river water. Fluvial networks link peat bogs with the ocean, and thus terrestrial-derived fulvic-iron complexes fuel the ocean's biological productivity and biological carbon pump, but understanding this role is constrained by inconsistent observations regarding the behaviour of riverine iron in the estuarine mixing zone, where precipitation reactions remove iron from the water column. We applied a characterization of the colloidal iron carriers in peatland-draining rivers in North Scotland, using field-flow fractionation (FFF), in combination with end-member mixing experiments of river water sampled near the river mouth and coastal seawater using a ⁵⁹Fe radiotracer method. According to our results, the investigated river contributed “truly dissolved” Fe concentrations of about 3300 nmol L^− 1 to the ocean which is nearly two orders of magnitude higher than the dissolved iron contribution of the “average world” river (∼ 40 nmol L^− 1). Thus we conclude that peatland-draining rivers are important sources of dissolved iron to the ocean margins. We propose highly electrostatic and sterical stabilized iron-organic matter complexes in the size range of < 2 kDa to be responsible for iron transport across the estuarine mixing zone.     

新疆西天山阿拉套山南缘阿克沙克组变质碎屑岩地球化学特征及其对物源区和构造环境的制约

新疆阿拉套山南缘出露的下石炭统阿克沙克组沉积地层,是西天山石炭纪构造演化的重要物质记录.阿克沙克组第一段以碎屑岩发育为特点,在泥质粉砂岩中含少量珊瑚、腕足及苔藓虫化石;阿克沙克组第二段受后期晚石炭世花岗岩侵吞,呈残留状出露,以碎屑岩角岩化和含板岩为特征.阿克沙克组变质碎屑岩岩原岩为泥质岩,高SiO2含量(63.91％～...     

岩门村滑坡高分辨率遥感调查与机制分析

 2007年7月7日,四川达县岩门村斜坡发生滑坡,造成直接经济损失约人民币1.5亿元。采用滑坡前后的高分辨率卫星影像及“数字滑坡”技术,获取滑坡地质环境及滑坡前后的道路、水塘、植被群位移及高程变化的定量信息,根据斜坡各部分变形特征,将其划分为主滑区、牵动滑区、强影响区及影响区4个部分,各自活动方式分别为快速推移+前缘砂土液化和面状流动,牵引(或后退)式滑移,受拉力发生拉张裂缝、错位和局部位移,以及受振动发生小规模的裂缝和错位。以DEM求得原地面以上的滑走及堆积方量分别为132.6×104和132.2×104 m3;结合钻孔资料求得滑面以上滑坡规模为1.97×106 m3。岩门村斜坡具备形成滑坡的岩性及坡体结构条件,但所临河谷狭窄,难以发育大型厚层滑坡,但有适宜的临空空间供局部浅层滑坡活动。长期强降雨是岩门村滑坡的主要触发因素。就斜坡整体而言,本次滑坡活动释放能量不充分,在连续降雨情况下局部可能再次发生浅层滑坡,但难以发生整体大规模滑移。     

粤港地区区域合作发展分析及区域管治推进策略

在分析粤港地区区域合作发展历程的基础上，对现阶段粤港地区区域合作的现状特点及存在问题进行了分析。并提出了一些推进粤港地区区域管治的策略措施，如围绕粤港合作联席会议深化区域管治组织体系建设等。     

Geomorphological mapping for route selection and road construction at lower Kihansi in Tanzania

This paper reports the use of geomorphological mapping to obtain a better understanding of the terrain for the Lower Kihansi Dam Access Road in the Udzungwa Mountains. The long-term accessibility of the road and protection of the natural resources of the area were pre-conditions for the construction of this road, which was primarily to facilitate the transportation of equipment, machinery and personnel during construction of a 54,000 m³ concrete gravity dam related to a 180-MW hydropower station. Black and white vertical aerial photographs supplemented with field mapping were used to prepare a 1 : 5,000 geomorphological map of a possible route corridor. The mapping identified areas with unfavourable ground conditions which were subsequently studied and characterized in order to select the final route. In sections where it was not possible to deviate the road from the unfavourable areas, protection and stabilization measures were considered during the design and construction phases. The road was constructed successfully and without causing damage to the environment. Geomorphological mapping proved to be a useful tool in selecting the optimum route and appropriate construction method.      

丘居--昆仑神话对中国早期居住理念的影响

丘居产生的原因,除了自然条件等物质层次的原因外,追求昆仑神话中昆仑仙境的精神层次也是人们钟爱丘居的重要原因。本文通过寻找古人丘居的证据,明确了丘居是模仿昆仑神话中昆仑山上的居住状态,古人以此来表达对昆仑山的崇拜之情。     

混凝土受压区为弓形或三角形时的正截面受弯承载力设计方法

在圆形截面构件承受的轴力很小而承受的弯矩很大的情况,混凝土的受压区为弓形,偶尔还可能出现混凝土的受压区为三角形的情况。虽然上述情况不如矩形受压区常见,但上述问题的解决却有工程实际意义。提出了上述两种情况下的正截面受弯承载力的设计方法,通过试算可以看出,两种情况下的运算均较简便,通过简单的手算即能使问题得到解决。     

解析鹤岗市迎宾大道景观带规划

阐述了迎宾道滨水景观带设计思路,并对设计中景观带规划的各个要素进行了分析,旨在打造出一条鹤岗市新兴的景观生态廊道,塑造鹤岗市的全新形象。     

批判的地域主义与建构

以批判的地域主义和建构理论为切入点,通过提炼对比批判地域主义理论的核心价值与建构理论的要素,提出二者的关联性,指出如果地域主义是一种理想,那么实现这种理想的过程就是建构实现的过程。     

秦岭北麓生态小城镇空间解析

我国秦岭北麓地区具有重要的生态地位,秦岭北麓面临着发展与保护发展问题。本文以生态保护为大背景,以相关城镇为抓手,对职能转型驱动下秦岭北麓生态小城镇空间相关因素做了简单的研究与分析,旨在为秦岭北麓集约发展提供思路     

秦岭北麓生态小城镇空间解析

我国秦岭北麓地区具有重要的生态地位,秦岭北麓面临着发展与保护发展问题。本文以生态保护为大背景,以相关城镇为抓手,对职能转型驱动下秦岭北麓生态小城镇空间相关因素做了简单的研究与分析,旨在为秦岭北麓集约发展提供思路。     

国家战略视角下新兴增长区域空间发展研究——以江苏沿海地区为例

多个地区区域发展规划的出台表明,新一轮国家空间战略的重点是规划引领新兴增长区域的发展,培育新的增长着力点.以江苏沿海地区为例,提出新兴增长区域在国家空间格局调整中逐步从边缘区转变为成长区,并成为国家和省域经济增长的重要支撑空间;城镇空间发展思路突出资源环境约束下的新型工业化、集中城镇化、生态化的发展策略,以城镇带、都市...     

地域文化与青岛沿海景观的营建

从城市固有的历史、文化、地理、城市现状等要素分析了城市沿海环境对景观地域特色的影响,阐述了青岛沿海景观地域特色的营建,指出对于地域文化在城市住区景观环境中的应用要采取广义地域主义创作观点,从而创作出既有地域特色又有时代气息的城市沿海景观环境.     

时频分析综合判断桩身质量完整性

简要介绍了反射波法基桩检测中时域和频域分析的基本原理,并举出了一组工程实例,通过抽芯对比,指出了在基桩完整性检测中,时频综合测试分析的重要性。