共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
从12月12日举行的北京市地面沉降监测网站预警预报系统（二期）工程竣工仪式上获悉,从现在起,北京首次实现了以城区为中心的整个平原区地面沉降的实时监测。随着北京市地勘局承担的预警预报系统（二期）工程全部建设完成并正式投入使用,首都的城市安全又多了一个守护神。 相似文献
3.
4.
张永海 《西安地质学院学报》2009,(3):327-330
GPS技术在大地测量、维护大地坐标系和进行全球板块运动或区域地壳形变监测中已得到非常广泛的应用,但在城市地面沉降监测方面,仍存在基准选取、系统参数对高程形变影响等问题。比较了平差过程中的不同基准模型,分析了各自的适用性,讨论了系统参数对平差结果的影响,得出附加系统参数和附有约束条件的网平差计算模型,最后对西安地区布设的GPS地面沉降和地裂缝监测网进行计算,比较了不同的平差方案,得出系统参数和不同基准模型对地面沉降数据处理的影响和适用性。 相似文献
5.
6.
张作辰 《水文地质工程地质》2005,32(3):i001-i001
随着我国经济建设对地下水和地下流体资源的大规模开发，我国有严重地面沉降灾害的城市已经超过50座，并形成了长江三角洲、华北平原和汾渭盆地等三大严重的地面沉降灾害区．地面沉降面积约94．000km^2。 相似文献
7.
张阿根 《中国地质灾害与防治学报》2005,16(1):1-4
上海的地面沉降在国内外具有典型性。沉降洼地的形成与发展在城市防汛、城区地面积水、重大线型工程差异沉降影响等方面对上海城市的可持续发展带来不利影响。地面沉降也通过洪涝、潮汛等显性灾害的成灾风险与致灾频率的增加，而体现出缓变型灾害的本质。上海目前已对全市地下水资源的开发利用实施有序管理，建立了覆盖全市整个陆域与第四纪地层的地面沉降监测网络体系，并融入了自动化测控与GPS监测等高新技术手段。同时密切结合城市总体建设发展规划，开展针对性的专题研究，深化城市地质工作，并注重与长江三角洲地区的联动。以科学有效的管理，落实可持续发展战略，使地区经济发展与地质生态环境保护协调统一。 相似文献
8.
地面沉降是常州市区主要地质灾害之一,也是制约常州城市经济发展的重要环境地质问题。为了厘清常州市区地面沉降态势,提升灾害防治能力,文章优化形成了集一等水准测量、GPS-InSAR监测、基岩标和分层标、光纤监测孔等多种监测技术方法,点-线-面相结合的常州市地面沉降立体监测网络,有效提升了常州市区地面沉降监测的精度及可靠性。基于常州城市地质调查成果,系统归纳了近几十年常州市区地面沉降发展历程。利用建成的多方法地面沉降监测网络获取的沉降变形数据,得出常州市区地面沉降总体现状及发展趋势、重点沉降区分布、主要沉降层位及成因机理等,最终提出常州市区地面沉降防治建议,为以后城市地质调查工作中地面沉降监测与防控工作提供参考。 相似文献
9.
针对宁波市地面沉降发展现状及风险评价需求，结合2017—2020年的InSAR遥感监测数据与沉降点监测数据，对近年地面沉降特征进行了分析。在此基础上建立了包括地面高程、沉降易发程度、地面累计沉降量、沉降速率、城市人口密度、建设用地占比重等6个评价因子为主的地面沉降风险评价体系。其中沉降易发程度为综合考虑地质条件、水文地质条件、人为活动影响后的综合性评价因子。地面沉降风险评价结果表明：宁波市地面沉降无高易发区，中、低易发区主要与区内全新世软土层厚大、历史上大量开采地下水、局部高强度城市建设以及沿海围垦工程等因素有关。最后，划分了地面沉降中风险区、低风险区、风险防控带，并提出了相应的地面沉降风险区管控建议。 相似文献
10.
本刊讯(段金平)5月16日,北京市地面沉降监测网站预警预报系统(二期)工程中的大兴区榆垡地面沉降监测站工程地质孔正式开钻,拉开了“二期工程”建设的序幕。 相似文献
11.
CSAMT 法在辽西康杖子区深部探矿中的应用 总被引：5，自引：0，他引：5
可控源音频大地电磁法(CSAMT)具有探测深度大、横向分辨率高、抗干扰能力强的特点,在深部找矿勘探中有着重要的指导意义。肖家营子铜钼矿床是辽西地区一个大型矽卡岩型金属矿床,大部分矿体是隐伏矿体,矿区外围的康杖子区与本区有相似的成矿地质环境,成矿地质条件优越.矿体与围岩电性差异明显,通过应用CSAMT,矿体具有低电阻特点,根据成果推断解释,对深部有利成矿部位进行了钻探验证,取得了理想的探矿效果,在矿区外围取得第二深度空间找矿重大突破。 相似文献
12.
Takeshi Nose Dr. 《GeoJournal》1985,10(3):261-276
Conclusions During the last ten years, aquaculture, especially mariculture has undergone remarkable expansion to counter-balance the gap between the supply and demand of fishery products in Japan. Its expansion has also been supported by the traditional preference of the Japanese people for seafood. Mariculture is now being forced to change its structure due to adverse economic circumstances such as the rise in the cost of energy, feeds and other materials for culture, low market prices, deterioration of environmental conditions, and many other factors. Before these constraints can be resolved, advanced scientific knowledge and technologies must be integrated to develop new types of aquaculture. Expansion of maricultural activities to more open-sea and off shore areas would be one route to follow. Technologies for the development of formulated diets not only for young but also for adults and larvae, establishment of feeding standards, prevention of epizootic diseases must support the establishment of modern aquaculture.The culture-based fisheries, or marine ranching, is becoming a subject for further development in Japan. Much research work has been conducted with a great degree of governmental support. Establishment of a net work of seedstock production farms has made it possible to carry out releasing experiments on a large scale. A newly integrated restoration system could be developed on the basis of these experiments, even though the profits resulting from the artificial restoration of stocks is not thouroughly verified at present. The commencement of a national scheme for culture-based fisheries would be a manifestation of the enthusiasm of the Japanese fish industry. 相似文献
13.
14.
15.
Julie Okpala 《GeoJournal》1990,20(1):37-43
This paper traces the development of geographic education in Nigeria and examines the views of geographers, other academics,
students and the public at large about the importance of geography. Geography's value is immense despite the non-professional
nature of the discipline. Nevertheless, there is a need to define geography's status and ensure career prospects for students.
The Nigerian Geographical Association (from classroom teaachers to top geographers) must promote geography, improve its status
in schools and universities, and continuously restructure its content and methods to address pertinent social needs. 相似文献
16.
Trends in landslide occurrence in Nepal 总被引：2，自引：0，他引：2
David N. Petley Gareth J. Hearn Andrew Hart Nicholas J. Rosser Stuart A. Dunning Katie Oven Wishart A. Mitchell 《Natural Hazards》2007,43(1):23-44
Nepal is a mountainous, less developed kingdom that straddles the boundary between the Indian and Himalayan tectonic plates.
In Nepal, landslides represent a major constraint on development, causing high levels of economic loss and substantial numbers
of fatalities each year. There is a general consensus that the impacts of landslides in countries such as Nepal are increasing
with time, but until now there has been little or no quantitative data to support this view, or to explain the causes of the
increases. In this paper, a database of landslide fatalities in Nepal has been compiled and analysed for the period 1978–2005.
The database suggests that there is a high level of variability in the occurrence of landslides from year to year, but that
the overall trend is upward. Analyses of the trends in the data suggest that there is a cyclicity in the occurrence of landslide
fatalities that strongly mirrors the cyclicity observed in the SW (summer) monsoon in South Asia. Perhaps surprisingly the
relationship is inverse, but this is explained through an inverse relationship between monsoon strength and the amount of
precipitation in the Hill District areas of Nepal. It is also clear that in recent years the number of fatalities has increased
dramatically over and above the effects of the monsoon cycle. Three explanations are explored for this: land-use change, the
effects of the ongoing civil war in Nepal, and road building. It is concluded that a major component of the generally upward
trend in landslide impact probably results from the rural road-building programme, and its attendant changes to physical and
natural systems. 相似文献
17.
2010年,美国铀矿总共施工7 209个钻孔,总进尺1 493 520 m;生产铀1 628.55 t;铀矿业总支出费用为2.773亿美元,其中铀矿地勘费支出为3 450万美元,占铀矿业总费用的12.44%。铀矿地勘钻探费用为4 460万美元,占铀矿业总费用的16.08%。 相似文献
18.
硫代砷是富硫化物地下水中砷的重要形态,对环境和人类健康有潜在威胁。目前硫代砷研究程度尚低,本次主要针对国内外地下水（地热水）中硫代砷的存在形态,水文—生物—环境地球化学过程,样品保存,定量检测方法等方面进行研究。结论如下:pH, 氧化还原电位,硫化物含量和微生物作用等是影响地下水中硫代砷稳定存在和形态分布的重要因素。含铁矿物能与水中的硫代砷形成配位键对其进行吸附,吸附性普遍弱于（亚）砷酸盐,因此,地下水中硫代砷可能表现出更强的迁移性。用于硫代砷检测的自然水样在采集中可采取过滤,速冻,厌氧和低温短期保存的操作流程,以减缓该形态的转化甚至消失。色谱联用ICP-MS系统可用于自然水样中硫代砷的分离定量检测,紫外—可见分光光度法和X射线吸收光谱法在不同场景下也可对硫代砷进行定量和表征分析。地热水和浅层地下水中均可能存在硫代砷,由于水样中硫代砷的不稳定性,室内检测和分析难以准确反映现场过程,因此,野外样品保存技术和现场检测方法的更新可能在未来有更大研究空间,值得进一步探索。 相似文献
19.