共查询到20条相似文献，搜索用时 62 毫秒
1.
本文综述了第四届全国工程地质会议的主要成果,以90年代工程地质学与国民经济发展为主题,讨论了区域工程地质、环境工程地质、地质灾害、岩体工程地质、土体工程地质、海洋工程地质、岩土工程、地质工程及各类建筑的工程地质问题。 相似文献
2.
郭玉琨 《海洋地质与第四纪地质》1985,(1)
应地质矿产部的邀请,以苏联地质部副部长B.A.雅尔玛留克为首的苏联地质代表团一行六人,于1985年1月8日对海洋地质调查局进行了友好访问.代表团在沪期间,海洋地质调查局局长路丙章、总工程师杨启伦,分别向代表团介绍了海洋地质调查局的组织机构和我国海洋地质工作的进展及研究概况,观看了海洋地质调查局摄制的有关海洋地质调查概况的录相片.双方对相互关心的海洋地质及石油地质方面的有关问题进行了友好交谈.苏联 相似文献
3.
海洋地质资料不仅是地质资料的重要组成部分,而且是国家的宝贵财富,开发和利用海洋地质资料是海洋地质资料工作者的一项重要任务。青岛海洋地质研究所通过承担"海洋地质资料服务产品开发示范"课题,对海岸带地质资料服务产品开发示范和委托保管海洋地质资料服务展开了探索和研究,对项目的工作背景、工作方法和取得的研究成果进行了介绍和总结。 相似文献
4.
琼州海峡物探资料解释及灾害因素分析 总被引：4，自引：0，他引：4
利用在琼州海峡所采集的综合地球物理资料和地质钻探资料及围区地质资料,对该区的海底表层以地质,浅部地质和中一学位中地质进行了解释,阐述了主要地层的地球物理特征,并对存在的灾害因素进行了初步分析。 相似文献
5.
利用在琼州海峡所采集的综合地球物理资料和地质钻探资料及围区地质资料,对该区的海底表层地质、浅部地质和中─深部地质进行了解释,阐述了主要地层的地球物理特征,并对存在的灾害因素进行了初步分析。 相似文献
6.
7.
《海洋地质与第四纪地质》2015,(4)
以青岛海洋地质研究所发表的论文和同期馆藏地质资料为对象,同步研究了1979-2013年间共35年的文献和资料增长情况,获得了二者的指数增长模型并划分出2个增长阶段。在对比分析的基础上,重点讨论了影响我国海洋地质文献增长的主要因素,其中,原始地质资料的积累是海洋地质文献增长的主要驱动因素,海洋地质科研人员的增加和国家需求与投入是海洋地质文献增长的内部和外部原因。 相似文献
8.
尹可钦 《海洋地质与第四纪地质》1990,(3)
1990年6月30日,在地矿部海洋地质研究所,由青岛市地质学会主持召开一次青岛农业地质学术研讨会。会上有五位同志作了有关农业地质的论述报告,青岛市农业局负责人也对青岛市农业生产与发展形势作了介绍,与会同志对地质如何为农业服务进行了热烈讨论。大家认为过去地质部门把地质力量多集中在地质科学基础研究。同时在找矿、水文地质和工程地质等应用地质方面作了不少工作,其中有些研究水平达到了国内先进水平和国际水平。但把地质理论直接运用到为农业生产上,还是近几年才兴起的一门新学科,这门为农业生产服务的边缘学科,在农村这个广阔的天地是大有作为的。然而过去我们广大地质工作者在野外从事地质找矿工作,也常到农村参加劳动,但都很少有人去考虑如何把地质理论知识运用到农业发展上去。在改革开放的今天,发展农业一靠政策;二靠科学;三靠投入。科学种田已被广大农民所接受。改良土质和提高单位面积产量,从农业地质角度讲,都有大量的实际工作可做。因此,地质工作者有责任推动这一学科的应用和发展。 相似文献
9.
现代黄河三角洲几乎处处都有人为地质作用，其结果开；成各种各样的人工地质体．本文简要介绍了黄河三角洲人为地质作用的类型、特征和对地质环境的影响 相似文献
10.
张以诚 《海洋地质与第四纪地质》1983,(1)
在亚洲近海资源勘察联合协调委员会和联合国亚太经社会的赞助下,由中国区域第四纪地质中心筹委会主办的国际第四纪地质考察和讨论会,于1982年11月15日至27日在我国举行.印度尼西亚、日本、马来西亚、菲律宾、泰国、英国、加拿大、荷兰、美国和中国等国家的四十多位第四纪地质专家,以及亚洲近海资源勘察联合协调委员会和联合国亚太经社会官员,出席了这次会议.印尼、马来西亚、菲律宾、泰国和日本的代表,分别回顾了本国第四纪地质工作情况,展望了未来的发展.中国代表在会议期间作了《中国第四纪地质工作概况》、《南海第四纪地质和海洋地质工作情况》、《珠江三角洲第四纪地质特征》、《南海北部及广东雷琼地区第四纪地质特征》、《长江三角洲第四纪地质特征》及《上海的地面沉降及其控制》等八个学术报告. 相似文献
11.
Chandralata Raghukumar G. Sheelu P. A. Loka Bharathi Shanta Nair C. Mohandass 《Marine Georesources & Geotechnology》2001,19(1):1-16
In order to assess the impact of deep-sea mining on the in situ benthic life, we measured the microbial standing stock and concentration of organic nutrients in the deep-sea sediments of the Central Indian Ocean Basin in the Indian pioneer area. Sediments were collected using box core and grab samples during September 1996. The total bacterial numbers ranged from 10 10 -10 11 cells per g -1 dry weight sediment. There was a marginal decrease in the number of bacteria from surface to 30 cm depth, though the subsurface section registered a higher number than did the surface. The highest numbers were encountered at depths of 4-8 cm. The retrievable number of bacteria were two orders less in comparison with the direct total counts of bacteria. An almost homogeneous distribution of bacteria, total organic carbon, living biomass, and lipids throughout the depth of cores indicates active microbial and benthic processes in the deep sea sediments. On the other hand, a uniform distribution of total counts of bacteria, carbohydrates, and total organic carbon in all the cores indicates their stable nature and suggests that they can serve as useful parameters for long-term monitoring of the area after the benthic disturbance. Further studies on temporal variability in this region would not only verify the observed norms of distribution of these variables but would also help to understand restabilization processes after the simulated benthic disturbance. 相似文献
12.
Arne Schnack-Friedrichsen Angela M. Davis Jim D. Bennell Dei G. Huws 《Marine Georesources & Geotechnology》2001,19(4):221-243
The interdependence between the seismo-acoustic properties of a marine sediment and its geotechnical/physical parameters has been known for many years, and it has been postulated that this should allow the extraction of geotechnical information from seismic data. Though in the literature many correlations have been published for the surficial layer, there is a lack of information for greater sediment depths. In this article, a desktop study on a synthetic seafloor model illustrates how the application of published near-surface prediction equations to subsurface sediments (up to several tens of meters burial depth) can lead to spurious predictions. To test this further, acoustic and geotechnical properties were measured on a number of sediment core samples, some of which were subjected to loading in acoustically-equipped consolidation cells (oedometers) to simulate greater burial depth conditions. For low effective pressures (representing small burial depths extending to around 10 meters subsurface), the general applicability of established relationships was confirmed: the prediction of porosity, bulk density, and mean grain size from acoustic velocity and impedance appears generally possible for the investigated sedimentary environments. As effective pressure increases through, the observed relationships deviate more and more from the established ones for the near-surface area. For the samples tested in this study, in some instances increasing pressure even resulted in decreasing velocities. There are several possible explanations for this abnormal behavior, including the presence of gas, overconsolidation, or bimodal grain size distribution. The results indicate that an appropriate depth correction must be introduced into the published prediction equations in order to obtain reliable estimates of physical sediment properties for greater subsurface depths. 相似文献
13.
海上大直径钢管桩打桩过程中,桩周土体受到强烈扰动而发生强度弱化,掌握桩周土体强度弱化规律对于准确预测打桩过程、保证工程安全具有重要意义。为研究土体强度弱化规律,开展了环剪试验模拟打桩对桩周土体的扰动,测试土体强度随剪切速率的变化规律,建立了描述土体强度弱化规律的拟合公式,引入到打桩分析软件中。研究结果表明：土体的强度折减程度不仅与土体本身的性质有关还受到土体的埋深和剪切速率的影响,埋深越深土体强度折减程度越低,剪切速率越高土体强度折减越高,在打桩分析中可采用这里推荐的线性折减方法来模拟不同深度处土体强度的折减规律。 相似文献
14.
Geoacoustic Inversion via Genetic Algorithm and Its Application to Manganese Sediment Identification
An acoustic inversion method using a wide-band signal and two near field receivers is proposed and applied to multiple layered seabed models including a manganese sediment. The inversion problem can be formulated into a probabilistic model comprised of signals, a forward model, and additive noise. The forward model simulates wide-band signals, such as chirp signals, and is chosen to be the source-waveletconvolution plane wave modeling method. The wavelet matching technique, using weighted least-squares fitting, estimates the sediment sound-speed and thickness on which determination of the possible numerical ranges for a priori uniform distribution is based. The genetic algorithm is applied to a global optimization problem to find a maximum a posteriori solution for determined a priori search space. Here the object function is defined by an L 2 norm of the difference between measured and modeled signals. Not only the marginal pdf but also its statistics are calculated by numerical evaluation of integrals using the samples selected during importance sampling process of the genetic algorithm. 相似文献
15.
Shigehisa Nakamura 《Marine Geodesy》2000,23(1):55-61
Specific properties of the interannual sea level variations and annual tides in the Northwestern Pacific were studied. Several tide stations were monitored. The monthly mean sea level for the year of 1995 was analyzed at each tide station. A seismic event in 1995, some tectonic activity around the subject area, and the Kuroshio (the oceanic western boundary current) may possibly contaminate results which would have occurred from the astronomical annual tide alone. 相似文献
16.
17.
Oedometer tests have been carried out on 70 undisturbed surficial clays (at approximately 250 mm below the mudline), mostly collected by free-fall corers from sites widely scattered throughout the deep-sea North Atlantic. Acoustic measurements were also made, initially on contiguous samples and ultimately on the same sample using a geophysically instrumented oedometer which also collected electrical resistivity data. Apart from those quiescent areas below the carbonate compensation depth, such as north of the West Indies where very fine clays exist, most of the samples are silty clays whose geotechnical-geophysical properties are dependent on the type of clay minerals present (and their ability to take in moisture), the sand-size fraction, and the quantity of carbonate present. Thus the pure clays have high compressibilities which decrease on the addition of coarse particles, while the converse is true for the acoustic parameters, these increasing with the sand fraction. Using the notion of the intrinsic compression line for all samples, and comparison to it of the measured compression curves, it is clear that, contrary to some previously held ideas, most deep-sea clays are normally consolidated; the addition of carbonate has the effect of creating an open, stronger sediment skeleton. Interestingly, where information is available, the variation with depth of a sample's acoustic velocity follows the void ratio pressure relationship of the compression curve. This allows the construction of an in-situ sediment compression curve using the in-situ geophysical observations. 相似文献
18.
19.
Phylogenetic diversity and phenotypic characterization of cultivable bacterioplankton isolated from polar oceans 总被引：1，自引：0，他引：1
A set of 27 marine planktonic bacteria isolated from the polar regions was characterized by 16S rDNA sequencing and physiological and biochemical testing. More than half of these bacteria were positive for caseinase, gelatinase and 13-glucosidase, and could utilize glucose, maltose or malic acid as carbon source for cell growth. Twelve isolates expressed nitrate reduction activities. Except for one antarctic isolate BSwlO175 belonging to Actinobacteria phylum, these isolates were classified as γ-Proteobacteria, suggesting that γ-Proteobacteria dominated in cultivable marine bacterioplankton at both poles. Genus Pseudoalteromonas was the predominant group in the Chukchi Sea and the Bering Sea, and genus ShewaneUa dominated in cultivable bacterioplankton in the Prydz Bay. With sequence similarities above 97%, genus Psychrobacter was found at both poles. These 27 isolates were psychrotolerant, and significant 16S rDNA sequence similarities were found not only between arctic and antarctic marine bacteria （ 〉 99% ）, but also between polar marine bacteria and bacteria from other aquatic environments （ ≥ 98.8% ）, including temperate ocean, deep sea, pond and lake, suggesting that in the polar oceans less temperature-sensitive bacteria may be cosmopolitan and have a bipolar, even global, distribution at the species level. 相似文献
20.
The effect of different fixation and storage protocols on the flow cytometric (FCM) simultaneous analysis of bacterioplankton and phytoplankton in coastal seawater samples (Mediterranean coastal lagoons) was investigated. FCM measurements (cell number, fluorescence and scatter characteristics) were obtained through DAPI staining. Three fixatives [glutaraldehyde (GA), formaldehyde (FA) and paraformaldehyde (PFA)] and two storage (3 months duration) methods (5 °C and −196 °C) were tested. Two dominant populations were detected in studied samples: bacteria and eukaryotic picophytoplankton. Adding fixatives (2% final concentration) appears necessary to obtain FCM exhaustive counts of all the bacteria and phytoplanktonic cells. This was related to the permeation effect of fixatives which allowed a better DAPI staining of the cells. Maximum fluorescence, i.e. optimal staining of the cells was obtained with FA or PFA, and significant lower fluorescences with GA. Fixed samples stored at 5 °C induced rapid cell loss. Only storage in liquid nitrogen of samples fixed with FA or PFA, allows mid-term (≥4 months) preservation of bacteria or picophytoplankton cell numbers, and limited evolution of DAPI-induced fluorescence and scatter characteristics. 相似文献