共查询到19条相似文献，搜索用时 171 毫秒
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宁德三都澳位于福建省东部沿海,口小腹大水深,为中国乃至世界罕见天然良港,阐述全新世以来,三都澳的地壳沉降规律、新构造运动特征,分析三都澳在全新世（1万年）以来,以及全新世晚期（三千多年）来,澳内沉降速率,淤积物等情况,认为三都澳成为世界性良港原因,是地壳沉降作用整体大于澳内淤积物。 相似文献
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刘权富 《水文地质工程地质》1996,23(2):50-50
潜孔锤钻进方法在盐田港抛填土石层工程地质勘察中的应用盐田港位于广东省珠江三角州东部、香港以北、大鹏湾内。正在建设的中港区规划布置—～四代集装箱及其以上泊位２８个，均是采用劈山填海建造。在对港区进行工程地质勘察时，针对港区地层主要是人工抛填的松散土石层... 相似文献
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王可 《水文地质工程地质》2000,27(2):3
岩土工程勘察信息处理系统ＫＴ２０００软件是由上海澳泰科系统工程有限公司开发,于２０００年１月１４日在京通过建设部组织专家鉴定。通过与会专家评估,该软件采用数据库管理,较好的将计算机技术与岩土工程勘察结合起来,运行稳定,符合《岩土工程勘察规范》标准,总体达到国内领先水平。它的推出,对提高岩土工程勘察报告的编制效率能够起到积极的促进作用。岩土工程勘察信息处理系统KT2000在京通过建设部组织专家鉴定$上海澳泰科系统工程有限公司@王可 相似文献
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厦门港东渡港区二期工程经国家计委批准立项,由交通部第四航务工程勘察设计院于1987年完成工程可行性研究,1988年5月完成初步设计;1988年11月～1989年分批完成施工图设计。 相似文献
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林崇宇 《华北地质矿产杂志》1994,9(3):322-327
上海市城市地质勘察工作综述林崇宇（中国船舶工业总公司勘察研究院）１工程地质与岩土工程近十几年来上海进行了大量工程地质勘察。进入９０年代，勘察部门由单一工程勘察，逐渐转为岩土工程勘察。加之测试技术、室内土工试验和钻探技术的不断改进和发展，各勘察单位又自... 相似文献
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因重金属难以被生物降解,易形成毒害环境因子,沉积物中的重金属污染演变是工业化以来全球共同面临的生态环境问题。为揭示福建三都澳地区人类活动与重金属沉积的关系,对采集自三都澳海域的6根岩心柱进行了系统的粒度分析、210Pb测年以及重金属元素测试。研究结果表明：（1）近百年来,三都澳海域沉积物重金属含量呈现显著增加趋势,顶部比底部增加1.01~2.8倍,并表现出3个明显演变阶段：1900-1950年,沉积物中的重金属含量相对稳定;1950-2000年,重金属含量开始缓慢增加;2000年以来,远岸区重金属含量急剧增加。这种变化趋势与人口、经济发展密切相关。（2）三都澳近岸区沉积物重金属含量总体大于远岸区,自2000年以来,近岸区和远岸区沉积物重金属含量的演变趋势呈现差异性,表现为近岸区重金属含量有所降低,远岸区重金属含量急剧升高,这种时空差异与沉积物粒度变化及地区产业分布有密切关系。（3）重金属对三都澳海洋生态环境影响较大,在湾内渔业养殖强度越来越高的背景之下,应对近期以来湾内重金属含量的快速升高给予足够重视,提高保护和修复治理力度,避免海洋生态破坏。 相似文献
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通过总结福建省第四地质大队近年来三都澳海上钻探施工技术,阐述了海相沉积的各种较复杂地层的钻进工艺,以及海上钻探的导向护孔、跟管钻进、孔深丈量、安全设施等特种技术方法。 相似文献
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宁德市位于福建省东北部,其下伏软土具有典型的闽东北第四系软黏土沉积特性,独特的内湾地形又使其兼具与传统浙闽沿海软土不同的物理力学特性。本文结合海岸带地质调查结果,通过环三都澳软黏土的原位测试和室内土工试验,对宁德第四系海相软土沉积特性及物理力学性质进行了系统研究和分析,发现该海相软土具有高压缩性、高液限、高灵敏度的特征,容易受到扰动导致强度的损失,工程建设中及基础设施灾变演化中应加以注意。大量内部孔隙极度发育且亲水性强的硅藻残骸使宁德软土具有很高的比表面积,同时也是令其具备结构性的重要原因,这两点是宁德软土区别于传统软土的显著特征。 相似文献
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《China Geology》2019,2(4):522-529
In recent years, development activities have had a significant impact on the environment of the Jiaozhou Bay, China. To ensure the sustainable economic and social development of the Jiaozhou Bay area, it is necessary to strengthen corresponding control measures. The important prerequisite is to properly understand the environmental conditions laws of natural change, especially the dynamic processes of sediment and the characteristics of landform evolution. Based on the data of continuous observation at 6 stations in Jiaozhou Bay for 25 hours, the Hydrodynamic Eutrophication Model (HEM-3D) was used to simulate the sediment erosion and deposition. The results show that the maximum suspended sediment concentration in the sea area of Jiaozhou Bay is about 40 mg/L, which appears in the northwestern area of the bay top and the Cangkou watercourse area, and the low concentration is located in the area of the central Jiaozhou Bay towards the bay mouth. The suspended sediment is 6–10 mg/L. Affected by a decrease in seawater material, the direction of the prevailing current in the Jiaozhou Bay area is different from that of the sediment transport. The velocity of the flood current is higher than that of the ebb current. However, during flood tide, the flux of resuspended seafloor sediment outside and at the mouth of the bay is limited and cannot contribute significantly to the suspended sediment in the bay. During ebb tide, the resuspended sediment at the shallow-water bay head and the east and west sides spreads toward the bay mouth with the ebb current, although it extends beyond the bay through the bay mouth. The research results can provide scientific support for the Jiaozhou Bay project construction and environmental protection. 相似文献
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The estuary and coastal zone are the key areas for socio-economic development,and they are also the important channels for pollutants transported to the sea.The construction of the Jiaozhou Bay Bridge changed the hydrodynamic condition of the bay,which made the self-purification capacity of the bay weakened and the pollution in the estuary and adjacent coastal zone become more serious.In this study,55 surface sediment samples were collected from the three seriously polluted estuaries and the adjacent coastal zone of Jiaozhou Bay to comprehensively study how the benthic foraminifera response to heavy metal pollution and human engineering,and to assess the ecological risks of the bay.A total of 80 species,belonging to 42 genera,were identified in this study.The results showed that Cu,Pb,Cr,Hg,Zn,and As had low to median ecological risks in the study area which would definitely affect the ecological system.The construction of the Jiaozhou Bay Bridge has resulted in pollutants accumulated at the river mouth of Loushan River,which has adverse effects on the survival and growth of benthic foraminifera.The lowest population density and diversity as well as the highest FAI(Foraminiferal Abnormality Index)and FMI(Foraminiferal Monitoring Index)occurred at Loushan River Estuary which indicated that the ecological environment of the northeastern part of Jiaozhou Bay(Loushan River Estuary)had been seriously damaged.Licun River and Haipo River estuaries and the adjacent coastal zone were slightly polluted and had low ecological risk.As a consequence,it suggested that the supervision of industrial and domestic waste discharge and the protection of the ecological environment in northeast Jiaozhou Bay should be paid more attention. 相似文献
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太湖生态环境演化及其原因分析 总被引：42，自引：10，他引：32
太湖地处长江下游三角洲,水域面积为2338km2,平均水深1.9m,最大水深不足2.6m,为一典型的大型浅水湖泊。太湖流域地势平坦,河网密布,河湖水力关系复杂。其主要补给径流来自西南部的天目山区及西部的宜溧河流域。每年夏天,大部分入湖洪水通过位于东太湖的太浦河及东北部的望虞河分别排入黄浦江与长江,由于出入湖河道的特殊位置,使得太湖南部的换水周期较短而北部较长。近几十年来,太湖由于污染而逐步呈现富营养化特征,污染物主要来自北部的无锡市和常州市,通过河道排入太湖北部的五里湖与梅梁湾,因此上述两地的水质较南部差。在东太湖,水产养殖对水环境的影响很大,亦呈现出富营养化特征,并殃及该地区的供水,加之该地区为太湖主要的泄洪通道,因此泥沙淤积严重,而且水生植物生长旺盛,呈现出明显的沼泽化趋势;在太湖四周地区,由于湖泊围垦和水利工程建设,其污染净化能力将降低,从而加速水环境恶化的趋势。太湖所面临这些问题,有待于强化湖泊科学管理来解决。 相似文献
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太湖地处长江下游三角洲,水域面积为2338km2,平均水深1.9m,最大水深不足2.6m,为一典型的大型浅水湖泊。太湖流域地势平坦,河网密布,河湖水力关系复杂。其主要补给径流来自西南部的天目山区及西部的宜溧河流域。每年夏天,大部分入湖洪水通过位于东太湖的太浦河及东北部的望虞河分别排入黄浦江与长江,由于出入湖河道的特殊位置,使得太湖南部的换水周期较短而北部较长。近几十年来,太湖由于污染而逐步呈现富营养化特征,污染物主要来自北部的无锡市和常州市,通过河道排入太湖北部的五里湖与梅梁湾,因此上述两地的水质较南部差。在东太湖,水产养殖对水环境的影响很大,亦呈现出富营养化特征,并殃及该地区的供水,加之该地区为太湖主要的泄洪通道,因此泥沙淤积严重,而且水生植物生长旺盛,呈现出明显的沼泽化趋势;在太湖四周地区,由于湖泊围垦和水利工程建设,其污染净化能力将降低,从而加速水环境恶化的趋势。太湖所面临这些问题,有待于强化湖泊科学管理来解决。 相似文献