埕岛海域自然地质环境对海上构筑物的响应分析研究_龚良平.docx
![资源得分’ title=](/images/score_1.gif)
![资源得分’ title=](/images/score_1.gif)
![资源得分’ title=](/images/score_1.gif)
![资源得分’ title=](/images/score_1.gif)
![资源得分’ title=](/images/score_05.gif)
《埕岛海域自然地质环境对海上构筑物的响应分析研究_龚良平.docx》由会员分享,可在线阅读,更多相关《埕岛海域自然地质环境对海上构筑物的响应分析研究_龚良平.docx(63页珍藏版)》请在得力文库 - 分享文档赚钱的网站上搜索。
1、 谨以此论文献给曹立华教授 龚良平 埕岛海域自然地质环境对海上构筑物的响应分析研究 独创声明 本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的 研究成果。据我所知,除了文中特别加以标注和致谢的地方外,论文中不包含其 他人已经 发 表 或 撰 写 过 的 研 究 成 果 , 也 不 包 含 未 获 得 (注:如没有其他需要特别声明的,本栏可空) 或其他教育机构的学位或证书伸 用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明 确的说明并表示谢意。 本学位论文作者完全了解学校有关保留、使用学位论文的规定,有权保留并 向国家有关部门或机构送交论文的复印件和磁盘,允
2、许论文被查阅和借阅。本人 授权学校可以将学位论文的全部或部分内容编入有关数据库进行检索,可以采用 影印、缩印或扫描等复制手段保存、汇编学位论文。同时授权中国科学技术信息 研究所将本学位论文收录到中国学位论文全文数据库,并通过网络向社会公 众提供信息服务。(保密的学位论文在解密后适用本授权书) 学位论文版权使用授权书 埕岛海域自然地质环境对海上构筑物的响应分析研究 摘要 为了解埕岛海域自然地质环境对海上构筑物的响应关系,本文通过高分辨 率的侧扫声纳、浅地层剖面及单波束测深仪等声学仪器对该海区进行勘杳,并结 合大量的井场资料、现场和室内实验分析。近几十年来,海浪对海岸线冲蚀越来 越严重,对周围的海
3、洋工程设施造成重大的安全威胁。认识人工构筑物与自然地 质环境变化的关系,研究海岸线及周边海域在人工构筑物的动力响应,对研究油 田钻井平台、海底管线、电缆等人工构筑物对海岸冲刷淘蚀作用以及保护油田设 施具有重要的实际意义。 埕岛海区在区域自然地质环境作用下,水深呈现逐渐增大的趋势,整体上埕 岛海区的冲淤环境处于冲淤调整状态,长期的调整趋势使该海区的水 下岸坡坡度 逐渐减小。埕岛海区的海底冲淤变化规律是开始时由于黄河改道原因以快速冲刷 作用为主,然后逐渐进入缓慢冲刷阶段,最后形成以冲刷为主的冲淤调整期。影 响埕岛海区海底地形变化的地质作用主要表现形式有废弃三角洲的冲蚀作用和 海底不稳定性地质作用。
4、海底不稳定地质作用的主要方式表现为海底的塌陷凹 坑、沉积物碎屑流和局部的滑坡与崩塌。 随着胜利油田海上石油的开发,在埕岛海域兴建了大量人工构筑物,如石油 平台、海底石油管线、海底电缆等等,其中石油平台的桩柱部分对自然地质环境 的影响最为强烈。分析认为,石油平台的修 建会对影响其周围的海底地形,石油 平台的桩柱的存在,打破了原有的水动力条件环境,造成二次涡旋,在波浪和潮 流共同作用下,对海底的地形造成了冲刷,最大冲刷深度可达 2.2m, 同时在平 台周围存在大量不稳定性地貌,例如:侵蚀洼地、蚀余凸起等;海底管线的铺设 同样也会对海底的地形造成影响,通过对管线冲刷机理的分析、实测管线路由区 不同年
5、份水深值和管线路由区的多波束图像以及浅地层剖面图像的分析解译,认 为管线对埕岛海区地形变化影响较大,海底管线的铺设,不仅改变其周围原有的 地貌、土体力学等特征,还使水动力条件更加强烈 ,泥沙更趋于起动,造成对海 底地形的冲蚀,最大冲刷深度可达 .3m, 在管线附近主要存在塌陷凹坑等不稳 定性地貌。 埕岛海域上的各式各样的海上人工构筑物群,它们对海底的影响已不再是小 范围的局部冲刷海底,而是区域性的改变埕岛海域自然地质环境,自然地质环境 同时又影响着人工构筑物的稳定性,它们之间存在着相互相成的关系。埕岛海域 大量的人工构筑物群加剧了该海域海底底床的冲刷,使其周围水深逐渐变大,水 深等值线明显凸向
6、靠岸一侧,同时,被冲蚀的海底物质在波浪潮流循环荷载的作 用 下,向人工建筑物附近海域就地填充淤积,形成浅滩,致使该处水深等值线明 显凸向海一侧,填充淤积的浅滩又对于保护该区海底管道电缆等路由工程设施的 安全具有十分重要的现实意义。 本论文定性分析自然地质环境对人工构筑物的反馈作用,不足之处是缺乏定 量的深入研究人工构筑物对自然地质环境的数值计算,到目前尚无法建立定量的 海域水深等值线变化动力模式。 关键词:埕岛海域,自然地质环境,人工构筑物,反馈作用 Response of natural geological environment to man-made structures into C
7、hengdao sea area Abstract In order to understand the response of natural geological environment to marine structure into Chengdao sea area, this paper is combining the survey data of side-scan sonar, sub-bottom profiler, the single-beam sounder and etc, same with a large number data of well site and
8、 experimentation. In recent decades, coastline was been eroded by waves more and more, and it is a big security threat to marine engineering facilities, understanding of the relationship between artificials and natural the geologierocal, studying the response of coastline or near sea to artificial s
9、tructures, are important practical significance for studying the effect of oil drilling platforms, subsea pipelines, cables and other artificial structures to coastal erosion, as well as corrosion protection of oil facilities. Under the natural geological environment in Chengdao area, the water dept
10、h will be increased gradually, the evolution law is from the status of rapid erosion, to washed into the slow phase, final dynamic equilibrium. The main geological changes form of the impact of sea bottom topography in Chengdao, have the abandoned delta of the erosion and geological instability of t
11、he seabed, geological The instability of Seabed has embodied in the ways of collapse pits for the seabed, sediment and debris flow landslides and collapsed partially. With the development of Shengli Oil, it have constructed a large number of artificial structures, such as oil platforms, undersea oil
12、 pipelines, submarine cables and others, including oil platforms which of some of the piles have very strong impact of natural geological to environmental. The result of analysis show that the construction of oil platforms will affect the surrounding seabed topography, breaking the original hydrodyn
13、amic conditions of the environment, causing the second vortex in the waves and the deepest of scour is up to 2.2m, which is under the combined effect of the trend on the seabed. At the same time, there are a large number of unstable landforms around platforms, such as: low-lying land erosion, convex
14、. The pipelines will also impact on the seabed topography. Through the analysis of the mechanism of pipeline erosion, and the depth data measured in different years and the multi-beam images, sub-bottom profiler images, it show that the pipeline have important effect on its terrain, and pipelines ar
15、e not only change its original surrounding topography and soil characteristics, but also make more intense of the hydrodynamic conditions, finally resulting the erosion of the seabed topography and the largest erosion may up to 0.3m, and there are unstable landforms such collapse pit near pipeline.
16、The influence of manmade buildings to seabed is no longer a small-local but is regional. On the other way, natural geological environment is also affecting the engineering facilities. There is a mutual relationship between each other. The lots of artificial structures increasing the effect to the se
17、abed, so that the contour map of the depth of water is clearly convex the side of the land. Another, the seabed material which had eroded, is filling sediment around the structures and forming a shallow by the circular action of tide wave. So it clear that the contour map of the depth of water near
18、here is clearly convex side of the sea, which have a great practical significance to the protection of cables and other submarine pipeline routing facilities. In this paper, there is only a qualitative analysis of the feedback effect which the geological environment to the artificial structure, ther
19、e is lack of quantitative in-depth study of the numerical calculation that the influence which artificial structures on the natural geological environment, and have not a model that quantitative calculate changes the contour map of the depth of water in Chengdao waters. Keywords: Chengdao waters; na
20、tural geological environment; man-made structures; feedback effect 目 录 齡 . 1 0. . 1研究意义 . 1 0.2 过去的研究与成果 . 1 0.3 研究内容 . 3 1 埕岛海域概况 . 5 1.1 地理位置 . 5 1.2 气象 . 6 1.2.1 气候特征 . 6 1.2.2 气温 . 6 1.2.3 风 . 6 1.3 H . 7 1.3.1 潮汐 . 7 1.3.2 波浪 . 9 1.3.3 风暴潮 . 11 1.3.4 海流 . 12 1.4 地质构造 . 13 1.4.1 概述 . 13 1.4.2 区域
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 海域 自然 地质 环境 海上 构筑物 响应 分析研究 龚良平
![提示](https://www.deliwenku.com/images/bang_tan.gif)
限制150内