夏波-毕业设计(张玉芬修改2).doc

本科毕业论文（设计） 题目：武汉地区末次冰盛期以来古洪水与古气候关系研究 姓 名： 夏波 学号： 20111003726 院（系）： 地球物理与空间信息学院 专业： 地球物理学 指导教师： 张玉芬 职称： 教授 2015 年 5 月 摘要 广泛发育的河湖相沉积是古洪水研究的良好载体，也是古气候研究难得的材料，所以开展古洪水与气候的关系研究，对未来气候变化背景下的洪水发展趋势预测也具有重要的实际意义。而沉积物就是研究古洪水的载体，其中磁化率和粒度参数更是反映沉积物重要标志。 磁化率是物质被磁化难易程度的一种度量。根据实测数据,对磁化率与粒度、矿物之间的关系进行了探讨。结果表明,沉积物粒度与磁化率的关系,与物源及沉积动力密切相关。因此,在一定条件下,可利用两者关系来反映物源或沉积动力，进而来判断古洪水发生的特征。 本研究拟通过对武汉后湖和船厂湖末次冰盛期的sk10孔沉积物磁学特征的分析研究，结合钻孔资料，并对体积磁化率和频率磁化率系数特征、粒度参数特征与岩性特征的相关性进行比较，建立气候演化和洪水过程的耦合机理。最后得到长江中游大洪水与区域及全球气候变化的响应，为未来全球变化背景下，长江武汉段大洪水的趋势预测提供参考。同时为武汉市湖相软土层地质灾害的治理提供地学资料。 关键词：武汉后湖和船厂湖 磁化率 粒度 古洪水 古气候 （摘要偏短）可将得到的研究认识与结论在摘要中体现Abstract Extensive development of lacustrine deposition is a good indicator of the ancient flood research, is a rare ancient climate research material, so the research on the ancient flood and the relationship between climate, under the background of climate change in the future development trend of flood forecast also has important practical significance.And sediment is the carrier of the ancient flood, including magnetic susceptibility and grain size parameters. they also reflect the sediment important symbol. Magnetic susceptibility which is the ease of magnetization of the material is a kind of measurement. According to the measured data, the relationship between magnetic susceptibility and grain size, mineral, will be discussed in this paper. The results show that the sediment grain size and the relationship between magnetic susceptibility, is closely related to the content source and sedimentary dynamic.Under certain conditions, therefore, it is available to reflect the sedimentary dynamic source or the relationship, and then to determine the characteristics of the ancient floods. Studied in this paper through the lake and shipyard after wuhan lake sk10 hole during the last glacial deposits at the end of the analysis and study of magnetism characteristic, combining with dril