地表过程研究

长江上游全新世特大洪水对西南季风变化的响应

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  • 徐州师范大学城市与环境学院, 江苏 徐州 221116
葛兆帅(1971-),男,副教授。主要从事自然地理教学与科研。 E-mail:gezhaoshuai@163.com

收稿日期: 2008-06-15

  修回日期: 2009-03-09

  网络出版日期: 2009-05-25

基金资助

高等学校博士点专项科研基金项目 (20060284028);徐州师范大学科研启动基金资助 (KY2005001)

The response of Holocene extreme floods in the Upper Changjiang River to changes of southwest monsoon

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  • School of Urban and Environmental Sciences, Xuzhou Normal University, Xuzhou 221116, China

Received date: 2008-06-15

  Revised date: 2009-03-09

  Online published: 2009-05-25

Supported by

高等学校博士点专项科研基金项目 (20060284028);徐州师范大学科研启动基金资助 (KY2005001)

摘要

利用24次全新世特大洪水序列与川渝地区近两千年的洪灾史料,对长江上游特大洪水事件和气候变化的响应机制进行了分析。从长江上游特大洪水序列与阿拉伯海记录的西南季风气候变化对比分析来看,特大洪水事件与西南季风变化具有很好的响应关系,特大洪水事件多发生于西南季风较弱的阶段,这些阶段以西南季风气候快速变化为特征,是气候剧烈波动期或气候的转型期。与北大西洋、贵州董歌洞石笋所记录的气候变化比较,特大洪水有的与全新世气候突变一致,有的则不一致,可能特大洪水事件更多表现为地方事件。与文献记载的历史洪灾事件相比,长江上游低频高量级的特大洪水事件对西南季风的变化具有更好的响应关系,而高频低量级的洪灾事件具有更高的随机性,由于历史文献记载的洪水量级差异较大,如果将他们笼统地放在一起分析,可能会掩盖洪水事件对气候变化响应机制。

本文引用格式

葛兆帅 . 长江上游全新世特大洪水对西南季风变化的响应[J]. 地理研究, 2009 , 28(3) : 592 -600 . DOI: 10.11821/yj2009030004

Abstract

Exploring the relationship between extreme floods in the Upper Changjiang River (UCR) and the southwest (SW) monsoon is of important theoretical and practical significance by means of the floods peak discharge. The climatic background of the extreme floods in the UCR was analyzed in this paper by recurring to 24 extreme Holocene floods and flood disaster data during the last 2000 years in Sichuan-Chongqing area. Summer SW monsoon is the main sources of precipitation in UCR. The flood caused by violent storm is the major flood type in UCR. The extreme floods in the UCR are related to the abnormal enhancement of SW monsoon. The analogism was employed for exploring the response of extreme floods to the Holocene climate change. The Holocene climate change information recorded in North Atlantic Ocean drilling core, Dongge stalagmite, Arabian sea drilling core and other proxies were used for analyzing the subjects. Based on the analysis of the relationship between the series of extreme floods in the UCR and the SW monsoon change during Holocene recorded by the marine core in the Arabian Sea, the extreme floods were greatly consistent with the SW monsoon change. The extreme floods event period during Holocene, characterized by the rapid climate change, were mostly the stage of strong climatic fluctuation or the climatic transition period. In comparison of the extreme floods to the climate change recorded in the North Atlantic Ocean, all the extreme flood periods are not consistent with the rapid climate change, which is similar to the scenario of the stalagmite in Dongge Cave in Guizhou Province. It is indicated that the flood event affected by the hydrologic-meteorologic process tended to be a local event. Compared with the flood disasters recorded in historical documents, the extreme floods with greater peak discharge and low frequency responded to the climate change very well, whereas the floods with small peak discharge and low frequency were more random. There were great differences in magnitude of historical floods recorded in documents. Therefore we should do analyses to distinguish these events based on the data rather than mix them up. The latter may cover up the true mechanism of the extreme floods and their responses to the climate change.

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