| 西安高陵近代河漫滩沉积与洪水变化 |
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| 引用本文： | 赵景波,蔡晓薇,王长燕,董雯.西安高陵近代河漫滩沉积与洪水变化[J].中国沙漠,2006,26(6):885-889. |
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| 作者姓名： | 赵景波 蔡晓薇 王长燕 董雯 |
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| 作者单位： | 1. 陕西师范大学,地理系,陕西,西安,710062;中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,陕西,西安,710075;陕西师范大学,西北历史环境与经济社会发展研究中心,陕西,西安,710062
2. 陕西师范大学,地理系,陕西,西安,710062 |
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| 基金项目： | 教育部人文社会科学研究项目;陕西师范大学校科研和教改项目;国家重点实验室基金 |
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| 摘 要： | 根据高陵渭河河漫滩沉积剖面中105个样品的颗粒与有机质分析,Hg与CaCO3含量测定和史书记载的年代资料,研究了西安高陵渭河距今约120 a来河漫滩沉积指示的洪水变化。结果表明,高陵渭河约120 a来至少发生了16次大洪水, 洪水规模存在一定差别, 各次洪水一般代表了当年降水量的明显增加; 高陵渭河河漫滩沉积中有机碳浓度、金属汞的含量、CaCO3含量变化显著,它们与颗粒大小之间有明显的相关性,沉积物粒度越细,其有机碳和重金属汞的含量越高,CaCO3含量越少。有机碳和重金属汞的含量变化能够间接指示洪水动力强弱变化和短暂降水量增加。汞含量变化表明,渭河汞污染发生时间相当晚。
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| 关 键 词： | 渭河 120a来 洪水变化 洪水指标 |
| 文章编号： | 1000-694X（2006）06-0885-05 |
| 收稿时间： | 2006-07-13 |
| 修稿时间： | 2006-08-07 |
Recent Deposits on Valley Flat in Xi'an Suburb and Indicated Flood Changes of Weihe River |
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| ZHAO Jing-bo,CAI Xiao-wei,WANG Chang-yan,DONG Wen.Recent Deposits on Valley Flat in Xi''''an Suburb and Indicated Flood Changes of Weihe River[J].Journal of Desert Research,2006,26(6):885-889. |
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| Authors: | ZHAO Jing-bo CAI Xiao-wei WANG Chang-yan DONG Wen |
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| Institution: | 1.Department of Geography, Shaanxi Normal University, Xian 710062, China；2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China; 3.Center of Historical Environment and Socio-Economic Development in Northwest China of Shaanxi Normal University, Xi’an 710062, China |
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| Abstract: | The paper has analyzed on the grain size,total organic carbon(TOC) content,Hg and CaCO_(3) content of 105 samples from Weihe river deposits in Xi'an suburb,and hereby has studied the flood changes indicated by the deposit sequence over the past 120 years based on the chronology data recorded by historical books.Over the past 120 years there were at least 16 times big floods occurred in the study region,and their scales were different,which reflected the various amount of precipitation.The TOC,Hg and CaCO_3 contents change remarkably in profile,and they have close relation with the grain size variation.The finer the grain size of deposits,the higher content of TOC and Hg,and the less CaCO_(3)content.The changes of TOC and Hg contents can indirectly indicate the flood power change and the short precipitation increase.Besides,the Hg content change indicates that the Hg pollution in Weihe River occurred in relatively modern period. |
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| Keywords: | Weihe river past 120 years flood change flood indexes |
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