灾害学2017，Vol.32Issue(3)：23-28,6.DOI:10.3969/j.issn.1000-811X.2017.03.005
西安周至渭河漫滩沉积特征与洪水变化
Change of Flood and Sedimentary Characteristics of Floodplain in Zhouzhi Reach of the Weihe River
摘要
Abstract
The purpose of the study is to reveal the causes,characteristics and regularity of the flood in Zhouzhi rearch of the Weihe River during last 120 years.Methods of field investigation,regional comparison and grain-size analysis are used.The floodplain sediment of ZZ1 profile in study area formed during the past 120 years.It's thickness is 2.2m and can be divided into 14 layers.It indicates that 14 flood events occurred during the past 120 years.The grain size of ZZ1 profile is larger than that in the lower reaches of Weihe River owning to its major components of coarse and medium sand except 30cm of silt and clay at the top.Coarse sand content is generally between 50％ and 65％,and medium sand content is between 15％ and 30％.The larger grain size indicates the stronger flood at the forming stage.The depth and scale of the 14 flood events in ZZ1 profile is in the order of 9th ＞ 5th ＞ 6th ＞ 4th ＞ 7th ＞ 3rd ＞ 14th ＞ 8th ＞ 1st ＞ 10th ＞ llth ＞ 13th ＞ 12th ＞ 2nd.The flood events were caused by the strong summer monsoon and an annual precipitation that was increased to 800-900mm then.关键词
河漫滩沉积/粒度组成/洪水事件/洪水成因/周至渭河Key words
floodplain sediment/grain-size distribution/flood events/causes of flood/Zhouzhi rearch of the Weihe River分类
资源环境引用本文复制引用
赵景波,罗小庆,黄小刚,马延东..西安周至渭河漫滩沉积特征与洪水变化[J].灾害学,2017,32(3):23-28,6.基金项目
中国地质调查局西安地质调查中心项目“关中盆地第四系形成与演化”(水[2016](4)) （水[2016](4）
中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG1626) （SKLLQG1626）
