摘要
利用沉积物的粒度特征可以有效地揭示河流的沉积环境和水动力条件。选取了渭河干流宝鸡市区段、清姜河、金陵河和千河4个河床沉积物的76个样品进行了粒度测量。结果表明:渭河干流,清姜河和千河沉积物主要以砂为主,金陵河以黏土为主。渭河干流、清姜河、金陵河和千河沉积物平均粒径分别为3.89Φ、3.71Φ、3.79Φ和3.56Φ,分选系数较好,偏度总体上为负偏,个别样品为正态,金陵河以正偏为主,峰度都以较窄和极窄为主,表明沉积物优势粒级突出。通过分析渭河干流与支流河床沉积物的粒度特征,揭示了渭河干流宝鸡市区段及其主要支流均属于间歇性河流,物源以上游携带和沿岸侵蚀为主,两岸支流存在部分供给;根据渭河干流宝鸡市区段的粒度特征将其划分为两段,第一段宝鸡峡到神龙大桥,第二段神龙大桥至千河入渭口。
The sedimentary environment and hydrodynamic conditions of the river can be effectively revealed by the grain size characteristics of the sediments.We selected 76 samples of riverbed sediments from Baoji section of Weihe river,Qingjiang river,Jinling river and Qian river for size measurement.The results show that the grain size of the study area is mainly composed of clay,fine sand,medium sand,coarse sand and sand.In the main stream of Weihe river,Qingjiang river and Qian river there are mainly sand,and the in the Jingling river there is clay.The grain sizes in Weihe river,Qingjiang river,Jinling river and Qian river sediments are 3.89Φ,3.71Φ,3.79Φand 3.56Φ,respectively;sorting coefficient is very good,and as a whole,skewness is negative;besides,individual samples are normal,it is partial for Jinling river;kurtosis is dominated by narrow and very narrow.It shows that predominant grain size of sediment is prominent.By analyzing the particle size characteristics of the sediment of the Weihe main stream and the tributary river bed,it is revealed that the Baoji section of the Weihe main stream and its main tributaries belong to the intermittent river,the sources are mainly from upstream carrying and coastal erosion,and partially supplied by cross-strait tributaries.
作者
张俊辉
周雄辉
康秀丽
李东兴
林青
刘滨
王彦虎
ZHANG Junhui;ZHOU Xionghui;KANG Xiuli;LI Dongxing;LIN Qing;LIU Bin;WANG Yanhu(College of Geography&Environment,Baoji University of Arts and Sciences,Baoji 721013,China;Shaanxi Key Laboratory of Disasters Monitoring&Mechanism Simulation,Baoji University of Arts and Sciences,Baoji 721013,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2019年第10期131-137,共7页
Journal of Arid Land Resources and Environment
基金
陕西省教育厅科学研究计划重点项目(17JS004)资助
关键词
渭河
沉积物
粒度特征
物源
Weihe river
sediment
characteristic of grain-size
provenance
