干旱区生态环境知识资源中心(Arid): 祁连山疏勒河上游基流变化及其影响因素分析

Arid

	祁连山疏勒河上游基流变化及其影响因素分析
其他题名	Variation of the base flow and its causes in the upper reaches of the Shule River in the Qilian Mountains
	董薇薇; 丁永建; 魏霞
来源期刊	冰川冻土
ISSN	1000-0240
出版年	2014
卷号	36 期号:3 页码:661-669
中文摘要	基流是河川径流的重要组成部分,也是干旱半干旱地区最重要的枯季水文特征之一.基流在维持河川径流和维护河流湖泊生态等方面具有重要意义.基于祁连山疏勒河上游出山口控制水文站昌马堡站1954-2009年的日径流资料,采用递归数字滤波法和平滑最小值法对日径流进行基流分割,对比分析基流和基流指数BFI的变化特征,并从气温和降水两方面探讨基流变化的主要影响因素.结果表明:两种方法的计算结果有差异,但平滑最小值法更适用于研究区.疏勒河上游多年平均基流量为6.07*10~8m~3,基流变化总体上呈上升趋势,进入21世纪以后基流量增加最为显著.研究区多年平均基流指数为0.66,基流指数的年际变化相对比较稳定,但年内波动幅度较大.在长时间尺度上,降水是基流变化的主要影响因素,降水量的增加在一定程度上影响了基流和基流指数的变化.在全球变暖的背景下,气温升高导致冰雪融水的增加和冻土的退化,间接的影响了基流的变化.
英文摘要	As an important component of runoff, base flow is one of the most important hydrological characteristics in dry season in arid and semi-arid regions. Base flow has significant in maintaining runoff and preserving ecological environment of rivers and lakes. Based on daily runoff data from 1954 to 2009 in the upper reaches of the Shule River, the recursive digital filter and smoothed minimum method were used for base flow separation. The features of variation in base flow and base flow index, as well as the main controlling factors (temperature and precipitation), were investigated. It is found that there is a difference between the calculation results from the two methods, but the smoothed minimum method is more suitable for the study area. The average annual base flow is 6.07*10~8 m~3.As a whole, the base flow is increasing in the upper reaches of the river, similar to runoff, especially in the period of early 21st century. The base flow index is 0.66 in the study area, which is relatively stable, but whose fluctuating range is great throughout the year. In a long term, precipitation is a major influence factor to the change in base flow and base flow index. Under the background of global warming, rising temperature leads to increase snow melt and permafrost degradation, which will be increasing the supply to base flow.
中文关键词	基流 ; 基流指数 ; 疏勒河上游 ; 气候变化 ; 祁连山
英文关键词	base flow base flow index upper reaches of the Shule River climate change Qilian Mountain
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
WOS研究方向	Geology
CSCD记录号	CSCD:5204091
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230800
作者单位	董薇薇, 兰州大学资源环境学院, 兰州, 甘肃 730000, 中国.; 魏霞, 兰州大学资源环境学院, 兰州, 甘肃 730000, 中国.; 丁永建, 中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室, 兰州, 甘肃 730000, 中国.
推荐引用方式 GB/T 7714	董薇薇,丁永建,魏霞. 祁连山疏勒河上游基流变化及其影响因素分析[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2014,36(3):661-669.
APA	董薇薇,丁永建,&魏霞.(2014).祁连山疏勒河上游基流变化及其影响因素分析.冰川冻土,36(3),661-669.
MLA	董薇薇,et al."祁连山疏勒河上游基流变化及其影响因素分析".冰川冻土 36.3(2014):661-669.