干旱区生态环境知识资源中心(Arid): Spatiotemporal changes of 7-day low flow in Iran's Namak Lake Basin: impacts of climatic and human factors

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DOI	10.1007/s00704-019-02959-w
	Spatiotemporal changes of 7-day low flow in Iran's Namak Lake Basin: impacts of climatic and human factors
	Sheikh, Zahra 1; Yazdani, Mohammad Reza 1; Moghaddam Nia, Alireza 2
通讯作者	Yazdani, Mohammad Reza
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
ISSN	0177-798X
EISSN	1434-4483
出版年	2020
卷号	139 期号:1-2 页码:57-73
英文摘要	Low flow is very sensitive to climate change and human intervention, especially in arid regions. In this study, changes of the 7-day low flow along the most important rivers of Iran's Namak Lake Basin were investigated using nonparametric (Mann-Kendall and modified-Mann-Kendall) tests. A significant diminishing trend was observed in 72.2% of stations during the period of 1970-2012. The northern part of the basin lacked a significant trend, while in other parts of the basin, the descending trend was distributed uniformly. On the other hand, the changes of the annual rainfall during this period showed no clear trend (a significant trend in 36% and non-significant trend in 64% of stations), and the identified pattern of its changes was complicated on the basin scale and during the year. On a monthly scale, a significant decreasing trend was observed in March as one of the most productive months of the year in 49% of the stations. In addition, rainfall reduction was significant (over 35%) over the past 15 years in more than 71% of the stations. Also, changes in the proportion of seasonal rainfall and rainfall regime were considerable. The share of winter and spring rainfall showed a diminishing trend in 90% and 82% of stations, respectively. Also, rainfall regime based on precipitation concentration index (PCI) revealed a tendency to disorder (in 53% of stations). The annual temperature and temperature of October and February indicated a strong ascending trend in 92%, 71%, and 64% of stations, respectively, which can be effective during snow melting in basins with snow-rainy regimes and increasing evapotranspiration. Groundwater level changes also showed that, in the studied plains, the average water table drawdown was between 0.31 and 1.33 m/year. Therefore, the observed trend of low flow rates in this basin reflects the impact of climate change, where both direct and indirect human interference has led to the exacerbation of this situation.
类型	Article
语种	英语
国家	Iran
收录类别	SCI-E
WOS记录号	WOS:000511515200005
WOS关键词	STREAMFLOW TRENDS ; RIVER ; VARIABILITY ; PRECIPITATION
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315656
作者单位	1.Semnan Univ, Fac Desert Studies, Dept Combat Desertificat, Semnan, Iran; 2.Univ Tehran, Fac Nat Resources, Dept Rehabil Arid & Mountainous Reg, Karaj, Iran
推荐引用方式 GB/T 7714	Sheikh, Zahra,Yazdani, Mohammad Reza,Moghaddam Nia, Alireza. Spatiotemporal changes of 7-day low flow in Iran's Namak Lake Basin: impacts of climatic and human factors[J],2020,139(1-2):57-73.
APA	Sheikh, Zahra,Yazdani, Mohammad Reza,&Moghaddam Nia, Alireza.(2020).Spatiotemporal changes of 7-day low flow in Iran's Namak Lake Basin: impacts of climatic and human factors.THEORETICAL AND APPLIED CLIMATOLOGY,139(1-2),57-73.
MLA	Sheikh, Zahra,et al."Spatiotemporal changes of 7-day low flow in Iran's Namak Lake Basin: impacts of climatic and human factors".THEORETICAL AND APPLIED CLIMATOLOGY 139.1-2(2020):57-73.