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	Changes in Lena River streamflow hydrology: Human impacts versus natural variations
	Ye, BS; Yang, DQ; Kane, DL
刊名	WATER RESOURCES RESEARCH
	2003-07-31
卷号	39期号:7页码:14
关键词	streamflow change Lena River climate impact human influence
ISSN号	0043-1397
DOI	10.1029/2003WR001991
通讯作者	Ye, BS()
英文摘要	This study systematically analyzes long-term (1936-1999) monthly discharge records for the major subbasins within the Lena River watershed in order to document significant streamflow hydrology changes induced by human activities (particularly reservoirs) and by natural variations/ changes. The results show that the upper streams of the watershed, without much human impact, experience a runoff increase in winter, spring, and (particularly) summer seasons and a discharge decrease in fall season. These changes in seasonal streamflow characteristics indicate a hydrologic regime shift toward early snowmelt and higher summer streamflow perhaps due to regional climate warming and permafrost degradation in the southern parts of Siberia. The results also demonstrate that reservoir regulations have significantly altered the monthly discharge regime in the lower parts of Lena River basin. Because of a large dam in west Lena River, summer (high) flows at the outlet of the Vilui valley have been reduced by up to 55% and winter (low) flows have been increased by up to 30 times. These alterations, plus streamflow changes in the upper Lena regions, lead to strong upward trends (up to 90%) in monthly discharge at the basin outlet during the low-flow months and weak increases (5-10%) in the high-flow season. Monthly flow records at the basin outlet have been reconstructed by a regression method to reduce reservoir impacts. Trend analyses and comparisons between the observed and reconstructed monthly flows show that because of reservoir regulations, discharge records observed at the Lena basin outlet do not always represent natural changes and variations. They tend to underestimate the natural runoff trends in summer and overestimate the trends in both winter and fall seasons. Therefore the cold season discharge increase identified at the mouth of the Lena basin is not all naturally caused, but the combined effect of reservoir regulation and natural runoff changes in the unregulated upper subbasins. This study clearly illustrates the importance of human activities in regional and global environment changes and points to a need to examine human impacts in other large high-latitude watersheds.
收录类别	SCI
WOS关键词	CLIMATE-CHANGE ; WATER-BALANCE ; GLOBAL RIVERS ; PEACE-RIVER ; SEA ICE ; DISCHARGE ; CANADA ; SYSTEMS ; RUNOFF ; WORLD
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS类目	Environmental Sciences ; Limnology ; Water Resources
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000184712200003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556932
专题	寒区旱区环境与工程研究所
通讯作者	Ye, BS
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 2.Univ Alaska Fairbanks, Water & Environm Res Ctr, Fairbanks, AK 99775 USA
推荐引用方式 GB/T 7714	Ye, BS,Yang, DQ,Kane, DL. Changes in Lena River streamflow hydrology: Human impacts versus natural variations[J]. WATER RESOURCES RESEARCH,2003,39(7):14.
APA	Ye, BS,Yang, DQ,&Kane, DL.(2003).Changes in Lena River streamflow hydrology: Human impacts versus natural variations.WATER RESOURCES RESEARCH,39(7),14.
MLA	Ye, BS,et al."Changes in Lena River streamflow hydrology: Human impacts versus natural variations".WATER RESOURCES RESEARCH 39.7(2003):14.

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