干旱区生态环境知识资源中心(Arid): Using multiple composite fingerprints to quantify source contributions and uncertainties in an arid region

Arid

DOI	10.1007/s11368-019-02424-1
	Using multiple composite fingerprints to quantify source contributions and uncertainties in an arid region
	Niu, Baicheng 1,2; Zhang, Xunchang (John)3; Qu, Jianjun1 ; Liu, Benli 1; Homan, Joel 3; Tan, Lihai 1; An, Zhishan 1
通讯作者	Liu, Benli
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2020
卷号	20 期号:2 页码:1097-1111
英文摘要	Purpose Developing targeted protection measures at a watershed scale requires spatially distributed information of sediment sources. Therefore, the objectives of this study are to (1) test and evaluate the ability of multiple composite fingerprints (MCF) to quantify sediment provenance using multiple particle size classes in an arid region; (2) quantify uncertainty of the estimated proportional contributions of sediment sources; and (3) provide decision support information for sediment control in the Danghe Reservoir Watershed. Materials and methods In total, 66 samples were collected from north alluvial fan, south alluvial fan, and high mountains, and all samples were divided into six particle size groups. A multistep test was used to remove the tracers that were non-conservative, unable to differentiate sources, or highly variable within a source. Based on geochemical properties of distributed source samples and a linear mixing model, a MCF method with multiple particle size tracking was used to estimate proportions of three potential source contributions. More importantly, the uncertainty of sediment source contributions was quantified using the Gaussian first-order approximation. Results and discussion The results showed that the MCF method with multiple particle size tracking could obtain relatively accurate estimates of the contributions with an overall mean absolute relative error of 3.5% and a relatively narrow 95% confidence interval. The major contributions were consistently coming from the high mountains for all six particle groups. During these runoff events, the overall estimated mean proportions were 49.0%, 26.5%, and 24.5% from the high mountains, south alluvial fan, and north alluvial fan, respectively. Furthermore, the Gaussian first-order approximation revealed that more than 60% of the total uncertainty contribution was a byproduct of the downstream sediment mixture, while each individual sediment source produced less than 15% of the absolute uncertainty. Conclusions Acquiring watershed scale sediment source information is challenging and the MCF method proved accurate. A majority of the contribution uncertainties were associated with the downstream sediment mixture, which is because the sediment sink inherited both spatial and temporal variations of all contributing sources. Consequently, a larger sample size is recommended for sediment mixtures, compared to each sediment source, in order to increase the accuracy of the source proportion estimation.
英文关键词	Arid region Multiple composite fingerprints Sediment provenance Uncertainty analysis
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000513281900047
WOS关键词	IDENTIFYING SEDIMENT SOURCES ; RIVER BANK EROSION ; GULLIED CATCHMENT ; PROVENANCE ; RESERVOIR ; MANAGEMENT ; DEPOSITION
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315074
作者单位	1.NW Inst EcoEnvironm, Chinese Acad Sciences,Key Lab Desert, Dunhuang Gobi Desert Res Stn,Desertificat, Resources, Lanzhou, Peoples R China; 2.Univ Chinese Acad Sciences, Beijing, Beijing, Peoples R China; 3.United States Dept Agr, Agr Res Serv, Grazinglands Res Lab, El Reno, OK 73036 USA
推荐引用方式 GB/T 7714	Niu, Baicheng,Zhang, Xunchang ,Qu, Jianjun,et al. Using multiple composite fingerprints to quantify source contributions and uncertainties in an arid region[J],2020,20(2):1097-1111.
APA	Niu, Baicheng.,Zhang, Xunchang .,Qu, Jianjun.,Liu, Benli.,Homan, Joel.,...&An, Zhishan.(2020).Using multiple composite fingerprints to quantify source contributions and uncertainties in an arid region.JOURNAL OF SOILS AND SEDIMENTS,20(2),1097-1111.
MLA	Niu, Baicheng,et al."Using multiple composite fingerprints to quantify source contributions and uncertainties in an arid region".JOURNAL OF SOILS AND SEDIMENTS 20.2(2020):1097-1111.