干旱区生态环境知识资源中心(Arid): Entropy model to assess sediment resuspension probability and trap efficiency of small dams

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DOI	10.1016/j.ijsrc.2022.01.005
	Entropy model to assess sediment resuspension probability and trap efficiency of small dams
	Soares Pereira, Francisco Jairo; da Silva Filho, Antonio Viana; Batista Lopes, Jose Wellington; de Araujo, Jose Carlos
通讯作者	de Araújo, JC
来源期刊	INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
ISSN	1001-6279
出版年	2022
卷号	37 期号:5 页码:675-686
英文摘要	In the Brazilian drylands, there are tens of thousands of small dams. Despite their paramount importance to the rural population, they are rarely monitored. Water demand increases with time while, simultaneously, siltation reduces reservoir water capacity and availability. Reservoir siltation models are, therefore, mandatory to manage the numerous ungauged small dams in these drylands. The objective of the current study is to improve sediment trap efficiency (TE) modeling by including resuspension as a key probabilistic process. The Shannon entropy was used to estimate the sediment resuspension probability, which was merged with the Camp model and generated the RETSED entropy model. To validate the RETSED model, an experimental check dam (ECD, 300 m(3)), located in the Gilbues desertification site, Brazil, was monitored hourly during one hydrological year (July 2018-July 2019). Measurements show that the annual volumetric decline of the check dam was 12%; and that the average trap efficiency equaled 86%. Only 9.5% of the hourly sediment concentration outflow exceeded the average plus one standard deviation, showing that the reservoir is well mixed; a fact which highlights the relevance of the resuspension process. Three empirical models failed to mimic the experimental results: Churchill (TE = 99%), Brune (TE = 75%), and Maryland ( TE = 94%). According to the RETSED entropy model, the resuspension probability during the experiment was 10% and TE = 81%, a value only 6% below the measured one. The Camp model simulated TE = 89%, only 3% higher than the measured value, but confirmed the Camp model's tendency to overestimate TE due to a disregard of resuspension. The deterministic model showed low sensitivity concerning the hydrodynamic effects, whereas the entropy formulation proved to be more consistent with physical behavior: the resuspension probability clearly increased and trap efficiency decreased with rising reservoir discharge. (c) 2022 International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research. Published by Elsevier B.V. All rights reserved.
英文关键词	Erosion Check dam Sedimentation Ungauged basins Camp model
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000823397900011
WOS关键词	SOIL-EROSION ; CHECK-DAMS ; VELOCITY DISTRIBUTION ; RESERVOIR SILTATION ; INFORMATION-THEORY ; SETTLING VELOCITY ; YIELD ; CATCHMENT ; BASIN ; FLOW
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393212
推荐引用方式 GB/T 7714	Soares Pereira, Francisco Jairo,da Silva Filho, Antonio Viana,Batista Lopes, Jose Wellington,et al. Entropy model to assess sediment resuspension probability and trap efficiency of small dams[J],2022,37(5):675-686.
APA	Soares Pereira, Francisco Jairo,da Silva Filho, Antonio Viana,Batista Lopes, Jose Wellington,&de Araujo, Jose Carlos.(2022).Entropy model to assess sediment resuspension probability and trap efficiency of small dams.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,37(5),675-686.
MLA	Soares Pereira, Francisco Jairo,et al."Entropy model to assess sediment resuspension probability and trap efficiency of small dams".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 37.5(2022):675-686.