气候变化领域集成服务门户(CCPortal): Global rates and patterns of channel migration in river deltas

CCPortal

DOI	10.1073/pnas.2103178118
	Global rates and patterns of channel migration in river deltas
	Jarriel T.; Swartz J.; Passalacqua P.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:46
英文摘要	River deltas are dynamic systems whose channels can widen, narrow, migrate, avulse, and bifurcate to form new channel networks through time.With hundreds of millions of people living on these globally ubiquitous systems, it is critically important to understand and predict how delta channel networks will evolve over time. Although much work has been done to understand drivers of channel migration on the individual channel scale, a globalscale analysis of the current state of delta morphological change has not been attempted. In this study, we present a methodology for the automatic extraction of channel migration vectors from remotely sensed imagery by combining deep learning and principles from particle image velocimetry (PIV). This methodology is implemented on 48 river delta systems to create a global dataset of decadal-scale delta channel migration. By comparing delta channel migration distributions with a variety of known external forcings, we find that global patterns of channel migration can largely be reconciled with the level of fluvial forcing acting on the delta, sediment fluxmagnitude, and frequency of flood events. An understanding of modern rates and patterns of channel migration in river deltas is critical for successfully predicting future changes to delta systems and for informing decision makers striving for deltaic resilience. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Channel migration; Coastal morphodynamics; Global change; River deltas
语种	英语
scopus关键词	article; controlled study; deep learning; extraction; global change; human; human experiment; imagery; particle image velocimetry; river; sediment
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238596
作者单位	Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78758, United States; Center for Water and the Environment, University of Texas at Austin, Austin, TX 78758, United States
推荐引用方式 GB/T 7714	Jarriel T.,Swartz J.,Passalacqua P.. Global rates and patterns of channel migration in river deltas[J],2021,118(46).
APA	Jarriel T.,Swartz J.,&Passalacqua P..(2021).Global rates and patterns of channel migration in river deltas.Proceedings of the National Academy of Sciences of the United States of America,118(46).
MLA	Jarriel T.,et al."Global rates and patterns of channel migration in river deltas".Proceedings of the National Academy of Sciences of the United States of America 118.46(2021).