DOI: 10.1002/2016GL070519
论文题名: How much subsidence is enough to change the morphology of river deltas?
作者: Liang M. ; Kim W. ; Passalacqua P.
刊名: Geophysical Research Letters
ISSN: 0094-8525
EISSN: 1944-8256
出版年: 2016
卷: 43, 期: 19 起始页码: 10266
结束页码: 10276
语种: 英语
英文关键词: numerical modeling
; river deltas
; rule-based model
; subsidence
Scopus关键词: Locks (fasteners)
; Numerical models
; Stratigraphy
; Field observations
; Locking mechanism
; Numerical experiments
; Physical experiments
; River deltas
; Rule-based models
; Stratigraphic records
; Threshold transitions
; Subsidence
英文摘要: Understanding the effect of subsidence on fluviodeltaic morphology is important not only to maintain sustainable coastal cities and habitats but also to interpret the information contained in the stratigraphic record. While tectonic steering in alluvial environments has been investigated, similar studies in fluviodeltaic environments are limited to physical experiments and field observations. We perform numerical experiments with a parcel-based cellular model to analyze the deltaic surface and subsurface responses to regional subsidence. We quantify model results using robust metrics and show that while sediment partitioning and shoreline pattern vary gradually with increasing subsidence rate, channel mobility and stratigraphic connectivity of channel deposits show a threshold transition. Conditions for this transition are captured with a dimensionless filling index β, defined as the ratio between the rates of accommodation creation and sediment supply. A channel-locking mechanism activates when β exceeds 0.6 and is responsible for the threshold transition. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991075809&doi=10.1002%2f2016GL070519&partnerID=40&md5=c29ed38d48e90560639e9980be5d96f9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9488
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil, Architectural and Environmental Engineering, Center for Research in Water Resources, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Liang M.,Kim W.,Passalacqua P.. How much subsidence is enough to change the morphology of river deltas?[J]. Geophysical Research Letters,2016-01-01,43(19).