DOI: 10.1073/pnas.1909572117
论文题名: The role of saltwater and waves in continental shelf formation with seaward migrating clinoform
作者: Iwasaki T. ; Parker G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 3 起始页码: 1266
结束页码: 1273
语种: 英语
英文关键词: Continental shelves
; Dissolved salt
; Hypopycnal flows
; Mud belts
; Wave base
Scopus关键词: river water
; salt water
; algorithm
; Article
; chemical reaction
; coastal plain
; continental shelf
; geographic and geological phenomena
; hydrodynamics
; priority journal
; sediment transport
; slope factor
; surface wave
; turbidity
; water flow
英文摘要: Continental shelves have generally been interpreted as drowned coastal plains associated with the allogenic effect of sea-level variation. Here, without disputing this mechanism we describe an alternative autogenic mechanism for subaqueous shelf formation, driven by the presence of dissolved salt in seawater and surface waves. We use a numerical model describing flow hydrodynamics, sediment transport, and morphodynamics in order to do this. More specifically, we focus on two major aspects: 1) the role of saltwater in the subaqueous construction of continental shelves and 2) the transformation of these shelves into seaward-migrating clinoforms under the condition of repeated pulses of water and sediment input and steady wave effects, but no allogenic forcing such as sea-level change. In the case for which the receiving basin contains fresh water of the same density as the sediment-laden river water, the hyperpycnal river water plunges to form a turbidity current that can run out to deep water. In the case for which the receiving basin contains sea water but the river contains sedimentladen fresh water, the hypopycnal river water forms a surface plume that deposits sediment proximally. This proximate protoshelf can then grow to wave base, after which wave-supported turbidity currents can extend it seaward. The feature we refer to is synonymous with near-shore mud belts. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164362
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Iwasaki, T., Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan; Parker, G., Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States, Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
Recommended Citation:
Iwasaki T.,Parker G.. The role of saltwater and waves in continental shelf formation with seaward migrating clinoform[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(3)