Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077936 |
Wave Generation of Gravity-Driven Sediment Flows on a Predominantly Sandy Seabed | |
Flores, Raul P.1,2; Rijnsburger, Sabine3; Meirelles, Saulo3; Horner-Devine, Alexander R.1; Souza, Alejandro J.4; Pietrzak, Julie D.3; Henriquez, Martijn3; Reniers, Ad3 | |
2018-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:15页码:7634-7645 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Chile; Netherlands; Mexico |
英文摘要 | Wave-supported gravity flows (WSGFs) generate rates of sediment flux far exceeding other cross-shelf transport processes, contributing disproportionately to shelf morphology and net cross-shelf fluxes of sediment in many regions worldwide. However, the conditions deemed necessary for the formation of WSGF limit them to a narrow set of shelf conditions; they have been observed exclusively in regions where the seabed consists of very fine-grained sediment and typically co-occur with nearby river flood events. Here we document the occurrence of a WSGF event on a predominantly sandy seabed and in the absence of a preceding river flood. Our measurements confirm that the dynamics are governed by the friction-buoyancy balance observed in other WSGF and that WSGF can form in mixed grain-size environments and transport high concentrations of sand. The occurrence of WSGF on a predominantly sandy seabed suggests that they may occur under a much wider range of conditions and, given the global prevalence of sandy shelves, they may be a more frequent and more ubiquitous feature of shelf dynamics than previously thought. Plain Language Summary The processes that exchange sediments in gently sloping ocean regions are still not well understood. Previous studies have identified wave-supported gravity flows (WSGFs) as a leading process for the exchange of muds in many regions worldwide. These sediment flows occur when wave action resuspends seabed sediment and generates a thin near-bed layer with very high concentrations that is able to move downslope due to gravity. The measurements we present here suggest that these type of flows can also move large amounts of sediments in predominantly sandy environments and therefore may occur more frequently than previously thought. |
英文关键词 | sediment transport wave-supported gravity flows marine gravity-driven flows sandy seabed cross-shelf transport |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443129500045 |
WOS关键词 | FRESH-WATER INFLUENCE ; RIVER CONTINENTAL-SHELF ; PARTICULATE MATTER SPM ; DUTCH COASTAL ZONE ; ANNUAL TIME SCALES ; NORTHERN CALIFORNIA ; TRANSPORT PROCESSES ; SUSPENDED SEDIMENT ; EEL RIVER ; BOUNDARY-LAYER |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27736 |
专题 | 气候变化 |
作者单位 | 1.Univ Washington, Civil & Environm Engn, Seattle, WA 98195 USA; 2.Univ Tecn Federico Santa Maria, Dept Obras Civiles, Valparaiso, Chile; 3.Delft Univ Technol, Dept Hydraul Engn, Delft, Netherlands; 4.CINVESTAV, Merida, Mexico |
推荐引用方式 GB/T 7714 | Flores, Raul P.,Rijnsburger, Sabine,Meirelles, Saulo,et al. Wave Generation of Gravity-Driven Sediment Flows on a Predominantly Sandy Seabed[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(15):7634-7645. |
APA | Flores, Raul P..,Rijnsburger, Sabine.,Meirelles, Saulo.,Horner-Devine, Alexander R..,Souza, Alejandro J..,...&Reniers, Ad.(2018).Wave Generation of Gravity-Driven Sediment Flows on a Predominantly Sandy Seabed.GEOPHYSICAL RESEARCH LETTERS,45(15),7634-7645. |
MLA | Flores, Raul P.,et al."Wave Generation of Gravity-Driven Sediment Flows on a Predominantly Sandy Seabed".GEOPHYSICAL RESEARCH LETTERS 45.15(2018):7634-7645. |
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