Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080396 |
Seeking the Shore: Evidence for Active Submarine Canyon Head Incision Due to Coarse Sediment Supply and Focusing of Wave Energy | |
Smith, M. Elliot1; Werner, Samuel H.1; Buscombe, Daniel1; Finnegan, Noah J.2; Sumner, Esther J.3; Mueller, Erich R.4 | |
2018-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:22页码:12403-12413 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | Submarine flows carve canyons into continental shelves, yet the conditions and events responsible for canyon incision are incompletely understood. Coarse sediment flux has been shown to promote terrestrial bedrock incision via abrasion in rivers, but similar processes in submarine canyons have yet to be systematically documented. We use repeat bathymetry, provenance analysis, wave modeling, and channel network analysis to show that longshore sheltering and wave focusing by the Delgada submarine canyon induce sediment accumulation and elevated wave shear stresses in its headwall region that frequently mobilize coarse bed material. These mobilizations scour bedrock in the headwall and generate abrasive turbidity currents that work to carve the canyon's active channel into bedrock. These findings highlight an important positive feedback between submarine canyons, waves, and sediment supply and suggest that submarine canyons adjacent to wave-dominated, coarse sediment-rich coastlines seek the shoreline through headward incision. Plain Language Summary The carving of submarine canyons into the continental shelf is poorly understood relative to river valleys on land. We studied a submarine canyon in Northern California that is connected through littoral transport to river sediment using a combination of seafloor mapping, tracking sediments using their chemical elements, and simulating waves and currents to better understand which processes are responsible for canyon erosion. Our findings suggest that canyon focusing of wave energy and an abundant supply of coarse sediment cause erosion at the canyon's head. This finding helps explain why submarine canyon channel networks erode toward shore and predicts that canyons near mountain ranges will preferentially remain connected the shoreline. |
英文关键词 | submarine canyons erosion sediment connectivity wave focusing provenance |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453250000034 |
WOS关键词 | MENDOCINO TRIPLE JUNCTION ; TURBIDITY CURRENTS ; GRAIN-SIZE ; BEDROCK EROSION ; SWAN MODEL ; CALIFORNIA ; OFFSHORE ; FLOWS ; MORPHOLOGY ; MONTEREY |
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/26946 |
专题 | 气候变化 |
作者单位 | 1.No Arizona Univ, Sch Earth & Sustainabil, Flagstaff, AZ 86011 USA; 2.Univ Calif Santa Cruz, Earth Sci, Santa Cruz, CA 95064 USA; 3.Univ Southampton, Ocean & Earth Sci, Southampton, Hants, England; 4.Univ Wyoming, Dept Geog, Laramie, WY 82071 USA |
推荐引用方式 GB/T 7714 | Smith, M. Elliot,Werner, Samuel H.,Buscombe, Daniel,et al. Seeking the Shore: Evidence for Active Submarine Canyon Head Incision Due to Coarse Sediment Supply and Focusing of Wave Energy[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(22):12403-12413. |
APA | Smith, M. Elliot,Werner, Samuel H.,Buscombe, Daniel,Finnegan, Noah J.,Sumner, Esther J.,&Mueller, Erich R..(2018).Seeking the Shore: Evidence for Active Submarine Canyon Head Incision Due to Coarse Sediment Supply and Focusing of Wave Energy.GEOPHYSICAL RESEARCH LETTERS,45(22),12403-12413. |
MLA | Smith, M. Elliot,et al."Seeking the Shore: Evidence for Active Submarine Canyon Head Incision Due to Coarse Sediment Supply and Focusing of Wave Energy".GEOPHYSICAL RESEARCH LETTERS 45.22(2018):12403-12413. |
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