| DOI: | 10.1016/j.gloplacha.2013.09.008
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| 论文题名: | Recent sediment dynamics in the region of Mekong water influence |
| 作者: | Hein H.; Hein B.; Pohlmann T.
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| 刊名: | Global and Planetary Change
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| ISSN: | 0921-8231
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| 出版年: | 2013
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| 卷: | 110 | | 起始页码: | 183
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| 结束页码: | 194
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| 语种: | 英语
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| 英文关键词: | Hydrodynamic
; Mekong Delta
; Numerical model
; Seasonality
; Sediment discharge
; Sediment dynamic
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| Scopus关键词: | Coastal management
; Erosion and deposition
; Fine sediment dynamics
; Mekong Delta
; Seasonality
; Sediment discharge
; Sediment dynamic
; Wind-driven circulation
; Computer simulation
; Deposition
; Erosion
; Hydrodynamics
; Numerical models
; Rivers
; Sediments
; depositional environment
; discharge
; erosion
; fluvial deposit
; freshwater environment
; hydrodynamics
; numerical model
; river discharge
; seasonal variation
; seasonality
; sediment analysis
; sediment transport
; wind-driven circulation
; Gulf of Thailand
; Mekong River
; Pacific Ocean
; South China Sea
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| 英文摘要: | The recent fine sediment dynamics in the region of fresh water influence (ROFI) off the Mekong River are subject of this study. Each year about 160. t of sediment discharges from the river and disperses over the shelf. The typical tropical monsoon regime induces the pronounced seasonal cycle of the discharge of water and sediment. This cycle is reflected in rates of erosion and deposition on the shelf. The modern hypothesis says that this cycle of sediment results in deposition of sediment on the shelf during the high flow season and the transport back into the river mouth during the low flow season. A coupled hydrodynamic-wind-wave and sediment model, which simulates the seasonal cycle of the system, is used to prove this hypothesis.According to the simulation discharge and monsoon winds underlie significant asymmetries in the seasonal cycle. Modifications of the transport of sediment are the result of the asymmetry: As suggested in former studies the fine sediment spreads over the shelf during the high flow season. However, our model simulates wider deposition areas than suggested before. During low flow season the deposition is restricted to regions near the river mouth, elsewhere erosion due to waves, tides and wind driven circulation occurs. The asymmetry of the system results in the net-transport of most of the fine sediment predominately to the south - into the Gulf of Thailand. Additionally, we interpret our results in that way that near the river mouths the growth of the sub-aquatic delta is still ongoing. On the shelf, off the river mouths, the balanced seasonal cycle of deposition and erosion is present. South of the delta, the lack of deposition of sediments and strong coastal currents results in pronounced erosion, which should be taken seriously into account for coastal management strategies. © 2013 Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888288411&doi=10.1016%2fj.gloplacha.2013.09.008&partnerID=40&md5=107100d8310c09bddb9e2d274364c9d9
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/11137
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | University of Hamburg, ZMAW, Institute of Oceanography, Bundesstrasse 53, 20146 Hamburg, Germany
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| Recommended Citation: | |
Hein H.,Hein B.,Pohlmann T.. Recent sediment dynamics in the region of Mekong water influence[J]. Global and Planetary Change,2013-01-01,110.
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