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The Official Magazine of The Oceanography Society
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View Issue TOCVolume 30, No. 3Pages 72 - 83


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Stratigraphic Formation of the Mekong River Delta và Its Recent Shoreline Changes

jpliu
ncsu.edu Affiliation:

Department of Marine, Earth & Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA

Search for more papers by this author">J. Paul Liu ,Search for more papers by this author">David J. DeMaster,Search for more papers by this author">Thanh T. Nguyen,Search for more papers by this author">Yoshiki Saito ,Search for more papers by this author">Van Lap Nguyen,Search for more papers by this author">Thi Kim Oanh Ta,Search for more papers by this author">Xing LiPublished Online: August 9, 2017 Share
articlearticle, tác giả = Institute of Resource Geography, VAST, Ho đưa ra Minh City, Vietnam và Thi Kim Oanh Ta , title = Stratigraphic Formation of the Mekong River Delta & Its Recent Shoreline Changes, journal = Oceanography, year = 2017, month = September, note =

Where the Mekong River discharges into the East Sea (also known as the South đài loan trung quốc Sea), it has formed the world’s third largest delta plain with an area of ~50,000 km2. Numerous cores recovered from the subaerial delta reveal that it has prograded ~220 km southeastward within the past 7,500 years. Recent extensive seismic và geochemical surveys of the adjacent subaqueous delta indicate that the Mekong River forms a classic sigmoidal, cross-shelf clinoform immediately off its distributaries that is up to 15 m thick, with topset, foreset, và bottomset facies. These deposits are constrained within water depths of 20 m. Mekong-derived sediment packages extend ~300 km along shelf in the southwestward direction khổng lồ the tip of the Ca Mau Peninsula, where they form a distal mud depocenter up lớn 22 m thick. These sediment packages can also be traced into the Gulf of thái lan to water depths of 25 m. The proximal and distal deposits cover ~11,000 km2 of the shelf.

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Historically, the Mekong Delta has prograded seaward at a mean rate of >30 myr–1, or 7 km2 yr–1; however, study of the past 43 years of Landsat images indicates that the mode of sedimentation in the delta shifted starting in 2005. From 1973 khổng lồ 2005, the Mekong Delta’s seaward shoreline growth decreased gradually from a mean of 7.8 m yr–1 to lớn 2.8 m yr–1, & after 2005 it became negative, with a retreat rate of −1.4 m yr–1. The net deltaic land area gain has also been slowing, with the mean rate decreasing from 4.3 km2 yr–1 (1973–1979) lớn 1.0 km2 yr–1 (1995–2005), & then to −0.05 km2 yr–1 (2005–2015). Thus, in about 2005, the subaerial Mekong Delta transitioned from a constructive mode lớn an erosional (or destructive) mode. Furthermore, not only is the subaerial Mekong Delta land area gradually diminishing, but high-resolution CHIRP sonar profiling surveys off the east-central Ca Mau Peninsula reveal that this portion of the subaqueous delta is also eroding. With the construction of more dams, sand mining, delta subsidence, increasing storms, and sea level rise, the Mekong Delta will likely face more destructive changes, with erosion both of coastlines and underwater deposits.

, volume = issue_volume, url = https://doi.org/10.5670/oceanog.2017.316,
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TY - JOURAU - J. Paul Liu | Department of Marine, Earth và Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA and David J. DeMaster | Department of Marine, Earth và Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA and Thanh T. Nguyen | Vietnam Academy of Science và Technology (VAST) Institute of Marine Geology & Geophysics, Hanoi, Vietnam và Yoshiki Saito | Geological Survey of Japan, National Institute of Advanced Industrial Science và Technology (AIST), Tsukuba, Japan, và Estuary Research Center, Shimane University, Matsue, japan and Van Lap Nguyen | Institute of Resource Geography, VAST, Ho bỏ ra Minh City, Vietnam và Thi Kim Oanh Ta | Institute of Resource Geography, VAST, Ho bỏ ra Minh City, Vietnam và Xing Li | School of Geography, Geomatics & Planning, Jiangsu Normal University, Xuzhou, ChinaPY - 2017TI - Stratigraphic Formation of the Mekong River Delta and Its Recent Shoreline ChangesJO - OceanographyVL - 30UR - https://doi.org/10.5670/oceanog.2017.316ER -
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Where the Mekong River discharges into the East Sea (also known as the South china Sea), it has formed the world’s third largest delta plain with an area of ~50,000 km2. Numerous cores recovered from the subaerial delta reveal that it has prograded ~220 km southeastward within the past 7,500 years. Recent extensive seismic và geochemical surveys of the adjacent subaqueous delta indicate that the Mekong River forms a classic sigmoidal, cross-shelf clinoform immediately off its distributaries that is up to lớn 15 m thick, with topset, foreset, & bottomset facies. These deposits are constrained within water depths of trăng tròn m. Mekong-derived sediment packages extend ~300 km along shelf in the southwestward direction to lớn the tip of the Ca Mau Peninsula, where they form a distal mud depocenter up to 22 m thick. These sediment packages can also be traced into the Gulf of xứ sở nụ cười thái lan to water depths of 25 m. The proximal & distal deposits cover ~11,000 km2 of the shelf.

Historically, the Mekong Delta has prograded seaward at a mean rate of >30 myr–1, or 7 km2 yr–1; however, study of the past 43 years of Landsat images indicates that the mode of sedimentation in the delta shifted starting in 2005. From 1973 lớn 2005, the Mekong Delta’s seaward shoreline growth decreased gradually from a mean of 7.8 m yr–1 to lớn 2.8 m yr–1, & after 2005 it became negative, with a retreat rate of −1.4 m yr–1. The net deltaic land area gain has also been slowing, with the mean rate decreasing from 4.3 km2 yr–1 (1973–1979) lớn 1.0 km2 yr–1 (1995–2005), và then khổng lồ −0.05 km2 yr–1 (2005–2015). Thus, in about 2005, the subaerial Mekong Delta transitioned from a constructive mode to an erosional (or destructive) mode. Furthermore, not only is the subaerial Mekong Delta land area gradually diminishing, but high-resolution CHIRP sonar profiling surveys off the east-central Ca Mau Peninsula reveal that this portion of the subaqueous delta is also eroding. With the construction of more dams, sand mining, delta subsidence, increasing storms, và sea cấp độ rise, the Mekong Delta will likely face more destructive changes, with erosion both of coastlines và underwater deposits.


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