U.S.- Vietnam Planning Visit: Study of the Mekong River-derived sediment in the South China Sea

美国-越南计划访问：研究南海湄公河沉积物

• 批准号: 0514309
• 负责人: Jingpu (Paul) Liu
• 金额: $ 1.1万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-10-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0514309&HistoricalAwards=false
• 关键词: U.S.; Vietnam; Planning; Visit; Study

0514309LiuThis award supports a planning visit to enable Professors J Paul Liu and David De Master of the North Carolina State University in Raleigh to meet with Drs. Van Lap Nguyen and Thi Kim Oanh Ta of the Vietnamese Academy of Science and Technology (VAST). The visit will help develop a detailed collaborative plan to study the Mekong River-derived sediment in the South. The Mekong River, one of the largest rivers in Southeast Asia, flows southward from the Tibetan Plateau to the South China Sea (SCS), the largest marginal sea in the world, through the Indochinese Peninsula. It is 4200 km long and the sediment discharge of the river is currently about 160 million tons per year. The modern Mekong River delta was formed during the past 6000-7000 years, and since then, has prograded more than 200 km from the Cambodian border to it present coastline. However a huge amount of sediment also is suspected to escape the deltaic system, to disperse into the SCS, and to be transported southwest into the Gulf of Thailand. At present there is little knowledge about the distribution and thickness of the river-derived find-grained deposits associated with the Mekong dispersal system. It would be desirable to know how much riverine sediment and organic matter is buried in nearshore shelf deposits (sites of relatively high organic carbon preservation) and how much is transported offshore to deeper waters (with considerably lower organic carbon preservation efficiencies). In order to quantitatively determine the fate of Mekong River sediment and evaluate organic carbon burial within the continental shelf reaches of the dispersal system the researchers will focus on a study of the inner shelf mud deposit of the Mekong Delta using the new high-resolution X-Star Chirp Sub-bottom Profiler and sediment coring. This visit will enable the researchers to assess Vietnamese facilities, equipment, and existing data sets. They can then determine methods and schedules for future cruises. They will also devise a mechanism for arranging exchange visits for US and Vietnamese scientists and students. Results of the research project will help the marine science community understand sedimentation and carbon burial on a river-dominated ocean margin. The focus of the research in this epicontinental environment is consistent with several interdisciplinary NSF initiatives including Land-Ocean Interaction (LOICZ), Source-to-Sink (Marine Geology and Geophysics), RiOMar (River-dominated Oceanic Margins) and the Carbon Initiative. The visits and collaborative research will have broader impacts through partnership building among Vietnam and US institutions and scientists. It also provides an excellent opportunity to support the development of young marine geologists and to conduct exchange visits of students and scientists while promoting innovative, international, interdisciplinary scientific studies.

0514309刘该奖项支持一项计划访问，使罗利的北卡罗来纳州州立大学的J Paul Liu教授和大卫De Master教授能够与越南科学技术院（VAST）的货车Lap Nguyen博士和Thi Kim Oanh Ta博士会面。这次访问将有助于制定一项详细的合作计划，以研究湄公河在南方的沉积物。 湄公河是东南亚最大的河流之一，从青藏高原向南流经印度支那半岛，注入世界上最大的边缘海--南海。 它长4200公里，目前河流的泥沙排放量约为每年1.6亿吨。 现代湄公河三角洲形成于过去6000-7000年，从那时起，从柬埔寨边境到现在的海岸线已经超过200公里。 然而，大量的沉积物也被怀疑逃离三角洲系统，分散到南海，并向西南输送到泰国湾。 目前，对与湄公河扩散体系有关的河流源细粒沉积物的分布和厚度了解甚少。 最好能知道有多少河流沉积物和有机物质埋藏在近岸大陆架沉积物（有机碳保存程度较高的地点）中，有多少被移到近海较深的沃茨（有机碳保存效率低得多）。 为了定量确定湄公河沉积物的命运，并评估分散系统大陆架范围内的有机碳埋藏情况，研究人员将利用新的高分辨率X-Star Chirp浅地层剖面仪和沉积物取芯，重点研究湄公河三角洲大陆架内的泥存款。 此次访问将使研究人员能够评估越南的设施，设备和现有数据集。 然后，他们可以确定未来巡航的方法和时间表。 双方还将建立一个机制，安排美国和越南的科学家和学生进行互访。 该研究项目的结果将有助于海洋科学界了解以河流为主的海洋边缘的沉积和碳埋藏。 在这种陆缘环境中的研究重点与NSF的几个跨学科倡议一致，包括陆地-海洋相互作用（LOICZ），源到汇（海洋地质学和地球物理学），RiOMar（河流主导的海洋边缘）和碳倡议。 访问和合作研究将通过越南和美国机构和科学家之间的伙伴关系产生更广泛的影响。 它还提供了一个极好的机会，以支持青年海洋地质学家的发展，并进行学生和科学家的互访，同时促进创新，国际，跨学科的科学研究。