International Research Fellowship Program: Determining Bedrock Incision Rates using Cosmogenic Isotope \3He\ Analysis to Chronologically Constrain the Wetland Development Cycle in

国际研究奖学金计划：使用宇宙成因同位素 3He 分析确定基岩切割率，以按时间顺序限制湿地发展周期

• 批准号: 0754345
• 负责人: Amanda Keen-Zebert
• 金额: $ 21.54万
• 依托单位: Keen-Zebert Amanda K
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0754345&HistoricalAwards=false
• 关键词: International; Research; Fellowship; Program; Determining

0754345Keen-ZebertThe International Research Fellowship Program enables U.S. scientists and engineers to conduct nine to twenty-four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad.This award will support a twenty-four month research fellowship by Dr. Amanda Keen-Zebert to work with Dr. Stephen Tooth at the University of Wales, Aberystwyth in the UK.Wetlands are a focus of conservation efforts worldwide. However, geomorphological wetland research has been limited. In the Highveld of South Africa, the relationship between alluvial and bedrock river processes has consequences on the stability of wetlands that are an important water resource in a subhumid to semiarid area. The researchers in this project are investigating the long term development and sedimentological factors that effect wetland development and stability in South Africa. The researchers are adding a chronological element to a conceptual model of wetland development in the region that suggests that the progression from exhumation to breeching of dolerite intrusions into less resistant sedimentary rock controls the cycle of wetland development. By determining the bedrock incision rates through the dolerite intrusions using cosmogenic isotope analysis (CIA) and the timing of floodplain development through optically stimulated luminescence (OSL), it is possible to add long term chronological constraint to the conceptual model of wetland development. The improvement of the model will increase the understanding of river development in southern Africa, as well as the understanding of alluvial bedrock rivers and the interaction between alluvial and bedrock processes. Current wetland rehabilitation efforts in southern Africa are directed at human causes of degradation. If the degradation of these wetlands is structurally geomorphic in nature, then management strategies need adjustment. The information gained in this study will benefit wetland conservation and rehabilitation programs in South Africa.

0754345Keen-Zebertthe国际研究奖学金计划使美国科学家和工程师能够在国外进行九至二十四个月的研究。 该计划的奖项为联合研究提供了机会，并且在国外使用独特或互补的设施，专业知识和实验条件。该奖项将支持Amanda Keen-Zebert博士的二十四个月研究奖学金，以与威尔士大学的Stephen Tooth博士合作，在英国的Aberystwyth，UK.Wetlands的Aberystwyth，wetlands是Worldword Worldworvide的重点。 但是，地貌湿地研究受到限制。 在南非的高堡，冲积和基岩河工艺之间的关系对湿地的​​稳定性产生了影响，湿地是亚湿区到半干旱地区的重要水资源。 该项目的研究人员正在研究影响南非湿地发展和稳定性的长期发展和沉积学因素。 研究人员正在为该地区湿地发展的概念模型增加一个时间顺序的元素，这表明从挖掘到将多列石侵入式侵入到耐药性沉积岩石次数的过程中，可以控制湿地发育的循环。 通过使用宇宙同位素分析（CIA）确定基岩切口率，以及通过光学刺激的发光（OSL）的洪泛区发育的时机，可以在湿地发育的概念模型中添加长期的年代学约束。该模型的改善将提高对南部非洲河流发展的理解，以及对冲积基岩河流以及冲积和基岩过程之间的相互作用的理解。 南部非洲目前的湿地康复工作是针对人类降解原因的。 如果这些湿地的降解本质上是结构性的地貌，那么管理策略就需要调整。 这项研究中获得的信息将使南非的湿地保护和康复计划受益。