RAPID: Collaborative Research: Tracking the Flood Pulse of a Record Discharge of the Brazos River in the Gulf of Mexico
RAPID:合作研究:追踪墨西哥湾布拉索斯河创纪录流量的洪水脉冲
基本信息
- 批准号:1829221
- 负责人:
- 金额:$ 4.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-03-01 至 2019-02-28
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The transport and fate of sediment carried by rivers to the coastal ocean is of great ecological and societal importance. River input is the primary source of land-derived sediment to the marine environment. These particles have significant impacts on the health of coastal ecosystems and the geology and bathymetry of coastal oceans and shipping channels. They directly and indirectly affect fisheries and navigation. This research focuses on the movement of sediments carried into the Gulf of Mexico, via the Brazos River, during the unprecedented rainfall and flooding event that occurred during Hurricane Harvey. The Brazos River ranks as the second largest contributor of nutrients and organic matter to the Gulf of Mexico, after the Mississippi River. Unlike the Mississippi, however, most sediment delivered to the Gulf of Mexico from the Brazos is carried during flooding events like that which accompanied Hurricane Harvey. Little is known about the fate of this sediment. It is not clear if it is retained in the coastal zone, where the nutrients and chemicals it carries affect the coastal environment, or is carried offshore and deposited in the deep waters of the Gulf of Mexico. Through intensive sampling of sediments just offshore the mouth of the Brazos River and further offshore in the Gulf of Mexico in what is known as the Texas Mud Blanket, this project will determine the principal repository of sediments delivered to the western Gulf of Mexico by a major Texas river. The overall goal of this research is to investigate the hypothesis that flood-borne sediment from the Brazos River is initially deposited in the coastal zone and subsequently mobilized and carried offshore with a large fraction of it being deposited in the Texas Mud Blanket. The work builds on the analysis of sea-bottom sediment samples collected in 2017 during flooding associated with Hurricane Harvey. This new program will include two sampling cruises to augment already collected data. The first cruise will entail acquisition of ~25 cores that will indicate sediment deposition and transport in the near-shore region near the Brazos River mouth. Preliminary work indicates that much of the initial deposition of Brazos River sediment occurred east of the original sampling region. The second cruise in will collect additional Brazos region cores and expand sampling into the Texas Mud Blanket, with the goal of documenting changes in Brazos sediment deposition from the Hurricane Harvey flooding. During both cruises, complementary hydrography data will be collected. This includes water column velocities and suspended sediment loads. Provenance of individual layers, within the sediment samples and box cores, will be determined by digital photos and x-radiographs of intact core slabs that show sediment fabric and structures. To differentiate Gulf of Mexico from Brazos River sediments, sub-samples of collected cores will be geochemically analyzed and profiled for short-lived-radioisotope geochronology, water content, grainsize distribution, and mercury and carbonate content. These indicators will help identify the origin of the sediments deposited in the system.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
河流向沿海海洋携带的沉积物的运输和命运非常重要。河流的投入是海洋环境的土地衍生沉积物的主要来源。这些颗粒对沿海生态系统的健康以及沿海海洋和运输渠道的地质和测深作用。它们直接和间接影响渔业和导航。这项研究的重点是在哈维飓风期间发生的前所未有的降雨和洪水事件中,通过布拉索斯河运送到墨西哥湾的沉积物的运动。布拉索斯河(Brazos River)是仅次于密西西比河(Mississippi River)的墨西哥湾的第二大营养和有机物贡献者。 但是,与密西西比州不同,在洪水事件中,大多数沉积物都从布拉索斯(Brazos)运送到墨西哥湾,例如伴随飓风哈维(Harvey)的洪水事件。 对这种沉积物的命运知之甚少。 目前尚不清楚它是否保留在沿海地区,其携带的养分和化学物质会影响沿海环境,或者被带到海上并沉积在墨西哥湾深水中。通过将沉积物的密集采样仅在近海的布拉索斯河河口和墨西哥湾的近海河口中,这被称为德克萨斯州的泥毯,该项目将确定主要德克萨斯河由一条主要的德克萨斯河运送到墨西哥西部海湾的主要沉积物的主要储存库。 这项研究的总体目的是调查以下假设:布拉索斯河的洪水沉积物最初被沉积在沿海地区,然后动员并携带了海上,其中很大一部分被沉积在德克萨斯州的泥浆毯中。 这项工作是基于对与飓风哈维相关的洪水泛滥期间收集的海底沉积物样本的分析。 这个新程序将包括两次采样巡航,以增强已经收集的数据。第一次巡航将需要收购约25个核心,这将表明在布拉索斯河口附近的近岸地区沉积和运输。 初步工作表明,布拉索斯河沉积物的最初沉积大部分发生在原始采样区域以东。 第二次巡游将收集更多的布拉索斯地区核心,并将采样扩展到德克萨斯州的泥毯中,目的是记录哈维飓风洪水中的brazos沉积物沉积的变化。 在两次巡航过程中,将收集互补的水文数据。这包括水柱速度和悬浮沉积物负荷。在沉积物样品和盒子内,各个图层的出处将由数字照片和完整核心板的X射线仪确定,这些核心板显示了沉积物织物和结构。 为了区分墨西哥湾与布拉索斯河沉积物,将对收集的核心的子样本进行地球化学分析和介绍,以进行短寿命的降低降量异构体,水含量,水分含量,晶格分布以及汞和碳酸盐和碳酸盐含量。 这些指标将有助于确定系统中沉积的沉积物的起源。该奖项反映了NSF的法定任务,并认为使用基金会的知识分子优点和更广泛的影响审查标准,被认为值得通过评估来获得支持。
项目成果
期刊论文数量(0)
专著数量(0)
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会议论文数量(0)
专利数量(0)
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Timothy Dellapenna其他文献
Timothy Dellapenna的其他文献
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{{ truncateString('Timothy Dellapenna', 18)}}的其他基金
RAPID: Storm layer deposition, contaminant deliver and dispersal from Hurricane Ian (Sept. 2022) along SW Florida estuaries and fringing mangroves
快速:飓风伊恩(2022 年 9 月)沿佛罗里达州西南部河口和边缘红树林的风暴层沉积、污染物输送和扩散
- 批准号:
2309957 - 财政年份:2023
- 资助金额:
$ 4.5万 - 项目类别:
Standard Grant
NSFOCE-BSF: Collaborative Research: The Role and Mechanisms of Nuclei-induced Calcium Carbonate Precipitation in the Coastal Carbon Cycle: A First In-depth Study
NSFOCE-BSF:合作研究:核诱导碳酸钙沉淀在沿海碳循环中的作用和机制:首次深入研究
- 批准号:
1635893 - 财政年份:2016
- 资助金额:
$ 4.5万 - 项目类别:
Standard Grant
Research Experience in Marine Science and Marine Biology in the Gulf of Mexico and other Coastal Oceans at Texas A&M University at Galveston (TAMUG-REU)
德克萨斯州墨西哥湾和其他沿海海洋的海洋科学和海洋生物学研究经验
- 批准号:
0851860 - 财政年份:2009
- 资助金额:
$ 4.5万 - 项目类别:
Continuing Grant
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