RAPID: Morphological Effects of Extreme Sea-Level Anomalies

RAPID：极端海平面异常的形态效应

• 批准号: 1531512
• 负责人: Peter Ruggiero
• 金额: $ 4.5万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-02-15 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1531512&HistoricalAwards=false
• 关键词: RAPID; Morphological; Effects; Extreme; Sea

A non-technical description of the project, which explains the project's significance and importanceCoastal erosion is a problem of national and global importance. As more people live along the shore, it is becoming increasingly vital to forecast how storms and other weather systems can alter the landscapes of coastlines. This RAPID project will collect intensive field data from the Oregon coastline during a period of elevated sea level and El Niño conditions that will make numerical models of beach movement and erosion more accurate. Numerical models of coastal processes are widely used by federal/state government agencies, local planners, and consultancies for a range of engineering and planning applications; accordingly, enhancing the quantitative accuracy of morphological evolution in these models has the potential to improve the quality of many products and services. A technical description of the projectThis RAPID project will implement a beach and dune topographic surveying campaign in the Netarts littoral cell, Oregon to quantify the impacts of extreme sea level anomalies on beach morphology. Hypotheses to be tested are whether 1) the majority of the dune-backed coastline within Oregon's headland-bound littoral cells will experience the "collision regime" of the Sallenger storm impact scale approximately 10-15% more during El Niño than during normal years. Dunes along the coast will also experience the "overwash regime" significantly more than during a typical year; 2) the southern extent of littoral cells will experience significant erosion and will be more impacted than the north. Gradients in longshore sediment transport will erode on the order of tens of thousands of cubic meters of sand from the southern ends of littoral cells with that sediment being transported both offshore and northward; and 3) Cross shore sediment supply to the beach following storms and at the end of the anomalous period, initiating the recovery phase for the dunes, will be highly spatially variable based on beach morphometrics, but will be strongly correlated to local gradients in longshore sediment transport. Although there is a general sense of how sea level anomalies and El Niño events impact beaches and dunes along the U.S. West Coast, there are few data sets available and the rates and mechanisms of onshore feeding of sediment are poorly documented. This research will quantify the sediment volume lost from the beach during each storm event and subsequently track the spatial and temporal trends in beach recovery throughout the winter and spring.

对项目的意义和重要的侵蚀的非技术描述与越来越多的人居住在岸上一样重要快速项目将在俄勒冈州海岸线的野外数据中收集升高的seando条件，这将使海滩运动的数字模型更加准确。这些模型具有许多产品和服务的质量。岬角的小细胞Willision Cellenge Storm撞击量表大约10-15％或沿海地沙丘。经历侵蚀，将比北方更受影响。 Storm and Ofe Anomouu S时期，沙丘的恢复阶段将基于海滩形态计量学上的空间变化，但是在远岸沉积物中，沿着美国西海岸的paches和沙丘中的梯度将是强烈的相关梯度。可用的数据集以及陆上饲料饲料饲料的速度和机制是延误播种的空间和时间趋势。