Collaborative Research: The Japan March 11 Earthquake, Tsunami Inundation, and Initial Spread of Fukushima Dai-ichi Radionuclides into the Pacific Ocean: Model Assessment

合作研究：日本 3 月 11 日地震、海啸淹没以及福岛第一核电站放射性核素最初扩散到太平洋：模型评估

• 批准号: 1141697
• 负责人: Changsheng Chen
• 金额: $ 8万
• 依托单位: University of Massachusetts, Dartmouth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1141697&HistoricalAwards=false
• 关键词: Collaborative; Research; Japan; March; 11

This project is a comprehensive interdisciplinary study of the March 11 initial M=9 and M=7.9 earthquakes, the resulting tsunami wave generation, propagation and coastal inundation along northern Honshu Island, and the initial pathways and changes in Cs-237 concentrations as it enters the coastal waters at the Fukushima Daiichi nuclear facility and spreads across the shelf to deeper water. The approach is to use a combination of advanced seismic and nested coupled atmospheric/3-D ocean circulation numerical models plus available field measurements to simulate these processes starting with the initial March 11 M=9 earthquake bottom movement through April 12. During this 33-day simulation, the Cs-137 source concentration levels peaked and decreased towards the increasing coastal and off-shelf concentration levels, indicative of cross-shelf transport and shelf-ocean exchange processes, with a potential sedimentation loss and biological accumulation in the near-shore region. Detailed descriptions of the different model simulations, the resulting ocean circulation and water property output fields and initial analysis will be uploaded to a project website on a frequent basis for use by others interested in coastal physical and bio/chemical processes in the study area and as initial conditions for studies of the long-term spread of Cs-137 and other radionuclides in the Pacific Ocean.Intellectual Merit: The March 11 earthquakes, tsunami waves, coastal inundation, and initial release of Cs-137 into the ocean cover a wide range of time (from seconds to a month) and space (meters to 100's of km) scales. The multi-scale modeling approach with advanced models should produce a comprehensive and integrated description and understanding of the key physical processes involved and an independent assessment of the initial fate and spread of Cs-137 and its impact on the coastal ecosystem within the RAPID grant period.Broader Impacts: This study will foster U.S-Japanese collaboration in several areas of ocean sciences (marine geophysics, physical oceanography, and bio-chemistry related to Cs-137 and other released radionuclides). The team includes one Japanese PhD student, and it is anticipated that the models and model results posted on a website will be used by researchers, students, and others as the study progresses. One outcome of this study will be a tested new combined earthquake/3-D ocean model system that can be used by researchers and coastal planners for assessing potential tsunami flooding from future earthquakes in the megathrust zones east of Japan. This system can be applied to other earthquake and or tsunami-prone areas.

该项目是对3月11日初始M = 9和M = 7.9地震的全面跨学科研究。 The approach is to use a combination of advanced seismic and nested coupled atmospheric/3-D ocean circulation numerical models plus available field measurements to simulate these processes starting with the initial March 11 M=9 earthquake bottom movement through April 12. During this 33-day simulation, the Cs-137 source concentration levels peaked and decreased towards the increasing coastal and off-shelf concentration levels, indicative of cross-shelf transport and shelf-ocean exchange processes, with近岸地区的潜在沉积损失和生物积累。对不同模型模拟的详细描述，由此产生的海洋流通和水性能输出领域以及初始分析将在研究区域中频繁地上传到项目网站，以供其他对沿海物理和生物/化学过程感兴趣的人使用，并作为CS-137的长期扩散和Pacific Ocean的其他沿海核酸群的长期研究的初步条件。淹没，CS-137向海洋的初始释放覆盖了很长的时间（从秒到一个月）和空间（米至100 km）尺度。采用高级模型的多尺度建模方法应产生对所涉及的关键物理过程的全面和整合的描述和理解，并对CS-137的初始命运和传播进行独立评估，及其对迅速授予期内的沿海生态系统的影响。这项研究将促进美国与海洋科学的几个领域（促进美国与海洋科学的几个领域）的研究（促进美国杂货店，bio seach-secosemiss and bio cophy-ecome-cophysiss，bio和其他释放的放射性核素）。该团队包括一名日本博士生，预计随着研究的进行，研究人员，学生和其他人将使用发布网站上发布的模型和模型结果。这项研究的一个结果将是经过测试的新组合地震/3-D海洋模型系统，研究人员和沿海规划人员可以使用该系统来评估日本东部大型地震中未来地震的潜在海啸洪水。该系统可以应用于其他地震和 /或海啸易经的地区。