【摘要】 日本"3.11"地震海啸事件发生后,为了避免灾难重演,各滨海国家在加强海啸基础理论研究、改进海啸预警系统的同时,还应对沿海重大工程及重点保障目标进行地震海啸灾害风险排查及再评估工作;对在建的重大基础设施和社会经济功能区划应进行全面的地震海啸安全论证。在此背景下,该文首先概括总结了我国东南沿海的地震海啸风险及历史海啸事件时空分布,简要介绍了越洋海啸传播特征。海啸源选取基于潜在可能最大海啸,选取环太平洋地震带上的潜在地震海啸源,进行温州瓯江口地区越洋海啸影响评估计算。海啸数值计算模型采用美国康奈尔大学的COMCOT模型,利用该模型对2010年智利海啸、2011年日本海啸进行了近场、远场模拟验证,计算结果与观测数据吻合良好,模型可信。应用联合国教科文组织政府间海洋学委员会(UNESCO/IOC)太平洋海啸预警系统的海啸危险性等级标准,结合评估计算结果,对瓯江口浅滩地区海啸危险性进行等级划分,获得了该地区的海啸危险性初步评估结果。结果表明:在所选的10个潜在或历史海啸源产生的越洋海啸对研究区域的影响均小于100 cm,此规模的海啸不易对该地区造成灾害性影响。研究结果对于指导该地区的海啸灾害风险评估及风险排查具有一定的参考价值。更多还原

【Abstract】 Since the 3·11 Japan tsunami event,most of coastal countries not only strengthened theoretical research on physical mechanism of tsunami,but also improved tsunami warning system.In addition,tsunami hazards investigation and reevaluation has been carried out for major project and important guarantee objective along China’s coast.Moreover,the major infrastructure projects and socio-economic function zoning should be comprehensively evaluted for tsunami hazards.In this paper,the temporal and spatial distribution characteristics of tsunami hazards were reviewed for China South-East coastal areas.A brief introduction about the propagation characteristic of transoceanic tsunami was given.Tsunami sources were base on the potential earthquake,which was selected on the circum-Pacific seismic belt.Assessment calculations were implemented by determined tsunami sources to evaluate tsunami hazards for the study area.COMCOT model,developed by Cornell University,was used in this paper.The model was validated by 2010 Chile tsunami and 2011 Japan tsunami.The near-field and far-field simulation results agreed well with the observation data.We referred the new tsunami hazard rank criteria recommended by UNESCO/IOC.Tsunami hazards classifications were divided for the shoal area of Oujiang estuary by analyzing the simulation results.Preliminary assessment results for tsunami hazards have been completed in the paper.The assessment results showed that the maximum amplitude generated from the selected 10 potential tsunami sources was less than 100cm,indicating that the potential tsunami in this region could not cause severe impact.The results will be benefit to guide tsunami disaster risk assessment and investigation for the study region.更多还原