文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时...文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时段。指出七星岗古海岸地形的发现具有重要科学意义,表明中国学者的科研能力媲美同时代的洋学者,这一发现支撑了珠江三角洲的存在,同时为中国古籍对珠江河口湾演变的记述提供了实物证据,数十年来它在高等专业教学实习、科学研究、大众科学知识普及、社会文化教育中发挥了重要的作用,让多代地质、地理、海洋人才从中受益,并对珠江河口三角洲的整治与开发作出了很大的贡献。广州市政府1956年将七星岗古海岸遗址列为广州市重点文物,1983年广东省地理学会决定在该处建立纪念碑,近年建造七星岗古海岸遗址科学公园,这是对七星岗古海岸地形遗迹实施有效保护与发挥科教作用的绝佳举措。吴尚时重视野外考察,实事求是,不迷信、不盲从、善思考、勇探索、勤写作、贡献真知灼见的科学创新精神,值得我们学习。展开更多
A model for calculating the erosion distance of soft sea cliff under wave loading is established based on the erosion mechanism of soft sea cliff under wave loading and for considering wave hydrodynamic and sea cliff ...A model for calculating the erosion distance of soft sea cliff under wave loading is established based on the erosion mechanism of soft sea cliff under wave loading and for considering wave hydrodynamic and sea cliff material parameters.The model is verified,and the parameters are regressed using an indoor flume experiment.The erosion distances of the sea cliff in the northeast of the Pingtan Island are calculated by the model,and the results are compared with the measured data.The maximum erosion occurs in static water level,the location of the maximum erosion moves up as the wave continues,and the erosion stops when the wave lasts for a period of time.The erosion does not occur until the wave height exceeds a critical value; however,the contribution of large waves to the erosion is not relatively substantial.The calculated erosion distances at two places in the northeast of Pingtan Island are 0.32 m and 0.26 m.展开更多
文摘文章论述吴尚时1937年发现并报道的广州东南郊七星岗海岸侵蚀地形及其附近松岗海积沙堤地形,论证吴尚时是珠江河口三角洲地区古海岸地形的首先发现者以及该古海岸地形形成于全新世中期全球海平面上升珠江河口发生桂州海进8―2 ka BP时段。指出七星岗古海岸地形的发现具有重要科学意义,表明中国学者的科研能力媲美同时代的洋学者,这一发现支撑了珠江三角洲的存在,同时为中国古籍对珠江河口湾演变的记述提供了实物证据,数十年来它在高等专业教学实习、科学研究、大众科学知识普及、社会文化教育中发挥了重要的作用,让多代地质、地理、海洋人才从中受益,并对珠江河口三角洲的整治与开发作出了很大的贡献。广州市政府1956年将七星岗古海岸遗址列为广州市重点文物,1983年广东省地理学会决定在该处建立纪念碑,近年建造七星岗古海岸遗址科学公园,这是对七星岗古海岸地形遗迹实施有效保护与发挥科教作用的绝佳举措。吴尚时重视野外考察,实事求是,不迷信、不盲从、善思考、勇探索、勤写作、贡献真知灼见的科学创新精神,值得我们学习。
文摘对福建省平潭岛东北部软质海崖进行现场调查和量测,在约1 km的岸线上发现9处滑塌,滑塌物的堆积距离、堆积高度和滑塌物体积均随海崖高度的增大而增大.滑塌包括剪切破坏和顶部破坏两种类型,剪切破坏的破坏面几乎完全垂直,顶部破坏的破坏面呈L形.针对这两种滑塌类型,分别建立理论计算模型.结果表明:经理论计算模型得到的海蚀槽最大槽深(蚀退距离)为0.51~1.30 m;海崖稳定性随槽深的增大而降低;海崖顶部破坏的滑塌临界水深为0.22~0.61 m.
基金The National Natural Science Foundation of China under contract No.41306051the Natural Science Foundation of Fujian Province of China under contract No.2015J01625
文摘A model for calculating the erosion distance of soft sea cliff under wave loading is established based on the erosion mechanism of soft sea cliff under wave loading and for considering wave hydrodynamic and sea cliff material parameters.The model is verified,and the parameters are regressed using an indoor flume experiment.The erosion distances of the sea cliff in the northeast of the Pingtan Island are calculated by the model,and the results are compared with the measured data.The maximum erosion occurs in static water level,the location of the maximum erosion moves up as the wave continues,and the erosion stops when the wave lasts for a period of time.The erosion does not occur until the wave height exceeds a critical value; however,the contribution of large waves to the erosion is not relatively substantial.The calculated erosion distances at two places in the northeast of Pingtan Island are 0.32 m and 0.26 m.
