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杭州湾北岸的侵蚀/淤积波及其形成机制 被引量:14
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作者 刘苍字 虞志英 《福建地理》 2000年第3期12-15,共4页
杭州湾北岸岸滩冲淤变化频繁 ,侵蚀作用和淤积作用在时间和空间上交互更迭 ,形成了侵蚀波和淤积波。本文通过不同年代地形图的对比 ,结合自然条件的分析 ,探讨杭州湾北岸岸滩冲淤变化的特征和趋势 ,揭示该岸段侵蚀 /淤积波的形成机制 ,... 杭州湾北岸岸滩冲淤变化频繁 ,侵蚀作用和淤积作用在时间和空间上交互更迭 ,形成了侵蚀波和淤积波。本文通过不同年代地形图的对比 ,结合自然条件的分析 ,探讨杭州湾北岸岸滩冲淤变化的特征和趋势 ,揭示该岸段侵蚀 /淤积波的形成机制 ,为杭湾北岸的开发利用和海岸防护提供科学依据。 展开更多
关键词 杭州湾北岸 淤积 冲淤变化 侵蚀波 形成机制
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Coastal Erosion Feature and Mechanism at Feiyantan in the Yellow River Delta 被引量:4
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作者 陈沈良 张国安 陈小英 《Marine Science Bulletin》 CAS 2006年第1期11-21,共11页
Feiyantan was the discharge area of Diaokou River distributary of the Yellow River during the period of 1964 to 1976. The coastal erosion feature and morphological evolution at the Feiyantan coast are studied in the l... Feiyantan was the discharge area of Diaokou River distributary of the Yellow River during the period of 1964 to 1976. The coastal erosion feature and morphological evolution at the Feiyantan coast are studied in the light of the topography and section depth, and the corresponding dynamics of wave and current. Results indicate that the protruding topography left after the Diaokou River distributary was abandoned is the main cause of strong coastal erosion. Further research suggests that waves start up the sediment and the tidal current transports it, and the waves and tidal current are combined to be the dominant dynamic mechanism of coastal erosion, in which the tidal residual current takes and transports the sediment outward, thus causing the sediment to wane in the coast. 展开更多
关键词 coastal erosion WAVES tidal current Feiyantan coast Yellow River delta
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Dynamics Characteristics and Topographic Profile Shaping Process of Feiyan Shoal at the Yellow River Delta 被引量:1
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作者 应铭 李九发 +1 位作者 陈沈良 戴志军 《Marine Science Bulletin》 CAS 2008年第2期74-88,共15页
Feiyan Shoal is a sub Yellow River Delta, which was formed from Jan. 1964 to May 1976, when the Yellow River entered sea via Diaokou Channel. Since the terminal reach shifted to Qingshuigou channel in 1976, Feiyan Sho... Feiyan Shoal is a sub Yellow River Delta, which was formed from Jan. 1964 to May 1976, when the Yellow River entered sea via Diaokou Channel. Since the terminal reach shifted to Qingshuigou channel in 1976, Feiyan Shoal has been experiencing severe erosion and retreat. This paper explains the evolutionary characteristics of the typical profile of Feiyan Shoal from the perspective of dynamical force and sediments' characteristics. All this is on the basis of the data of topographic profiles observed since the 1970s and the samples of hydrology and sediments collected in situ in Apr. 2004, the analysis of the retreating distance, and the tidal and wave friction velocity distribution. Feiyan Shoal topographical profile has experienced a course of "fast erosion and retrogression - slow eroding modulation - fluctuate triggering change" in recent 30 years, which is also the gradual disappearing process of the delta front. The different intensity of sediment erosion resistance is the main reason for the erosion speed changes. Due to the hydrodynamic force changes, the water depth range of maximum retreating distance and between erosion and progradation became shallow. It indicates that the storm tide will still be the triggering force of seashore topographic profile evolutions in the future. 展开更多
关键词 The Yellow River Delta Feiyan Shoal EROSION wave and tidal co-action topographic profile sediment transport
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A Field Investigation on the Effects of Background Erosion on the Free Span Development of a Submarine Pipeline 被引量:4
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作者 WEN Shipeng XU Jishang +2 位作者 HU Guanghai DONG Ping SHEN Hong 《Journal of Ocean University of China》 SCIE CAS 2015年第4期621-628,共8页
The safety of submarine pipelines is largely influenced by free spans and corrosions. Previous studies on free spans caused by seabed scours are mainly based on the stable environment, where the background seabed scou... The safety of submarine pipelines is largely influenced by free spans and corrosions. Previous studies on free spans caused by seabed scours are mainly based on the stable environment, where the background seabed scour is in equilibrium and the soil is homogeneous. To study the effects of background erosion on the free span development of subsea pipelines, a submarine pipe- line located at the abandoned Yellow River subaqueous delta lobe was investigated with an integrated surveying system which in- eluded a Multibeam bathymetric system, a dual-frequency side-scan sonar, a high resolution sub-bottom profiler, and a Magnetic Flux Leakage (MFL) sensor. We found that seabed homogeneity has a great influence on the free span development of the pipeline. More specifically, for homogeneous background scours, the morphology of scour hole below the pipeline is quite similar to that without the background scour, whereas for inhomogeneous background scour, the nature of spanning is mainly dependent on the evolution of seabed morphology near the pipeline. Magnetic Flux Leakage (MFL) detection results also reveal the possible connec- tion between long free spans and accelerated corrosion of the pipeline. 展开更多
关键词 submarine pipeline SCOUR SPAN CORROSION
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