论文部分内容阅读
于1981－1988年以浅地层剖面仪和回声测深仪取得沙波观测资料，运用这些资料以及河床表层沉积物和历年河口水文、地形资料，采用水文学、沉积学与泥沙运动力学相结合的研究方法，分析长江河口底沙的运移规律。结果表明：长江河口底沙运动非常频繁，一般有单颗粒滚动、跳跃，沙波及沙体推移等形式；在沙质床面上沙波发育良好，其形成、发展和消失与潮差和落潮流速有一定的相关性，因受涨、落潮流改造，沙波难于得到充分发展；沙体推移为长江河口底沙运动的主要形式，推移量很大，有时甚至能使滩槽移位，迫使通海航道改线。研究底沙运动规律为长江河口治理提供科学依据。
In 1981-1988, the Shapotional observation data were obtained by shallow profiler and echo sounder. Using these data and the hydrological and topographic data of surface sediments in the riverbed and the estuary over the years, hydrology, sedimentology and sediment dynamics were combined Research methods, analysis of the sediment transport law of the Yangtze River estuary. The results show that the sediment movement in the Yangtze River estuary is very frequent, generally with the form of single grain rolling, jumping, sand wave and sand body movement. The sand wave is well developed on the sandy bed, and its formation, development and disappearance are related to tidal current and ebb tide velocity There is a certain degree of correlation. Due to the ups and downs, the sand wave is hard to be fully developed. The sand body movement is the main form of sediment movement at the mouth of the Yangtze River, and there is a large amount of displacement and sometimes the beach groove can be displaced to force the sea Waterway change line. Studying the laws of sediment movement provides a scientific basis for the management of the Yangtze River estuary.