【摘要】 磨刀门河口的自然演变进程深刻叠加了人类活动的影响,河口的地貌演变、水动力特征和泥沙输移沉积、底床冲淤趋势等发生显著变化。对围垦滩涂和修建治洪导堤两个主要人为治理措施的影响进行分析,得出整治前的磨刀门河口深槽水流散漫、泥沙漫滩沉积的状况得到改变,治理后河口的干支水道格局明确,水沙归槽输运,其中磨刀门水道因河槽束水束沙,径流输运显著,河槽呈现冲刷、延长的趋势;洪湾水道和白龙河水道亦河槽断面窄化、深化;磨刀门河口呈现出向外海延伸发展的趋势。更多还原

【Abstract】 The course of physical evolvement is deeply overlaid with human activities in the Modaomen Estuary.The geomorphological development,hydrodynamic force characteristics,sediment movement and erosion-deposition tendency are dramatically changed.Based on the influence of the two main human activities,including reclamation of tidal flat and construction of embankments,the results suggest that there be some significant transformations.The conditions of the water flowing over the channels and sediment deposition after spreading shoals are improved.After the implementation of the regulation project,the pattern of main stream and branching streams is clear and flow and sediment are more concentrated in the channel.The river channel have the tendency of erosion and prolongation because both runoff and sediment loads are remarkably restrained in the Modaomen channel and the runoff dynamics are synchronously strengthened.Furthermore,the transverse sections are narrowed and deepened in the Bailong River and Longshiku channel.The Modaomen Estuary exhibits the tendency of prolongation toward the sea area.更多还原