波流联合作用下珠江磨刀门河口絮凝问题研究

发布时间：2019-06-13 21:30

【摘要】：基于2013年3月29-31日河口拦门沙外固定船载和座底三脚架观测数据,分析了磨刀门河口细颗粒泥沙絮凝体发育规律及其影响因素。磨刀门河口水体中絮凝体约以62.5μm为临界粒径分成大、小絮凝体两种存在形式,且以小絮凝体组分为主;磨刀门河口水体盐度对絮凝体发育影响作用不明显,含沙量变化在一定条件下可以促进絮凝体发育;波流动力是控制絮凝体发育的主要因素,其中流速大致以0.32 m/s为临界值,波浪以0.75 m为临界有效波高,均对絮凝体的发育存在双重影响作用。波流联合动力对絮凝体发育影响较为复杂,不同阶段对絮凝体发育主控因素有所差异,磨刀门河口细颗粒泥沙的絮凝临界剪切应力约为1.25N/m2,波、流同时达到絮凝临界值时为絮凝体发育最佳条件。
[Abstract]:Based on the observation data of external fixed ship load and bottom tripod of Estuary sand from March 29 to 31, 2013, the development law and influencing factors of fine sediment flocculant in Mudaomen Estuary were analyzed. The floc in Moqaomen Estuary is divided into two forms with the critical particle size of 62.5 渭 m, and the small flocculant is the main component, and the effect of salinity on the development of flocs is not obvious, and the change of sediment concentration can promote the development of flocs under certain conditions, and the effect of salinity on the development of flocs is not obvious, and the change of sediment content can promote the development of flocs under certain conditions. Wave dynamics is the main factor controlling the development of flocs, in which the velocity of flow is about 0.32 m 鈮，

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