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以鳌江口为例,通过试挖槽实测资料分析及波流共同作用下的二维泥沙数学模型研究了浙江南部淤泥质强潮河口拦门沙的成因及航道开挖后泥沙回淤规律.研究表明,因河口迅速展宽,水流扩散,输沙能力不断减弱,河口区的最大浑浊带为拦门沙的形成提供了丰富的泥沙来源,泥沙在口门附近堆积,形成拦门沙浅段.拦门沙开挖后泥沙回淤规律为:航槽回淤主要发生在风浪天,台风期发生骤淤,无风天航槽泥沙淤积较少.回淤的泥沙主要是滩面泥沙在风浪作用下的局部搬运.风浪过后,挖槽内发生“冲刷”现象,主要是由于浮泥密实造成的.通过与天津港等淤泥质海岸台风期骤淤的对比分析,认为较强的动力条件和丰富的泥沙来源是鳌江口骤淤的主要原因,在动力较强的淤泥质海岸骤淤强度较大.此外,还探讨了该类河口拦门沙的治理思路.
Taking Aojiang River Estuary as an example, the causes of sand barring and the law of sediment silting after excavation in the southern part of Zhejiang Province were studied by two-dimensional sediment mathematical model under the combined action of wave test and trench test. The research shows that due to the rapid expansion of the estuary, the flow of water is spreading and the capacity of transporting sediment is declining. The maximum turbidity zone in the estuary area provides a rich source of sediment for the formation of barren sand. The law of sediment back silting after excavation of sand bar is as follows: siltation mainly occurs in wind-wave days and siltation during typhoon period, Local handling of beach sediment under the influence of wind and waves After the storm, the phenomenon of “scouring” occurred in the trenches, which is mainly caused by the dense floating mud.Compared with the silting in the silt coasts such as Tianjin Port, , That strong dynamic conditions and rich source of sediment are the main reason for the silting in the Aojiang estuary, and the strong silt coastal coast is more prone to abrupt silting. In addition, .