灌河口海域泥沙悬浮和沉降试验研究

掌握灌河口海域泥沙运动规律是开展灌河口航道整治研究的基础。以现场所取泥沙为研究对象,通过大型波浪水槽试验研究灌河口海域泥沙在不同的水深、不同的波周期和波高条件下的悬浮规律。通过静水沉降试验研究灌河口海域泥沙在不同初始浓度、不同水深下的沉降特性。结果表明,在极限波高情况下,水体上部区域含沙量较小,且沿垂线分布变化较小,但水体底部附近含沙量较大,总体上底部含沙量比上部水体含沙量大0.25~0.96 kg m^3;不同水深以及不同初始含沙量情况下,泥沙沉降速度0.08~0.20 cm s,与单颗粒泥沙沉速在同一量级,灌河口海域泥沙絮凝作用较弱。

Experiment study on suspension and settling of sediment in Guanhe estuary sea area

Grasping the law of sediment movement in Guanhe estuary sea area is the basis for studying of waterway regulation.Taking the sediment collected on site as the research object,we study the suspension law of sediment in Guanhe estuary under different water depths,wave periods and wave heights by large wave flume test,and research the sediment settlement characteristics under different initial concentrations and water depths by static water settlement test.The results show that the sediment concentration in the upper part of the water body is small and vary little along the vertical line under the limiting wave height,but the sediment concentration near the bottom is large.Overall,the sediment concentration near the bottom is 0.25 kg/m3 to 0.96 kg/m3 higher than that in the upper water.The range of sediment settling velocity is 0.08 cm/s to 0.20 cm/s under different water depths and initial sediment concentrations,which is the same order of magnitude as that of single sediment.The flocculation of sediment is weak in Guanhe estuary sea area.