VERTICAL CHANGES IN SUSPENDED SEDIMENT CONCENTRATION IN THE LIANYUNGANG NEARSHORE AREA
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摘要: 根据连云港近岸海域15个测站的大、中潮6层位垂向同步连续海流、悬沙浓度和盐度等观测资料,分析了悬沙浓度的时空分布特征、潮周期内的变化及其影响因素,计算了再悬浮通量。结果表明,连云港近岸海域悬沙浓度在空间分布上符合悬沙分布的一般规律,在时间域中多以浓度峰的形式出现,并多集中在底层某一深度内,悬沙浓度峰主要发生在高低潮位以及涨落流速最大前后;近岸悬沙浓度峰出现的频率小,但强度较大,远岸悬沙浓度峰出现的频率大,但强度较低,泥沙再悬浮是悬沙浓度峰出现的主要原因;在垂向上悬沙浓度大致呈4种类型变化,潮流和水深是影响悬沙浓度变化的主要因素。Abstract: Synchronically measured were tidal current,suspended sediment concentration and salinity at 15 stations in the Lianyungang nearshore area for 6 vertical layers during the spring and mesotidal cycle. Temporal and spatial changes in suspended sediment concentration were studied,and the variation in suspended sediment concentration in the tidal cycle,impact factors and the re-suspended sediment fluxes calculated. The results show that the spatial distribution of suspended sediment concentration in the Lianyungang nearshore area is in line with the general distribution pattern of suspended sediments.The peak concentration of suspended sediment appears at a certain depth above the sea-bottom during high and low tide with strong tidal current.The frequency of peak concentration of suspended sediment is low nearshore, but the intensity is greater;whereas the frequency of peak concentration of suspended sediment is high offshore, but the intensity is lower.Tidal resuspension is the main reason of those peaks.The changes of the vertical distribution of suspended sediment concentration could be grouped into 4types.Tidal current and water depth are the main controlling factors.
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