基于ADCP反演渤海湾悬浮体浓度年变化

基于座底ADCP实测回波强度信号，结合短期实测悬浮体质量浓度，反演长时间序列悬浮体质量浓度，定量分析了渤海湾近一年悬浮体质量浓度变化特征及其影响因素。结果表明：受风浪影响，该区悬浮体质量浓度具有明显季节性变化特征，风浪作用强烈的季节其悬浮体浓度表现为相对高值。悬浮体净输运同样具明显季节性变化，秋冬强风浪作用下，悬浮体的净输运量明显增加；而在不同季节，月净输运方向具有不同的主输运方向。悬浮体质量浓度日变化受潮流控制明显，长周期变化则主要与风场的变化有关。潮流涨急过程与风致大浪过程均可引起沉积物再悬浮，导致悬浮体浓度明显增高。

ANNUAL VARIATION OF SUSPENDED SEDIMENT CONCENTRATION IN BOHAI BAY BASED ON ADCP

Based on the measured intensity of echosignal of ADCP,and combined with the short-term synchronous measurement of suspended sediment concentration(SSC),the SSC of long time series is inverted,and the variation characteristics and influencing factors of SSC in Bohai Bay in the past year were quantitatively analyzed.The results show that the SSC in this area has obvious seasonal variation under the influence of wind and wave,and the concentration is relatively high in seasons with strong wind and waves.The net transport of suspended solids per unit width also has obvious seasonal variation.Under the action of seasonal strong wind waves,the net transportation of suspended solids increases obviously.In different seasons,however,the net transport direction of suspended solids per month has different main transport direction.The net transport of SSC also has obvious seasonal variation.Under the action of seasonal strong wind waves,the net transport of suspended solids increases significantly;and in different seasons,the net monthly transport direction is different.The diurnal variation of SSC is obviously controlled by tidal current,while the long-term variation of SSC is mainly related to the variation of wind field.Both the process of rapid tidal current and the wind-induced waves can cause sediment resuspension,resulting in a significant increase in SSC.