辽河口悬浮泥沙时空变化特征及其动力因素分析

Spatio-temporal variation of suspended sediment and its dynamic factors in Liaohe Estuary

基于2019—2020年HY-1C CZI的L2B级泥沙数据和同期气象、水文数据,应用空间分析和统计方法开展辽河口海域悬浮泥沙质量浓度的时空变化特征及其动力因素分析研究。结果表明:潮汐是该海域悬浮泥沙日变化的主导因素,落潮期平均悬浮泥沙质量浓度高于涨潮期;径流对辽河口海域悬浮泥沙质量浓度影响的范围主要在近岸区域,一般不超过5 m等深线;当落潮流流向与风向相反时,浑浊带常横向扩展,而当落潮流流向与风向相同时,浑浊带则收缩在辽河口顶部;风速与悬浮泥沙质量浓度存在显著相关性,离岸越近,风对悬浮泥沙的作用越强烈,这可能与风、浪的协同作用有关;受潮流、径流和风浪的影响,8 m等深线内侧通常发育为最大浑浊带。

Based on the L2B sediment data of HY-1C CZI from 2019 to 2020 and the meteorological and hydrological data of the same period,spatial analysis and statistical methods were applied to analyze the spatio-temporal variation characteristics and dynamic factors of suspended sediment mass concentration in the sea area of Liaohe Estuary.The results show that tide is the dominant factor in the diurnal variation of suspended sediment,and the average suspended sediment mass concentration at ebb period is higher than that at flood period.The influence of runoff on suspended sediment mass concentration in the Liaohe Estuary is mainly in the shore area,and generally does not exceed 5 m isobath.When the flow direction of ebb current is opposite to the wind direction,the turbidity zone expands horizontally in the estuary,while when the flow direction of ebb current is the same as the wind direction,the turbidity zone contracts at the top of the estuary.There is a significant correlation between wind speed and suspended sediment mass concentration,and the closer to the offshore,the stronger the effect of wind on suspended sediment.Under the influence of tidal currents,runoff and wind waves,the inner part of the 8 m contour usually develops into the maximum turbidity zone.