ABSTRACT

The physicochemical properties of suspended sediment show regional differences. Based on scanning electron microscopy-energy dispersive X-ray spectrometry, we qualified the grain size, roundness, roughness and chemical composition of suspended sediment of four typical waters of the mid-lower Yangtze River Basin. The following results were observed: The grain size and roundness of suspended sediment in Yangtze Estuary were the largest, at 7.45 μm and 1.344, respectively. Grain-size and roundness significantly varied between research points. Water velocity had a positive effect on grain size and roundness. The concentration of suspended solids had a positive effect on roughness. Taking Zn as an example, the results of a comparison of coupled functions with the measured values (average R² = 0.8) indicates that the roundness, roughness and Al content of particles obviously affected the heavy metal adsorption. This study not only explores the environmental effect of the physicochemical of suspended sediment but also provides comprehensive data for the numerical simulation of suspended sediment dynamics.

摘要

悬浮沉积物的理化性质存在地区差异。基于扫描电镜-能量色散X射线光谱仪，我们对长江中下游4个典型水域悬浮沉积物的粒度、圆度、粗糙度和化学成分进行了鉴定。观察到以下结果：长江口悬浮泥沙的粒度和圆度最大，分别为7.45 μm和1.344。粒度和圆度在研究点之间存在显着差异。水流速度对粒度和圆度有积极影响。悬浮固体浓度对粗糙度有积极影响。以Zn为例，耦合函数与实测值（平均R ² = 0.8)表明颗粒的圆度、粗糙度和Al含量对重金属吸附有明显影响。本研究不仅探讨了悬浮泥沙物理化学对环境的影响，而且为悬浮泥沙动力学的数值模拟提供了全面的数据。