黏性泥沙絮团强度的试验研究综述

A review of experimental study on floc strength of cohesive sediment

絮凝是河口地区水沙交换过程中极为重要的一环,动水絮凝过程可概括为:颗粒碰撞—有效碰撞黏结—絮团重构—絮团破裂—絮团再形成,最终絮团达到动态平衡状态,这是絮团强度在紊动剪切作用下的结果。从絮团强度的试验研究角度回顾了国内外研究进展,此方面研究多围绕絮凝的影响因素与絮团强度的特征参数之间的定性规律、经验或半经验定量关系的角度展开,采用不同的观测装置、设备和技术,以期对絮凝动力学得到更为深入的认识。

Flocculation of cohesive sediment is prevalent in water and sediment exchange proces. This process can be included as： collision-cohesion-restructuring-breakage-reaggregation,and a final dynamic balance can be reached which is the result of floc strength under a given shear rate. In this review,the experimental investigation on floc strength is summarized. Such investigation is primarily conducted by establishing the qualitative,semi-empirical and empirical relationship between the impact factors and floc strength characteristic with a wide variety of observation devices and techniques.