风力影响下湖泊湍流特征及其对湖泊污染沉积物影响研究  

Study on Turbulence Characteristics of Lakes under the Influence of Wind and Its Influence on Polluted Lake Sediments

作　　者：李燕 顾圣海 LI Yan;GU Sheng-hai(Nantong Hexin Engineering Survey and Design Institute Co.Ltd.,Nantong 226000,Jiangsu,China)

机构地区：[1]南通和信工程勘测设计院有限公司,江苏南通226000

出　　处：《水利科技与经济》2021年第5期7-12,共6页Water Conservancy Science and Technology and Economy

摘　　要：湖泊水体内的悬浮物浓度是衡量水质的重要参数,悬浮物浓度则受到湖底沉积物的悬浮沉降过程影响。本次试验测量风速影响下淡水湖泊中的切应力以及湍流动能等参数的变化,并建立风速与悬浮物浓度、切应力、湍流动能的拟合曲线,计算得到底泥起悬时的临界风速值为4.5 m/s,影响沉积物悬浮的切应力主要为波切应力,湍流动能与切应力和悬浮物浓度均呈正相关关系。试验结果可为淡水湖泊水质治理提供参考。The concentration of suspended solids in lake water is an important parameter to measure water quality,and the concentration of suspended solids is affected by the process of suspended sedimentation of lake bottom sediment.In this experiment,the change of shear stress and turbulent kinetic energy in fresh water lakes under the influence of wind speed was measured,and the fitting curves of wind speed and suspended solids concentration,shear stress and turbulent kinetic energy were established.The critical wind speed of sediment suspension was calculated to be 4.5m/s,and the main shear stress affecting sediment suspension was wave shear stress,turbulent kinetic energy is positively correlated with shear stress and suspended solids concentration.The test results can provide reference for water quality control of freshwater lakes.

关 键 词：悬浮物浓度 风速 切应力 湍流动能 

分 类 号：X171.1[环境科学与工程—环境科学]