底泥污染物释放水动力特性实验研究  

An experimental study on release of pollutants from sediment under hydrodynamic conditions

作　　者：李彬[1] 张坤[1] 钟宝昌[1] 王道增[1] 

机构地区：[1]上海大学,上海市应用数学和力学研究所,上海200072

出　　处：《水动力学研究与进展（A辑）》2008年第2期126-133,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(No.10572084)资助;上海市重点学科(No.Y0103)资助

摘　　要：在环境水动力学中,河口地区的河流底泥污染物释放扩散特性的研究越来越受到人们的重视。实际上,污染物在底泥和上覆水体之间的释放扩散,对上覆水体水质有很大影响。底泥污染物释放扩散受到底泥本身物理性质和上覆水体水动力特性的共同作用。本文对底泥污染物向上覆水体释放扩散规律进行了水槽实验,通过对水体中底泥释放污染物COD浓度的测量分析,初步得到了底泥污染物在动水条件下的释放机理。底泥污染物释放主要分为两种形式:一是底泥污染物泥水界面释放,二是底泥污染物起动悬浮释放。随后结合底泥污染物释放的水槽模拟实验,天然河道(苏州河)现场实测资料,对三者进行了分析比较。它们相互符合得较好,所反映的基本规律是一致的,表明了本文实验研究的合理性和可靠性。In terms of environmental hydrodynamics, more and more attention has been attached to pollutants release characteristic from sediments in estuary area. In fact, diffusional exchanges of pollutants between the bed sediment and the overlying water column could greatly affect water quality. This flux depends both on sediment and flow characteristics. With the measurement and analysis of COD, pollutants release characteristics from sediments upward overlying water are studied by flume experiment. The mechanism of pollutants release from sediments is obtained initially. Pollutants release from sediments is composed of tow parts： Sediment-Water Interface release and Resuspension release. Then, Results of experimental study on mechanism, simulating experimental results and the first-hand observed data in Suzhou Creek are compared. They fit well for each other, and show the correctness and reliability of experimental study on mechanism.

关 键 词：底泥 界面释放 再悬浮释放 水动力 

分 类 号：X501[环境科学与工程—环境工程] TV131.2[水利工程—水力学及河流动力学]