污染底泥及其间隙水分层特性的模拟实验研究

底泥冲刷沉降、再悬浮是作用于水环境内源污染的主要因素，而底泥间隙水的污染释放则是主要途径。通过底泥培养实验，研究了污染底泥及其间隙水的分层特性。结果表明，底泥及其污染物具有显著的分层特性。底泥间隙水中CODMn随深度的增加略有下降的趋势；底泥湿容重和干容重呈增大的趋势；含水率随底泥深度的增加而减小。底泥深度对底泥泥沙颗粒的级配有很大影响，在表层以细颗粒为主，随着深度的增加．底泥粒径增加，但趋势衰减较快。这对底泥冲刷作用下的再悬浮有很大影响。

Experimental research on the layering characteristics of contaminated bottom sediment and its pore water

Scour, deposition and resuspension of bottom sediment are the key factors that dominate the action of endogenic contaminants in natural water system, and as a result of those processes, releasing of contaminants in pore water acts as a main polluting approach. By culturing experiment of bottom sediment, research on the layering characteristics of contaminated bottom sediment and its pore water was carried out. The results show that, bottom sediment and the contaminants in it vary distinctively along depth. The concentration of organic contaminant reduces, the wet and dry density of bottom sediment rise, and water content declines, following the increasing of depth. Additionally, the layering characteristics influence the grain size distribution in different depth significiantly, which showed that there is fine gain in surface layer of bottom sediment, and with the depth increasing, grain-size rises. But the tendency falls off quickly with the depth, which acts on scouring of contaminated bottom sediment seriously.