里运河底泥CODCr和NH3-N释放对水质的影响实验

通过利用长江水体作为上覆水的里运河表层底泥的释放实验研究，分析了表层底泥中CODCr和NH3—N在静置和3种扰动条件下的释放规律，结果发现城区段底泥中CODCr和NH3—N的释放强度大于非常区段，底泥孔隙水与上覆水之间的浓度梯度增大促进了底泥中污染物质的更快更多地释放。同时得出了各个断面表层底泥中CODCr，和NH3-N的释放强度，在扰动条件下的释放强度远大于静置条件下的释放强度，底泥中污染物质的释放可能会在一定程度上影响里运河将来的调水水质。

Influence Experiment of Release of CODCr and NH3-N in Sediment on Water Quality of the Liyun River

The release experiments of CODCr and NH3-N of surface sediments of the Liyun River were carried out. The overlying water used in experiments was taken from the Yangtze River. The experiments were completed under undisturbed and 3 kinds of disturbed conditions respectively. Results showed that the release intensity of CODCr and NH3-N in sediments belonging to city zone reach was more than that in downstream reach. The increased grads of concentration between sediment hole-water and overlying water lead to a faster and bigger release intensity of CODer and NH3-N. The release intensities of CODCr and NH3-N in surface sediments of each reach sections were analyzed. It indicated the release of CODer and NH3-N from sediments,especially under disturbed conditions,maybe influence at a certain extent the water quality of the Liyun River in future.