中文摘要：

研究了镇江内江底泥淤积及污染物含量空间分布特征；基于底泥污染物分层释放试验，建立内江不同区域底泥污染释放强度随水体流速关系曲线；建立了考虑内源释放的二维非稳态FVS格式水流水质模型，定量评估了内江拟开展的疏浚工程所产生的环境效应．结果表明：内江底泥淤积及污染物含量分布较不均匀，南部滩地底泥淤积严重且污染物含量较高；底泥污染物含量由表层至底层基本呈现逐步递减趋势；在相同流速条件下，表层底泥污染释放强度大于中间层，中间层底泥TN、TP、COD释放强度平均约比表层底泥分别降低了40．8％、32．1％、28．3％；疏浚措施后，内江底泥污染释放强度显著减弱，洪、枯两季典型全日潮内源污染释放总量较现状条件下平均削减了26．3％、22．3％．

英文摘要：

The spatial characters of accumulated sediment, pollutant content distribution in sediment in Neijiang were systematically analyzed. By conducting the layered sediment nutrient release experiment, the relationship between sedimentary pollutant release intensity and water velocity was induced for each divided area in Neijiang. A 2-D unsteady flow-water quality numerical model which contained the internal pollutant release was established and the post environmental impact of the dredging program in Neijiang was quantificationally estimated. It was found that the sediment deposition and pollutant content in sediment in Neijiang were asymmetrically distributed and the thickness and pollutant content of the deposited sediment in the south area of Neijiang were higher than that in other areas. Generally the pollutant content in sediment decreased from the surface layer to the bottom layer, and the release intensity of TN, TP, COD of the middle layer was averagely decreased by 40.8% , 32. 1% , and 28.3% than that of the surface layer respectively. After the dredging program the intensity of internal pollutant release in Neijiang was obviously weakened and the total amount of internal pollutant release during the tidal cycles in flood and dry season were reduced by 26.3% and 22.3% respectively than that under the present condition.