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滨江水体底质污染分层释放规律研究及应用

Keywords: 滨江水体,底泥,释放,内江

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Abstract:

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%.

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