中文摘要：

通过室内模拟实验，研究了底泥盐度释放的变化规律并定量计算了底泥盐度释放通量；基于室内实验结果，建立并率定了底泥盐度释放的概念模型；以鉴江河口为例，运用所建模型，定量预测了不同水文条件下，河口水库水质淡化的趋势。结果表明：①在同一换水周期下，底泥盐度的释放受底泥本底间隙水盐度的影响，本底间隙水盐度越大释放量越大；初期，底泥盐度释放强度较大，但随着换水周期的累加，底泥盐度释放逐步降低；②河口蓄淡水库在蓄淡初期，水质（盐度）逐步增加，到一定限值后又逐步递减；淡化时间与来水频率呈正比关系，丰水期淡化时间较短，枯水期则较长。

英文摘要：

Based on the laboratory experiment, the mechanisms of sedimentary salinity release was studied and the release flux was calculated. With the results from the laboratory experiment, the sedimentary salinity release model was established and validated. The model was applied to forecast the desalting tendency in Jian jiang River Estuary under different hydrology conditions. It was found that： （1） under the same water exchange period, the sedimentary salinity release was mainly influenced by the salinity in overlying water, and the intensity of the sedimentary salinity release was higher at the initial stages, and decreased gradually with time increasing. （2） After the water reservation in the Jian jiang River Estuary, the salinity was gradually increased, but the salinity decreased when it reached the maximum value. The desahing time was in a direct proportion with the inflowing water frequency, and the desahing time in the flood seasons was always shorter than that in the dry seasons.