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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。
Through indoor simulation experiments, the variation law of sediment salinity release was studied and the sediment salinity release flux was calculated. Based on the laboratory experiment results, a conceptual model of sediment salinity release was established and evaluated. As an example, the model was used to quantitatively predict the trend of water quality desalination in Hekou reservoir under different hydrological conditions. The results showed that: ① Under the same water exchange cycle, the release of sediment salinity was affected by the salinity of the interstitial water in the sediment. The greater the salinity of the interstitial water in the background, the greater the release. The initial salinity release intensity But the release of sediment salinity gradually decreased with the accumulation of water exchange cycles. (2) The water quality (salinity) of Yubei reservoir in estuarine reservoir gradually increased at a certain limit and then decreased gradually. Water frequency is proportional to the relationship, the wet period of the desalination time is short, dry period is longer.