潮汐型湖泊水体透明度灰关联分析

 受外域水体特征及潮汐作用影响，滨江潮汐型湖泊水体透明度影响因子复杂多变。以镇江内湖为例，基于洪、枯两季典型全日潮野外同步实测结果，运用灰色系统理论，定量计算了内湖水体透明度与相关环境因子的灰关联度，分析研究了不同时间尺度下内湖透明度的主要影响因子。结果表明：洪季，影响内湖透明度的关键因子是悬沙浓度与高锰酸盐指数；枯季，来水含沙量降低，主要影响因子为高锰酸盐指数与叶绿素a浓度；洪、枯两季，内湖水体透明度主要影响因子的排列顺序受潮汐作用影响较小；NH₃-N等间接影响因子对透明度影响不明显，但随涨落潮仍呈现一定变化。

Grey Relational Analysis on Water Transparency for Tide-influenced Lakes

Under the impact of tide and runoff, the influencing factors on water transparency of waterfront tide-influenced lakes always change with a high frequency. The Inner Lake in Zhenjiang City was taken as an research area. Based on the field investigated data during two typical tidal cycles in flood season and dry season, the grey relational degrees between water transparency and certain environmental factors were quantificationally calculated with the grey system theory, and the key influencing factors in different periods were investigated. It was found that in flood season the concentration of suspended solids and CODMn were the key factors influencing water transparency; during and the dry season, CODMn and chl-a were the dominant factors due to the decreased suspended solids concentration. The sequences of key influencing factors in both flood season and dry season rarely changed with the tide-induced impact. Some indirect impact factors of transparency, e.g. NH3-N, were not obvious but changeable to the tidal process to some extent.