东平湖表层沉积物粒度空间分布特征及影响因素

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东平湖是黄河下游地区最大的蓄洪湖泊,大汶河是其唯一入湖河流.对东平湖33个表层沉积物样品进行粒度分析,探讨了东平湖表层沉积物粒度组成及空间分布特征.研究结果表明,受物质来源和流域降雨量变化影响,东平湖表层沉积物粒度各组分及分布特征具有明显的空间差异性.东平湖表层沉积物粒度组分以粉砂为主,平均含量达79.71%;黏土次之,占16.76%;砂含量最少,仅占3.51%.平均粒径、砂、黏土分别呈舌状自东南向西北方向延伸,粒度分异作用明显.东平湖现代表层沉积物主要来自大汶河搬运与一定比重的湖岸侵蚀崩塌产物,表层沉积物来源的确定有待于今后进一步结合物源示踪分析来准确判定.该研究对于深入认识东平湖地区水动力条件及物质输入状况、入湖污染物的迁移扩散规律等均具有重要意义.
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