中文摘要：

为揭示浅水湖泊表层沉积物粒度组成特征,解析沉积物粒度分布对沉积物物源和水动力的响应,并为浅水湖泊沉积物营养盐分布特征研究提供支撑。利用激光法对里下河地区4个不同大小和形状的浅水湖泊沉积物样品的粒度进行研究,结果表明：（a）研究区表层沉积物平均粒径随深度增加而减小;（b）面积大的湖泊表层沉积物的中值粒径垂向分布差异较大;（c）面积大且宽的湖泊中的砂粒搬运作用强于面积小且窄的湖泊;（d）对于面积较大的湖泊,湖心区砂粒含量高于湖泊周边区域;（e）粒径的三角分布图显示研究区表层沉积物颗粒大多落入壤粒和砂粒的范畴,表明研究区湖泊水动力活动较强;（f）风浪扰动较大的九龙口沉积物垂向分布连续性较差;（g）蜈蚣湖和得胜湖沉积物平均粒径垂向分布变化不大,表明其水动力条件变化相对较小,与实际调查一致。

英文摘要：

In order to investigate the composition of particle size of surface sediments in shallow lakes, the response of particle size distribution to the source and hydrodynamic characteristics of sediments, and the distribution characteristics of nutrients in sediments of shallow lakes, the particle size of sediment samples from four shallow lakes with different sizes and shapes in the Lixiahe Region were studied. The results are as follows： （a） The average particle size of the surface sediments in the study area decreases with the increase of depth. （b） The vertical distribution of the median grain diameter of the surface sediments in large lakes is significantly different. （c） The transportation capacity for sands of large and wide lakes is stronger than that of small and narrow lakes. （d） For a large lake, the sand content in the central area is higher than in the surrounding area of the lake. （e） The triangular distribution chart of particle size shows that the surface sediments mostly fall into the categories of silt loam and sandy loam, indicating that the hydrodynamic activity of the lakes in the study area is strong. （f） Poor continuity in the vertical distribution of sediments occurs in Jiulongkou Lake with a large amount of wind disturbance. （g） The vertical distribution of the average particle size of sediments in Wugong Lake and Desheng Lake does not change significantly, indicating that hydrodynamic conditions rarely change. These results agree with the field investigations.