吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 918-925.doi: 10.13278/j.cnki.jjuese.201503207
李勇1, 李海燕2, 赵应权3
Li Yong1, Li Haiyan2, Zhao Yingquan3
摘要:
为了研究河流沉积物粒度对区域气候变化的指示作用,对濠河中游、下游、濠河入淮河口3个典型河床沉积物剖面及石英尾砂的粒度进行了测量。结果显示:3个沉积物剖面按粒度的变化特征均可分成四层,第一层沉积物以细粉砂为主,第二、三、四层以粗粉砂为主,其中第二、三、四层沉积物的粒度频率分布曲线与石英尾砂非常相似,说明大量石英尾砂排入濠河后,沉积物粒度特征由石英尾砂控制。在近30年中,濠河沉积物的粒度随河水动力的变化而出现波动,这种波动与降雨量的年际变化、洪水的发生等自然因素有关,沉积物平均粒径的峰值与降雨量大或洪水发生的年份存在对应关系。濠河沉积物的粒度特征具有濠河流域气候干湿变化的指示意义:粒径粗指示降雨量较多的湿润气候,粒径细指示降雨量较少的干旱气候。
中图分类号:
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