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滹沱河是黄淮海平原北部山前冲、洪积扇上具有代表性的河流之一。对其上、中、下段已知河流地貌成因类型沉积亚相(即主流相、心滩相、边滩相和自然堤相)的泥沙进行了粒度、比重、矿物以及石英表面结构的分析。本文概要地叙述了泥沙在河流三度空间里这四个方面的变化。其中比重分析是我们首次对河流沉积物进行系统分析,得到一些饶有兴趣的结果。如在河流纵向上,除自然堤相外,其它各相的泥沙从上段至下段比重都是增大的;在河流横向上,沉积部位由低到高,即由主流相逐渐到自然堤相,泥沙的比重都是变小的;在河流垂向上,由下至上的泥沙比重变化各异。这些均反映了沉积时水动力的变化。比重曲线对沉积泥沙具有一定的划相意义,这对河流沉积和河床演变可能会有一定的研究价值。
Hutuo River Huanghuaihai Plain in northern mountains forewarning, alluvial fan on one of the representative rivers. The grain size, specific gravity, mineral and quartz surface structure of the sediments of the upper, middle and lower reaches, which are known as sedimentary subfacies of the river topography (ie, the main facies, the heartwaters facies, the marginal facies and the natural dike) were analyzed. This article briefly describes the changes of sediment in these three aspects of the river’s three dimensional space. Gravity analysis is the first systematic analysis of river sediments and gives some interesting results. For example, in the longitudinal direction of the river, in addition to the natural dike facies, the sediment of all other phases increases from the upper part to the lower part; in the horizontal direction of the river, the sedimentary parts are from low to high, that is, from the mainstream to the natural dike , The proportion of sediment is smaller; in the vertical direction of the river, the sediment proportion varies from bottom to top. All of these reflect the change of hydrodynamic during deposition. The gravity curve has some significance for sediment deposition, which may have certain value for river sedimentation and river bed evolution.