2-2 一、依输砂特性分類 (一) 河床质组成及运移特性 河床质(Bed Material)依其粒径大小可区分为砏土、砂、砾石、 卵石、块石等類别，如表 1.1-1 所示。
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研究认为河床质调整极限是由来沙组成及河床质细化机制决定的。
The occurrence of the lower limit of bed material size is attributed to the grain size composition of incoming sediment and the fining mechanism.
其主要工作内容包括黄河河道断面淤积测验，河道表层河床质取样及颗粒级配分析等工作。
Its main work includes the Yellow river sediment cross-section tests, river bed surface quality sampling and particle size distribution analysis and so on.
模型设计方法主要包括：如何合理选择模型河床质和床沙质，如何确定进口断面加沙量和放水时间等。
The design methods include how to select bed load and bed material within the suspended load and how to determine the feed of the model sand and the time of the experiment.
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