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.
Parpal dumplin首次发现于一个叫做克罗默浅滩白垩质河床的地方，它的发现是一个叫做“海洋研究”项目的一部分。
Parpal dumplin was first discovered in a place called the Cromer Shoal Chalk Beds as part of a project called Seasearch.
根据实测地形和水文泥沙资料，分析了葛洲坝枢纽运用后宜昌河段的河床冲淤变化、推移质和床沙的粗化以及枯水位的变化。
The river channel change, the bed load and bed material armoring, and the water level lowering after the operation of the Gezhouba project are analyzed based on the topographic and hydrologic data.
该模型考虑了非均匀推移质不平衡输移，并引入混合层模式用于模拟河床组成的变化。
This model takes into account non-equilibrium transport of non-uniform bedload and introduces the mixed layer model to calculate the changes of bed material grain class.
该模型考虑了非均匀推移质不平衡输移，并引入混合层模式用于模拟河床组成的变化。
This model takes into account non-equilibrium transport of non-uniform bedload and introduces the mixed layer model to calculate the changes of bed material grain class.
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