床沙

对试验结果的分析表明：在床沙一定、河流流速与射流流速相比不大的情况下，冲刷坑的几何尺寸与V2／3jD5／6有较好的关系。

Experimental results show that the dimensions of the scoured hole correlate fairly with V 2 / 3 jD 5 / 6 when the bed material is given and the velocity of the river flow is insignificant as compared with the jet flow .

床沙表层非均匀分布对泥沙输移的影响

Effect of Non-uniform Distribution of Bed Material on Transport Rate of Bed load

非均匀卵石河床床沙位置的分布特性

Distribution Characteristics of Bed Load Location for Non-uniform Gravel River Channel

床沙代表粒径与输移泥沙中值粒径的关系

Representative Diameter of Bed Material and Median Size of Sediment in Transport

宽级配床沙起动规律的实验研究

Study on Incipient Motion of Bed Material with a Wide Size Distribution

漫水丁坝坝头床沙起冲流速研究

Study of initial scour velocity of bed sand around submerged spur dikes

双峰型床沙推移质输沙率

Bedload Sediment Transport Rate of Bimodal Bed Material

天然河流床沙级配的计算

Computation of bed-load gradation composition in natural river

床沙粗化研究的回顾

Research on The Roughening of a River Bed

冲积河流混合活动层内床沙级配变化的动力学基本方程

Basic equation for variation of bed material composition in active layer of alluvial river

挟沙能力级配及有效床沙级配的确定

The determination of the size distributions of carrying capacity and of effective bed material

珠江三角洲床沙特征的变化

The Change of the Characteristics of the Riverbed Sand in the Pearl River Delta

河流冲刷过程中表层床沙粗化对不平衡输沙的影响

Effect of Coarsening Surface Bed Material on Non-Equilibrium Sediment Transport Process during River Degradation

这一临界粒径的大小，随不同的床沙而异。

This critical size of motion varies with the variation of grading of sand mixture .

非均匀沙挟沙力是河道水流泥沙运动的重要课题之一。本文采用随机数学的方法，分析了水流与床沙的相互作用及床沙与床沙质的相互交换，建立了非均匀沙挟沙力公式。

In this paper the relationship between flow and sediment in river bed is analyzed using statistics theory .

床沙交换速率愈慢，则冲刷距离愈长。

A slower exchange rate of bed material then leads to a longer distance of non equilibrium sediment transport .

在分析基础上，提出了漫水丁坝坝头床沙起冲流速的计算办法。

Then , the calculating method of initial scour velocity of bed sand around submerged spur dikes is suggested .

文中同时提出了表层床沙粗化的概化计算模式及床沙交换速率计算公式。

A model for calculation of bed material on coarsened surface and a formula for bed material exchange rate are proposed .

主要在床沙与推移质交换的同时，考虑了床沙与推移质向悬移质的净交换。

Especially , while exchanging between bedload and bed material , the net transport of bed load towards waters was considered .

河道比降、床沙组成是河道边界条件中影响河型形成的最主要因素。

Stream gradient and bed sand constituent are the main factors which is influencing on river pattern formation in the boundary condition .

进而论述不平衡输沙时总挟沙能力、挟沙能力级配及有效床沙级配的方程。

The equations for the total carrying capacity and the size distribution of carrying capacity and effective bed material have been presented .

对实验资料进行回归分析，求出了双峰型床沙无量纲推移质输沙率和无量纲的单位水流功率间的关系。

The paper deals with the determination on the grain size of bimodal bed material and the calculation of the threshold stream power .

第四，闸述了不平衡输沙条件下，挟沙能力级配及有效床沙级配的概念。

In the fourth part , the concepts of the size distribution of carrying capacity and effective bed material under condition of nonequilibrium transportation are illustrated .

为探索有关规律，寻找工程设计的依据，对缓流时的漫水丁坝坝头床沙起冲流速进行了尝试性的试验研究，对部分影响因子进行试验分析。

Exploratory experiments and analyses are introduced herein to study the initial scour velocity of bed sand around submerged spur dikes and some factors influencing the velocity .

床沙越粗、组成越不均匀，粗化作用越大，这一临界粒径也越大。

The thicker the sand bed , the non-uniform sand composition , then the larger armouring effect would be and the larger this critical size is correspondingly .

非均匀沙推移质输沙率公式考虑了床沙运动的随机性及床沙粗化对输沙率的影响。

The probability of movement of the bed material and effects of armoring of the bed material are considered in the formula of non-uniform bedload transport capacity .

本文阐述了笔者在研究非均匀悬移质不平衡输沙时引进的两个重要概念：挟沙能力级配及有效床沙级配。

Two important concepts , which have been introduced by the authors in the study on the nonequilibrium transportation of nonuniform sediment , are illustrated in detail .

基于泥沙运动的起动和止动条件分析了悬移质泥沙和床沙交换的内在机理，并根据这一机理推求了冲淤平衡状态下悬移质挟沙力级配的计算公式。

In terms of this mechanism , the calculation formula for the suspended load sediment-carrying capacity graduation under the balanced state of silting and scoring is deduced .

建立了能反映非均匀床沙暴露作用及隐蔽作用的计算非均匀沙起动流速的简化模式，通过专门安排的非均匀沙起动流速试验及分析川江野外观测资料，确定了计算公式的系数。

A simple model used to compute the velocity of threshold motion for each grain size of the non-uniform sediments in consideration of both their expose and shelter actions is established ;

水槽的床沙及水流条件均按模型相似率设计。

The flow conditions and the composition of the bed material corresponding to a typical reach of the river being studied were modeled in the flume according to a certain criteria of similarity .