| 泥沙起动判别标准探讨 |
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| 引用本文： | 何文社,方铎,曹叔尤,杨具瑞,刘兴年.泥沙起动判别标准探讨[J].水科学进展,2003,14(2):143-146. |
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| 作者姓名： | 何文社 方铎 曹叔尤 杨具瑞 刘兴年 |
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| 作者单位： | 四川大学高速水力学国家重点实验室, 四川, 成都, 610065 |
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| 基金项目： | 国家自然科学基金,水利部联合资助重大项目(59890200),"九五"课题资助项目(95 5 4)~~ |
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| 摘 要： | 分析了现有起动标准的不足之处。在制定起动标准时,不但要考虑水流条件,还必须考虑泥沙颗粒在床面的相对位置。对同一粒径的泥沙颗粒,其起动条件不是一个常量,而是位于一个区间,它随颗粒在床面的相对暴露度而变化。根据力学原理,推导了泥沙颗粒起动时的临界无量纲切应力公式,并对其系数取值进行了理论计算。计算结果表明,对同一粒径、在同一起动状态下,泥沙颗粒的起动临界条件并非一个常量。并从理论上分析得到了临界值的范围,对个别及少量起动,其无量纲临界切应力为0.021～0.042及0.041～0.062。
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| 关 键 词： | 泥沙 起动标准 临界切应力 |
| 文章编号： | 1001-6791(2003)02-143-04 |
| 收稿时间： | 2002-01-09 |
| 修稿时间： | 2002年1月9日 |
Study on standards for incipient motion of sediment |
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| HE Wen-she,FANG Duo,CAO Shu-you,YANG Ju-rui,LIU Xing-.Study on standards for incipient motion of sediment[J].Advances in Water Science,2003,14(2):143-146. |
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| Authors: | HE Wen-she FANG Duo CAO Shu-you YANG Ju-rui LIU Xing- |
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| Institution: | State Key Hydraulics Laboratory of High Speed Flows, Sichuan University, Chengdu 610065, China |
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| Abstract: | The shortage of the current standards for estimating the incipient ration of sediment particles is analyzed in this paper. The standards for estimating incipient ration of sediment not only should consider the condition of river flow,but also consider the relative location of sediment grains within riverbed. The condition of incipient rmtion for one diameter grain is not a constant,but a variant located in a region and varying with the relative expose degree of the grain. The formula for calculating the conditions of threshold rmtion is obtained according rolling ride based on force and momentum balances,and the value of dimensionless critical shear stress of each status is calculated theoretically. |
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| Keywords: | sediment incipient motion standards critical shear stress |
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