| 孟震,陈槐,李丹勋,王兴奎.推移质平衡输沙率公式研究[J].水利学报,2015,46(9):1080-1088 |
| 推移质平衡输沙率公式研究 |
| Study of bed-load transport formulas |
| 投稿时间：2014-09-23 |
| DOI：10.13243/j.cnki.slxb.20141151 |
| 中文关键词: 推移质输沙 起动条件 冲刷率 起动概率 |
| 英文关键词: bed-load transport incipient motion scour rate incipient probability |
| 基金项目:国家自然科学基金项目(51279081);国家科技支撑计划项目(2012BAB04B01) |
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| 中文摘要: |
| 将确定性方法和随机性方法相结合,以单位时间内单颗粒泥沙的交换次数代替交换时间,基于颗粒受力平衡推导了推移质颗粒的平均运动速度。结合Bagnold水流功率和Einstein起动概率的基本概念,推导了一个推移质平衡输沙率公式。该公式的系数在临界起动时较小,但随水流强度的增加而增大,从而避免了诸如Meyer-Pe?ter、Einstein、Bagnold、Yalin及Engelund等经典推移质公式难以兼顾低强度和高强度输沙率计算的问题。利用经典的推移质输沙率实测数据检验了本文公式,表明该公式具有较好的适用性。 |
| 英文摘要: |
| The authors propose a new bed-load transport formula based on the concept of stream power by Bagnold and the theory of incipient probability by Einstein. The formula takes the advantages of both deterministic and probabilistic approaches, and it assumes an exchange frequency to be related to flow intensity and derives the mean velocity of bed-load from equilibrium analysis. Equipped with a coefficient that takes flow intensity into account, the new formula is capable of calculating both low and high bed-load transport rates, when other bed-load formulas tend to perform well in only one end. Validation against measured data reveals that the new formula shows promise as being reliable in estimating bed-load transport rates in a wide range of transport intensities. |
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