摘要
中国西部存在大量比降大、相对光滑度小、河床组成粒径粗的山区大比降河流，本文针对其河流特性，选择寸滩河段作为代表计算河段，搜集了1954～2007年5233组实测资料作为基础资料，分析比较了6个经典推移质无量纲输沙公式的计算精度。参照计算精度最高的Frcdsoe（1976）式的思路，假设输沙强度①与有效水流强度Θ＊成幂次关系，以水流强度与泥沙起动临界水流强度为主要变量，建立了寸滩河段的推移质无量纲输沙公式。通过对比，本文公式能很好地反映寸滩河段推移质输沙规律，计算精度较经典公式有一定提高，可为该河段的水沙研究提供借鉴与参考。
In western China many mountain rivers are featured with large bed slope, coarse particle size, less relative smoothness. The Cuntan river reach, typical of such characteristics, were selected in this study for calculation. We collected totally 5233 pairs of data for the period from 1954 to 2007, and made a comparative analysis on six classical formulae of bedload transport all in dimensionless forms and their calculation accuracies. Following the idea of Fredsoe＇s formula （1976） that is the most accurate, we assumed that sediment transport intensity varies exponentially with effective stream flow intensity, and have developed a dimensionless formula of bedload transport with two main variables, i.e. flow strength and critical flow strength for incipient sediment motion. Verification and comparison show that this formula works well for the bedload transport in the Cuntan reach and it can give a calculation accuracy higher than that of the classic formulae.
出处
《水力发电学报》
EI
CSCD
北大核心
2015年第3期61-65,共5页
Journal of Hydroelectric Engineering
基金
国家自然科学基金资助项目(50579041)
关键词
河流泥沙工程学
无量纲输沙率
推移质
山区大比降河流
寸滩河段
river sedimentation engineering
dimensionless sediment transport rate
bedload
mountain river
Cuntan reach
作者简介
楚万强（1976－），男，讲师，硕士，287109894@qq．com
