| 冲积河流的极限流速 |
| |
| 引用本文： | 贾艳红,王兆印.冲积河流的极限流速[J].清华大学学报(自然科学版),2009(3). |
| |
| 作者姓名： | 贾艳红 王兆印 |
| |
| 作者单位： | 清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室; |
| |
| 基金项目： | 国家自然科学基金资助项目(50221903-3);;水利部公益性行业科研专项经费项目(2007SHZ0901034) |
| |
| 摘 要： | 为了说明天然冲积河流存在极限流速,整理了长江、松花江等20条冲积河流上25个水文站的日均流量、日均水位、实测大断面、日均含沙量等水文资料,利用水流连续性方程,由日均流量和过水断面面积求出断面平均流速。结果表明,天然冲积河流断面平均流速随着流量的增加而增大,达到一定流量后,断面平均流速趋近于一个极限流速。天然冲积河流流量较大时通过增加过流断面面积使得流速始终低于极限流速。人类活动会影响冲积河流的极限流速。
|
| 关 键 词： | 冲积河流 极限流速 人类活动 |
Limit velocity for alluvial rivers |
| |
| JIA Yanhong,WANG Zhaoyin.Limit velocity for alluvial rivers[J].Journal of Tsinghua University(Science and Technology),2009(3). |
| |
| Authors: | JIA Yanhong WANG Zhaoyin |
| |
| Institution: | State Key Laboratory of Hydroscience and Engineering;Department of Hydraulic Engineering;Tsinghua University;Beijing 100084;China |
| |
| Abstract: | In alluvial rivers that have not been affected by human development,the flow velocities vary within a limited range.This range was studied by analyzing hydrological data,including daily average discharges,sediment concentrations,stages,and cross sections from hydrological stations collected from 25 stations on 20 rivers in China,including the Yangtze,Songhua Rivers,etc. The cross-sectional average velocities were calculated from the discharge and wet area.For alluvial rivers,the wet cross section changes wi... |
| |
| Keywords: | alluvial river limit velocity human activity |
| 本文献已被 CNKI 等数据库收录！ |
|
