地理研究

地理研究 ›› 1992, Vol. 11 ›› Issue (2): 9-16.doi: 10.11821/yj1992020002

• 论文 • 上一篇    下一篇

变动流域滞时方程

靳长兴   

  1. 中国科学院、国家计划委员会地理研究所
  • 收稿日期:1991-03-24 修回日期:1991-10-25 出版日期:1992-06-15 发布日期:1992-06-15

AN EXPRESSION FOR THE VARIABLE BASIN LAG TIME

Jin Changxing   

  1. Institute of Geography, Chinese Academy of Sciences and State Planning Commission of the People's Republic of China
  • Received:1991-03-24 Revised:1991-10-25 Online:1992-06-15 Published:1992-06-15

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摘要： 流域滞时是流域汇流计算和预报中的一个重要因素。本文尝试将流域滞时表示成流域重心长度Lca(流域重心到流域出口断面的河道长度)与汇流速度v之比的函数,从而使流域滞时随汇流速度的不同而不同,而不再是一个常数。长度Lca反映了流域尺度和几何形态对滞时的影响,而汇流速度则反映流域动力条件对滞时的作用。5个小流域的实测资料检验表明结果较为满意。

关键词: 流域滞时, 重心长度, 汇流速度

Abstract: The basin lag time is an important factor in determining the basin hydrology. In this paper the basin lag time was expressed as a function of ratio of channel length from the centroid to the outlet of basin, divided by the velocity of flow at the gauging site at the time of passage of peak discharge. The channel length reflects the basin size and topographic characteristics, and the velocity characterizes the basin dynamic condition. The results of the test on five small basins were satisfactory.

Key words: basin lag time, channel length from the centroid to the outlet of basin, flow velocity