关键词: 特小流域, 特征关系, 复相关方程, 暴雨洪水分析

Abstract: For minibasin, in the establishment of single correlation between peak discharge and drainage area to calculate flood peak, some problems including scattered data, small correlation coefficient and so on are existed. For this reason, we established multiple correlations between flood peak and drainage area, watercourse length and channel gradient, and discovered that in the hydrograph, the data is distributed linearly in concentrated and narrow-banded ways. With the linear characteristic, we can fit the data and obtain the multiple correlation equation and by extending from the spectrum end of small value, we can calculate the peak discharge in minibasin. Compared with single correlation, the multiple correlation coefficient is improved from 0.88 to 0.98, the data proportion inside the enveloping line deviated 10% from correlation line is upgraded from 20% to 80%. The results show that the multiple correlation theory is characterized with sufficient theoretical basis, comprehensive consideration and reliable results, so it is a reasonable and effective way to calculate storm flood in minibasin.

Key words: minibasin, characteristic relation, multiple correlation equation, storm flood analysis