大沽夹河流域径流年内分配特征的量化研究

采用Mann-Kendall法和最小方差法，对大沽夹河流域1966~2004年逐月实测径流数据进行均值变点分析，根据变点分析结果，将径流划分为水文变化特征相似的4个时段，并分析了各时段年内分配不均匀系数、集中度和集中期及变化幅度等特性。结果表明:（1）大沽夹河流域径流年内分配十分不均匀，径流量主要集中在6~10月份，11月至次年4月所占比重不大。（2）1966~1971年和1982~1996年的年内分配特征比较接近，1972~1981年和1997~2004年的比较相似。（3）1997~2004年的径流年内分配特征发生了较大变化（年内分配极不均匀、集中度较高、变化幅度较大等），致使流域水资源开发利用的难度加大。

A Study on the Quantification of Annual Runoff Distribution Characteristics in the Dagujia River Basin

Manne-Kendall and minimum variance methods were applied to analyze the average value change-point of the runoff data in Dagujia River basin from 1966 to 2004,based on this results,the runoff was divided into four periods.And then the change of annual runoff distribution in Dagujia River basin was discussed by using the index of unevenness,degree and time concentration,and variation range etc.The results showed that:(1) The annual runoff distribution in Dagujia River was very uneventful,the runoff mainly concentrated in Jun to Oct.(2) The annual runoff distribution during 1966～1971 was very similar to that of 1982～1996,and the 1972～1981 was almost similar to 1997～2004.(3) The annual runoff distribution has changed a lot during 1997～2004,which caused more difficulty in exploiting and using the water resource.