基于集中期的大沽夹河年内水文特征分析

Analysis on Runoff Variation Characteristics in the Typical River Basin of Hilly Area in Shandong Peninsula

选取无过境河流的山东半岛丘陵地区的大沽夹河流域作为研究对象,采用滑动平均、集中期、集中度等方法,在年际、季节、年代及年内各月等时间尺度上,对流域径流的特征进行了较为全面的分析研究。结果显示:大沽夹河1966-2004年间的径流量年际变化呈波浪式减少趋势,没有规律性,波动性较大,变差系数值为0.788。季节上,径流量主要集中在夏秋季节,断流主要出现在春冬季节,夏秋季节断流较少。各年代段的年内平均径流量均集中在6-10月,11月至次年5月径流量很少,最高径流量均为8月。

Taking Dagujia River basin, located in Jiaodong hilly area, as a case study, the characteristic of runoff was analyzed by using moving-average and Cv（Variation Coefficient） methods. Results showed that the annual runoff decreased obviously from 1966 to 2004. It was changing from 0. 00×10^8 m^3to 8.93×10^8 m^3, and the Cv is 0. 788. Seasonal runoff centralized in summer and autumn. Cutoff mainly occurred in spring and winter. The Cv of seasons are all larger. The monthly runoff distribution was very uneventful, it mainly concentrated from June to October, and the largest runoff occurred in August. The decadal analysis of Cd and D showed that the Cd had been increasing from 1966 to 2004, and the maximum D were all in August. It is important to the design of local sustainable development and provide the useful database for water resource planning.