论文部分内容阅读
为探索秦岭南北典型流域径流特征及其降水变化响应,选择月河流域和灞河流域为典型流域,根据两流域干流站1960~2010年逐月径流资料,用距平累积法、非参数Mann-Kendall法和R/S分析法等方法对年代际、月尺度径流特征进行对比分析,并考虑年内降水变化,建立降水径流关系模型,定量分析降水变化和人类活动对径流的贡献率。结果表明,两流域径流具有较高的相关性,趋势变化规律大体一致,径流系数基本相同;径流年际变化中径流深接近,均呈震荡下降趋势,且灞河流域下降趋势更明显;年代际变化均呈W型,突变点均在1985~1987年之间,灞河流域通过显著性检验;灞河流域径流年内分配比月河流域更平均,灞河流域年内径流呈双峰型,月河流域径流年内变化呈单峰型;随着时间尺度的降低,两流域径流相关性降低。
In order to explore the characteristics of runoff and its response to precipitation changes in the typical watersheds in south and north Qinling Mountains, the Yuehe River Basin and the Bahe River Basin are selected as typical basins. According to the monthly runoff data of the main river basins in the two basins from 1960 to 2010, anomalous accumulation method, Mann- Kendall method and R / S method were used to analyze the characteristics of interdecadal and monthly runoff. Taking into account of precipitation variation during the year, a model of relationship between precipitation and runoff was established to quantitatively analyze the contribution of precipitation change and human activities to runoff. The results show that there is a high correlation between the runoff and the trend of the two watersheds, and the runoff coefficients are basically the same. The mean runoff is close to the interannual variation of runoff, showing a downward trend of concussion and a more obvious downward trend in the Tie River basin. The changes were all in the form of W type with mutation points between 1985 and 1987. The distribution of runoff in the Bahe River Basin was more even than that in the Yuehe River Basin during the year. The runoff in the Bahe River Basin was bimodal during the year, During the year, the runoff in the watershed showed a unimodal pattern. With the decrease of the time scale, the runoff correlation of the two watersheds decreased.