摘要
河川基流分析计算是山丘区地下水资源量评价的重要内容。以甘肃省112个水文站2001-2016年的逐日平均流量数据为基础,采用数字滤波方法进行基流分割,并对甘肃省内陆河、黄河、长江三大流域的基流量、基径比、基流模数分布规律进行分析。结果表明:所选的水文站年径流量和切割出的年基流量相关系数均在0.9以上,基流量与径流量存在显著的正相关关系。甘肃省2001-2016年多年平均天然河川基流量为91.33亿m3,其中内陆河流域18.21亿m3,黄河流域34.56亿m3,长江流域38.57亿m3。从甘肃省三大流域河川基流量的计算结果来看,基径比和基流模数总体上是:内陆河流域<黄河流域<长江流域。基径比和基流模数分布与该流域降水、径流分布趋势一致。基径比和基流模数受植被条件影响巨大,植被条件好的地区大于植被条件差的地区。
The analysis and calculation of river base flow is an important content of groundwater resources evaluation in hilly area.Based on the daily average flow datas of 112 hydrological stations in Gansu Province from 2001 to 2016,the digital filtering method is used to base flow separation,and analyzed the distribution rules of base flow,base flow index and base flow modulus of inland river,Yellow River and Yangtze River Basins in Gansu Province.The results show that the correlation coefficients of runoff and base flow are above 0.9,and there is a significant positive correlation between base flow and runoff.From2001 to 2016,the annual average natural base flow of Gansu Province was 91.33×108 m3,including 18.21×108 m3 in inland river basin,34.56×108 m3 in Yellow River Basin and 38.57×108 m3 in Yangtze River Basin.According to the calculation results of base flow in three major river basins in Gansu Province,the base flow index and base flow modulus are as follows:Inland River Basin<Yellow River Basin<Yangtze River Basin.The distribution trend of base flow index and base flow modulus is consistent with that of precipitation and runoff.The base flow index and base flow modulus are greatly affected by vegetation conditions,and the areas with good vegetation conditions are greater than those with poor vegetation conditions.
作者
张丽
ZHANG Li(Hydrology and Water resources Bureau of Gansu Province,Lanzhou 730000,China)
出处
《地下水》
2021年第4期195-196,202,共3页
Ground water
关键词
河川基流
数字滤波法
基径比
基流模数
甘肃省
The river base flow
digital filtering method
the base diameter ratio
base flow modulus
Gansu province
