径流变化特征分析及生态需水保证率评估

采用M-K法对径流序列进行趋势分析和突变检验,以突变前序列作为计算生态需水的依据;其次采用Tennant法、最枯月平均流量法、Texas法和7Q10法计算生态需水;在此基础上,计算各断面全序列生态需水保证程度,并结合典型年过程进行具体分析。以淮河干流息县、王家坝、鲁台子、蚌埠4个关键断面为研究对象。结果表明,4个断面径流序列分别在1980年、1984年、1977年、1989年发生突变;非汛期的生态需水值分别为16.2、33.6、106.5、124.4 m³/s。

Analysis of Runoff Change Characteristics and Assessment of Ecological Water Demand Guarantee Rate

The M-K method is firstly used for trend analysis and mutation testing of runoff series,and the sequence before the mutation is used as the basis for calculating ecological water demand.Secondly,the Tennant method,the driest monthly average flow method,the Texas method and the 7Q10 method are used to calculate the ecological water demand.Finally,based on the calculation of the full sequence of ecological water requirements for each section,the specific analysis is carried out in conjunction with the typical year process.Four key sections of Xixian,Wangjiaba,Lutaizi and Bengbu at the main stream of Huaihe River are taken as the research objects,and the results show that the runoff sequence of the four sections had abrupt changes in 1980,1984,1977 and 1989 respectively,and the ecological water requirements of the four sections during the non-flood season are 16.2 m³/s,33.6 m³/s,106.5 m³/s and 124.4 m³/s respectively.