近60年来长丰河河道演变规律研究及趋势分析

Study on channel evolution law and trend analysis of Changfeng river in recent sixty years

通过对长丰河的河床的地质构造的勘探及河道大断面冲淤变化、多年平均流量分析,利用坎德尔秩次相关法、斯波曼秩次相关法、线性趋势回归法等三种方法进行检验,发现多年平均流量呈现逐年显著减少趋势,得出:长丰河河道整体趋于稳定,纵横断面变化不大。从河道近几年的变化规律及趋势分析来看,随着多年平均流量的显著减小,河道冲刷也在趋于减小,由于长丰河洪水主要来源于上游暴雨,当汛期来临时,洪水挟带泥沙造成河道拥堵的现象时有发生。建议在必要情况下,应对河道进行不定期清淤。

Through the exploration of geological structure of Changfeng bed of the river and river channel scouring and silting in big cross section changes For many years an average flow analysis, the use of kandel rank correlation method Berman,a rank correlation method and three kinds of methods, such as linear trend regression method to test, found that the average flow rate showed a trend of significantly reduced year by year for many years, it is concluded that:Changfeng river course as a whole tend to be stable, vertical and horizontal section. From the perspective of the change rule and trend analysis of river channel in recent years, along with the years of average flow rate decreased significantly, channel scouring tends to decrease,because the Changfeng river flood mainly comes from the upstream to the rain, when the flood came, the flood of flood sediment of creating congestion phenomena occur Advice if necessary, deal with channel of desilting.