河段平滩流量估算方法及影响因素分析  

Estimation of bankfull discharge at reach scale and influence factor analysis

作　　者：贺莉[1] 

机构地区：[1]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101

出　　处：《水力发电学报》2016年第4期47-54,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51109198;51579230);国家重点基础研究发展计划(2011CB403305);"十二五"国家科技支撑计划课题(2012BAB02B02)

摘　　要：河段平滩流量更能反映这一河段的排洪能力,也可以避免用一个断面时河漫滩高程难以确定及代表性不强的问题。本文根据基于断面几何标准的WOL方法确定断面平滩高程,然后采用收敛法估算河段平滩流量,并应用在内蒙古巴彦高勒至头道拐河段。对比内蒙古河段在1962年、1982年、1991年、2000年及2004年的河段平滩流量,发现收敛河长逐年增大。进一步分析了估算平滩流量过程中各因素(滩槽判定、大断面纵向平均间距及子断面横向平均间距)对估算河段平滩流量的影响,发现主槽判定对平滩流量的影响较大。Bankfull discharge at reach scale possibly contains the influence of various factors in a river reach and hence it is a better representative of the whole reach. This study has estimated such a bankfull discharge and the corresponding bankfull stage using a convergence method and WOL method based on morphological criteria respectively. The bankfull discharge and the convergence river length were estimated from the geometry data of the Inner Mongolia reach of the Yellow surveyed in the years of 1962, 1982, 1991, 2000, and 2004. Analysis shows that the river length for estimating the bankfull discharge at reach scale was increasing from 1962 to 2004. Other influence factors were also examined, including the definition of main channel and the averaged spacings of cross-sections and subsections. It reveals that the definition of main channel could be a significant factor in estimation of bankfull discharge.

关 键 词：河道演变 河段平滩流量 平滩高程 内蒙古河段 黄河 

分 类 号：TV147[水利工程—水力学及河流动力学]