摘要
在分析年平滩流量与来水来沙关系的研究中多关注当年或多年水量、沙量、水沙系数等总量特征参数,部分研究中增加考虑了洪峰峰值等特征参数,而针对流量过程对年平滩流量影响的研究较少。通过花园口断面1954-2000年实测流量过程及大量实测断面资料,采用流量历时曲线法来描述流量过程,采用改进的WOL方法估算实时平滩水位,进而估算年/实时平滩流量,分析流量历时曲线特征参数与年/实时平滩特征之间的关系。分析认为,在流量峰型扁平时,断面的年/实时平滩水深基本不变,断面形态变化不大;当流量峰型尖瘦时,断面的年/实时平滩水深变化较大,断面形态变化较大。分析认为,影响年平滩流量的水沙特征参数除水量、沙量、水沙系数等表征总量特性的参数外,还应该适当考虑流量过程的影响,即流量过程峰型相对尖瘦时年/实时平滩流量均变化较大。
The analysis of the relationship between annual bankfull discharge and inflow mainly focuses on the quantity of runoff and sediment load at the annual scale(such as water amount,sediment load,and water-sediment coefficient).Some researchers may also consider some specific characteristics such as peak discharge.However,few studies focus on the discharge hydrograph.We collected measured data of discharge and cross-sections at Huayuankou Hydrology Station during 1954-2000,and adopted flow duration curve(FDC)to describe the discharge hydrograph.Then,we used improved MOL method to estimate the bankfull discharge at different temporal scales,both annual and real-time.The relationship between the coefficients of FDCs and bankfull depth(annual and real-time)was investigated.The analysis showed that when the discharge changed dramatically,the bankfull discharge was more likely to change,and so was the morphology of cross-sections.In conclusion,in addition to the quantity of runoff and sediment load,discharge hydrograph may also influence the bankfull discharge(annual and real-time).
作者
贺莉
HE Li(Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of GeographicSciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)
出处
《南水北调与水利科技》
CSCD
北大核心
2018年第3期38-44,共7页
South-to-North Water Transfers and Water Science & Technology
基金
国家自然科学基金(51109198
51579230)~~
关键词
流量过程
平滩流量
断面形态
花园口
discharge hydrograph
bankfull discharge
morphology of cross-section
Huayuankou hydrological station