摘要
以长江中游荆江河段为研究对象,依据2002―2016年的断面地形资料,分析了该河段的崩岸特点;统计了不同年份内沿程各断面的水上坡比和水下坡比值,建立了相应的概率密度函数,以此为基础确定了荆江段的稳定坡比。研究结果表明:1)荆江段左岸坡比大于右岸,且典型崩岸区域的坡比值通常较大;2)上、下荆江段的水下坡比均可以采用对数正态分布函数来描述,相关系数均超过0.95;3)基于建立的概率密度函数,结合崩岸断面的占比,确定了荆江段河岸的水下稳定坡比为0.3,水上稳定坡比为0.5;4)采用2016―2018年的实测地形资料,对提出的稳定坡比进行验证,表明这些统计特征值能较好地对崩岸情况进行判别。
Based on the cross-sectional topography data from 2002 to 2016 of the Jingjiang reach in the middle reaches of the Yangtze River, characteristics of bank collapse in this reach were analyzed. The above-water surface bank slope(AWS) and under-water surface bank slope(UWS) in different years were calculated, and the corresponding probability density functions were established. On the basis, the critical bank slope was determined. Results show that: 1) the mean bank slope on the left side of the Jingjiang reach is larger than the mean bank slope on the right side, and in the major bank collapse areas, the bank slope is obviously higher;2)the UWS distribution of upper and lower Jingjiang reaches can be described by a lognormal distribution function, with a correlation coefficient of 0.95;3) based on the established probability density function and the proportion of bank collapse sections, the critical values of the UWS and AWS in the Jingjiang reach are determined to be 0.3 and 0.5, respectively;4) the proposed stable bank slopes are verified based on the measured topographic data in the reach from 2016 to 2018, which shows that these statistical eigenvalues can better distinguish the bank collapse situation.
作者
齐家露
夏军强
邓珊珊
周美蓉
李诺
QI Jialu;XIA Junqiang;DENG Shanshan;ZHOU Meirong;LI Nuo(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2022年第10期993-1001,共9页
Engineering Journal of Wuhan University
基金
国家自然科学基金项目(编号:51725902,U2040215,52009095)
中国博士后科学基金资助项目(编号:2020M682476)。
关键词
河道崩岸
稳定坡比
对数正态分布
荆江河段
riverbank collapse
stable bank slope
lognormal distribution
the Jingjiang reach
