荆江南岸藕池河东支典型河段河床调整特点研究  

Study on characteristics of riverbed adjustment in typical reach of east branch of Ouchi River on south bank of Jingjiang River

作　　者：孙启航 夏军强[1] 石林 李代军 SUN Qihang;XIA Junqiang;SHI Lin;LI Daijun(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Hunan Institute of Water Resources and Hydropower Research,Changsha 410006,China)

机构地区：[1]武汉大学水资源与水电工程国家重点实验室,湖北武汉430072 [2]湖南省水利水电科学研究院,湖南长沙410006

出　　处：《人民长江》2022年第3期21-28,共8页Yangtze River

基　　金：国家自然科学基金项目(51725902);湖南省重大水利科技专项项目(湘水科技【2017】230-39)。

摘　　要：为研究荆江南岸藕池河东支注滋河段河床调整特点,利用实测水沙及地形等资料,计算了1995~2019年的河段冲淤过程;采用河段平均的方法,计算了该河段平滩河槽形态的调整过程,同时分析了该河段的崩岸过程及其影响因素。结果表明:注滋河段1995~2005年为淤积状态,累计淤积量为667万m^(3);2005~2019年为持续冲刷状态,累计冲刷量为786万m^(3)。2005~2019年该河段上游崩岸数量大于下游,且2005~2006年崩岸次数较其他时间段多。此外还分析了水沙条件与河床边界等因素对崩岸过程的影响,其中水流冲刷强度的持续增加和岸坡土体相对松散(砂土)是造成注滋河段崩岸经常发生的两个主要原因。In order to study the characteristics of riverbed adjustment in the Zhuzihe reach,east branch of Ouchi River on south bank of Jingjiang River,we calculated the scouring and silting volume during the period 1995-2019 based on the measured water,sediment and topographic data.The geometry of this bankfull channel were calculated by the reach-averaged method,and the bank collapse process and its influencing factors were analyzed.The results showed that the Zhuzihe reach was in a deposition state from 1995 to 2005,with a cumulative deposition volume of 6.67 million cubic meters,while it was in a continuous erosion state from 2005 to 2019,with a cumulative erosion volume of 7.86 million cubic meters.From 2005 to 2019,the number of bank collapses in the upper reaches of the river was more than that in the lower reaches,and the times of bank collapses from 2005 to 2006 was more than that in other time periods.In addition,we analyzed the influence of factors such as water and sediment conditions and riverbed boundary on the bank collapse process,among which the continuous increase of scouring intensity and the relatively loose soil(sandy soil)on the bank slope were the two main reasons for the frequent bank collapse in the Zhuzihe reach.

关 键 词：河床调整 平滩河槽形态 崩岸特点 注滋河段 藕池河 

分 类 号：TV147[水利工程—水力学及河流动力学]