基于树木年轮的弯曲河流河湾迁移速率估算  

Estimation of migration rate of meandering river bends based on tree rings

作　　者：刘桉[1,2] 刘成 何耘 LIU An;LIU Cheng;HE Yun(Graduate School of China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Power China Zhongnan Engineering Co.,Ltd.,Changsha 410014,China;Training Department of International Research and Training Center on Erosion and Sedimentation,Beijing 100048,China;Information Center of China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院研究生院,北京100048 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [3]国际泥沙研究培训中心研究培训处,北京100048 [4]中国水利水电科学研究院信息中心,北京100038

出　　处：《水利水电科技进展》2021年第3期61-65,71,共6页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2017YFC0505400)。

摘　　要：针对河流源区缺乏长期的河流监测数据,难以确定河湾迁移速率的问题,通过2016年和2017年2次对黄河源区的实地考察和采样情况,以典型弯曲河流白河的9处河湾为例,根据河湾凸岸淤长与植被演替的关系,利用树木年轮分析判断树龄,依据树木位置和树龄的关系估算弯曲河流河湾迁移速率。估算得出白河9处河湾迁移速率为0.38~6.10 m/a,迁移速率与水流流速、河道比降、凹岸滩高和河谷宽相关,最大迁移速率出现在河湾弯曲度最小的9号河湾。In view of the lack of long-term river monitoring data in river source regions,it is difficult to determine the migration rate of river bends.Through field investigation and sampling in the Yellow River source region in 2016 and 2017,nine river bends of the Baihe River,a typical meandering river,were selected as research examples.The ages of trees were determined by tree rings analysis,and a method for estimating the migration rate of river bends based on the relationship between tree positions and tree ages according to vegetation succession of trees growing on scroll bars in convex bank was used.The migration rates of nine river bends of the Baihe River were estimated to be 0.38-6.10 m/a,and the migration rates were found to be related to the flow rate,channel slope,height of the concave bank and width of the river valley.The maximum migration rate appears in the No.9 river bend where the river curvature is the smallest.

关 键 词：弯曲河流 河湾 迁移速率 树木年轮 黄河源区 白河 

分 类 号：TV143[水利工程—水力学及河流动力学]