摘要
该研究建立了室内水槽概化模型,模拟珠江三角洲典型窄滩复式河道。通过有植被和无植被条件下滩地的水动力特性对比,定性分析滩地有无种树对窄滩复式河道水动力特性的影响。结果表明:受种树影响,种树带进口处水位显著壅高,以此建立经验公式,可用于估算河道种树所引起的上游水位最大壅高量值,从而获得滩地种树对行洪的影响。种树后,水流发生归槽现象,滩地流速、流量沿程减小并最终趋于稳定,主槽流速增大;当滩地水深较大时,受种树带对过水断面的束窄作用,主槽流速在进入种树带后急剧增大,流速的增大有可能引起主槽冲刷增强,加剧河床下切侵蚀。该研究成果不仅能加深对河漫滩水力学的理论认识,同时可为以珠江三角洲为代表的窄滩复式断面河道种树规划设计提供技术依据。
Based on the physical general model,the typical narrow floodplains of the Pearl River Delta are simulated and the influence of plating tree on the hydrodynamic behavior of compound channels with narrow floodplains is analyzed.The raising of water level is found at the beginning of planting.An empirical formula is established,which can be used to estimate the maximum water level caused by planting,so as to obtain the influence of tree planting on floods.After planting trees,the water flows to the river channel,the flow velocity and river discharge of river shoal decrease along the way and eventually stabilized,and the flow velocity of the main channel increases.When the water depth of the river shoal is large,the flow velocity of the main channel increases sharply,resulting in the erosion of the river shoal and river bed.The results of this study can not only deepen the theoretical understanding of the river floodplain hydraulics,but also provide the technical basis for the tree planting in the river shoal of Pearl River Delta.
作者
黄本胜
谭超
陈晖
邱静
HUANG Ben-Sheng;TAN Chao;CHEN Hui;QIU Jing(Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510630, China;Guangdong Provincial Key Laboratory of Hydrodynamics, Guangzhou 510630, China;State-province Joint Engineering Laboratory of Estuarine Hydraulic Technology, Guangzhou 510630, China)
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2018年第3期329-336,共8页
Chinese Journal of Hydrodynamics
基金
国家重点研发计划(2016YFC0402607)~~
关键词
滩地种树
窄滩复式河道
水流特性
planting trees on floodplains
compound channels with narrow floodplains
hydrodynamic behavior
