雅鲁藏布江中游游荡型河道演变规律及趋势预测  

Riverbed Evolution Characteristics and Trend Prediction of the Wandering Channels in the Middle of Yarlung Zangbo River

作　　者：侯极[1] 周勤[1,2] 张春泽[1] 米家杉 HOU Ji;ZHOU Qin;ZHANG Chun-ze;MI Jia-shan(The Southwest Waterway Engineering Institute,Chongqing Jiaotong University,Chongqing 400016,China;State Key Laboratory of Hydraulic and Mountain River Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]重庆交通大学西南水运工程科学研究所,重庆400016 [2]四川大学水力学与山区河流开发保护国家重点实验室,成都600065

出　　处：《科学技术与工程》2018年第28期143-150,共8页Science Technology and Engineering

基　　金：重庆市基础科学与前沿技术研究专项(cstc2016jcyjA1937);重庆市教委自然科学基金(KJ1600535);重庆交通大学内河航道整治技术交通行业重点实验室开放基金(NHHD-201513)资助

摘　　要：雅鲁藏布江的演变受到水流泥沙的影响外,地壳运动、高原抬升、气候变化等对其作用显著,多重叠加作用下的演变较为复杂。根据收集研究河段的水文泥沙、实测地形及历史卫星影像等资料,分析雅鲁藏布江中游游荡型河段的洲滩变化、主槽与支汊的变化和河相关系,探索雅鲁藏布江中游游荡型河道的演变规律。研究结果表明,雅鲁藏布江中游游荡型河道河谷的宏观边界基本由高山控制;雅鲁藏布江的游荡不仅与宽深比有关,河岸的约束性、河道比降及床沙粒径对游荡型河道影响也较大;根据河相关系分析,拉萨河口至泽当段稳定性稳定性较差,进一步游荡的趋势明显;米林至尼洋河口段则相对稳定。Because of the superposition of multiple factors,the evolution of the Yarlung Zangbo River is very complicated,not only affected by the movement of flow and sediment,but also affected by crustal movement,and the uplift of the Qinghai-Tibet plateau,and the variation of climate.According to the data of hydrology,sediment,channel topography and satellite images of the river reach,the evolution of the wandering channel in the middle of Yarlung Zangbo river was tried to discuss by analyzing the changes of shoals and the main channel,the hydromorphology relation.The results show that the macroscopic boundary of the wandering river valley in the middle reaches of the Yarlung Zangbo River is controled by the mountains;the wandering of the river is not only related to the ratio of width and depth,but also the influence of the riverbank constraints,the slope of channel and the diameter of sediment.According to the analysis of hydromorphology relation,the stability of channel in the Lhasa estuary to Zedong section is rather poor and the trend of further wandering is obvious,while the stability of channel in Milin to the Neyang estuary is relatively stable.

关 键 词：雅鲁藏布江 游荡型河道 河床演变 河相关系 

分 类 号：TV147.1[水利工程—水力学及河流动力学]