近60年渭河下游自然裁弯成因分析
发布时间：2019-08-08 09:21
【摘要】：渭河下游是典型的弯曲型河道,过去60年频繁地发生自然裁弯,其触发原因、形成过程和演变规律缺少深入的研究。渭河下游的裁弯是河湾横向演变到一定阶段后在汛期洪水冲刷作用下发生临界突变,直接影响河道平面形态、上下游河床冲淤和局部河段的防洪安全。基于原型观测、水沙数据(1960-2013)和遥感影像(1990-2015),分析了渭河下游裁弯事件的水沙条件、影响因素和裁弯时空演变过程及其原因。渭河下游发生的18次裁弯的主要原因是受三门峡建库后渭河下游边界条件的改变,包括潼关侵蚀基准面淤积抬高,凸岸边滩及内侧平原缺少粘性成分,抗冲性差,同时也受渭河下游来水来沙条件的变化及其高含沙洪水的影响。
[Abstract]:The lower reaches of Weihe River is a typical curved channel. Natural bending has occurred frequently in the past 60 years, and its trigger causes, formation process and evolution law are lack of in-depth study. The bending in the lower reaches of the Weihe River is a critical sudden change under the action of flood scour in flood season after the lateral evolution of the river bay to a certain stage, which directly affects the plane shape of the river, the scouring and silting of the upper and lower reaches of the river bed and the flood control safety of the local reach. Based on prototype observation, water and sediment data (1960 / 2013) and remote sensing images (1990 / 2015), the water and sediment conditions, influencing factors, temporal and spatial evolution process and causes of bending events in the lower reaches of Weihe River are analyzed. The main reason for the 18 times of bending in the lower reaches of the Weihe River is the change of the boundary conditions in the lower reaches of the Weihe River after the construction of the Sanmenxia Reservoir, including the siltation and elevation of the erosion datum of Tongguan, the lack of viscous components in the shoreline and the inner plain, and the poor scour resistance. At the same time, it is also affected by the change of the incoming water and sediment conditions in the lower reaches of the Weihe River and the flood with high sediment content.
【作者单位】： 长沙理工大学水利工程学院;水沙科学与水灾害防治湖南省重点实验室;黄河水利科学研究院;国际泥沙研究培训中心;
【基金】：国家自然科学基金项目(91547112,91647118) 国家国际科技合作专项(2014DFG72010) 湖南省教育厅资助科研项目(16B010) 黄河水利科学研究院院所长基金项目(HKY-JBYW-2016-03) 水沙科学与水灾害防治湖南省重点实验室基金项目(2016SS04)
【分类号】：TV147.1
本文编号：2524285
[Abstract]:The lower reaches of Weihe River is a typical curved channel. Natural bending has occurred frequently in the past 60 years, and its trigger causes, formation process and evolution law are lack of in-depth study. The bending in the lower reaches of the Weihe River is a critical sudden change under the action of flood scour in flood season after the lateral evolution of the river bay to a certain stage, which directly affects the plane shape of the river, the scouring and silting of the upper and lower reaches of the river bed and the flood control safety of the local reach. Based on prototype observation, water and sediment data (1960 / 2013) and remote sensing images (1990 / 2015), the water and sediment conditions, influencing factors, temporal and spatial evolution process and causes of bending events in the lower reaches of Weihe River are analyzed. The main reason for the 18 times of bending in the lower reaches of the Weihe River is the change of the boundary conditions in the lower reaches of the Weihe River after the construction of the Sanmenxia Reservoir, including the siltation and elevation of the erosion datum of Tongguan, the lack of viscous components in the shoreline and the inner plain, and the poor scour resistance. At the same time, it is also affected by the change of the incoming water and sediment conditions in the lower reaches of the Weihe River and the flood with high sediment content.
【作者单位】： 长沙理工大学水利工程学院;水沙科学与水灾害防治湖南省重点实验室;黄河水利科学研究院;国际泥沙研究培训中心;
【基金】：国家自然科学基金项目(91547112,91647118) 国家国际科技合作专项(2014DFG72010) 湖南省教育厅资助科研项目(16B010) 黄河水利科学研究院院所长基金项目(HKY-JBYW-2016-03) 水沙科学与水灾害防治湖南省重点实验室基金项目(2016SS04)
【分类号】：TV147.1
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