荆江石首河段近50年河床演变分析
发布时间：2018-07-31 15:23
【摘要】：河道裁弯及三峡工程运用对荆江石首河段的河床演变产生了显著影响。结合实测水沙及地形资料分析,研究了该河段近50年来的河床演变特点,主要包括河床冲淤、平面及断面形态调整三个方面。分析结果表明:两次裁弯使得石首河段平面形态发生显著调整,1966-1975年该河段深泓平均摆幅达42.0m/a,且总体向左岸摆动。三峡工程运用后,大规模护岸工程的实施使石首河段的平面形态趋于稳定,深泓平均摆幅减小到29.8m/a,但北门口下段、调弦口弯道等位置的深泓摆动仍较为剧烈,使得这些局部河段岸线崩退现象十分明显。此外还分析了石首河段断面形态的调整过程,并建立了河段平滩河槽形态参数与前5年汛期平均水流冲刷强度的经验关系式,用于反映河段平滩河槽形态随水沙条件的变化趋势。
[Abstract]:The river bed evolution in the Shishou reach of Jingjiang River has been significantly affected by the river channel bend and the application of the three Gorges Project. Based on the analysis of measured water and sediment and topographic data, the characteristics of river bed evolution in the last 50 years are studied, including three aspects of river bed erosion and siltation, plane and section shape adjustment. The results show that the plane shape of the reach of Shishou River is significantly adjusted by two cutting bends, and the average amplitude of the deep reach reaches 42.0 m / a during 1966-1975, and the total swinging to the left bank. After the operation of the three Gorges Project, the implementation of the large-scale bank revetment project has stabilized the plane shape of the Shishou reach, and the average swing amplitude of the deep Wang has been reduced to 29.8 m / a, but the deep wobble of the lower section of the North Gate mouth and the bend of the chord adjusting mouth is still quite intense. It is very obvious that the shoreline collapse and retreat in these parts of the river. In addition, the adjustment process of section shape in Shishou reach is analyzed, and the empirical relationship between the shape parameters of flat beach channel and the average water flow scour intensity in the previous 5 years is established. It is used to reflect the changing trend of the flat channel shape with the water and sediment conditions in the reach.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51579186,51339001) 国家重点研发计划课题(2016YFC0402303/05)
【分类号】：TV147
[Abstract]:The river bed evolution in the Shishou reach of Jingjiang River has been significantly affected by the river channel bend and the application of the three Gorges Project. Based on the analysis of measured water and sediment and topographic data, the characteristics of river bed evolution in the last 50 years are studied, including three aspects of river bed erosion and siltation, plane and section shape adjustment. The results show that the plane shape of the reach of Shishou River is significantly adjusted by two cutting bends, and the average amplitude of the deep reach reaches 42.0 m / a during 1966-1975, and the total swinging to the left bank. After the operation of the three Gorges Project, the implementation of the large-scale bank revetment project has stabilized the plane shape of the Shishou reach, and the average swing amplitude of the deep Wang has been reduced to 29.8 m / a, but the deep wobble of the lower section of the North Gate mouth and the bend of the chord adjusting mouth is still quite intense. It is very obvious that the shoreline collapse and retreat in these parts of the river. In addition, the adjustment process of section shape in Shishou reach is analyzed, and the empirical relationship between the shape parameters of flat beach channel and the average water flow scour intensity in the previous 5 years is established. It is used to reflect the changing trend of the flat channel shape with the water and sediment conditions in the reach.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51579186,51339001) 国家重点研发计划课题(2016YFC0402303/05)
【分类号】：TV147
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