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首页> 外文期刊>Arabian journal of geosciences >Adjustments in reach-scale bankfull geometry of a braided reach undergoing contrasting channel evolution processes
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Adjustments in reach-scale bankfull geometry of a braided reach undergoing contrasting channel evolution processes

机译：Reach-Scale Bankfull的调整，编织达到对比频道演化过程的编织范围

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摘要

A braided reach of the Lower Yellow River (LYR) underwent contrasting processes of channel aggradation (from 1986 to 1999) and channel degradation (from 1999 to 2012) due to altered water and sediment regimes. Therefore, remarkable adjustments in bankfull channel geometry occurred in the braided reach over the past 27 years. In this study, the reach-scale bankfull channel dimensions in the braided reach were calculated during the period 1986-2012 using a reach-averaged method, based on the surveyed post-flood profiles at 28 cross sections. Calculation results indicate that the reach-scale bankfull area decreased gradually from 3525 m(2) in 1986 to 1482 m(2) in 1999 during the channel aggradation stage and increased quickly to 4499 m(2) in 2012 during the channel degradation stage, and the main-channel geometry in the braided reach generally tended to become narrower and deeper over the study period. It is also found that the variation in the reach-scale bankfull channel dimensions of the braided reach was closely related to the previous 5-year average discharges and incoming sediment coefficients during both flood and non-flood seasons, with the corresponding empirical functions being developed for these relations. The proposed relations can well reproduce the temporal changes in bankfull channel geometry of the braided reach undergoing contrasting channel evolution processes in response to the altered flow and sediment regime.
机译：由于水和沉积物制度改变，较低的黄河（Lyr）的编织范围接受了渠道委员会的对比过程（从1986年到1999年）和渠道退化（从1999年到2012年）。因此，在过去的27年中，在编织达到达到的银行频道几何体上发生了显着的调整。在该研究中，在1986 - 2012年期间使用REACH平均方法计算编织达到的到达尺度银行通道尺寸，基于28个横截面的受测量的洪水分布。计算结果表明，1999年，1999年的3525米（2）至1482米（2）逐步下降至1999年的渠道加法阶段，2012年在渠道退化阶段迅速增加至4499米（2），编织范围内的主沟几何形状一般往往会在研究期间变窄和更深。还发现，编织范围的到达范围基础的频率的变化与洪水和非洪水季节期间的前5年平均排放和入口沉积物系数密切相关，相应的经验函数正在开发对于这些关系。拟议的关系可以很好地恢复编织物的银行频道几何形状的时间变化，以响应于改变的流动和沉积物制度进行对比沟道演化过程。

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