Impact of an artificial chute cutoff on the river morphology and flow structure in Sipaikou area of the Upper Yellow River
Impact of an artificial chute cutoff on the river morphology and flow structure in Sipaikou area of the Upper Yellow River
复制标题
人工溜槽截流对黄河上游四牌口地区河流形态及水流结构的影响
DOI：
10.1007/s11629-021-6664-z
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发表时间：
2021-11
影响因子：
2.5
通讯作者：
Yang Cheng
中科院分区：
文献类型：
--
作者：
Qiao Qiao;Li Chunguang;Jing Hefang;Huang Lingxiao;Yang Cheng
人工切槽可以从根本上消除弯曲河道造成的洪水威胁，但也显著改变了弯曲河道的形态动力学特性，切槽后河道调整迅速，仅通过现场实测难以研究河道形态与水流结构的相互作用，而数值模拟可以为人工切槽后的水动力学特性提供深入的认识。采用实测和数值模拟相结合的方法，对2018年黄河上游四排口地区人工切槽引起的水流结构和河床形态进行了研究，实测水文资料为数值模型提供了边界条件和初始值，实测结果表明，研究区凹岸冲刷严重至人工截断后270 m，计算结果表明，在典型断面上的流速数值模拟结果与实测结果吻合较好，在低流量工况下，右岸附近出现了明显的水流分离区和滞流区（流量至少为902 m3/s），但在较大流量条件下，这种现象并不存在（流量超过2000 m3/s），在冲坑左右岸附近还发现了水流回流区，并在冲坑和水池处形成了较长的通量带，从而导致了冲刷坑的形成。小流量时，河床地形对水动力特性的影响较为突出，而大流量时，对河岸和河床的影响更为显著;此外，研究区下游左岸附近存在较高的剪切应力，这表明下游左岸仍在冲刷，这些结果表明，左岸需要采取沿着护岸措施，以保持人工陡槽截水的有效性。
Artificial chute cutoff can fundamentally eliminate the threat of flood caused by the meandering river,but it significantly changes its morphodynamic characteristics.Channel adjustments after cutoff are rapid,which makes it difficult to study the interaction between river morphology and flow structure only through field measurement.However,numerical simulations can provide insights into the hydrodynamic characteristics after artificial chute cutoffs.In this study,both field measurement and numerical simulation are employed to investigate the flow structure and bed morphology caused by an artificial chute cutoff in Sipaikou area of the Upper Yellow River in 2018.The measured hydrological data provide boundary conditions and initial values for the numerical model.The field measurement results reveal that the concave bank of the study area is severely scoured up to 270 m after the artificial cutoff,and a 20 m deep scour hole and a 2.26 km long pool are formed at the entrance and near the left bank of the chute channel.The numerical simulation results of velocity at typical cross-sections are in good agreement with the measurement results.Flow separation and stagnation zones are observed near the right bank during the low flow conditions(discharge of at least 902 m~3/s),but this phenomenon is not seen during larger flow conditions(discharge exceeds 2000 m~3/s).Interestingly,flow recirculation zones are also found near the left and right banks of the scour hole.Further,a long flux belt is formed at the scour hole and the pool.Consequently,the impact of the bed topography on the hydrodynamic characteristics is relatively prominent when the discharge is small,while the impact on the river banks and river bed is more noticeable when the water discharge is large.In addition,high shear stress is observed near the left bank at the downstream of the studied area,which indicates that the left bank at the downstream is still being scoured.These results suggest that bank protection measures along the left bank are required to maintain the effectiveness of the artificial chute cutoff.
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影响因子：
5.4
作者：
HOWARD, AD;KNUTSON, TR
通讯作者：
KNUTSON, TR
影响因子：
3.9
作者：
Zhiwei Li;Guoan Yu;G. Brierley;Zhaoyin Wang;Y. Jia
通讯作者：
Zhiwei Li;Guoan Yu;G. Brierley;Zhaoyin Wang;Y. Jia
影响因子：
7.4
作者：
L. Smith;B. Winkley
通讯作者：
L. Smith;B. Winkley
影响因子：
--
作者：
W. M. Dijk;W. V. D. Lageweg;M. Kleinhans
通讯作者：
W. M. Dijk;W. V. D. Lageweg;M. Kleinhans
影响因子：
3.9
作者：
Zhiwei Li;Xinyu Wu;P. Gao
通讯作者：
Zhiwei Li;Xinyu Wu;P. Gao