| 引用本文: | 薛海,刘震,刘明潇, 等.基于安全行洪与滩区建设协调的冲积性河流洪水特性研究[J].灌溉排水学报,2022,41(3):136-144. |
| XUE Hai,LIU Zhen,LIU Mingxiao, et al.基于安全行洪与滩区建设协调的冲积性河流洪水特性研究[J].灌溉排水学报,2022,41(3):136-144. |
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| 摘要: |
| 【目的】利用广阔河漫滩进行适度开发建设，促进流域高质量发展；了解人类活动影响下的冲积性河流洪水特性，提出实现滩区工程建设与河流安全行洪协调一致的解决方案，将保护河流健康落实在河流工程建设中。【方法】选择某冲积性河流宽滩区拟开发生态观光旅游绿道，采用历史演变分析，河床冲淤预测及水动力数值模拟等综合研究方法，分析了工程河段洪水特性、河道演变规律及水库下游的河床调整因素，研究了预测河床边界的处理模式与河流工程等效阻力。通过平面二维洪水数值模拟计算，分析了绿道涉及河段的洪水特性及线路对行洪期流场的影响。【结果】模拟研究首先得到该河段主流自由摆动度受到整治工程限制，洪水河势保持基本不变；其次拟建绿道远离河槽、顺槽平行布线，滩区过流面积阻水比小于2.6%，道路建设引起的局部壅水不超过0.058 m。【结论】科学规划线路与工程布置，可以将工程对河流洪水传播的影响降至最低，满足河道行洪安全与滩区开发建设的协调关系。 |
| 关键词: 冲积性河流；滩区开发；水动力模拟；行洪安全；阻水比 |
| DOI：10.13522/j.cnki.ggps.2021325 |
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| Flooding Analysis for Alluvial River Based on the Balance between Flood Control and Floodplain Development |
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XUE Hai, LIU Zhen, LIU Mingxiao, et al
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North China University of Water Resources and Electric Power,
Port Channel and Ocean Development Research Center, Zhengzhou 450046, China
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| Abstract: |
| 【Background】Floodplain is the ecological cradle of alluvial rive to provide a buffer to flooding. Rivers naturally function to transport runoff and sediment, making the river have the double section characteristics of river trough and beach to meet the needs of water and sediment transportation in different periods. There are also villages in the floodplain of many rivers. There will inevitably be some contradictions between the needs of human activities (such as agricultural irrigation, transportation and social development) and river functions (ecology, flood and sediment transportation). If there is no scientific coordination between the two aspects, it will lead to mutual restriction affecting the ecological health of the river as well as the Sustainable high-quality development of the beach area society. It has become an important challenge for river managers to plan traffic routes in wide floodplain areas with less environmental impact. In order to implement the protection of river health in river project construction, the characteristics of alluvial river flood must be understood under the influence of human activity.【Objective】Taking advantage of the vast river floodplain to conduct the appropriate development and construction, it would be helpful to promote the high-quality development of the river basin. Learning more about the flood characteristics of alluvial rivers under the influence of human activities, and proposing a solution scheme to realize the coordination of floodplain engineering construction and river safety flood discharge, would contribute to practicing the protection of river health in constructing the river engineering.【Method】Taking a proposed eco-tourism greenway in the wide floodplain area of an alluvial river as an example, using the comprehensive research method involving historical evolution analysis, riverbed scouring-depositing prediction and hydrodynamic numerical simulation, the flood characteristics of the engineering reach, the law of river course evolution, the riverbed adjustment factors at the lower reaches of the reservoir were analyzed. The treatment model for predicting the riverbed boundary and the equivalent resistance of the river engineering were studied. By means of two-dimensional flood numerical simulation, the flood characteristics of the river section involved in the greenway and the influence of the route on the flow field during the flood discharge period were also analyzed.【Result】Firstly, the simulation shows the free swing of the mainstream is restricted by the regulation projects, and the river regime in flood period remains unchanged. Secondly, the proposed greenway is far away from the main channel and the routing is in parallel with the channel, which make the water blocking ratio of the flow area in the beach area less than 2.6%, and the local backwater caused by road construction limited to 0.058 m.【Conclusion】The arrangement of the proposed greenway is suggested to be routed along the river and located in high beach. Through scientific planning of routes and project layout, the impact of the project on the propagation of river floods can be minimized, and the coordinated relationship between the river flood discharge safety and the beach area development can be satisfied. |
| Key words: alluvial river; floodplain development; hydrodynamic simulation; flood discharging safety; water resistance ratio |
