| Cite this article: | 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,0,():-. |
| XUE Hai,liuzhen,liumingxiao,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,0,():-. |
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| DOI： |
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| Research on the Flood Characteristics of Alluvial River Ensuring the balances between Flood Control and Beach Construction |
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XUE Hai, liuzhen, liumingxiao, xumengxin, sundongpo, zhuyongjie
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North China University of Water Resources and Electric Power
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| Abstract: |
| 【Background】The floodplain is the ecological cradle and the flood buffer zone of an alluvial river system. Nature gives rivers the function of transport runoff and sediment, making the river has the double section characteristics of river trough and beach to meet the needs of water and sediment transportation in different periods. There are also many villages in the vast floodplain area of some rivers. There will inevitably be some contradictions between the needs of human activities (such as agricultural irrigation, transportation and social development) and the river's own functions (ecology, flood and sediment transportation). If there is no scientific coordination between the two aspect, it will lead to mutual restriction, and affect 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, it 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 investigation objective, 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 researched. By means of the plane two-dimensional flood numerical simulation calculation, 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 research shows that the free swing of the mainstream of the river is restricted by the regulation projects, and the river regime in flood period is basically unchanged. Secondly, the proposed greenway is far away from the river channel and routing in parallel along the channel, which make sure that 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 in 5.8cm. 【Conclusion】The arrangement of the proposed greenway is suggested to be routed along the river, away from river channel 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 largely, and the coordinated relationship between the river flood discharge safety and the beach area development could also be satisfied. |
| Key words: alluvial river; floodplain development; hydrodynamic simulation; river regime; flood discharging safety; water resistance ratio |
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