国家重点研发计划课题( 2018YFC1508003) ; 南水北调中线一期工程安全风险评估项目 III 标段) 洪水风险评估( JZ0203A242016)
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Abstract:
To prevent the high-filled section of a large-scale artificial water conveyance channel from breaking under abnormal external forces, it is necessary to establish an appropriate scenario analysis method to simulate and evaluate the effectiveness of the combined applicat ion of multiple control measures in the emergency response under different breach scale. Using the flood simulation model independently developed by the China Institute of Water Resources and Hydro power Research, by improving the topological relationship of crossed channels and simulation method of recession sluices, a dike break flood in undation model of one-dimensional channel, breach flow , and two-dim ensional simultaneous coupling calculation on both banks was established. Taking a ty pical high-filled reaches of a lar ge-scale artificial water supply channel as an example, the changes in flood inundation characte ristics under 12 scenarios, including different breach width, gate closing time, and whether the retreat gate is opened or not, are classified and analyzed. The results show ed that: the increase of breach width had less impact on inundation extent and degree of outburst flood; the earlier the closure time of sluice gates was, the better the decr ease of inundation area and wate rdepth was, while the effect was more obvious during the first 3 hours after dike-breaking happened. When the terrain and ground objects distribution were conductive to flood diffusion, closing the sluice gate early could decrease more inundation area , otherwise, in areas where flood was not easy to spread, it was more effective for the decrease of inundation depth. The mitigation function of recession sluice for inundation was relevant to the relative position and distance between the gate and breach, the sluice located in the upper stream of the breach with closer distance was more effective to decrease the inundation. The basic method and basis are provided for the formulation or improvement of corresponding emergency plans of the large-scale artificial water supply channel.
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