Decision-making model of optimal layout based on detouring coefficient for connection bridge in open channel water diversion project
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Abstract:
The connection bridge spacing will influence the water conveyance capacity of the middle route of South-to-North Water Transfer. Therefore, reasonable layout of the cross ditch bridge for residents on both sides should not only ensure the channel capacity but also cater for the daily needs of the residents at both sides. On the basis of the layout rationality analysis for the middle route of the South-to-North Water Diversion project, this paper presented general principles of optimal layout about connection bridge on long distance open channel. And then, taking into account the influence of different characteristics of bridge spacing on channel capacity, the maximum distance of the cross ditch bridge was obtained combining with the longest tolerable detouring distance for residents, the connection bridge layout alternatives were drawn up, the layout decision model for selecting the site of connection bridges was established based on the principle of minimum synthetic detouring coefficient, and eventually the final specific location was determined. In the end, the method was applied to the case of the middle route of South-to-North Water Transfer (from Beijing to Shijiazhuang), which was proved satisfying. Decision-making model of layout scheme, based on the principle of minimum synthetic detouring coefficient, has suitable and extensive application in site optimization of the connection bridge on long distance water transfer channel.
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