Research On The Combined Water Resistance Effect Of Highway(Railway) Based On The One And Two-dimensional Coupled Hydrodynamic Model

As an indispensable component of the flood control system, the Dahuangpuwa flood detention area plays an important role in peak clipping and flood reducing. In addition to flood control, however, the flood detention area also has the problem of national economic construction.How to make economic development adapt to flood control is worth exploring. The ample layout of the road network is an important index of economic development, and the layout of highways and railways will have different influence on flood routing. Therefore, the scientific planning of the highway and railway is an entry point to study how to balance the flood control function of flood detention area and its economic development. Take the Dahuangpuwa flood detention area as an example, a set of one and two-dimensional coupled hydrodynamic models for different frequency floods and different highway (railway) layout form is established, to calculates flood hydraulic elements. Analysis and Study on water resistance effect of highway, railway and other linear features. This effect is expressed by both submerged area and economic loss. It is proved that the model is feasible, and 50-year return period flood is most suitable for analyzing the water resistance effect of highway(railway). Under the status quo condition, in order to eliminate the interference of strong water blocking characteristics of the partition, comparative analysis of no road and partition and all roads and partitions condition. For the planning highway(railway),consider the most adverse effects, the layout is set at 90° to the angle of flood routing.comparative analysis of no road and partition and all roads and partitions condition.By adjusting the size of the culvert to change the water resistance of the road. The main conclusions include:Under the status quo condition, for no road and partition condition, inundated area is maximal, which is 134.09km2,flood develops beyond the Binbao Expressway. As the roads are gradually laid upstream, the flood stops its evolution due to its water resistance effect, and the economic loss subsequently decreased, by up to 184.8 million yuan, about 10.71%. From all roads and partitions to no road and partition condition, inundated area increased by 58.52%. The concentration water depth of inundated area was reduced from 0.5?1m to 0.05?0.5m. Compared with non-partitioned and partitioned, the economic loss increased by a maximum of 513.49 million yuan, about 33.32%.Under the planning condition, for all roads and partitions condition, as the culvert size is 3m,the inundated area and economic loss both are minimal. As the culvert size is 4m, zone ? is enabled with the flood developing. So the inundated area and economic loss both are maximal,the increase was 29.76% and 19.26%. When the culvert size is 1?3m,only zone I is used,so the inundated area changed little, at the same time, due to the different trend of each component,there is no obvious regularity of total economic losses. For no road and partition condition, only one planning road was considered, so the human activity is less affected. The inundated area varies from 131.04?135.68km2.The economic losses change is also small, maintained at about 174 million yuan.So the construction of the road in the corresponding location of Dahuangpuwa flood detention area should be according to the possible flood losses, select the 3m-wide culvert construction program, at this time, the flood losses are minimal.Through the above analysis and demonstration, in combination with one-two dimensional coupled hydraulic model, it is feasible to analyze the water resistance effect of the existing roads from inundated area and economic loss aspects. And it is meaningful to propose the planning road construction from the point of view of water resistance of the road.