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本文以对小滩坡蓄滞洪区新建铁路后所作的防洪评价计算为实例,介绍了蓄滞洪区启用时,新建铁路上下游两个蓄水单元间的水体交换即流量过程的计算分析方法。整个蓄滞洪区以新建铁路为界分为上、下游两个蓄水单元,铁路桥涵过流能力按宽顶堰计算,根据上下游蓄滞洪区水位~面积~库容关系,采用试算法计算蓄滞洪区洪水流量过程。计算得到了蓄滞洪区两种工况下的洪水流量过程,结果显示新建铁路对小滩坡蓄滞洪区的防洪能力影响甚微,蓄滞洪区能够最大限度地发挥蓄滞洪水的能力。本文对于小滩坡蓄滞洪区内修建铁路后的洪水演进过程的计算,方法简单实用,对于相似蓄滞洪区的防洪评价计算有一定参考价值。
In this paper, the flood control evaluation of the newly constructed railway in Xiaodanpo flood storage and detention basin is taken as an example to illustrate the calculation and analysis method of water exchange, ie flow process, between the two water storage units in the upstream and downstream of the newly constructed railway when the flood storage and detention area is activated. The entire flood detention basin is divided into two upper and lower water storage units by the new railway. The overcapacity of the railway bridges and culverts is calculated according to the wide weir. According to the relationship between water level ~ area ~ storage in the upper and lower reaches of the flood detention basin, District flood flow process. The flood discharge process in two conditions of flood detention basin was calculated. The results show that the new railway has little effect on the flood control ability of flood detention basin in floodplain, and the flood detention basin can maximize the capacity of flood storage. In this paper, the calculation of flood evolution process after the construction of railway in the floodplain of Xiaotanpo is simple and practical, which has certain reference value for flood control evaluation and calculation of similar flood storage and detention areas.