蓄滞洪区转移道路工程规划布设研究

Study on Planning and Layout of Transfer Road Engineering in Flood Storage and Detention Areas

蓄滞洪区是防洪工程体系的重要组成部分,转移道路是蓄滞洪区分洪蓄水时防汛抢险、群众安全转移的重要通道。蓄滞洪洪区转移道路布设涉及转移人口数量、道路长度和转移时间等诸多问题,为了研究解决蓄滞洪区转移道路规划布设问题,在洪水风险图避洪转移分析计算模型原理基础上,引进道路干扰系数,研究建立转移道路规划布设模型。选取杜家台分蓄洪区内香城垸、曲口垸和新农垸等7个围垸共20个转移单元利用转移道路规划布设模型进行转移道路干线、支线布设和转移所需时间计算,计算得到在初步拟定转移道路布置和长度的基础上转移所需时间为0.74~5.15 h,小于可用转移时间;对确定转移线路的7个围垸进行转移道路路网密度计算,计算得到围垸路网密度为0.44~0.92km/km^(2),其数值能满足规范要求。结果表明该模型能较为方便的确定蓄滞洪区内转移道路干线、支线的布置及道路长度,并定量计算出转移单元安全转移至安置点所需转移时间,该模型可作为蓄滞洪区转移道路规划布设参考。

Flood storage and detention area is an important part of the flood control engineering system,and the transfer road is an important channel for flood control and emergency rescue,as well as for the safe transfer of people during flood diversion in flood storage and diversion area.The layout of transfer roads in flood storage and diversion area involves many issues such as the number of transferred population,road length and transfer time.To study and solve the problem of planning the layout of transfer roads in flood storage and diversion areas,this pa⁃per introduces road interference coefficients and establishes a planning and layout model for transfer roads based on the principle of flood risk map and flood avoidance transfer model.A total of 20 transfer units from 7 embankments,including Xiangcheng Embankment,Qukou Em⁃bankment,and Xinnong Embankment in the Dujiatai flood storage and diversion area,were selected to calculate the time required for the layout and transfer of trunk and branch roads by using the transfer road planning and layout model.Based on the preliminary plan of the trans⁃fer road layout and length,the time required for transfer is 0.74~5.15 hours,which is less than the available transfer time;The road network density of transfer roads is calculated for the seven embankments with determined transfer routes,and the calculated road network density of embankments is 0.44~0.92km/km2,which can meet the requirements of specifications.The results show that the model can conveniently de⁃termine the layout and length of the trunk lines and branch lines of transfer roads in flood storage and diversion areas,and quantitatively cal⁃culate the transfer time required for the safe transfer of transfer units to resettlement sites. The model can serve as a reference for the planningof transfer roads in flood storage and diversion areas.