基于多目标函数的避洪转移安置方案优化

Optimization of flood avoidance relocation scheme based on multi-objective function

针对目前避洪转移方案仅考虑时间或距离成本最优导致部分安置点人数分配不合理的问题,从“安全第一、就近就便、平灾结合、利于管理”的避洪转移安置方案基本要求出发,首先对安置点的适用性、分布合理性及容量大小3个方面进行分析,依据“时间、距离、适宜度和安置容量”四因素初步筛选合适的安置点。然后通过路权函数建立避洪转移时间成本矩阵,以转移时间成本和安置点的优化分配为多目标函数确定避洪转移安置点的最优分配方案。最后以TOPSIS评价方法对避洪转移安置点分配的单目标方案与多目标方案进行对比分析。结果表明:多目标方案的相对接近度大于单目标方案,基于多目标函数确定的避洪转移安置分配方案更加合理。

In response to the problem of the unreasonable distribution of some relocation points caused by the current flood avoidance and migration plan only considering the optimal time or distance cost,we conducted research based on the basic requirements of the flood avoidance and migration placement plan,namely“safety first,convenience and near distance,combined-function for normal time and emergency,and easy management”.Firstly,the suitability,distribution rationality and capacity of the placement points were analyzed.The suitable placement points were preliminarily screened based on the four factors of time,distance,suitability,and placement capacity.Then the time cost matrix for flood avoidance and migration was established through the route power function,and the optimal allocation scheme for flood avoidance and migration placement points was determined by optimizing the transfer time cost and placement point as a multi-objective function.Finally,a TOPSIS evaluation method was used to compare and analyze the single-objective solution and the multi-objective solution for the allocation of flood avoidance and migration placement points.The results showed that the relative closeness of the multi-objective solution was greater than that of the single-objective solution,and the flood avoidance and migration placement allocation scheme determined based on the multi-objective function was more reasonable.