基于SWAT模型的西枝江流域洪水资源利用潜力研究

Assessment of Flood Resources Utilization Potential in the Xizhijiang River Basin Based on SWAT Model

科学评价洪水资源利用潜力是高效利用流域洪水资源与缓解水资源供需矛盾的前提。为评估西枝江流域不同河段洪水资源利用潜力,通过构建SWAT模型模拟西枝江流域多年天然径流过程,基于极限分析理论量化评价上、中、下游河段的洪水资源利用潜力,并结合水质条件探讨西枝江流域洪水资源利用的可行性。结果表明,SWAT模型在西枝江流域径流模拟方面具有较好的适用性;该流域洪水资源年际分布不均,洪水资源利用潜力年际差异较大;下游洪水资源利用条件优于上游,但下游河段的洪水资源利用率较低,下游多年平均现状和理论利用潜力分别为3.48×10^(8)、7.97×10^(8)m^(3);西枝江流域干流河段水质指标均不低于Ⅲ类标准,洪水资源利用具有可行性。研究结果可为西枝江流域洪水资源优化配置提供支撑,对实现流域高质量发展具有重要参考价值。

Scientific evaluation of flood resource utilization potential is an important prerequisite for carrying out flood resource utilization in the basin and alleviating the contradiction between supply and demand of water resources.To evaluate the potential of flood resource utilization in different sections of the Xizhijiang River Basin,the SWAT model was constructed to simulate the natural runoff process of Xizhijiang River Basin,and the flood resources of the basin were quantified by combining the limit analysis theory.The potential of flood resources utilization in the upper,middle and lower reaches of the basin was evaluated,and the feasibility of flood resources utilization in Xizhijiang River Basin was discussed based on the water quality conditions.The results show that the SWAT model has good applicability in runoff simulation of Xizhijiang River Basin;The inter-annual distribution of flood resources is uneven,and there are great differences in inter-annual flood resources utilization potentiality.The utilization condition of flood resources in the lower reaches is better than that in the upper reaches,while the utilization rate of flood resources in the lower reaches is lower.The average annual current and theoretical utilization potential of flood resources in the lower reaches are 3.48×10^(8)m^(3) and 7.97×10^(8)m^(3),respectively.The water quality indexes of the main stream of Xizhijiang River Basin are not lower than the classⅢstandard,and the utilization of flood resources in Xizhijiang River is feasible.This study can provide support for the optimal allocation of flood resources in Xizhijiang River Basin,and it has an important reference value for achievement of high quality development of the basin.