干旱地区河槽暗蓄雨洪资源化利用模拟

Simulation of Stormwater Reclamation in Underground Water Storage Space of River Channel in Arid Area

目的 研究利用雨洪资源解决干旱地区用水短缺问题,提出利用河槽暗蓄收集雨洪最佳工程方案,为该类工程的设计提供参考。方法 应用Visual Modflow软件模拟研究辽西喀左地区内第二牤牛河流域中不同调蓄方案和拦蓄入渗方案对河槽暗蓄雨洪资源化的影响。结果 通过不同调蓄方案的对比,采用可调控悬挂截渗坝代替现有截渗坝时,雨洪资源利用率可提高至20.3%;通过不同拦蓄入渗方案的对比,“不清河床+坑塘+拦水堰”方案的雨洪资源入渗量为天然条件下雨洪资源入渗量100倍以上。结论 河槽暗蓄雨洪资源化工程最佳的拦蓄入渗和调蓄组合方案为在“不清河床+坑塘+拦水堰”的情况下采用可调控悬挂截渗坝,可显著提高雨洪资源利用率。

This paper was proposed to study the use of rainwater resources to solve the problem of water shortage in arid areas,and to propose the use of river channel concealed storage to collect rainwater,and to find out the working conditions,so as to provide a reference for the design of this kind of project.Visual Modflow software was applied to simulate and study the effects of different regulation schemes and detention and infiltration schemes on rainwater resources collection by river channel dark storage in the second downstream oxbows river basin within the Kazuo area of Liaoxi.The rainwater resource utilization rate can be increased to 20.3% when the existing check dam is replaced by an adjustable suspension check dam by comparing different storage schemes;the rainwater resource infiltration amount of the "unclean riverbed+pit pond+check weir" scheme is more than 100 times of that of the natural condition by comparing different storage and infiltration schemes.The infiltration volume of rainwater resources is more than 100 times that of rainwater resources under natural conditions.The best combination of storage and infiltration and storage in the river channel dark storage rainwater resource project is the use of adjustable suspension interception dams in the case of "unclear riverbed+pit ponds+interception weir",which can significantly improve the utilization rate of rainwater resources.