Study on optimal allocation of water resources in Yiluo River Basin with reclaimed water utilization

According to the guidance of the Ministry of Water Resources and the National Development and Reform Commission on strengthening the allocation and utilization of unconventional water sources, research and exploration have been carried out in the water-scarce Yiluo River Basin to optimize water resource allocation incorporating reclaimed water. The aim is to alleviate the conflict of water scarcity in the basin and improve water supply security. This paper constructs an Interval Two-Stage Fuzzy Robust Planning (ITFRP) model, using fuzzy uncertainty theory and interval two-stage robust optimization methods to effectively coordinate the uncertainties in the collaborative scheduling of reclaimed and natural water sources, as well as the uncertainties in economic costs. The results indicate that this model can effectively handle multiple uncertainties, optimize the combined allocation of reclaimed water and other water sources, reduce system water shortage losses, and improve water use efficiency. Therefore, increasing the reuse rate of reclaimed water in water-scarce basins has a significant positive effect on alleviating the supply-demand conflict in water-short regions and enhancing the overall economic benefits of the area. By adjusting the robustness coefficient, it is possible to balance system benefits with water shortage risks, enhance the reliability of allocation plans, and effectively ease the pressure on water supply in the basin.