WFE nexus in arid sandy grassland based on simulation optimization model
LYU Jingyu1, XU Chao1, LIU Yujun1, LI Bin2, JIANG Yanan1,3*
1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China; 2. Institute of resources, environment and sustainable development, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, Inner Mongolia 010031, China; 3. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract：Quantitative analysis of water-food-energy nexus of an arid sandy grassland, can provide scientific support for ecosystems that improve the grassland. The Python language-based MODFLOW model—FloPy was used, constructing the multi-objective simulation optimization model of the WFE system, considering the alfalfa production and irrigation energy consumption of research area, the NSGA-Ⅱ algorithm of the framework of multi-objective optimization tool Pymoo was used to solve the problem. The results show that the optimization model can quantify the WFE nexus of the semi-arid sandy grassland, and the NSGA-II algorithm provided by Pymoo has outstanding search efficiency and stability in the multi-objective optimization of WFE nexus; According to the comparative analysis of the six schemes set by the weight wx, the maximum difference of groundwater level in general year(scheme 1 to scheme 3)and drought year(scheme 4 to scheme 6)is 1.15, 1.43, 1.34, 0.96, 1.26 and 1.15 m, respectively; In general year and drought year, irrigation water can be reduced by 136.90% and 134.37%, crop yield can be increased by 18.60% and 18.31%, and energy can be saved by 26.94% and 27.89%.
