Water resources allocation model based on ecological priority in the arid region.

Based on the characteristics of arid regions in the central and southern Ningxia，firstly we constructed the theoretical framework about rational allocation of water resources based on ecological priority, which supplemented and improved the theoretical system on rational allocation of water resources for sustainable development. On the basis of theoretical research, depending on its characteristic of water resources：pumping water from Yellow River in the north, piloting water from Jing River in the south and regional water resources, which formed a mixing water supply pattern of "pumping, piloting, storage". The theory of water resource allocation system was perfected. Then the mathematical model for the rational allocation of water resources was established on the basis of biggest benefit combined with economy, society and ecology. The model coincided the ecological water and domestic water benefit into the overall benefits, and provides them larger benefit coefficient and the priority order coefficient to realize the reasonable allocation of water resources on ecological priority mode. Finally, the results of allocation are analysed in detail, which provides constructive suggestions and guiding direction for the study of the rational allocation of regional water resources.