Demand Analysis of Water Resources Based on Pulse Process of Complex System

In this paper, we examine the demand for fresh water of China in 2025 from the complex system modeling perspective and we develop an efficient, economical and practical water strategy to meet the demand for fresh water in 2025.Different from previous research, this study focus on studying several factors that can influence the demand for fresh water, and their interplay within the complex large-scale system. We construct the Directed Graph Model and the Impulse Process Model to study the complex system in a qualitatively way. After that, on the basis of qualitative study, we study the whole system quantitatively by using the Leontief Inverse Matrix. And draw an effective, feasible, and cost-efficient water strategy, namely, adjusting the relation between seawater desalination and the water protection.