关键词: 系统动力学, 系统动力学

Abstract: In order to realize the characteristics of cloud water resources, develop efficiently it and serve the industrial and agricultural production, the author used 56 years surface vapor pressure data and raining data of 11 stations in Tangshan and the GPS data, the spatial and temporal distribution of precipitable water and precipitation efficiency were analyzed. The results showed that: water resource in the air was abundant and the exploitation potential was great. Annual precipitable water in Tangshan was 6914.2 mm, the natural precipitation efficiency was 8.9%; the precipitable water of Tangshan increased gradually from north to south, the distribution of precipitation and precipitation efficiency was opposite with the precipitable water; the interdecadal variation of them was not obvious, annual precipitable water increased slightly, but the natural precipitation efficiency declined slightly; the distribution characteristics in month and season of them was similar; the monthly distribution of them was unimodal; they are maximum in July, but they were minimum in January; the precipitable water and the natural precipitation efficiency were maximum in summer, they were lower in spring and autumn, they were minimum in winter.