Study On Water Cycle Regularity Based On Environmental Isotope In Jinxiuchuan Basin

With the development of modernization, the demands for water resources become more urgent, meanwhile more concerns are attracted to the problems of the use of water resources. The study selected Jinxiuchuan Basin which can represent the characteristic of warm temperate semi-arid and semi-humid monsoon climate zone to research the water circulation patterns. According to the simples of precipitation, soil water, groundwater and river water during July2011to July2012, the isotopes are used to sign the different water bodies. And then we test and analysis the hydrogen and oxygen stable isotope to explore the transformation relation and conversion rate of between precipitation, river water, soil water and ground water, which is in order to afford the basic data for establishing eco-hydrological model and provide technical support for sustainable water management in the research area.(1) Atmospheric precipitation is an important link in the water cycle. By researching the characteristics of environmental hydrogen and oxygen isotope of precipitation in Jinxiuchuan Basin, the correlations of isotope values with time, temperature and precipitation are determined. There is a global regularity of isotopic values changing with seasons for that the isotopic value is high in summer, while low in winter, and is positively correlated with temperature, while negatively correlated with precipitation. In order to determine the control mechanism by different precipitation air mass of Jinxiuchuan Basin in seasonal scale, we mark the precipitation cloud using isotope. It is advantageous to study the space-time change low of precipitation by hydrogen and oxygen stable isotope, and the results can be used to compare with the traditional research method.(2) By studying the relationship between the hydrogen and oxygen stable isotopes in atmospheric precipitation in Jinxiuchuan Basin, the atmospheric precipitation equation in this basin is determined as δD=7.16δ180+4.35‰, R2=0.92. It is particularly important for the change rules of atmospheric precipitation during water cycle in Jinan southern mountain, as well as in inland areas with the zone of the continental monsoon climate.(3) After the study of deuterium excess (d) distribution in Jinxiuchuan Basin in different water bodies, we find the change rules of d value of rainfall is small in summer, and the d value is10%o lower than the intercept of the atmospheric precipitation equation. While it is large in winter, and the d value is higher than the intercept. The main reason is that the precipitation of summer and winter is influenced by different air masses. It is mainly controlled by the warm air from the sea in summer, and the d value decreases gradually. However, it is affected by the continental air mass from polar in winter, and the d value increases gradually. The d values of river water, soil water and spring water change a little with little overall change, and they are similar at different seasons, which indicate that the differences of supply sources of river water, soil water, groundwater recharge source are small. Through the analysis of the reason of different water deuterium surplus values, we can determine the water supply sources of different waters in Jinxiuchuan Basin, which has important significance for the exploration of water cycle.(4) Using the isotope labeling technique and the isotope ratio formula, the ratios of the atmospheric precipitation translating into the river water, soil water and groundwater in Jinxiuchuan Basin are determined, which were71.25%,21.91%and6.84%, respectively. The rest of the atmospheric precipitation is wasted due to evaporation and vegetation interception. Besides, the transformation between different waters in Jinxiuchuan Basin is discussed. The ratio of groundwater translating into river water is28.75%, and the ratio of river water translating into the atmosphere water is29%. At the same time, the transformation in water cycle process is validated by industrial salt tracer technique. The results show that it is objective and effective to study the water cycle process using the isotope labeling techniques. Besides, stable hydrogen and oxygen isotope technology provides technical supports for establishing eco-hydrological model and sustainable management of water resources.