Water Chemistry And Stable Isotope Characteristics Analysis Of Different Water Bodies In The Hutubi River Basin

Xinjiang secluded in the hinterland of the Eurasian continent, vast, complex and changeable climate, Rivers are from the mountains, geological structure and geographical environment difference, the lack of rainfall is a typical inland arid area in China. The Hutubi River Basin of Xinjiang is the second largest river in the northern slope of Tianshan Mountains, with complete mountain oasis desert system, the special geomorphic features and geographical environment of Hutubi River Basin, forming a inland arid region specific water circulation patterns.This paper mainly through carries on the analysis to the changes in the concentration of major ions in Hutubi River Basin in different water bodies of hydrogen and oxygen isotope characteristics and water, and in the time and space change characteristics of the variation characteristics of hydrogen and oxygen isotopes in water and major ions were studied to fine description of water resources, water resources in the Inland River Basin in arid region formation and transformation mechanism provides an important foundation and scientific basis. The main results are as follows:(1) Based on all kinds of water samples water chemical analysis data analysis shows all kinds of water body in the PH value : river water > snow melt water > irrigation wells > reservoir water > spring, river water and underground water in ion concentration showed Na+> SO42-> HCO3- > Ca2+> Cl-> Mg2+> K+. The water chemistry types of river water and groundwater are mainly Na+-SO42--HCO3-. With time variation, the river water and spring water from August to November during the major ions mainly showed less trend, and the trend of reservoir water and other two kinds of water bodies in contrast to the increase of the trend.(2) The main ion in the river water on the whole from west to east gradually decreasing trend. In the north and South trend, the anion of Cl- and SO42- and the cation of Ca2+ and Na+ are showed an increasing trend from the north to the south; while K+ and Mg2+ showed a convex type first increased and then decreased in theNorth-South direction; the anion of HCO3- from the north to the south showed a linear growth trend in the north-south direction. The spherical model are fit for the river in Cl-, K+, SO42-, HCO3-, The Gauss model are fit for the river in Ca2+, Mg2+, Na+, and the fitting accuracy index model to p H is the best to simulate the chemical components. According to the ordinary Kriging interpolation, the major ion in the river overall showed a gradually decreasing trend from south to north, and the ion content of Juntang Lake River is higher than the ion content of Hutubi river.(3) The Gibbs and Piper diagram analysis showed that the mainland of the basin and the table water and groundwater of major ions in the influencing factors of rock weathering and evaporation type, rock weathering mainly, and the basin within the local source material of various ions in the water contribution rate of the; Ca2 + was due to the basin carbonate and evaporite weathering, Na+ from the general to the area of metamorphic rocks and fire into rock, SO42- may sulfate transport to containing water and sulfate minerals weathering. The molar ratio of Na+, SO42- and the conservative ion Cl- showed that the region’s human activities have a certain effect on the water body.(4) The precipitation isotope has obvious seasonal variations, the annual distribution in 5-9 months showed precipitation isotope enrichment, 10-4 month period showed impoverishment phenomenon, there is a positive correlation between precipitation, temperature and precipitation isotope values; the hydrogen and oxygen isotopes in river water also showed a seasonal variation in the space. The distribution of oxygen and hydrogen isotopes in Hutubi River along with the increase of height decreases, and the hydrogen and oxygen isotope values in the Santanghu River along with the increase of altitude increase slightly, and the hydrogen and oxygen isotope of reservoir water was significantly higher; hydrogen and oxygen isotopes of groundwater in Hutubi River Watershed value obvious seasonal variation; snow melt water isotopes in the snow water in a day the value changed over time, was mainly affected by the temperature effect.(5) Precipitation of deuterium excess values overall changes significantly, the precipitation of deuterium excess values exhibited obvious seasonal differences, 6-8 months of deuterium excess values but for annual minimum value; water deuterium surplus and precipitation of deuterium surplus trend is basically the same, but the change is not greatly as precipitation of deuterium earnings change so obvious; groundwater in deuterium surplus overall changes in a small range, and there is no showed obvious seasonal variation.(6) The water line at the top of the local meteoric water line, the river line slope and intercept and the local atmospheric drop waterline of the slope and the intercept of the relatively close, indicating the precipitation on the river water replenishment effect. The variation range of the isotopic value of the groundwater is within the range of the isotopic value of the river, and is located near the local meteoric water line, reveals the river water and precipitation water are groundwater recharge. Melting snow waterline slope closer to the underground water, which also reflects the role of groundwater recharge snowmelt in a certain extent. According to the formula of isotope mixing ratio, the contribution rate of precipitation to surface water during the period of August and 2014 was 52.8%.