STUDY ON THE GROUNDWATER RENEWABILITY IN THE SOUTH EDGE OF JUNGGAR BASIN

The Junggar basin is one of the four inland basins in China. The north piedmont plain of the Tianshan Mountains, which laid on the south edge of the Junggar basin, is one of the three development regions in Northwest of China and the center of social, economic and culture in Xinjiang automation region. it become a typical district in researching the groundwater environment evolution and its renewability of arid areas, because it has a obvious geomorphic zones, complicated geological construction, typical characteristic of three types of water transformation, high frequency in human activities and serious eco-geological environmental problems in the arid inland region.

This paper mainly aimed to initial discussion on basic theories and method on groundwater renewability. Firstly, put forward to a concept on groundwater renewability, that is, it is a property of being able to utilization many times by natural cycle and manual regulation and then it reflects the total capability about groundwater recharge, regulation and storage, renewability and recovery. Secondly, establish assessment index systems of groundwater renewability, including natural recharge ratio, return recharge ratio, regulation and storage coefficient, balance ratio between recharge and exploration, groundwater residence time, transmissivity. Thirdly, built 45 assessment units according to groundwater flow system, then by Analytic Hierarchy Process (AHP) weight method to decide natural recharge ratio, groundwater residence time and balance ratio between recharge and exploration is the mainly indexes. Finally, by means of the comprehensive index model and comprehensive fuzzy model to assess groundwater renewability. As we can know, two models have the similar assessment result, according to regional hydro-geological condition and isotope research, the author thinks the result of comprehensive fuzzy model is much more practical to research zone.