The Reaction of Groundwater Chemical Characteristics to the Eco-water Conveyance in the Lower Tarim River
塔里木河下游地下水化学特征对生态输水的响应

Based on the monitoring data collected from 40 monitoring wells at 9 sections in the lower reaches of the Tarim River, the regulation of groundwater chemical variations impacted by eco-water conveyance from May 2000 to November 2002 were studied. It indicates that the groundwater chemical characteristics have changed a lot, due to the impacts of five times intermittent water transport. At the beginning of the impact caused by water transferring, the concentration of main ions and total dissolved solid (TDS) in groundwater increased obviously; in the intermediate stage, the concentration decreased, the speed of the decrease is fast at first and then slow; and in the later stage, the major ions and TDS increased step by step. The movement mechanism of hydro-salinity is also analyzed in this article. Through the discussion of variation of groundwater chemical characteristics, it is found that the impact of eco-water conveyance on groundwater chemical characteristics is only to dilute the consistence, not reducing the amount of salinity. A series of engineering and managing measures should be taken to decrease groundwater salinity.