塔里木河干流下游生态输水后水量转化特征

以塔里木河干流下游6次生态输水期间的河道监测资料为依据,对各河段的河道渗漏特征进行分析,得出了河道的耗水量既与水文地质条件有关,同时又与输水的时间相关.在此基础上,利用Processing Modflow软件对长期输水条件下河水转化为地下水的趋势进行了模拟,表明在间歇输水的条件下,河水转化为地下水的效率是逐渐降低,同时地下水的蒸腾量则逐渐上升,二者最终将趋于平衡,此时的地下水也将达到动态稳定的水位.

Study on the Characteristics of Water Conversion after Conveying Stream Water to the Lower Reaches of the Tarim River for Regenerating the Ecology

Located in the north Tarim Basin,the Tarim River is the longest continental river in China.However,stream flow at the lower reaches(357 km in length) of the river had been cut off since 1972.In this paper,the characteristics of leakage during stream water conveyance are analyzed based on the monitoring data collected during 6 times of conveying stream water to the lower reaches of the Tarim River for regenerating the ecology.The results show that the stream water leakage is related to the hydrological and geological conditions and the time of stream water conveyance.Moreover,the conversion trend of stream water to groundwater under the long-term stream water conveyance is simulated using Processing Modflow.The results reveal that the conversion efficiency of stream water to groundwater is gradually reduced under such intermittent stream water conveyance,but the evapotranspiration of groundwater is gradually increased,and a dynamical stability of groundwater level will be attained.Temporally,the groundwater level is continuously increased with the time of stream water conveyance.Viewing from the spatial distribution of groundwater level,the dynamical stability of groundwater level is advantageous for regenerating the vegetation along both riversides of the lower reaches of the Tarim River.