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为实现泾惠渠灌区地下水多年动态平衡,确定适宜的灌溉渠井用水比例,运用GMS中MODFLOW模块建立了月尺度的地下水数值模型;结合灌区地下水位年内变化特征、各灌季农灌用水情况和“丰蓄枯补,渠井结合”的原则,对3种代表年分别设置3种灌季渠井用水方案,并进行模拟比较。结果表明,平水年冬、春、夏灌季和全年渠井用水比例分别为2.1、1.8、0.7、1.36时,能使地下水位大致稳定且实际中较为可行;丰水年冬、春、夏灌季和全年渠井用水比例分别为2.3、2.0、1.1、1.64时,地下水能得到补充;枯水年冬、春、夏灌季和全年渠井用水比例分别为1.8、1.9、0.6、1.14时,地下水位下降较少。灌区的夏灌渠井用水比例对全年渠井用水比例影响最大,应尽可能提高夏灌渠井用水比例,实现地下水位的稳定或小幅上升。研究结果为灌区水资源的高效利用及水位恢复提供了参考依据。
In order to realize the dynamic balance of groundwater in Jinghuiqu Irrigation Area for a long time and determine the suitable proportion of irrigation canal water, the monthly groundwater numerical model was established by MODFLOW module in GMS. According to the characteristics of groundwater table in irrigation season, According to the principle of “accumulating dry branches, combining drainage with drainage channels”, three kinds of irrigation schemes for irrigation canal were set up respectively for the three kinds of representative years and simulated. The results showed that the water table in winter, spring and summer in the irrigation season and the whole year was 2.1, 1.8, 0.7 and 1.36, respectively, which made the water table stable and practically feasible. In winter, spring and summer Groundwater can be replenished when the proportion of irrigation water in the irrigation season and that of the whole year is 2.3, 2.0, 1.1 and 1.64, respectively; the proportion of drainage in the winter, spring and summer irrigation season and the whole year is 1.8, 1.9, 0.6, At 1.14, the water table dropped less. The proportion of summer irrigation canal water in irrigated area has the greatest impact on the proportion of well water in the whole year. As far as possible, the proportion of water in summer irrigation well should be increased to achieve stable or slight increase of groundwater level. The results provide a reference for the efficient utilization of water resources and the restoration of water level in irrigation areas.