【摘要】 针对河北省石津灌区地下水位不断下降的现状,根据灌区的水文地质条件,运用地下水数值模拟软件MODFLOW建立了地下水三维非稳定流模型,并利用地下水位实测资料进行率定验证。模型验证结果表明:模型能较好的反应该研究区域的实际情况,可用于该区域的地下水位预测。本研究利用该模型对井灌和井渠联合灌区地下水位进行模拟预测,并考虑井灌次数、井灌定额、渠灌定额等3种因素,提出了5种解决方案。结果表明:方案2(对灌区采用井渠联合灌溉方式,调整灌水时间:3月份采用井灌模式,单井平均抽水量为45m3/h,5月份和10月份采用渠道灌溉模式,平均灌水定额为1 800m3/hm2)是比较合理的方案,它能有效控制灌区地下水位,促进灌区的可持续发展,简单实用。更多还原

【Abstract】 The groundwater level has been descending continuously in Shijin irrigation district of Hebei province.The hydrogeological conditions of Shijin Irrigation System were analyzed,and a 3Dtransient surface-groundwater interaction model was established using MODFLOW software.The model was calibrated against observed groundwater level data.The results show that the model performance is acceptable and it can be used to simulate and forecast the groundwater dynamic of Shijin irrigation district.The model was applied in the well irrigation area and in the well-canal combined patterns region.Considering the well irrigation times,the well irrigation quota and the canal irrigation quota of the factors and so on,five kinds of schemes were put forward.The results show that the second scheme is the best.The well-canal combined patterns and adjustment of the time of irrigation should be used in Shijin irrigation area.The well irrigation patterns should be arranged in March,the well irrigation quota is45m3/h;the well-canal combined patterns should be arranged in May and October,and the canal irrigation quota is 1 800m2/hm2.It is simple and effective to control the groundwater level and to improve water efficiency in Shijin irrigation district.更多还原