黄河下游断流对沿岸地下水形成与开发的影响

黄河下游河段断流对沿黄地区生态环境影响严重。以1999年为基准年,利用黄河下游侧渗补给影响带地下水系统模拟模型研究了黄河断流对黄河侧渗量及地下水循环的影响。花园口—河口断流300d,黄河侧渗量减少53.8%。夹河滩-河口全年断流,黄河侧渗量减少75.2%;断流300d,黄河侧渗量减少46.3%。泺口—河口全年断流,黄河侧渗量减少25.1%;断流300d,黄河侧渗量减少19.8%。利津-河口全年断流,黄河侧渗量减少4.7%。断流对黄河侧渗补给影响带地下水流场的形态影响较小,浅层地下水系统边界的水力性质没有改变。断流对黄河下游傍河水源地开采动态水位影响较大,但宏观上对侧渗补给影响带地下水资源不会产生较大影响。

Impact of Lower Yellow River Flow Cutoff on the Formation and Exploitation of Groundwater in Alongside Areas

The frequent flow cutoff has serious effect on eco-environment of the region along the lower Yellow River.The authors studies the impact on lateral seepage quantity and groundwater cycling caused by flow cutoff of Yellow River and compares it with that of the year 1999 through the numerical simulation model of groundwater flow system of affected zone.The lateral seepage quantity will decrease 53.8% on condition that the flow cutoff stage from Huayuankou to river entrance and breaking time is 300 days.The lateral seepage quantity will decrease 46.3% if flow cutoff from Jiahetan to river entrance and breaking time were 300 days,and it will decrease 75.2% if flow cutoff occurs throughout the year.The lateral seepage quantity will decrease 19.8% if flow cutoff from Luokou to river entrance and brea-king time were 300 days,and it will decrease 25.1% if flow cutoff throughout the year.The lateral see-page quantity will decrease 4.7% if flow cutoff from Lijin to river entrance and flow cutoff throughout the year.Flow cutoff of Yellow River has minor effect on shape of groundwater flow domain of affected zone,so the boundary feather of shallow groundwater system will not change.Though flow cutoff has major influence on the riverside source fields in the lower Yellow River,yet it won't has great effect on groundwater resources in the affected zone of Yellow River.