某河流改道工程对区域地下水动态的影响

摘要

In order to study the impact on regional groundwater dynamics in a river diversion,the water balance method is used to evaluate the water balance of the area affected by the river realignment,and the numerical simulation on the groundwater level of the study area has been conducted for 10 years by the MODFLOW software.According to the calcu-lation results of water balance,there is a little change in the groundwater recharge and discharge of the study area after realigning of the river,and a little effect on the river downstream’s groundwater recharge.Compared with the groundwa-ter level after 10 years of the original river and realignment river in the study area,the groundwater flow field and ground-water depth area are not changed significantly,the drawdown change of groundwater level is also very small.The results show that after realigning of the river,the regional groundwater’s spatial distribution pattern would not be changed signif-icantly,and the dynamic impact on groundwater flow in the study area would also be smaller.%为研究某河流改道后对区域地下水动态的影响，采用水均衡法计算河流改道段受影响区域的水均衡情况，并利用 MODFLOW软件对研究区内的地下水位进行为期10年的数值模拟。根据水均衡的计算结果，河流改道后研究区内的地下水补给、排泄量变化不大，对河流下游地下水的补给量影响很小。对比10年后研究区内的河流原河道和改道后的地下水位，其地下水流场和地下水埋深面积均无明显变化，地下水位的降深变化很小。结果表明：河流局部改道不会使研究区域地下水空间分布格局发生明显改变，对地下水流动态影响较小。