Aiming at the immersion problem caused by impoundment in plain area, taking the Songyuan reservoir project as an example, and on the base of generalizing the hydrogeologic structure of the left bank of Songyuan reservoir for a minding model, a three-dimensional transient flow numerical simulation model for predicting the immersion of the left bank of Songyuan reservoir project was built. The theory of three-dimensional finite difference numerical simulation was applied and the immersion area was obtained by simulation according to four impoundment schemes of non-diaphragm wall from the end of each month of April to October and with 4.05, 8.05 and 12.05 km diaphragm wall in the end of August. The results show that the total area of minimum immersion of non-diaphragm wall scheme is 127.62× 104 m2 in April, and then gradually increases. It reaches the maximum with 1473.94×104 m2 in August, and then decreases. As the diaphragm walls are arranged along the left bank of reservoir in the unconfined aquifer, the immersion area decreases slightly.%针对平原区水库蓄水后引起的浸没问题,以松原壅水坝工程库区左岸浸没为例,在概化出库区左岸水文地质概念模型的基础上,建立了松原壅水坝工程库区左岸浸没预测的地下水三维非稳定流数值模拟模型,并采用有限差分模拟方法,按无防渗墙和长为4.05、8.05及12.05 km 3种不同防渗墙蓄水工况方案进行预测,获得了无防渗墙蓄水工况4-10月底逐月的和3种不同防渗墙蓄水工况8月底的浸没范围.计算结果表明:无防渗墙蓄水工况方案4月份浸没范围最小,总面积为127.62×104 m2,随后逐渐增大；8月份浸没范围达到最大,总面积为1 473.94×104 m2,而后又逐渐减小；随着在潜水含水层沿库区左岸布置防渗墙的加长,浸没范围逐渐减小,但减幅不大.该研究可为今后水库蓄水引起的库区浸没模拟预测提供参考.
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