淡水垂向回注修复地下咸水试验研究

Experimental Study on Vertical Reinjection of Fresh Water for Restoration of Underground Salt Water

采用一维垂向模型连续注水试验,在不同注水方向、不同注水速率条件下模拟淡水垂向回注修复地下咸水。在试验模拟基础上建立一维变密度水流运动和溶质运移数学模型,通过数值模拟分析变密度流体垂直异向流动规律,并探讨了最有效的咸水淡化模式,结果表明:在相同注水速率条件下,顺重力方向注水修复地下咸水体相较于逆重力方向来说试验用时短,用水总量小,是一种更为有效的修复方法;随着注水速率的减小,修复所用时间大幅增加,总用水量减小,但注水速率较小时分子扩散作用的影响不可忽略。

Based on one dimensional vertical experiment considering vertical water injection direction and water injection rate this studysimulated the law of variable density fluid in different directions under continuous water injection condition. On the basis of the experimental simulation, a one-dimensional variable density flow and solute transport mathematical model was established, the vertical isostatic flow law of the variable density fluid was analyzed by numerical simulation and the most effective salt water desalination mode was discussed. The results show that under the same water injection rate, the subsurface saline water body is repaired by water injection in the direction of gravity in the direction of the same water injection rate. In the reverse direction, the test time is short and the total amount of water is small. It is a more effective repair method. With the decrease of water injection rate, the time of repair is greatly increased and the total water consumption is reduced, but the effect of water injection rate is not negligible.