摘要
本文论述了在武汉市长江底部第四纪孔隙含水层中用单井稀释法测定地下水流速、流向实验的过程和结果。并对在这种试验条件下所得的测定结果进行分析讨论,得出了相应的结论。测试结果表明:武汉长江底部JC II 6号钻孔处地下水流向从上到下都受到地表长江水流的影响。上部受到影响大,而深部较弱,地下水流向从上到下逐渐向东偏转35°左右。上部中细砂层中的地下水流速,大于下部粗中砂层中地下水流速。本次测试由于测定点靠近江心地下水排泄带,其地下水和地表水的水头差0 5m左右,试验虽然采取了特殊的施工工艺,也还可能受到垂向流的微小影响,使测试结果中的水流速度比实际地下水水流速度可能要稍偏大些。但因本点水文地质条件决定了三段之间或地下水流和江水之间无明显的水头差,所以引起的误差不大,可以忽略不计。
This paper discussed the process and result of the determination of the velocity and direction of groundwater flow using single well dilution method in a well opened at the bottom of the Changjiang River in the aquifer of Quaternary Period among Wuhan city. Besides it analyzed the result and got some corresponding conclusions, which show that: The surface flow of the Changjiang River has great effects on the direction of the groundwater in JCII6 bore at the bottom of Changjiang River, which change the direction of the groundwater to the east gradually about 35°.The effect on above layer is greater than that on deeper layer. The velocity of the groundwater in the above midfine sand layer is greater than that in the deep midcoarse sand layer. Although we took special construction techniques in this experiment, the menstruation spot is near to the discharge zone in the middle of the Changjiang River, the vertical flow has effect on the mensuration, thus the testing velocity of groundwater is bit greater than the actual velocity of groundwater. The hydrogeological conditions of this spot determine that there is no obvious water level difference in the three layers and between the groundwater and Changjiang River water. So, the error caused by above reason is very slim and can be omitted.
出处
《水文地质工程地质》
CAS
CSCD
2003年第2期74-76,82,共4页
Hydrogeology & Engineering Geology
