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竖管测定法可现场测定河床的渗透系数。采用人工梯度法和自然梯度法两种方法 ,对普拉特河位于卡尼市 (KearneyCity)东南河段河床的垂直、水平和任意方向的渗透系数进行了野外现场测定。 1 0个测点的垂向渗透系数的平均值为 3 0 5 1m/d ,一个测点的水平方向渗透系数为 97 2m/d ,其各向异性比率约为 3。结果表明 :普拉特河床沉积物剖面上具有一定的各向异性 ,平面上为非均匀介质。
Vertical tube determination of the river bed can be measured on-site permeability coefficient. The artificial and natural gradient methods were used to determine the vertical, horizontal and arbitrary permeability coefficients of the Pratt River in the southeast of Kearney City. The average vertical permeability coefficient of 10 measuring points is 3 0 5 1m / d. The horizontal permeability coefficient of one measuring point is 97 2m / d and the anisotropic ratio is about 3. The results show that there is a certain anisotropy on the Plat sediment sediment section and nonuniform medium in plane.