3-Dimensional experiment to the effect of pipe drainage for spring water control: experimental studies on spring water control depending on 3-dimensional sand model experiment

摘要

In the cultivated land, generally, groundwater moves in all direction. However normally, we ignore one direction and approximate that condition to 2-dimensions. In case, there is spring water in the cultivated land, water table is almost always 3-dimensional. In this paper, we have analyzed the pipe drainage effect for spring water control with a 3-Dimensional Sand Model Experiment depending on relative installation. The results obtained are summarized as follows: (1) Y-direction length ratio (Drain interval) of pipe drain significantly affects the groundwater table. (2) In case the X-direction installation ratio (Drain interval) changes from 0.5 to 1.0 and the Y-direction ratio (Drain length) changes from 0.8 to 0.6, water table will raise rapidly. (3) Under the condition that the X-direction installation ratio is 0 approx 0.5 and the Y-direction installation ratio is 0.6 approx 0.8, mean groundwater level nearly equal the case of the pipe drain installed right above the spring.