Analysis of the effects of the sinkhole size on the drainage process of fissure-conduit media
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Abstract:
The effects of the sinkhole size on the drainage process of fissure-conduit media were analyzed using the self-designed physical model of fissure-conduit media. The media was divided into three regions according to the structural characteristics of the media voids. Water discharge per unit time, a concept that represents the speed of water drainage, was introduced. The water discharges per unit time of the three regions and of the media as a whole were calculated. The water discharge per unit time was used to analyze the effects of nine different sinkhole sizes on the drainage process of the fissure-conduit media. The results showed that as the cross-sectional area of the sinkhole increased, the water storage volume and water conducting volume of the media were enlarged, and the drainage speed was enhanced. It was only when the cross-sectional area reached a certain threshold that the drainage process would respond to the increase in the cross-sectional area of the sinkhole. This threshold depended on the structure of the media voids. The three different stages of the drainage process had different thresholds. The threshold in the final stage was smaller than that in the initial or middle stage.
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