摘要
地下水在渗透介质中的流动是连续的,受补给与排泄条件的影响,在同一渗流场中会出现若干水流系统,称为地下水流的分异。通过简易的试验装置,可以容易地模拟这种水流分异的情形。相应试验如下:在均质各向同性的渗透介质中,保持顶部自由水面补给边界的水头不变,在不同排泄条件下、存在弱透水层、相对隔水体及放置局部加热装置的情况下,分别得到了地下水流分异的情形。结果表明:水流在不同渗透介质间确实存在折射现象;在弱透水体或相对隔水体的边缘,水流具有加强、聚集的性质,即渗透流场中存在强径流带;与流场总体流向不一致的方向上,会出现向隔水体靠近的"浮流"现象;水流加热后,其径流速度明显加快。
Groundwater has the continuous flow in the infiltration medium and because it is affected hy recharge and discharge conditions,there appear lots of flow systems in the same seepage field,called groundwater flow fractionation. Through the simple test apparatus, the case of such flow fractionation will be easily simulated. The corresponding test was completed as follows. In homogeneous isotropic permeability media, the head of the top of tHe free water surface was kept to recharge boundary unchanged; under the conditions of different discharge the presence of the aquitard, relatively impermeable body and placed the local heating device, the groundwater flow fractionation situation was obtained respectively. The results show that refraction phenomenon does exist in different permeable media of groundwater flow; on the edge of aquitard and relatively impermeable body,the flow has the properties to strengthen and gather together; that is to say,there is strong flow zone in the seepage field; when it is in the inconsistent direction with the overall flow direction of flow field, there will appear the ＂ floating flow＂ phenomenon that the flow comes close to impermeable body; after the flow is heated, its runoff rate will significantly accelerate.
出处
《山东科技大学学报（自然科学版）》
CAS
2013年第2期17-24,共8页
Journal of Shandong University of Science and Technology(Natural Science)
关键词
地下水
渗透介质
试验
水流分异
groundwater
infiltration medium
experiment
groundwater flow fractionation
