基于潜水渗流模型的地下水实际流速

On Actual Flow Velocity of Groundwater Based on Diving Percolation Model Tests

在相似原理所建立的潜水渗流模型上开展了Darcy定律验证性实验,在满足层流及稳定流状态下,测定了不同水力坡度下的渗透流速,并依据渗透流速与有效孔隙度的比值得到了相应的实际流速,同时,在该模型上进行了示踪法测流速实验。对比发现,依据Darcy定律计算的地下水平均实际流速与示踪法测定的地下水平均实际流速存在一定的差异。为此,建立了不同地下水动力条件的潜水渗流模型进行了多组实验,发现这种差异存在普遍性,Darcy公式计算地下水实际流速比示踪剂测定的实际流速约大4.25倍。最后分析了差异存在的原因。

Darey＇ s law was adopted to calculate the average flow velocity of groundwater. The actual flow velocity was obtained based on the ratio of seepage velocilv and effective porosity, But a series of experiments eonducted found thai there is a great difference between the average flow velocity of groundwater obtained by Darcy＇ s law and that obtained by the Tracer method. Thus, different hydrodynamic conditions for physical lest models were established based on diving percolation model tests, and group tests were conducted. It is found that such difference is universal. Finally, the reasons for the differences were analyzed.