应用动态观测资料计算潜水水文地质参数的初步尝试

AN ATTEMPT OF USING OF THE OBSERVATION ON REGIME OF GROUNDWATER TO CALCULATE THE GROUND WATER HYDROGEOLOGICAL PARAMETERS

在地下水资源计算中经常应用的主要水文地质参数有四个—K、μ、α降、α灌。其中K值(渗透系数)是比较容易获取的,特别在机井广泛分布的地区,一般均可获得较为理想的结果,因试验简单易行,便于控制较大面积,其代表性自然较好。富平地区用此资料编绘的k值分区图,反映特征基本与水文地质条件一致。

Data from observations on the leakage of waetr channel, the fluctuations of ground water table and the water balance in small area are analysed with mathematic statistics method in the aim of findingout a simple way in calculation of the hydrogeological parameters.The following eqnation is used for finding the parameters:h1-h/2 = (h1 -h2)Mwhere h'1 - groundwater level (M) of the observation Well before water flows into the channel.h'2 = groundwater level (M)of the observation well after the water running a time of th1, h2 = water levels of the chatinel before & after the water running a time of t respectivelyM = Gauss' error, a function of the pressure transmission coefficient (a) , time (t) and distance (x) between the observation well & the channel,M= 4r2erfc(Z) = 4r2erfcthe value of M may be found from a table.Then (a) is found found from the above formula and use a =KH/μ, thethe coefficient(μ) of the yielding of water of water of the groundwater aquifer is found.The infiltration indexd (α) is determined by α= μΔh/P whereΔh-theamplitude of ground water level flucttuation in metres.p = precipitationFor the convenience in computation, one variable linear regression calculation is introduced here in addition, Using data of small arial water balance the two parameters, μ&α, can be readily found.The parameters derived from the above method agree quite well with these derived from piping test method.