The Study Of Theory And Test Method About Connection Tracing In Groundwater With Artificial Chemical Reagent

Connection Tracing Test(CTT) is a detecting method which is used for obtainingthe water dynamical attribute of the systemic natural flow field. First, It need inputsome substance which can move along with groundwater in one selected point, thenreceives and assays the substance in the expecting arrived points. According to thetesting result, and analyzing the character of media field and potential filedsynthetically, we can get the flow field information. In the paper, the origin,development and research actuality of the CTT are summarized. In addition,groundwater solute transport equation in porous media is educed, commonmechanism of hydrodynamic dispersion is opened out, and effecting factors ofhydrodynamic dispersion coefficient and dispersivity are discussed. Based on aboveresults, the paper has established 20 typical CTT geological models which can dividedinto 4 kinds and has simulated the transport process and results of tracer for eachmodel with Visual MODFLOW. After analyzing the result, the application conditionsof CTT are gotten, and the tracer dosage and observation frequency are given, then,the common rules of groundwater connection tracing curve are summarized. In thispaper, the study for the property and application conditions of three typical tracerssuch as Sodium Chloride, Basic Fluorescent Red 8B and Ammonium MolybdtaeTetrahydrate is another emphasis. Their relevant assay methods are: electricalconductivity assay method, fluorescence analysis method and catalytic polarographicmethod. Taking the CTT in groundwater with artificial chemical reagent oncontinuable economic heavy chemical industry base in SuiYang of Guizhou as anexample, multi-element CTT method was studied. In these tests, different tracers hadbeen adopted on different conditions. In short range, NaCl was selected; onintermediate range, Basic Fluorescent Red 8B was chosen; for long-distance rangetest with multi-field and across watershed of surface water, Ammonium MolybdtaeTetrahydrate was used. The test result was quite remarkable one, from which the karsthydrogeological status of the base district was found out.