A GIS-Based Groundwater Environmental Characteristics And Discriminating Model Of Water-inrush Source Of The Old Coalfield In Huainan

Discriminanting the source of the water-inrush exactly and quickly is the precondition of the coalmine groundwater remedy.Geography Information System (GIS)is a highly efficient platform to deal with spatial information.The establishment of GIS-based discriminating model is useful to discriminate the source the water-inrush quickly which is of great theoretical and practical significance.After referring to many relative literature about the coalmine groundwater prevention and remedy,this article chooses the old coalfield in Huainan as the research area,adopts the methods combined the theoretical analyzing and case study,collects and analyses the hydro-geological,hydro-geochemical and water chemical literature of the past years.By plotting the water-level contours of the main aquifers,then analysis their dynamic characteristics and recharge-discharge correlations;By analysing the water characteristics of the whole old coalfield, takes Kongji mine field as an example,combines the Explore Function of SPSS and DTM Function of GIS,to study the distributing rules of the characteristic indexes among the main aquifers and inner one aquifer,in order to know the groundwater chemical characteristics;Considering the difference of groundwater chemical characteristics among units,the Bayes discriminating model of water-inrush source which reflects the different units are built,the returned results and examples discrimination results can improve its efficiency;Then created the groundwater chemical information management system of the old coalfield in Huainan based on the GIS technical which is easy to manage and use the correlative information,to inquiry the hydro-geological,hydro-geochemical and water chemical literature which can provide thereunders to the discrimination.The finally result shows:(1)The dynamic tendency of the aquifers'water levels is controlled by rainfall, also due to the mining drainage activities,influenced by the Huai River locally; The characteristics of limestone aquifers'water level in study area is replenished concentratedly in rainy season and consumed during perennially;(2)By using the Explore Function of SPSS,the four characteristic indexes among the main aquifers which have significantly difference and great discrimination ability can be filtrated from the numerical value distributing characteristic,they are[SO₄^2-],TDS,pH,Total hardness;Combined the DTM Function of GIS,the water-level contours of the filtrated characteristic indexes are plotted to reflect the spatial characteristic of groundwater chemical,then combined the hydro-geological,hydro-geochemical conditions and mining activities to explain the differences between the west and east area;(3)The GIS-based multiclass linear discriminating model of water-inrush source of different units in Kongji mine field which uses the general water chemical indexes can reflect the hydro-geological,hydro-geochemical conditions and the influence to water chemical environment by mining activities,impersonally and exactly;By the returned result inspection and examples discrimination results, the effect are better;(4)The groundwater chemical information management system of the old coalfield in Huainan based on the GIS technical which can easily manage the correlative information of the hydro-geological,hydro-geochemical and water chemical literature,to inquiry many kinds of information correlated with the discrimination.