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Relative permeability
Large amounts of hydrogeologic survey data show that the Kanshang iron mine is divided into 2 parts,under complicated hydrogeologic conditions with 4 aquifers and 2 aquitards.With the methods of big-well and numerical simulation,yield of well is predicted.The result is that the normal yield in the north part is(3 067)m~3/d,(23 400)m~3/d in the south part.
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The systematical analysis of data obtained is made combined with practical hydrogeology test.The data are treated with computer software for special hydrogeological parameters to obtain hydrogeological parameters at the test zone.Hydrogeological parameters obtained are discussed,the rationality of well pattern employed for hydrogeological test is analyzed,and suggestions are proposed.
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Groundwater model
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This paper confirms that the mining of the coal bed methane (CBM) are most significantly influenced by the hydrogeology parameters of the reservoir itself, the hydrogeology parameters, the supply properties and the geological structure of the roof and floor and other neighboring water-bearing rocks hydraulically associated with the coal bed as well as the difficulty degree of CBM mining; a evaluation indicator system structure of the hydrogeology conditions are established based on the foresaid conclusions and the CBM mining hydrogeology conditions are divided into “beneficial, moderate and adverse” grades; this paper finally divides the threshold to grade the hydrogeology condition evaluation indicators and a complete CBM mining hydrogeology conditions evaluation indicator system is founded to evaluate the hydrogeology conditions.
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The determination methods of hydrogeological parameters in the aquifer are mainly involved in pumping test,slug test,water-pressure test and numerical inverse analysis.A new method is developed to determine the hydrogeological parameters.According to transport law of each chemical component in natural groundwater,using transport equation of mineral chemical component,adsorption and dissolution kinetics equation of mineral are developed by the expression of chemical kinetics,chemical thermodynamics and groundwater dynamics.And the analytical expressions of hydraulic conductivity efficient and transmissibility coefficient are denoted by chemical indexes.Based on water quality of research area,hydrogeological parameters of aquifer can be determined by hydrochemical kinetics method.The method is applied to determination of hydrogeological parameters of aquifer in underground workshop area of some pumped storage power station.Furthermore,compared with results of water-pressure test,consequently,validity of the method is testified with wide application.
Slug test
Specific storage
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We hydrogeologists have waited for many years and some 70 volumes of the series of Benchmark Papers in Geology (Hutchinson Ross) for a definitive review of the theoretical development of hydrogeology. Our patience has been rewarded with two volumes, Physical Hydrogeology (edited by R.A. Freeze and W. Back) and Chemical Hydrogeology ). From a historical perspective, this appears to be a logical division of the subject. The two branches of hydrogeology evolved along separate pathways for many years. In the 1960s the influence of the groundwater flow regime on the geochemical nature of groundwater was first described in a qualitative way. In a 1970 Meinzer Award‐winning paper, the synergisms of groundwater flow, chemical thermodynamics, and mineral equilibria were eloquently described by Back and Hanshaw. The 1970s saw mass transport equations developed whereby physical flow of groundwater and transport of conservative solutes were quantitatively linked. Current research driven by the need to understand contaminant transport and attenuation mechanisms in groundwater is so linking physical and chemical hydrogeology that future review volumes may not be so conveniently divisible as these.
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The hydrogeology parameters must be determined firstly when we predict the groundwater level. However, it is very difficult to determine the areal hydrogeology parameters. Based on the data of water level and exploitation quantity, the author used the simplex algorithm to solve the inverse problem of groundwater level prediction model and got the hydrogeology parameters of Shangqiu experimental district.
Groundwater model
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The hydrogeological parameters are important for studying groundwater movement problems,therefore,to obtain the parameters is main contents about hydrogeological work,the hydrogeological holes will be used to grasp hydrogeological situation on aquifer as investigating the hydrogeological conditions,moreover,the water pumping test is a good way to obtain effectively the parameters about hydrogeology,providing sufficient accordance for future precipitation construction of underground space.The hydrogeological parameters are analyzed in single water pumping test in the paper based on this.
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The hydrogeological parameters were evaluated inversely by manual parameter adjustment,zone dividing and point input parameter adjustment methods,based on the GMS groundwater numerical simulation.These three inverse evaluating methods had been comparatively analyzed,which showed that zone dividing parameter adjustment method based on manual adjustment possesses higher precision and better fitting to the actual hydrogeology condition.The instance results show that these three methods on hydrogeological parameters are all practicable.
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North section of Debuzhuang gypsum deposit locates in west of Pingyi depression.Through simple geology hydrogeology catalog of geology holes and stratification pumping tes of hydrogeology holes in study area,hydrogeological conditions of deposit and moisture characteristics of gypsum belt have been identified,boundary condition models of hydrological units have been determined,and normal water inflow and maximum water yield have been predicated by using hydrogeological analogy Law.On these basis,hydrogeological conditions have been classified as moderate type deposit.
Inflow
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