Study On The Difference Characteristic Of Hydrochemical Dynamics Of The Four Springs In Jinan

There are four well-known spring groups including Baotu Spring,Black Tiger Spring,Pearl Spring and Five Dragon Pool Spring in the urban area of Jinan.Along with economic and social development,a series of water environment problems have resulted,such as reduced spring flow and deteriorated water quality.This article mainly takes Jinan's four major springs as the research object,carrying out spring water collection and water chemistry testing,spring dynamic monitoring,hydrogeological drilling,hydrochemical tracing and indoor dissolution experiments.From the four major springs'water chemical composition,water temperature and conductivity,etc.Starting with the data,the combination of laboratory experiment results and hydrogeochemical simulation calculations was used to analyze the characteristics of the formation of water chemistry differences in the four major spring groups,and the proposed measures for the protection of the spring water quality of the four major spring groups have important practical value and theoretical significance.Through analysis and research,it is concluded that:?1?The cations in the water of the four spring groups are mainly Ca²⁺,and the anions are mainly HCO₃^-,.The chemical characteristics of groundwater in Jinan Springs indicate that the chemical types of Baotu Spring and Black Tiger Spring are mainly HCO₃·SO₄-Ca,and the chemical types of Five Dragon Pool Spring and Pearl Spring are HCO₃-Ca.?2?The conductivity characteristics of the springs in four spring groups generally show the following trends:Black Tiger Spring>Baotu Spring>Five Dragon Pool Spring>Pearl Spring,indicating that these two springs have a long supply path.According to the spatial distribution characteristics of conductivity,the overall law of conductivity of the four spring groups gradually decreases from south to north.?3?The average water temperatures ofFive Dragon Pool Spring,Pearl Spring,Black Tiger Spring and Baotu Spring are 17.85?,17.8?,17.32?and 17.44?,Among them,the water temperature of Five Dragon Pool Spring is obviously higher than that of other springs,followed by Pearl Spring,followed by Black Tiger Spring and Baotu Spring,There is a difference in the circulation depth of the replenishment source water.?4?The formation lithology,water-bearing medium structure,dissolution and runoff channel differences in the spring area affect the formation of the water chemical composition of the spring water.The water-containing medium of the four spring groups is mainly karst pipelines with a large catchment area.The ions in the groundwater may be derived from external water at a far distance,and the karst spring is an open system with close contact with the atmosphere,rapid water circulation and water volume The water and water quality update rate is faster,so the Cl^-,SO₄^2-and NO₃^-concentrations in the four springs are relatively small.?5?It can be seen from the results of the dissolution experiments of different lithologies that the vertical mixed rock layer has a greater impact on the water quality than the single lithology.The actual field formation conditions of alternating water flow dissolution is a complex karstification process.According to the conventional ion content data of the four major spring groups,it can be seen that the Ca²⁺,Mg²⁺and HCO₃^-content of the Black Tiger Spring and Baotu Spring are relatively high,indicating that the dissolution of Baotu Spring and Black Tiger Spring is stronger than that ofFive Dragon Pool Spring and Pearl Spring.?6?Through the establishment of a mixed model of different water sources,it shows that in recent years,the proportion of surface replenishment springs in the replenishment water sources of the four major spring groups has become higher and higher.Larger;Xingji River supplementary source water has better replenishment effect on Black Tiger Spring,Five Dragon Pool Spring and Pearl Spring;Yufu River supplementary source water has replenishment effect on the four spring groups,and the effects of replenishment source are from large to small The order is:Baotu Spring>Black Tiger Spring>Pearl Spring>Five Dragon Pool Spring.?7?The reverse simulation calculation of hydrogeochemistry shows that although the overall hydrochemical characteristics of the study area are affected by the dissolution and precipitation of calcite,dolomite,rock salt and gypsum and the alternating adsorption of cations,the dissolution?precipitation?of calcite and aragonite is Ca²⁺in water The main source of gypsum and anhydrite is a small proportion of dissolution.