| The thesis is supported by the key project of Jilin province‖groundwater modelresearch of Jingyu Mineral Water Source‖, to expand monograpHic study on therecharge mechanism of Jingyu Nature Reserve mineral water. Jingyu Nature Reserveof Jilin province is located in the southeast of Jilin province, the Songhua Riverupstream, the changbai mountain hinterland, the southwest of Jingyu County, and thetotal area is150.38km2. It is a Nature Reserve that the main protection objects are thegeological heritage of mineral spring group and volcanic group. The rich mineralwater resources are occurrenced in Jingyu Mineral Water Nature Reserve, and therehas been found17mineral springs and13mineral springs have been passed theidentification and evaluation of national and provincial. The yield of mineral springs isvery abundant and has a lot of mining potential. So the study on supply source ofnatural mineral water has the very important theoretical and practical significance forthe sustainable development of Jingyu mineral water and looking for new sources ofmineral water.This paper is based on a large number of geological and hydrogeological data ofJingyu mineral water protection zone, combining basalt and water-bearing mediacharacteristics of the study area, the hydrogeochemical reverse analog method andisotope method are used to analyze the recharge sources of mineral water in the studyarea, the age of groundwater circulation and the range of groundwater recharge.According to the the measured drilling in the study area and virtual drilling of thereference geophysical interpret data and other geological data, The terrain of JingyuCounty is Southwest high and North East low, and there is three sets of fault structures:east to west, north to west and north to east. AtmospHeric precipitation is easilyinfiltrated because of the large topograpHic relief, dense vegetation and the developedholes and cracks in basalt conducive.90%of the groundwater in study area is basalt holes fissure water, which mainly hosted in basalts of the Quaternary update systemwarships mountain group. Spring water dynamic stability, the main type of waterchemistry is HCO3-Ca type water which riched in silicic acid and strontium.The experimental wells (67~69m and80~83m), five longquan, WangDaShan,sihailongwan, fly Longquan and white pulp springs7representative rock samples inthe study area are detected and analyzed to determine the mainly mineral compositionof basalt is basic feldspar and pyroxene, the secondary mineral is olivine, hornblendeand biotite. According to the rock minerals and the chemical composition of watersamples, the corresponding mineral pHases are selected to set up thehydrogeochemical reverse model on the groundwater flow in the study area. Thechemical composition changes of mineral water in the study area is determined inaddition to the water-rock interaction, as well as the result of precipitation and surfacewater into the ground and groundwater are mixed and evaporation concentrating. Inaddition, the silicic acid and strontium of the mineral water in the study area are fromthe dissolved silicate minerals and strontium-containing minerals. Its main supply isaffected to aqueous rock mineral dissolution.The origin, formation conditions and recharge mechanism of groundwater arerevealed through the differences and variation of oxygen and hydrogen isotopecomposition between the water samples and atmospHeric precipitation in the studyarea. The values of D and18O in the mineral water are no different than the values ofD and18O in precipitation, indicating that the groundwater is mainly recharged byatmospHeric precipitation. Tritium isotopes in the mineral water is generally5to15(TU), which can be roughly estimated the cycle time of groundwater in the rock maybe20to40years. The recharge altitude is calculated between852~997m based onstable isotope of mineral water in study area and recharge altitude formula of previousresearch,which analyzes the recharge range of mineral water.Jingyu mineral water protection area is located in the eastern mountain area ofJilin Province. Mountain groundwater generally belongs to the whole excretion type,groundwater recharge is basically equal to the amount of groundwater discharge, sothe amount of groundwater recharge can be calculated by the base flow cut method orgroundwater excretion. According to the recharge, runoff and discharge conditions of groundwater in the study area, vertical vector is mainly atmospHeric precipitationrecharge and the groundwater evaporation excretion and to lower groundwaterexcretion are very small which are negligible. The groundwater lateral recharge andexcretion are level amount. The calculating areas around are mostly small watershedswhich are impervious boundary, therefore the groundwater lateral recharge dose notconsidered. In this paper, the water balance method is used to calculate the mineralwater recharge of the study area. The total mineral water of the study area is93917m3/d, and the quantity of flow of the white pulp spring is36400m3/d which is39%in the total amount of mineral water. The white pulp spring is also the largest dailyflow springs in Changbai Mountain area. The groundwater recharge of the entire studyarea is4550.69m3/a which contains atmospHeric precipitation recharge and riverrecharge, and the precipitation recharge is3567.37m3/a, the river recharge is983.32m~3/a. |
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