Study On The Space-time Evolution Characteristic Of The Quantity Of Groundwater In The Plain Area Of Jilin Province

The plain area of Jilin province mainly includes 4 cities and 17 counties,which is Changchun City,Siping City,Songyuan City,Baicheng City.The plain area of Jilin province is the core of the economic development of Jilin Province,is an important national commodity grain production base.With the increase of mining intensity of groundwater,resulting in excessive exploitation of groundwater in some areas,ecological environment became worse,which restricted the sustainable development of the study area.Therefore,it is of great significance to grasp the temporal and spatial evolution characteristics of groundwater level,groundwater resources and the correlation between groundwater resources and its influencing factors in the study areaBased on the project from water resources special project of Jilin Provincial Water Resources Department," Compilation of hydrogeologic Atlas of 1 to 50 thousand in Jilin",this paper studied the space-time evolution characteristic of Quaternary groundwater Level and groundwater resources amout in the plain area of Jilin province.The temporal and spatial evolution characteristics of groundwater level in the study area were identified by drawing the groundwater dynamic curve and the water level map of 2000 and 2014;Calculating groundwater resources amount from 2000 to 2013 years by groundwater recharge method,analyzing the spatial distribution of groundwater resources by using geographic information system,analyzing the temporal evolution characteristics of groundwater resources by 2000~2013 years evolution curve of groundwater resources,using the grey correlation method to analysis influencing factor of groundwater resources,the main research results were as follows:(1)Based on the field hydrogeology survey and the long-term observation data of underground water table,diving and confined water level contour map in 2000 and 2014 were drawn.The results show that in the study area the piedmont inclined plain groundwater level is 134 m ~ 210 m,river valley plain groundwater level is 106 ~ 198 m,groundwater level in the interchannel place of the Songhua river and Lalin river is 127 ~ 204 m,the platform of high plains of groundwater level is 145 ~ 231 m,corrugated high plains groundwater level is 122 ~ 230 m.Compared with 2000,the shallow groundwater position in 2014 is the area of the lower plains and lower plains in the lower west of the mountain area,and the water level in platform is the most significant 8.6 m.The pressure water level in the study area is 111 ~ 203 m,compared with 2000,the pressure water level in the west was lower in the lower plains in 2014,and the water level of the lower plains in the west was 15.5 m.(2)By drawing the year and annual groundwater dynamic curve,study the time evolution of groundwater level rules.The results show that the groundwater level changes with time as the same as precipitation.Changchun,Siping City and Songyuan city have little change of groundwater level,and the water level rises and falls within a reasonable range.The decline of groundwater table in Baicheng is obvious,and the range of decline is larger.(3)The recharge method is used to calculate and analyze the groundwater resources in the study area,and to compare the spatial distribution of groundwater resources modulus in different years.The results show that: The total amount of groundwater resources in the study area is 63.24×108m3/a,in which the amount of precipitation infiltration accounts for 92% of the total underground water resources.The order of groundwater resources in each geomorphic unit is as follows: Valley Plain?Western Piedmont Plain?Undulating high plains?Land between Songhua River and the river pull?Western low plain?Tableland high plain;The order of groundwater resources in each administrative area is as follows: Changchun City > Siping City > Baicheng City > Songyuan City.The modulus of groundwater resources increased generally in 2000~2005 years,the modulus of groundwater resources decreased obviously in the western low plain area in 2005~2010 years,and the modulus of groundwater in the sloping plain and the low plain in the West increased obviously in 2010~2013 years.(4)The amount of groundwater resources and the modulus of resources in the study area during the past 2000~2013 years were calculated,and according to the mining volume of each administrative area,the amount of underground water resources was analyzed.The results show that: the trend of the amount of groundwater resources and the modulus of resources changes with time is as same as the trend of precipitation varies with time.The modulus of groundwater resources varies significantly with time in Changchun and Siping regions.The modulus of groundwater resources varies slightly with time in in Songyuan city.The exploitation amount of Changchun and Songyuan is less than the exploitable amount of groundwater.In dry year,the exploitation amount of Siping City is close to the exploitable amount of groundwater.In dry year,the exploitation amount of Baicheng city exceeds the exploitable amount of groundwater production(5)The influencing factors of groundwater resource module mainly include: geomorphologic and geologic factors,meteorological factor,hydrologic factor and human factors principles.And the precipitation is the dominant factor affecting the modulus of groundwater resources.Because of the natural and human difference between the partitions,the factors in different partitions also have different impacts on groundwater resource.