Study On Groundwater Dynamic In The Urban Of Jilin City

In order to ensure the jilin city human life and social development,more scientific management of groundwater in the region,through long-term monitoring of groundwater and studying the space distribution features of underground water level and time change process,discusses the water level,time and space change rule and influence factors,and put forward the jilin city water level control scheme,the article conclusion is as follows.According to the analysis of groundwater dynamic data,it can be known that the dynamic characteristics of groundwater in the urban area of jilin city basically maintain the dynamic characteristics of groundwater in the natural state(except the groundwater exploitation areas).There are four types of groundwater dynamic changes during the year.The groundwater recharge of meteoric infiltration and evaporation type is mainly meteoric infiltration,and the drainage mode is mainly evaporation.Infiltration-runoff precipitation infiltration is the main recharge source of groundwater,and lateral runoff is the main way of discharge.Infiltration-mining artificial mining is the main way of drainage;Hydrologic groundwater is mainly affected by the hydrological situation.The analysis of the evolution process of groundwater level over time in the study area can be divided into three time stages: pre-2000,2000-2010 and 2010-2016.Before 2000,due to the low degree of artificial exploitation,the change of water level was mainly affected by meteorological factors.In years with less water,the groundwater level decreased slightly,and the groundwater could be well replenished in years with abundant water.The variation of the groundwater level is small,and the variation of the groundwater level is 1-2m for many years.Relative increase from 2000 to 2010,the artificial exploited water,underground water level has obvious drop,in the years less water in wet year get corresponding supplement,get a good supply of groundwater,on the whole did not cause environmental hydrogeological problems of declining water level,but the underground water level range is larger,years transformer for 3 to 5 m,groundwater exploitation of groundwater caused certain effect,when the low water year in a row,can make the groundwater continued to decline.From 2010 to 2016,the amount of groundwater extraction was large.Although the groundwater was compensated in the years with abundant water,the recovery of the groundwater level in the years with abundant water was small due to excessive mining.Even in the years with abundant water like 2010,the groundwater level also decreased,and the groundwater level changed over 5m for many years.However,there are few such dynamic type distribution areas.On the whole,groundwater in jilin city flowed from both sides of the songhua river main stream to the middle in each five-level drainage basin,from the southwest to the northeast in the oolong river basin and the wende river basin,from the southeast to the northwest in the nongniu river basin and tuanshanzi river basin,and from the southeast to the northwest in the whole.In the plain area of the research area,due to the influence of mining,irrigation and other human activities,the ground water drop funnel exists along the areas of huapichang town-gudianzi town-wulajie manchu town-big chin manchu town.Surface rivers in the valley plain area have a great influence on the submersible water level burial depth,and the range of variation is 0~5m.The submersible water level near the river is small,and the submersible water level at the interfluvial block or watershed is large.Groundwater level burial in terrace is controlled by geomorphologic type and groundwater flow field.The groundwater level data,annual precipitation data,evaporation data and mining data of long series long guan Wells in the research area were analyzed.Through the establishment of multiple linear regression model,it can be seen that the factors influencing the groundwater level in the study area are the water level value of last month,the precipitation of last month,the precipitation of current month,the exploitation amount and the evaporation amount.To sum up,the biggest factor affecting water level is the water level of the last month,followed by precipitation,followed by evaporation and extraction.In this paper,the factors affecting groundwater level are calculated and analyzed.Firstly,a multiple linear regression model is established to draw a conclusion that the factors influencing groundwater level in the study area are the water level value of last month,the precipitation of last month and the precipitation of current month.Then through the grey relational degree analysis method,the weight of the influence of each factor on the water level can be obtained,and the factor with the greatest influence on the water level can be obtained.The biggest factor affecting groundwater levels is the level of the previous month,followed by precipitation,followed by evaporation and extraction.Finally,the correlation method is used to analyze the relationship between precipitation,exploitation amount and groundwater level.According to groundwater resources conditions of jilin city,jilin region is divided into 12 management division,through the experience value,historical data,the related relations determines the upper limit and lower limit of the groundwater table of each partition,and according to the management requirements,to bend low hilly land,cylinder kiln trough area,through the low hilly land,pot mountain hilly land,cypress valley valley plains plains,proper partition is divided into six stable management of the groundwater table partitions,Will birchbark factory valley plains,the solitary shop valley plains,ho street valley plains,DaTun valley plains,rosefinch mountain low hilly land and the flourishing partition is divided into six decline,such as low mountainous area partition type management,according to the situation of each partition water level,water level control and predict water level lower limit value after five years,stable should maintain the development and utilization of the status quo,put forward appropriate increase mining,and drop type control,improve the efficiency of water,reduce water consumption,especially lonely shop-birchbark factory town of irrigation area,should take reference to surface water irrigation,reduce groundwater irrigation water use,the normal water level of drawdown funnel area gradually.