Study On Groundwater Dynamics In Yellow River Delta Area And Its Relationship With Soil Salinization

In recent years,the Yellow River Delta land salinization becoms more and more serious.Yellow River Delta where land salinization occurs,the distribution of shallow groundwater is not the same.Saltwater and brine is Widely distributed in shallow groundwater.Currently,the shallow groundwater which is under the salinization area has not been used as the value of water resources to be exploited and utilizated.No one has yet conducted a systematic study.Do a dynamic simulation for shallow groundwater of the Study area,has an very important implications for theory and economic in governancing Saline and the sustainable development of agricultural. Dynamic simulation for shallow groundwater have a very important role in predicting groundwater,regulation of groundwater,controling of soil salinization,etc.On the basis of the Yellow River Delta region on field observations and surveys,First,the Yellow River Delta groundwater temporal dynamics were analyzed according to precipitation,evaporation data and using ARIMA model to predict groundwater.Second,earth formations and the border area of Yellow River Delta are analysised comprehensively and systematically based on the Hydrogeology knowledge etc.Software of Visual Modflow is used to simulate groundwater in Yellow River Delta and further solve the model, model identification, model verification. Again,by the collaborative Carrick interpolation in ArcGIS,Yellow River Delta 2003,2011 year 30-40 cm soil depth of soil salinity is interpolated to obtain the spatial distribution of saline soil and Soil salinization and dynamic characteristics were analyzed.Finally,according to the distribution of the water table to determine the relationship between groundwater and soil salinization.With SPSS statistical software,analyzing the correlation between groundwater and soil salinization dynamics.By regression analysis module, get the linear regression equation between the water table and soil salinization.Based on the relationship between them,to make some regional groundwater management measures to prevent and reduce the incidence of land salinization.The main results of this paper are as follows:(1) The annual variation of groundwater level is greater.Level changes during the year mainly for down- up- down cyclical changes,and lift the water table is basically consistent with the trend of precipitation distribution and evaporation intensity.(2) The results which the model of ground water output show that precipitation is simulated aquifer recharge the main item, the total amount of 85.26% recharge.Lateral seepage of seawater ranked second,accounting for 11.09 percent of recharge.The recharge of River is least,accounting 3.65%.Shallow water evaporation is the most important part of excretion items,which evaporation reached 79152.60 × 104m3, accounting for 97.43% of the total.(3) The more serious salinization land of the Yellow River Delta region are mainly located in low-lying,the flat ground elevation is generally less than 3.5m. Tamarix salt and Suaeda are tolerance of plants which grow in Heavy Saline Soil.Salinization of land distributed in the the river heights、buffer flat lowlands between post-order and depression.Above areas,salt accumulation is strong.(4) The relationship between the 30 cm conductivity of soil and groundwater level is proved great correlation.Accordance with groundwater simulation and correlation analysis,the study area is divided into three parts.Correlation analysis done in each partition,resulting in a linear regression equation for each partition 30 cm conductivity soil and groundwater level.