Study On Dynamic Characteristics Of Groundwater In Baoji Gorge And Wool Bay Irrigation District

Baoji gorge and Wool Bay irrigation district is a large irrigation district in Shaanxi province,which is a major food,fruit and vegetable production base in Shaanxi province and the whole country.In recent years,the demand for water resources has increased because of the growing population and rapid development of agriculture and agriculture.Because of the over-exploitation of groundwater,a series of environmental geological problems have been created,which seriously affect the safety of the irrigation area.So to ensure the sustainable utilization of groundwater,we must study of groundwater dynamic under the influence of various factors,analysis and forecast of groundwater dynamic change rule,in order to make rational groundwater exploitation plan,achieve the goal of economical pesticides.The main results of this study are as follows:(1)Atatistics the change of groundwater depth in irrigation,well the proportion of the total difference in the different level of groundwater depth showed a downward trend in the observation well accounted for significant rainfall,which has a great influence on the groundwater;groundwater depth more than reached the minimum value in the beginning or at the end of the year,the maximum value in three months of7,8,9.(2)From 1982 to 1990,the groundwater depth of observation wells in loess plateau area tended to decrease,and the groundwater depth of observation wells in Weihe terrace area tended to increase;From 2002 to 2014,groundwater observation wells of alluvial fan depth and more decreased in other areas of groundwater observation wells more increases.(3)Combination of MAPGIS software and SUFER draw isoline map of ground water level in the study area,analyzing its space characteristics,the maximum treasure sheep irrigation area ground-water level in Qian county,the minimum is located in the territory of Xianyang,high underground water level and the northwest,southeast low consistent with terrain change trend.(4)Using the evaluation method of single item index and comprehensive evaluation method to grade the groundwater quality in irrigation,the water quality deteriorated in 2002 ~ 2012.Are ? class observation well water in 2002,2006 in the Weihe River terrace area and tableland depression appeared between ? class water,between the Weihe Riverterrace and tableland in 2012 lowland areas appear ? class water.(5)Using time series analysis of ARIMA model to forecast the buried depth of groundwater for irrigation area typical Wells that irrigation area of groundwater depth still offers a slow downward trend in the near future.To predict groundwater buried depth and 2016 to 1986 and irrigation area,comparing the operation before 1986,treasure sheep irrigation groundwater buried depth,but still higher than before running embedded depth of groundwater in the irrigation area.