Spatio-Temporal Dynamic Variability Analysis And Simulation Of Groundwater In People’s Victory Canal Irrigation District

People’s Victory Canal Irrigation District is the first large-scale irrigation project construction of the lower reaches of the Yellow River, and it is important grain, cotton and oil production base in China. In the background of regulation of water resources and shortage of water resources in the Yellow River basin,underground water is particularly significant in irrigation district. At present, there is still some groundwater level in irrigation district that it is too low, or the depth distribution is very uneven, if things go on like this, they are very unfavorable for the rational development of water resources and sustainable development. So the temporal and spatial variation of groundwater irrigation is related to the research by analysis and dynamic prediction rules, so as to correctly understand the evolution law of the groundwater system, and reasonable exploitation and utilization of water resources.It is key to keep the sustainable development of underground water resources.In this paper, by analyzing the cause of dynamic change of underground water influence factors, the people’s Victory Canal Irrigation District’s underground water dynamic variation characteristics is in-depth researched from the two aspects of time and space, and then its underground water model is established on the base of the regional water balance. Through the numerical simulation of different levels in the underground water, the buried depth changes are analyzed and forecasted. Mainly research content includes the following aspects:(1)Analysis of temporal and spatial variation of underground water in irrigation district. The time series analyses the inter annual and annual change in the trend analysis method; By the interpolation method, underground water dynamic spatial structure characteristics of intellectual and annual analysis are reflected in space. It is showed that the underground water depth of 30 years is the basic downward trend in the irrigation district, the ending canal declines the most quickly,the middle canal declines more quickly, the heading canal decreases obviously; The level for the yearis in a high water level in winter, it is in a low water level in late spring and early summer.(2)Analysis of the underground water of the external environment influences factors in trend analysis. Influencing factors of dynamic change of underground water may have caused the quantitative analysis of time series, in-depth understanding of the characteristics of each factor. Showed that climatic conditions,precipitation, evaporation over the years show a rising trend, and the interfacial fluctuations; uneven distribution of human activity factors, water diverted from the Yellow River, the amplitude of intellectual variations of large underground water exploitation amount, and the regional differences. Combined with the temporal and spatial variation of underground water analytical results, by analyzing the main factors of forceful change of underground water for precipitation, underground water exploitation, Yellow River water and canal system layout.(3)The underground water dynamic numerical simulation. According to gynaecological parameters and data calculation of underground water balance, it was negative state of equilibrium from 2001 to 2010. The average annual recharge was less than excretion 314.97 million square meter. It was calculable on the basis of recharge and discharge using Visual MODFLOW underground water numerical simulation.(4)Water levels prediction under different scenarios of underground water.According to different level years of evapotranspiration and precipitation, adjust the exploitation of underground water at the heading canal,the middle canal and the ending canal in irrigation district and the proportion of the Yellow River water, and set different scenarios to forecast underground water level. According to adjustment,and the water level rose in the wet year and the normal year and the back-up water level of the ending canal is the most obvious, water level was reduced to a lesser extent in the dry year. Thus, the set of well and canal ratio effectively alleviated the irrigation mainland underground water depth trend. Meanwhile to a certain extent, it improved the condition of underground water that the depth distribution is uneven.