Research On The Numerical Simulation Of Groundwater Level In Jinghuiqu Irrigation Area

Water resources, as an essential part of human life, plays an important role in thedevelopment and progress of human beings, in the early time, tribal clan has started tobuild in accordance with water. As an important component of water resources，groundwaterplays an important role in promoting healthy and harmonious development of society andeconomy, and maintaining the balance of ecological environment. However, due to thepredatory exploitation and utilization of groundwater in our country especially the northernpart, the problems which have been led up to by this phenomenon have been evident and theprotection condition is very severe. Therefore, it has an important significance for thesustainable use of water resources and for overall control of "Sanshui" to carry out researchand practice such as about the groundwater.Shanxi province is in the northwest part of our country, it is one of the importantbirthplace of Chinese civilization. Guanzhong area, which is Weihe plain, is the richest areain Shanxi province from long time ago. Jinghuiqu irrigation area is located in it which isalso the object of this study. As a historic irrigation project, Jinghuiqu irrigation area haschanged into a drainage well combined with multiple water irrigation systems from a singlechannel irrigation. It made a great contribution to the security of the regional foodproduction and the rapid economic development. Its joint use of surface water andgroundwater is a good example for the utilization of water resources in China’s large-scaleirrigation districts.This paper relied on the public welfare industry special funds project of the Ministry ofwater resources, which is "the research of irrigation and well configuration standards andcontrol technology in well and canal two-irrigation district in northwest area of our country",to do some research on water resources of Jinghuiqu irrigation area, especially thegroundwater resources. At first, do the water balance analysis of Jinghuiqu groundwaterresources according to the data of these ten years recently, select2006and2001are50%and75%level respectively,2012is the present year. The result indicates that the averagenumber of Jinghuiqu groundwater exploitation is187.6million cubic meters in theory, but the actual number in these10years recently is larger than that, it reached240million,which is far more than the theoretically number, so some strict control of the groundwaterexploitation quantity should be done to ensure the rational use of water resources. Therefore,according to the hydrology and meteorology data of these30years recently, this paper doessome research of the influence factors about irrigation area’s groundwater dynamic analysis,and also find the main factors and secondary factors among the numerous factors using thePCA(principal component analysis).This finding can do a good help to indicate thedirection and reduce the workload of the irrigation groundwater’s research. At last, use theVisual Modflow software to build the numerical model according to the data of30yearsrecently, and then predict the groundwater level changing condition in the future15yearsdepending on the model, point out that the groundwater level will continue to decrease, onlysome difference of the falling rate between upstream、 midstream、 downstream.Consequence will be very serious without any control, some groundwater funnels arealready appeared and will continue to increase the water level difference in some areas,ground fracturing、collapses and some other geological disasters will happen in some localareas, so more attempts should be done to control the utilization of groundwater and buildthe joint management system of the surface water and groundwater, to carry out thesustainable use of irrigation area’s water resources.