Study on the Dynamic Evolution Rule of Groundwater in the Xiaokaihe Irrigation District
|School||Shandong Agricultural University|
|Course||Water Resources and Hydropower Engineering|
|Keywords||Xiaokaihe Irrigation District Dynamics of Groundwater Multiple Regression Analysis Ecological Impact|
The shallow groundwater in the area of the Yellow River is mainly affected by the lateral seepage recharge,rainfall,sea instruction and other factors. The salinity of groundwater and water table is big. And it is complexity changeable in different times and places.Irrigated areas not only provides the most important freshwater resources of local, but also communicates the irrigation district as a whole by the irrigation system. It has changed the law of the regional water cycle, and the groundwater irrigation system becomes natural—artificial composite system. By the irrigation district long-term, large-scale water resources development and other human activities, a large number of Yellow River water has changed the region’s natural landscape and underlying surface. And the groundwater systems comes into the evolution of new period influenced by the irrigation system and the strong of water activities.The dynamic characteristics of groundwater is analyzed comprehensively and ystematicly by analyzing the evolution of groundwater before and after the construction of Binzhou Xiaokaihe Irrigation District in the Yellow River delta to determine the key driving factors of groundwater dynamic changes.It is to establish sustainable development irrigation and coordinate with people、water and regional ecological environment.And it plays an important role for the Yellow River Delta economic zone.The main results are as follows:1、Water is short and soil salinization is serious in the Yellow River Delta. The ecosystem is unstable under multiple factors. Irrigation Area as a special area in the Yellow River Delta, it plays an important role in evolution of ecological environment. The water system of irrigation area lives in the heart of the ecosystem for its artificial regulation of water. The evolution and development of the ecosystem are determined by intervention of human factors on water and sand. The complementation between irrigation water System and regional ecological system is the key to sustainable development in the Yellow River Irrigation area.2、The shallow groundwater along the Yellow River remains stable before the construction.The annual changes of groundwater level and annual precipitation are consistent despite large changes in groundwater level in different years.And there is no obvions correlation with the annual runoff of the Yellow River.This is closely related to the stable average annual infiltration and the groundwater discharge of Tuhai River.The changes between shallow groundwater and rainfall remains consistent in the middle of irrigation areas. Shallow groundwater rises in wet years, groundwater stable in average years, and groundwater decreases in significantly dry years. The inter-annual changes of shallow groundwater is big under the control of main conditions as rainfall infiltration and evaporation discharge.3、After construction of the Xiaokaihai irrigation district, shallow groundwater remained relatively stable in upstream region for stable lateral seepage of recharge due to the running of Xiaolangdi Reservoir. In addition, irrigation water less affected the shallow groundwater of the region because of discharge of Tuhai River, water-saving canal lining and water-saving irrigation.Irrigation and other human activities affects obviously groundwater in midstream. Irrigation produce a good effect on groundwater for a reasonable regulation of water resources in irrigated areas.Therefore, it does not appear the sharp decline of shallow groundwater in the dry years. Thus, shallow groundwater couled be stabilized by irrigation regulated and it can effectively t to prevent shallow groundwater rise due to irrigation. In addition, various measures play a good role of preventing water rise and improving the regional water balance.4、Irrigation have a certain impact on regional shallow groundwater, soluble salt in shallow groundwater was driving to a certain degree of redistribution along the dive flows whicn have the same direction of terrain slope in the irrigation area, soil and shallow groundwater salinity occurs the trend of re-distribution——-downstream to the low-lying and irrigated areas together.Most parts of the shallow groundwater in the irrigation area have been improved, in local depressions and downstream irrigation, the water table and groundwater salinity have the tends of rise.5、From the tortuous history of the construction and development in Yellow River Irrigation Area has proven, If you do not take scientific and rational water resources control measures and methods will lead to serious adverse effects on groundwater. But the discovery by studying Xiaokai irrigation, water the fields of science and use reasonable water-saving irrigation methods, not only Shallow water table rise and Soil salinization resulting from irrigation can be avoided ,but also promote the improvement of irrigation water quality of shallow groundwater. Thereby reducing the degree of soil salinity, improve irrigation of the ecological environment.6、Through the use of gray correlation analysis method to determine the correlation of groundwater level effected factors in the typical region—the middle area, discovered that precipitation have the greatest associated with the degree of water table. At the same time, with SPSS statistical analysis software, using multiple regression analysis established a dynamic model of groundwater.7、Yellow River irrigated areas in the local area continues to face issues suc-h as salinity levels increase. Using irrigation water system, to combine water-saveing, regional water control and salt movement, to determine control of salt-based water saving irrigation of farmland ecological scale through further scientific testing, and to determine to maintain regional ecological safety ecological water level of shallow groundwater to maintain ecosystem health and irrigation Irrigation operation mode should be the focus of future research work.