【摘要】 陕西省泾惠渠灌区是一个比较典型的渠井结合灌区。由于该灌区地下水的掠夺式开发利用,使得地下水位总体上呈下降趋势,造成许多环境地质问题。如何合理开发利用地下水,优化配置灌溉水资源,是该渠井结合灌区和谐发展的关键。该研究以Visual Modflow软件为平台,并基于时间序列模型和径向基函数神经网络模型(RBF-ANN),建立了灌区地下水随机-确定动态预测模型,在对灌区水资源供需平衡分析的基础上,通过模型模拟计算,对灌区水资源进行优化配置,为该灌区合理开发利用地下水和灌溉水资源提供依据。更多还原

【Abstract】 Situated in Shaanxi Province of northwest China,the Jinghui Canal Irrigated Area is a typical area irrigated with both pumped groundwater and canal-diverted surface water.The Jinghui Canal Irrigated Area belongs to a continental semiarid climate region with high temperature and relatively plentiful rainfall in summer,and it is cold and arid with high evaporative capacity in winter.In fact,groundwater has been the main water source for most water demands in this area,including agriculture,industry and livelihood.However,water consumption has been dramatically increased with rapid industrial and agricultural development,population growth and sharp reduction of surface runoff inflow,and groundwater is pumped in big volume in most areas.The overdraft of groundwater has caused many problems.On account of irrational groundwater utilization,a continuous drawdown of groundwater level occurs and results in a series of environmental geological problems,such as the cone of depression,subsidence of land and deterioration of water quality.Therefore,it is significant to study how to develop and utilize groundwater resources rationally and how to redistribute irrigating water in an optimized way in the irrigated area.At present,the most urgent challenges for the local government are how to perform the rational redistribution of irrigating water resources and realize the sustainable development of this irrigated area so as to solve the relevant water issues caused by groundwater overexploitation.In recent decades,the researchers at home and abroad have adopted large amounts of methods to study the optimized redistribution of water resources in various irrigated areas in China.However,most of the current studies focus on the numerical solution of optimized redistribution per se,as a result,some significant facts are ignored,such as the impacts of mechanism conditions including geology,hydrogeology and environment in research areas.In order to employ the research results in practice,the Visual Modflow software is used as a platform,and a groundwater stochastic-determination model(GSDM) is developed based on time-series model and radial basis function neural network model(RBF-ANN) to make an intensive analysis of water pattern on a basis of prediction model of groundwater regime for Jinghui Canal Irrigated Area.The results provide a useful and powerful basis for the sustainable development and utilization of groundwater and optimized redistribution of water resources in irrigated areas.更多还原