非充分灌溉制度设计优化模型

Optimization Model of Designing Non-Sufficient Irrigation Schedules

研究了缺水地区冬小麦灌溉问题。分析了作物模型,作物水分影响函数,并以农作物产量最大为目标,提出了非充分灌溉制度优化设计二维动态规划模型和相应的动态规划逐次逼近(DPSA)求解方法。针对山东省临沂市小埠东灌区的实际情况进行研究,求得了冬小麦三个典型年不同供水水平的最优灌溉制度、排水过程及相应产量。实例表明,模型及方法是合理的。

Irrigation problems of winter wheat in arid regions are studied in this paper. By analyzing the crop model and the crop moisture response function, with the aim of maximum yields, this paper presents a two dimensional dynamic programming model so as to optimize non-sufficient irrigation schedules. A related calculation method of dynamic programming successive approximations (DPSA) has been given. The model has been used to solve practical problems in Xiaobudong irrgation district, Linyi city, Shandong Province. The optimum irrigation schedules, the processes of drainage and the related yields for three typical years with different supply water are obtained. The example shows that the model and the method are reasonable.