農(nóng)作物水量的智能分配與預(yù)測(cè)研究
[Abstract]:In the course of the development of modern agriculture, the distribution of water resources is uneven and the contradiction between supply and demand is becoming more and more serious. How to develop water-saving agriculture is an important problem to be solved urgently. In addition to adopting relatively advanced irrigation measures such as mature micro-irrigation, sprinkler irrigation and drip irrigation, a reasonable and effective irrigation system should be implemented in the actual agricultural production process, based on the actual water demand of crops. Through the analysis of a large number of related data, the advanced technology is applied to carry out accurate irrigation, so as to improve the efficiency of irrigation and the utilization rate of water. How to reasonably and effectively irrigate crops on the basis of existing water resources is of great practical significance. Based on a large amount of data analysis, intelligent irrigation has changed the blindness and arbitrariness in the process of irrigation of water resources in the past, which can reduce the management cost and increase the economic benefit. Based on the practical background of the agricultural Internet of things and the optimal scheduling and forecasting of different crop water resources, this paper mainly carried out the following work: (1) aiming at the shortcomings of the traditional immune optimization algorithm, by adding the local search operator, The traditional immune optimization algorithm is improved, and in order to speed up the population iteration and prevent the algorithm from missing the optimal antibody solution in the iterative process, the initial population is divided into two sub-populations for parallel search. (2) based on the different growth cycles of corn and wheat in real farmland, when the water supply is sufficient, The advantages of the improved immune optimization algorithm compared with the original immune optimization algorithm are verified. At the same time, under the condition of inadequate irrigation, through the improved immune optimization algorithm, the water allocation of two crops with different growth cycles is coordinated. The total yield of the two crops is maximized. (3) in view of the unreasonable and wasteful distribution of water resources in the process of irrigation, combining with the data provided by the official website of Shanghai Agricultural Commission, the least square support vector machine is used as the basis. For the traditional selection of two important parameters C and C of support vector machine based on empirical data, the prediction may not be accurate enough. In this paper, the improved particle swarm optimization algorithm and the immune optimization algorithm are applied to the parameter optimization of the least squares support vector machine, and a new support vector machine model is formed. (4) based on the agricultural data collected, The support vector machine (SVM) model is used to predict the water demand of crops at a certain time through the interaction of various factors affecting crop water demand. By comparing two kinds of intelligent algorithms, the function of the improved immune optimization algorithm and the improved particle swarm optimization algorithm in parameter optimization is verified. At the same time, the advantage of the improved immune optimization algorithm is proved to be better than that of the particle swarm optimization algorithm. These can provide certain theoretical guidance for the subsequent crop water-saving irrigation. Finally, the content of the paper is summarized and the future research content is prospected.
【學(xué)位授予單位】:東華大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S27;TP18
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