畦灌田面行水流动的模型与模拟

根据我国地面灌现状提出极限灌水状态和最佳灌水状态及其灌水技术参数的概念。用NewtonRaphson法和Preissman法求解畦灌田面行水流动的零惯性模型，实现了畦灌田面行水流动的模拟。在此基础上探讨畦灌的行水和入渗机理。用计算机模拟试验方法建立极限灌水定额与灌溉技术参数和畦田规格关系的数学模型，并研究它们对极限灌水定额的影响，进而探讨了灌溉技术参数和畦田规格对灌溉系统性能的影响。提出了适宜畦长和单宽流量的确定方法并给出了其量值。

Study on Model and Simulation of Border Irrigation and Its Application

The concept of optimal irrigation and the zero-inertia models for border irrigation are suggested. The models are solved with the method of Newton-Raphson and Preissmain,and surface-water flow in the field is simulated. The mechanisms of infiltration and advance are verified. The effect of the technique parameters on the performance of irrigation is studied. The fundamental rule and method of determining the technique parameters is put forward and a progtam for determining parameters and irrigation performance is developed. The results of simulation are verified by field irrigation experiments.