微灌系统随机规划数学模型研究
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摘要
本文针对微灌工程规划设计中的问题,在分析常规微灌系统规划设计方法的基础上,采用随机规划的数学方法,对微灌系统管网进行了优化设计。论文采用理论分析与工程实例相结合的研究方法,建立了微灌系统随机非线性规划数学模型。
     论文首先分析了常规微灌系统规划设计方法,在此基础上,以年费用或投资最小为目标,用离散管径方法,以管段长度和水泵扬程为决策变量,分别建立了水泵加压式和自压式干管管网优化设计以及田间管网优化设计线性规划模型。通常情况下,微灌系统规划设计都采用轮灌的工作制度,即按照设计的轮灌组划片限灌。这种供水方法而不考虑片内作物分布和作物品种差异对需水的要求及土壤的实际含水量。论文针对这种灌溉制度的缺点,引入管网流量设计保证率、概率约束等理论,用概率论的方法推求了随机灌水条件下管网设计流量的计算公式,并建立了随机取水条件下微灌系统管网优化设计随机非线性规划数学模型。论文分析了管网优化设计随机非线性规划数学模型的求解方法,并编写了相应的电算程序。最后将随机规划模型和确定性线性规划模型分别应用于江苏省海门市常乐镇微灌工程规划设计中的大棚滴灌系统,对管网系统进行了优化设计,并将其结果进行了比较分析。
On the basis of analyzing the usual problems in the design of micro-irrigation, network for micro-irrigation is optimize designed. By the method of combining analysing the theories and the engineering examples and of stochastic programming,the network for micro-irrigation is optimize designed,and the stochatic non-linear programming model of micro-irrigation system is built.
    On the base of analysing the ordinary design methods,aiming to the minimum annual cost or investment, taking the pipe length and water pump lift as decision-making variables, the linear programming models are presented to optimize the diameters of main network and field network. In usual condition , the work system of alternation irrigation is adopted in the micro-irrigation system design. That is the farmers have no choice but to irrigating by turns. And they can't take into account distributing of crops and water requirement and water content of soil. Aiming at the limitations of this irrigation system , a expressions about design flow of pipe networks is set up by the probability methods. A model of stochastic non-linear programming by random irrigating is presented to optimize network of micro-irrigation. And the answer to optimum design of network is analysed about a model of stochastic non -linear programming and FORTRAN program is compiled accordingly . At last, the stochastic model and the linear programming are both applied to optimum design of drip-irrigation project for Jiangsu Province Haimen city Changle town.Then the results are compared and analysed .
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