Study on irrigation-and-drainage management systems for regional water environmental control

首先，通过对专家的访谈，建立了专家系统模型，该模型包括专家对系统输入的主题区域进行诊断，系统对该区域的未来变化进行估计，并根据从顶层的粗略计划到尾部的详细计划排列的各种项目要素组成的决策树，选择最佳措施来改善估计的未来状态。通过模拟试运行的迭代和专家系统模型的修正，分析了规划专家对灌渠改造工程草案规划的思维过程。其次，从灌溉系统现代化的角度，分析了区域水管理系统的形成过程，并对未来的理想发展进行了探讨。并通过实地调查分析了灌排渠道周边的滨水环境状况，估算了滨水经济价值。对于明渠非定常流场计算，研究了与水工构筑物相对应的四种内部边界条件，以提高内部边界条件下数值的收敛性。并提出了两项有效措施。最后，关于水质，从水库和流入水库的河流中取样了许多瓶水。他们的检验表明，水质水箱模型可以精确地再现这一现象。

First, by interviews on experts, an experts system model was formulated which included processes such as: diagnosis of the subject region input to the system by experts, estimation of the future change in the region by the system, and selection of the best measures to improve the estimated future state following a decision tree made of various project elements arranged from rough plans in the top level to detailed ones in tail level. And planning experts' mind processes were analyzed for irrigation canal reform projects' draft planning by iteration of a simulation test run and model revision of an expert system model.Next, from a viewpoint of modernization in irrigation systems, formation process of regional water management system was analyzed and future desirable development was investigated. And waterfont environmental conditions around irrigation & drainage canals were analyzed through field survey, and economical value of waterfront was estimated.As for the unsteady flow calculation in open channel, four interior boundary conditions corresponding to hydraulic structures were examined to improve numerical convergency at interior boundary conditions. And two effective measures were devised.Finally, concerning to the water quality, many bottles of water were sampled from a reservoir and a river flowing into the reservoir. Their examination showed that water quality tank model can reproduce the phenomena precisely.