Renewable Hydraulic Design for Systematic Maintenance and Landscape

优化灌溉系统的第一个目标是寻找既依赖水力分析又依赖适当维护的技术，同时考虑到最近的农业情况。(1)：1989.12.20-22，山形市周边、莫上河流域和仙奈河流域(2)：1990.7.29-31，通心河上游山区和中游流域(3)：1991.10.2-4，丰川供水利用系统1。水库水质控制：N.Rubo分析了水库中沙粒和粉粒的运动。G.Ohashi通过实验研究了感潮河流模型中的分层流动和界面波，以及Hiji感潮河流中的咸水锋。K.Mori&O Katoh通过大量实验研究了密度界面的夹带率和风致水流引起的盐分从底部到表面的运移。取水口工程的改进：T.Yamamoto和Y.Akiyoshi对小型给水系统中与急流形态有关的取水口方法进行了研究，得出了有益的设计技术。Miwa和N.Kawagoshi对闸下或闸下冲沙进行了调查，并对如何防止人工疏浚的河床拦河坝周围泥沙淤积的考虑进行了调查。航道环境控制措施：F.Matsushita和K.Maekawa对溢流、下沉和校核结构和控制方法引起的噪声特性进行了调查。M.Tanaka和H.Iagaki研究了敞开式管道涌浪的控制方法以及图像处理在消力池水工模型试验中的应用。

The first aim for the optimum irrigation system is to seek for techniques depended on both hydraulic analysis and suitable maintenance taking account of recent farming situations. The second one is, as things as, to keep reasonable harmony between rural green space and artificial irrigation system.Many fresh knowledge and active farming recognition by following field inspections :(1) : 1989.12.20-22, Around Yamagata City, the Mogami River and Syonai Basin(2) : 1990.7.29-31, Upper mountainous area and middle basin along the Tone River(3) : 1991.10.2-4, Toyokawa Water Supply and Utilization System1. Control for Water Quality in Reservoir : N. Rubo had analyzed the movement of sand and silt-like particles in a reservoir. G. Ohashi studied on stratified flow and interfacial wave in tidal river model experimentally and on salt water fronts in the Hiji tidal river.K. Mori & O. Katoh studied on both the entrainment rate of density interface and salt transport from bottom to surface due to a wind-induced current by many experiments.2. Improvement of Intake Works : T. Yamamoto and Y. Akiyoshi studied on the intake methods related to morphology of torrents in small scale water supply system and get useful design techniques. H. Miwa & N. Kawagoshi investigated on both flushing sand under gates or sluice outlet and on the consideration how to prevent sand deposition around barrages on river beds dredged artificially.3. Measures for Channel Circumstance Control : F. Matsushita and K. Maekawa investigated on both the noise characteristics caused by the flow over, drop down and check structures and control method. M. Tanaka and H. Itagaki studied on control method for surging of open-type pipeline and an application of image processing to hydraulic model test of stilling basin.Results about recent farming situations are gathered in the report at Part I.