Assessment and Preservation of the Agriculural Environmennt System for the Farmland in the Lowland

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(1) On the basic of the person trip survey in Kuroishi district, the rural roads were classified 3 Links and every Links were organized under the rural road network. Close agreement between person trip roots and calculated roots by road network theory was obtained.(2) The paddy areas in Tsugaru Region has historically utilized several types of water utilization. Hirataki District mainly depends on re-used drainage water and rain water stored in ponds and in drainage canals. The inflow and outflow loads of this area is smaller than those of other areas in Japan. Some water management system in Hirosaki District provide an effective case study of future in a time of dwindling water resources and rural environment.(3) Sound characteristics, such as the scoustic power level, the A-weighted sound level in a hydraulic jump type and water cushion type drops were studied in fields.And, ascending of fishes and hydraulic characteristics such as flow condition, distribution of velocity were examined in the step type the fishway of Togo headworks in Iwaki river and the first Hirakawa headworks in Hirakawa river, Mittumenai headworks in Mittumenai river from June till Setember in 1995-1997.(4) 3 models for paddy field with stratified layrs were used. In case of a low drainage, the closed system percolation layrs were low DO,and presented a reducing layr, in which Fe, Mn were detected.However the open system percolation layrs were high DO,and were an oxidation layr, in which Fe, Mn ions couldn't be detected.(5) Changing boundary conditions of imperious layr, these reports are simulated about groundwater level of wetland and agricultural land by 2 dimensional steady flows using F.E.M.