Water Management and Operation of Irrigation System in Wide Paddy Area
| Project/Area Number |
60460212
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業土木
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| Research Institution | Faculty of Agriculture, Kyushu University |
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Principal Investigator |
KURODA Masaharu Faculty of Agriculture,Kyushu University, 農学部, 助教授 (50039319)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Tetsuro Faculty of Engineering, Kyushu Kyoritsu University, 工学部, 助教授 (30140627)
NAKANO Yoshisuke Faculty of Agriculture, Kyushu University, 農学部, 助手 (60038320)
TANAKA Akira Faculty of Agriculture, Kyushu University, 農学部, 助手 (70038305)
CHO Tosio Faculty of Agriculture, Kyushu University, 農学部, 教授 (30032048)
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| Project Period (FY) |
1985 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1986: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1985: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | Irrigation System / Water Management / System OperationCreek Network / Water Demand Open channel / Paddy field / 開水路 / 水田 / 溶存酸素 / 広域水利システム / 用水配分 / 栽培管理用水 / 配水管理用水 / 低平地水田 |
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| Research Abstract |
Objective
An irrigation system in a wide and flat area has characteristics such as adjusting functions of water demand, time delays of response in system operation and restrictions of drainage operation afected by tidal actions. The purposes of this research are to clarify actual operations of the system and to get fundamental knowledges for optimizing system operations.
Procedure and Result
1. A water balance method was applied for analyzing actual water management in low lying paddy area with creek network. The ilntake operation of irrigation water in low lying delta area was evidently affected by the drainability of the area due to tidal actions.
2. The dynamic programming method was applied as a technique of simulation and optimization for water management. The water demand in irrigation system is consisted of two components, one is the net duty of water in fields and another is the operation loss in conveyance. The ratio of the operation loss to the water supply is a very useful index of the free use or the limited use of water in fields.
3. Operations of discharge and delay of responses in an open-channel irrigation system were discussed with mathematical analysis and experimental evaluations. The phenomena of response in system operation were transferred to downstream as dynamic, dynamic-kine matic and kinematic waves. A simple and useful equation was derived as a result of solving the linearized diffusion analog model in an effective range.
4. In paddy fields, dissolved oxygen in overlying flooding water is transferred into submerged soil by miscible displacement and diffusion. Mathematical models of miscible displacement and diffusion are used to explain the mechanism of dissolved oxygen in submerged soils.
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Report
(2 results)
Research Products
(5 results)
