Effective water management and control for a large scale irrigation/drainage system

大型灌溉/排水系统的有效水管理和控制

• 批准号: 11460110
• 负责人: KUBO Naritaka
• 金额: $ 6.59万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11460110/
• 关键词: Irrigation and drainage; Water use efficiency; Water management; Unsteady flow; Numerical simulation; Implicit finite difference method

Through four years study by the grant-in-Aid for Scientific Research following results are obtained. (1) About the user-friendly unsteady flow model, we can develop a model based on the implicit finite difference method. We applied the unsteady flow model to the drainage analysis for the Red river Delta in Vietnam, and we can show the effectiveness of the model. We also show that the model can be used as the Tank model for the runoff analysis by combining several interior boundary conditions. (2) About the drainage analysis in a large low-flat area, we selected a floating rice area in the Chao Phraya River Delta in Thailand as the study field. Through the water budget analysis, we examined the retarding capacity of the floating rice area. As the result, we proposed a project to build retarding area by surrounding dykes and to construct regulating reservoirs, and we also showed that the project could solve to some extent two difficult problems of flood during rainy season and drought du … More ring dry season. (3) About the abnormal tidal fluctuation by a construction of a tidal weir in a tidal river, we can solve the phenomena theoretically considering non-linearity of the friction term in the movement equation. As the result, we could show an formula that can calculate approximate amplitude of abnormal fluctuation with regard to the distance from the river mouth. (4) About the flow rate estimation in an irrigation canal by observing water levels, we develop a procedure by use of an unsteady flow model and optimization method. We applied that procedure to the field experiment using Murataka irrigation canal and also to the laboratory experiment by constructing a small-sized model canal. As the result, we verified that the procedure is very effective to estimate flow rate. However, we identified a new problem of treating friction term in case of the very small-scale reduced model experiment. This problem was not solved in this study but should be analyzed in the next step. (5) About the analysis of transient process from one steady state to the other one in an irrigation canal system when hydraulic facilities are controlled, we could solve some phenomena theoretically in some specific conditions. According to the solution, canals can be classified to short and long canals by a representative length obtained through non-dimensional analysis. As the results, we could show that the mechanisms of transient processes are quite different between short and long canals. Namely, in the case of the short canals, the unsteadiness is weakened by waves that go and return, and in the case of the long canals the unsteadiness is weakened by diffusion. Less

通过四年的科研资助研究，取得了以下成果。(1)在非恒定流模型方面，可以采用隐式有限差分法建立非恒定流模型。本文将非恒定流模型应用于越南红河三角洲的排水分析，验证了模型的有效性。通过结合几种不同的内边界条件，该模型可以作为Tank模型用于径流分析。(2)关于大面积低洼地区的排水分析，我们选择了泰国湄南河三角洲的一个漂浮水稻区作为研究区域。通过水量平衡分析，考察了漂浮稻田的滞洪能力。提出了围堤滞洪区和修建调蓄水库的方案，并在一定程度上解决了丰水期和干旱期两大难题。 ...更多信息 环旱季。(3)在感潮河道中修建挡潮堰引起的潮汐异常涨落，考虑到运动方程中摩擦项的非线性，可以从理论上解决这一现象。结果表明，该公式可以近似计算距河口距离的异常波动幅度。(4)针对利用观测水位推求灌溉渠道流量的问题，本文采用非恒定流模型和最优化方法，建立了一套计算灌溉渠道流量的程序。我们应用该程序的现场试验村高灌溉渠道，也通过构建一个小型模型渠的实验室试验。结果表明，该方法对流量估计是非常有效的。然而，我们发现了一个新的问题，处理摩擦项的情况下，非常小规模的简化模型实验。这个问题在本研究中没有解决，但应在下一步进行分析。(5)对水利设施受控制时灌溉渠系从一个稳定状态过渡到另一个稳定状态的过渡过程进行分析，可以从理论上解决某些特定条件下的现象。根据解，通过无量纲分析得到的代表长度，可将管道分为短管道和长管道。结果表明，短渠道和长渠道的过渡过程机制有很大的不同。也就是说，在短运河的情况下，不稳定性被去而复返的波浪所削弱，而在长运河的情况下，不稳定性被扩散所削弱。少

项目成果

R. K. PETER and Naritaka KUBO: "Non-Dimensional Analysis of Steady State Phenomena for the Short and Longer Canals"Proceeding of applied Hydraulics subdivision. H14. 43-54 (2002)

R.K. PETER 和 Naritaka KUBO：“短运河和长运河稳态现象的无量纲分析”应用水力学细分论文集。

Naritaka KUBO, Nguyen CAODON: "Integration of Tank and Unsteady Flow Models"Rural and Environmental Engineering. 39. 25-35 (2000)

Naritaka KUBO、Nguyen CAODON：“水箱和非定常流模型的集成”农村与环境工程。

Naritaka KUBO and Chikayo HOTTA: "Proposal for enhancing flood retarding capacity in the Chao Phraya Delta"Proceeding of the International Conference : The Chao Phraya Delta : Histrical Development, Dynamics and Challenges of Thailand's Rice Bowl. 1. 361-

Naritaka KUBO 和 Chikayo HOTTA：“增强湄南河三角洲防洪能力的提案”国际会议记录：湄南河三角洲：泰国稻米的历史发展、动力和挑战。

Rajendra PETER, one: "Nondimensional Analysis of Sready State Phenomena for the Short and Longer Canals"平成14年度応用水理研究部会講演集. 43-54 (2002)

Rajendra PETER，一：“短运河和长运河的就绪状态现象的无量纲分析”2002 年应用水力学研究小组讲座 43-54 (2002)。

佐々木大 他: "T国B川の防潮水門による異常水位解析並びに被害軽減対策"平成12年度応用水理研究部会講演集. 79-84 (2000)

Dai Sasaki等：“T国B河潮闸造成的异常水位分析和损害减轻措施”2000年应用水力学研究组论文集79-84（2000）。