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Basic and Practical Research on Flow Control in Open Channel Networks with Various Hydraulic Structures.

各种水工建筑物明渠网流量控制的基础与实用研究。

基本信息

批准号：
07650605
负责人：
WATANABE Kunitoshi
金额：
$ 1.28万
依托单位：
Saga University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

1.Investigation of Open Channel Network Systems in Saga CityThe data for 26 channels with 26,661m long in total in Saga City area was collected. Wires, contractions, gates, culverts and steps in the network systems of this area were also investigated.2.Developments of Numerical Model and Computer ProgramNumerical model for unsteady flow in channel networks has been developed by using Branch-Node Model based on the graph theory. Using this model, the computer program for hydraulic analysis of channel network systems with various hydraulic constructions has been also developed. This program can treat the blind channel which does not make the circuit, the dry up channel and the reservoir with pump.3.Flow Characteristics and Improvement Plan of Open Channel Networks in Saga City(1) Flow of channel networks in Saga City was simulated under the condition of measured discharge, 1.12m^3/sec. The networks is divided into two parts, east and west networks. Two parts are connected by only one channel. The inflow rate to the east networks is slightly 16% of total one from the outside of system. This results in the stagnation and the dry up of flow. That is, the number of branches where the flow velocity exceeds 25cm/sec is slightly 13% of total number of branches. Moreover, branches with velocity under 10cm/sec is about 40% and branches with depth under 5cm is about 30%. The present flow situation has been perfectly simulated and grasped in detail.(2) The 60% of the additional amount of flow for improvement of the flow situation in the east networks flows into the west networks. The number of branches with velocity above 25cm/sec has increased to 50% by the flow control by a weir. It has been clarified that the most suitable inflow into this open channel networks is 4.0-5.0m^3/sec.

1.佐贺市明渠网系统调查收集了佐贺市26条总长度为26，661 m的明渠资料。对该地区河网系统中的导线、收缩、闸门、涵洞、台阶等进行了研究。2.数值模型和计算机程序的开发利用图论中的枝-节模型建立了河网非恒定流的数值模型。利用该模型，还编制了适用于各种水工建筑物的渠网系统水力分析的计算机程序。该程序可以处理不成回路的盲渠、干涸渠和有泵水库。3.佐贺市明渠水流特性及改善方案（1）在实测流量1.12 m^3/s的条件下，模拟了佐贺市明渠水流。网络分为两部分，东，西网络。两个部分仅通过一个通道连接。东部网络的流入率略占系统外部总流入率的16%。这导致流动的停滞和干涸。也就是说，流速超过25 cm/sec的分支的数量略占分支总数的13%。流速在10 cm/sec以下的树枝约占40%，深度在5cm以下的树枝约占30%。对水流现状进行了较好的模拟和详细的掌握。(2)东部管网改善流量状况的新增流量的60%流入西部管网。通过堰流控制，流速大于25 cm/s的枝数增加到50%。研究表明，该明渠网最适宜的入流流量为4.0-5.0m^3/s。