Study on Effects of Roughness Patterns on Turbulent Structure though Field Measurements

现场测量研究粗糙度模式对湍流结构的影响

基本信息

批准号：
03650418
负责人：
TSUJIMOTO Tetsuro
金额：
$ 1.02万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650418/
关键词：
Field Measurements Turbulent Structure Roughness Turbulence Model Flow with Vegetation Gravel-Bed Flow Transient Process Reynolds Stress 野外観測乱流開水路流流連分布

项目摘要

Because of recent wide purpose of river improvements, we should know more about the flow structure with various patterns of roughness. In fact, river improvement in mountain regions needs the knowledge on the flow with small relative submergence. For designing various types of structures in rivers, the flow must experience various patterns of spatial change of roughness, and thus the transient process of turbulent flow for spatial change of roughness should be studied. The river improvement with special respect with environments, the flow with vegetation should be accurately evaluated.In this research project, the approach based on theoretical analysis and fundamental experiments in laboratories was coupled with field measurements of turbulence. Recent development of anemometers and data-recording and processing system have made field measurements comparatively easy. We have developed the system of field measurements of turbulence with aid of electromagnetic anemometers, and carefully selected the measuring sites in rivers or irrigation canals. The flow with small relative submergence, hekicoidal fluid motion of flow over skew arrangement of strip roughness, the flow over vegetation, the flow with spatial change of bed roughness, the flow with vegetation zone in a cross section have been selected and the measurements in fields and in laboratories have been compared to confirm the similarity of the turbulent phenomena. With valuable data obtained in fields and laboratories, the effects of roughness patterns in open-channel flows have been investigated through data analyses and comparison of the data with laboratory data and the results of analytical or numerical approaches.

由于河流改善的最新目的，我们应该更多地了解具有各种粗糙度模式的流动结构。实际上，山区的河流改善需要对流量的相对淹没的知识。为了设计河流中各种类型的结构，必须研究各种粗糙度的空间变化模式，因此应研究湍流的瞬时过程，以进行粗糙度的空间变化。应对环境的特殊尊重，应准确评估河流的改善。在这项研究项目中，基于理论分析的方法和实验室中的基本实验与湍流的现场测量相结合。最新开发的动态计和数据录制和处理系统使现场测量相对容易。我们已经借助电磁磁力仪开发了湍流的现场测量系统，并精心选择了河流或灌溉管中的测量位点。流动流动的流动，悬浮在条状粗糙度上，植被上流的流动，植被的流动，床粗糙度的空间变化，植被区域中的流动横截面的流动，并在实验室中进行了测量以确认湍流现象的相似性。借助在田野和实验室中获得的有价值的数据，已经通过数据分析和数据与实验室数据进行比较以及分析或数值方法的结果研究了开放通道流中粗糙度模式的影响。