| Project/Area Number |
09650562
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | NAGAOKA UNIVERSITY OF TECHNOLOGY |
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Principal Investigator |
HAYAKAWA Norio Nagaoka University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (70143815)
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| Co-Investigator(Kenkyū-buntansha) |
ASANUMA Jun Nagaoka University of Technology, Faculty of Engineering, Lecturer, 工学部, 講師 (40293261)
陸 旻皎 地球フロンティア研究システム, 研究員 (80240406)
LU Minjiao Frontier Research System for Global Change, Researcher
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | surface boundary layer / turbulent transport / distributed hydrological model / heat transport / snowmelt analysis / snowfall / snow covered area / temperature llapse rate / remote sensing / 境界層 / 分布型水文モデル / 水・熱フラックス / GIS |
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| Research Abstract |
The distributed hydrological model, with an operational version becoming available, bears a possibility of offering a very high-aceuracy high-resolution model with the combined use of the satellite remote sensing data or radar data. The problem in the development of a high-grade runoff model is the lack of knowledge of the turbulent transport in the surface boundary layer and its role on the hydrological processes. This study attempts to conduct a preliminary study on incorporating the mechanics of the surface boundary layer into the distributed hydrological model and developmental study of the distributed model to the snowfall-to-snowmelt season.
At the first stage of this study the field observation of the turbulent fluctuation of the wind and temperature is carried out with the turbulent meters mounted on the craned vehicle. The result shows the turbulent characteristics of the wind and temperature and turbulent transport of momentum and heat is obtained.
As for the developmental stud
… More
y of the distributed hydrological model, the application to the snowfall-to snowmelt season is attempted, as the surface boundary layer mechanics is crucial in this season. In attempting to include the snowfall and snowmelt phenomena, the snowfall amount is estimated from the precipitation data assuming the catch ratio of the rain gage and the altitudinal dependence of the snowfall. Snowmelt amount is calculated by the heat flux method.
The model is first applied to the Uono River basin where the satellite remote sensing data is available. From the satellite data the snow covered area in the basin is extracted and this data offer the possibility of reproducing the snow covered area with the runoff model. For the second application the Upper Tone River basin is chosen, ln this case, temperature distribution in the basin, which is inputted to the snowmelt calculation, evaporation calculation as well as the parameter to decide snowfall, is decided from the data-obtained lapse rate. The calculation result shows agreement with the runoff discharge at not only the basin outlet but also gauged points within the basin. Temperature lapse rate thus is shown to be an important parameter which is essentially the meteorological parameter that has to be determined through the analysis of the surface boundary layer. Less
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