Micrometeorological analysis of interception process taking account of rain-droplet impact on canopy and evaporation due to dispersion
| Project/Area Number |
16560449
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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 | The University of Tokushima |
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Principal Investigator |
HASHINO Michio The Univ.of Tokushima, Dept.of Eng., Professor, 工学部, 教授 (90029231)
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| Co-Investigator(Kenkyū-buntansha) |
TAMURA Takao The Univ.of Tokushima, Dept.of Eng., Research Assistant, 工学部, 助手 (40280466)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Interception evaporation / Multi-layer canopy / Rain-droplet impact on canopy / Evaporation due to dispersion / Aerodynamic Method / Momentum transport process |
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| Research Abstract |
Interception tank models with multilayer canopy are developed in order to separate ranfall interception into water vapor and tiny droplets. Application of the multilayer canopy tank models to observed data of a Japanese cedar (Sugi) in the Okunoi experimental area makes clear that water droplets are produced due to collision and scattering of raindrops on multilayer canopy, and that the water droplets different from water vapor occupy most of raifall interception in heavy storms with 200-400mm.
Furthermore, aerodynamic transport equations for vapor flux and tiny water droplets flux on canopy are obtained based on the aerodynamic theory. Differences between observed interception and estimated aerodynamic vapor transport show that tiny water droplets near on canopy are carried away from canopy by turbulent air motion and become smaller and evaporate into vapor due to spatial differece of humidity. Percentages of remained water droplets on canopy to rainfall interception are estimated 76% and 79% for Japanese cedar (Sugi) and Japanese cypress (Hinoki), respectively. Ratios of the partial pressure of tiny dropletes to the saturated vapor pressure are found to be almost under 2 and vary with the cumulated interception amount.
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Report
(3 results)
Research Products
(11 results)
