1997 Fiscal Year Final Research Report Summary
Rainmaking in Seashore Desert
| Project/Area Number |
07808064
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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 |
環境保全
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| Research Institution | Kanazawa Institute of Technology |
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Principal Investigator |
YANAGISHITA Kazuo Kanazawa Institute of Technology, Department of Technology, Professor, 工学部, 教授 (20239809)
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| Co-Investigator(Kenkyū-buntansha) |
WAKABAYASHI Hiroaki Kanazawa Institute of Technology, Department of Technology, Professor, 工学部, 教授 (90011056)
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| Project Period (FY) |
1995 – 1997
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| Keywords | Artificial Rain / Desert Greening / Technology Assessment / Solar Energy Utilization / Seashore Desert / Fixing Carbon Dioxide / Water Resouces / Halophyte |
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| Research Abstract |
The aim of this research is to make rain in a desert near sea. There is no cloud in desert area, therefore, seeding by dry ice or silver iodine is not possible. Our idea is to make cloud by accelerating evaporation of sea water, by putting black material on the surface of the sea. It absorbes solar energy 100% on the sea surface, without reflecting it back to the space nor penetrating into deep the sea. The sea surface becomes very hot and evaporation is increased. The evaporated moisture must be moved onto the desert, otherwise, it falls down into the sea at night. Putting black material on desert surface, solar energy absoption is increased compared with no black material exists. It absorbes solar energy 100% and the desert surface becomes hotter than without the black material. Then air on the surface becomes hot and expands and becomes lighter and goes up and the area becomes of low pressure. The moisture on the sea surface is of high pressure and moves to low pressure area on the desert, and moves upward, being pulled by the upward air stream. In the high sky, the noisture is cooled by adiabatic expansion and make cloud and rain. Several materials were tested outdoors and in the dark room experiments, and 28-41% increase of evapopration was observed. Soler reflection by several kinds of desert sand were measured to be 30-70%, with means absorption by 1.5-3times is expected, although higher absoption does not gurantee rain fall. The longest distance between black area on the sea and the black area on the desert was not defined yet at this stage of the research.
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