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No.25 (1978/03) >

Title :沖縄本島における雨とDry Falloutの化学的研究
Title alternative :The Chemical Studies of Rain and Dry Fallout in OKINAWA HONTO
Authors :渡久山, 章
伊良部, 正昭
Authors alternative :Tokuyama, Akira
Irabu, Masaaki
Issue Date :Mar-1978
Abstract :In OKINAWA HONTO, the Cl^- concentrations of river and spring waters are 20-50 ppm. What mechanisms are considered to supply these Cl^- concentrations? To explain these Cl^- concentrations, the authors have collected rain and dry fallout by two methods. One of these is a bucket method and other is a wall method. The Cl^- quantities supplied by bucket method are calculated to be 10 to 17 mg per liter, and by wall method, if the sampling areas are same, about 80 per cent of quantities gathered by bucket method will be gathered. Considering the factors of chemical materials transportation among sea, air and lands, the typoon must be picked up at first in this island. For example, Cl^- quantities descended to land in the time of the typoon 17 th in 1976 was over 100 times in the usually sky. The Cl^- quantities descended are deduced with the distance from the sea, but the inverse proportion of the first degree are not between Cl^- quantities and the distance from the sea. The total quantities of dissolved materials descended per year to OKINAWA HONTO are calculated to be over ten thousands tons. The origin of chemical species (Na^+, K^+, Ca^<2+>, Mg^<2+>,SO^<2->_4) in rain and dry fallout is considered to be the only sea, but in the river and spring waters, excess quantities which are calculated based on the chemical composition of sea water are dissolved for these chemical species.
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/24076
Citation :琉球大学理工学部紀要. 理学編 = Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences no.25 p.17 -32
Appears in Collections:No.25 (1978/03)

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