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No.22 (1976/09) >

 
Title :西表島の主要四河川と高那及び古見地域における天然水の化学的調査
Title alternative :Geochemical investigation of the main river waters and other natural waters on IRIOMOTE Isl.
Authors :兼島, 清
渡久山, 章
Authors alternative :Kaneshima, Kiyoshi
Tokushi, Akiraa
Issue Date :Sep-1976
Abstract :Geochemical studies were conducted on natural waters in TAKANA and KOMI regions and the main four rivers in IRIOMOTE Isl. Sampling was conducted in Septemer 1970 at TAKANA and KOMI regions and the Nakama river, and in September 1971 at the Urauchi, Kuira and Nakara river. 1) Acidic natural weter in TAKANA region were reported at the newspaper as "hot springs." However, the authers concluded that waters are not hot springs, for the fluxes are little and the water temperature is low (28℃). 2) Gregariousness of Mangrove is seen from the river mouth to an upperstream about 6 Km at the Urauchi river to about 5 Km at the Nakama river, to about 4.5 Km at the Nakara river and to about 4 Km at the Kuira river and the Cl concentrations at the limitting points of Mangrove are respectively 1/6, 1/5, 1/3 and 1/2 of sea water at the Urauhi, Nakama, Nakara and Kuira river. However the range of salinity is not constant, salinity may be one of important factors for growth of Mangrove. 3) Chemical ompositions (Ca and HCO_3) of land waters are grouped to different patterns at each river. That different chemical patterns reflect diffrent natural envirom,emts at each river.
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/23627
Citation :球大学理工学部紀要. 理学編 = Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences no.22 p.15 -32
Appears in Collections:No.22 (1976/09)

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