吾妻火山大樽川の溶存物質流送作用

概要

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The Ohtaru-gawa River, which starts from Mt. Nishiazuma-san, flows northward joining the Toemon-sawa R. and the Yunoiri-sawa R. in the upper reaches. The stream water is characterized by relatively high concentration of the sulfate, calcium and sodium ions supplied with by the thermal springs gushing from the drainage area. The annual observation of the quality of water reveals that the linear relationship is found to exist between the concentration of calcium ion and that of sulfate ion. Moreover, the discharge (Qd) of every dissolved material such as the ions mentioned above is expressed as an exponential function of stream flow (Q) : Qd=aQ^n, where a and n are constants dependent on. chemical species in solution and n is especially smaller than 0.6 for calcium, sodium and sulfate ions derived from thermal waters. The total annual discharge of dissolved materials is assessed as 3,200 tons, 63% of which comes from the thermal springs.
地理科学学会の論文