STUDIES ONTHE INGREDIENTS VARIATION OF THE SAKE-GAWA RIVER, A TRIBUTARY OF THE MOGAMI RIVER

AITA Norio

doi:10.3739/rikusui.33.11

As is usual in the snowy districts, the melting snow in spring causes the rise of river water remarkably. In the Sake-gawa River, a thaw usually begins early in March and continues for about three months.<BR>Judging from the variations of its flow rate, the snow-thawing season is divided into three stages. <BR>Throughout the thawing season, the concentrations of chloride and calcium ions are kept rather high in spite of being in the large flow rate. Different from the ions, the alkalinity is negatively correlated with the logarithm of the flow rate at the same period. <BR>The observations of the concentration of dissolved minerals show that the amount of transportation (Q_d) is proportional to the 'n'th power of the flow rate (Q), i. e. Q_d=aQⁿ, where 'n' are the constants dependent on the ions and the stage of snow thawing. In the case of chloride ion, the value of 'n'is in the following order : the beginning>the middle stage=the end. At the beginning stage, the atmospheric salt in the fallen snow conveyed by the monsoon in winter is transported rapidly in the river water. <BR>As for the calcium ion, the value of 'n' is in the order : the beginning>the end>the middle stage. The total amount of transported chloride ion during the snowthawing season is about a half of the yearly amount. The same is true of the calcium ion.

STUDIES ONTHE INGREDIENTS VARIATION OF THE SAKE-GAWA RIVER, A TRIBUTARY OF THE MOGAMI RIVER

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