岡山県の水収支に関する水文気候学的研究

概要

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In Okayama Prefecture, which is one of the districts with the smallest precipitation in Japan, there have been many water reservoirs (ponds or tanks, TAMEIKE in Japanese) and many mountains, so-called Ryuozans, where the people has prayed for rain. At first, we calculated the climatological water balance by using Thiessen Method and Thornthwaite Formular and made its geographical distribution maps in Okayama Prefecture including some boundary areas of Hiroshima, Tottori and Hyogo Prefectures. Any contour lines of water balance are generally running from west to east, but it is locally noted that the contour lines are slightly fluctuating to meridional direction. It seems to have some connection with main three big rivers in Okayama Prefecture, the Yoshii, Asahi and Takahashi Rivers. In order to clarify the features of three drainage basins, we analized the annual variation patterns of water balances, the run-off and its coefficience, and the relationship between peak run-off and flood. As the results of comparing with each other, it is certainly that the Asahi River has the greatest water-hold capacity not only because of the largest run-off coefficience but also because of comparatively poor forest. From the view-point of water balance, each drainage basin can be divided into three regions.
地理科学学会の論文