Fundamental Studies on the Elements of Water Consumption in Paddy Field : I. Consideration of the Summer Drought Days in Kyushu Region

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  • Nomura Yasuji
    Faculty of Agriculture of Tottori University
  • Tanabe Kunimi
    Laboratory of Irrigation Engineering, Faculty of Agriculture, Kyushu University

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Other Title
  • 水稲田の用水消費要素に関する基礎的研究 : I. 九州地方の夏期干天日数に関する考察
  • 水稲田の用水消費要素に関する基礎的研究-1-九州地方の夏期干天日数に関する考察
  • スイトウデン ノ ヨウスイ ショウヒ ヨウソ ニ カンスル キソテキ ケンキュウ 1 キュウシュウ チホウ ノ カキ カンテン ニッスウ ニ カンスル コウサツ

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Abstract

Many studies on precipitation have been hitherto made in order to contribute the rationalization of irrigation planning. However, the data, such as the return period of drought days, are necessary one of the basic information for such planning. From this point of view, this paper deals with regional characteristics of drought days, maximum drought days and monthly precipitation during summer season (June to Aug.) in Kyushu in order to obtain useful information for irrigation planning. The outlines of the results obtained are as follows: (1) By analyzing the frequency distribution of drought days during summer season at fifty-six places in Kyushu, it was found that the distribution curve is normalized if the variable transformed into square or cubic root. (2) The coefficient of probable drought days curve (Table 3) and the return period (1/10-100 year) of drought days (Table 4) are obtained. (3) For practical use, geographical distribution maps are drawn for thirteen kinds of return period (Fig. 8-1～13). (4) The return period of maximum drought days and monthly precipitation, at eight places, are shown in (Table 8) and (Table 10). (5) It was suggested from the above results that it keeps on drying for a long term in the northern part of Kyushu to be subjected to the damage from a disastrous drought. Therefore, much care should be taken on determination of the irrigation water supply.

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