10 積雪地方森林地からの流出量
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Results of some investigations about the amount of stream-flow from the watershed covered with forest in the deep-snow-district are reported in this article. The amount of stream-flow were measured with the self-recording-tidegauge situated at the Simotakizawa in the College-Forest in the Omyojin village, Iwate prefecture. Meteorological factors were observed near the place. The observations were performed from 1931 to 1942.After investigations the following are obtained.1) The amount of annual precipitation and that of stream-flow are closely related each other. Tth correlation coefficient between the both amounts is 0.71.The mutual relation is shown by the following equation.y=0.71x-246.32 (m.m.)But after observation of the relation between the two (x and y) during seven months from June to November, it is found that the correlation coefficient is 0.91 : that is to say, this is more closely related with the two than the other case. And the mutual relation can be shown by the following equation.y=0.70x-231.81 (m.m.)2) The precipitation which is most closely related to the stream-flow is not always that of the same month but that of the previous month or some other months before. The most closely related ones and the correlation coefficients between the two are as follows. January VIII+IX+X+XI+XII+I 0.681 February XII+I 0.539 March III 0.464 April XII+I+II 0.711 XI+XII+I+II 0.717 May II+III+IV+V 0.902 Jun VI 0.790 July VII 0.965 August 0.944 September IX+X 0.661 October 0.920 November XI 0.941 December VII+VIII+IX+X+XI+XII 0.421 Note : The roman letters denote the months, when the amount of precipitation is observed. The greatest effect of melting snow upon the amount of stream-flow is observed in April, which starts from March to May, and very little in June.They say that they will have plenty water for the irrigation in the coming year when they have much snow in winter, but it is clearly seen that the effect of the melting snow will limited by the end of May ; the season for the rice nursery.The stream-flow is caused by the melting snow by the end of May, so snow conserves the headwater compared with rain.3) About the forecasting of the amount of stream-flow in the snow-melting season. The amount of stream-flow in April is greatly effected by the total amount of precipitation either from November or December to the end of February. The precipitation in April does not amount much. The following equation will formulized between the amount of precipitation from December to February (x) and the amount of stream-flow in April (y).y=0.6x-5.1 The forecasting for the other months is very difficult.
- 日本森林学会の論文
- 1950-02-25
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