The Research on the Effect of the River Flow Condition Change on the Agricultural Water Utilization by the Global Warming

1.在4月的融雪成熟期，大仓坝（宫城县）的总径流深度为371 mm，Touri坝（富山县）为742 mm。温度每升高3 ℃，大仓坝深度减小33mm，土里坝深度减小82mm.大仓大坝的融雪径流量为262毫米，图里大坝的融雪径流量为620毫米。融雪径流量占总径流量的比例平均为70%，土里坝为83%。当温度升高4 ℃时，大仓大坝的平均比率为35%，而图里大坝为45%。这样，就可以证明，如果全球变暖进一步，雪的水坝功能会显著降低。以仙台平原的大仓水坝为研究对象流域之一，尝试观测稻田作物开票时间与农业用水的关系.当仙台气温升高4 ℃时，与广岛和福冈的现状气温基本持平，两者基本一致。5月上旬或4月上旬加速插秧，水稻在成熟期会受到高温伤害。因此，推测如果全球气候变暖的话，宫城县的水稻插秧将在6月上旬进行，10月上旬收获。5.但预计6月是小河流流量最多的时期，同样，融雪径流量也无法预计变暖，面临极度缺水。关于这个问题，有必要作进一步的研究。

1. In April in the snowmelt mature stage, total runoff depth is 371mm at the Okura dam(Miyagi prefecture), and 742mm at the Touri dam(Toyama prefecture). The depth decreases 33mm at the Okura dam, and 82mm at the Touri dam on the temperature 3℃ rise.2. Snowmelt runoff is 262mm at the Okura dam, and 620mm at the Touri dam. And the mean ratio of the snowmelt runoff to the total runoff is 70%, and 83% at the Touri dam. When the temperature increases 4℃, the mean ratio is 35% at the Okura dam, and 45% at the Touri dam. Like this, it was able to be demonstrated the fact that the dam function of the snow remarkably lowered, if the global warming advanced.3. It tried to observe the relationship between rice paddy crop bill time and agricultural water with Okura dam which is one of the research object basin in Sendai Plain.4. It is almost equalized with present temperature of Hiroshima and Fukuoka, when the temperature of Sendai increases 4℃, and it consists. The high temperature injury will be received in the ripening stage, when rice transplanting is done by accelerating May early month or April early month. Therefore, it is guessed with that it does the rice transplanting in Miyagi Prefecture in June early month, if global warming advances, and will harvest it in the October early month.5. However, it is anticipated June that it is the time in which there are most small river flow, and again, that the snowmelt runoff volume can not be expected by the warming either, and that it faces the extreme water shortage. On this problem, further examination is necessary.