Severe Drought after an Absence of 37 Years Illustrated by Photographs and Figures: Comparison of Less Precipitation on Chichi-jima and Haha-jima in the Ogasawara (Bonin) Islands from 2016 to 2017 and Normal Precipitation in 2018
Severe Drought after an Absence of 37 Years Illustrated by Photographs and Figures: Comparison of Less Precipitation on Chichi-jima and Haha-jima in the Ogasawara (Bonin) Islands from 2016 to 2017 and Normal Precipitation in 2018
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用照片和数据说明时隔37年的严重干旱：小笠原群岛父岛和母岛2016年至2017年降水偏少与2018年正常降水的比较
DOI：
10.5026/jgeography.127.823
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发表时间：
2018
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影响因子：
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通讯作者：
H. Matsuyama
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作者：
H. Matsuyama
根据2017年3月和2018年2月进行的实地调查，将2016年至2017年小笠原（小笠原）群岛的千千岛和八片岛的降水量低于平均水平的时期与2018年（正常年份）进行了比较。用水量显示出六天的周期性变化，反映了连接千千岛和东京市中心的海洋船舶小笠原丸的航行时间表。小笠原号抵达千千岛的当天，水的消耗量增加了，因为乘客人数有时相当于千千岛居民人数的30%左右。与秩知岛相比，在2007年至2017年期间，下叶岛的年降水量约为100 mm，沿着，与4月和6月相比，5月的降水量明显增加。此外，八月的八月降雨量是所有月份中最高的。即使在2016年至2017年的严重干旱期间，2016年8月的降水量也高于2007年至2017年的平均水平，恢复了Chibusa大坝储存的水，该大坝为哈哈岛提供饮用水。由于坡叶岛的人均有效蓄水量是秩次岛的1.5倍，这在一定程度上导致了坡叶岛的蓄水量百分比的时间变化总是较大。无论是秩次岛还是哈哈岛，人们都在努力克服严重干旱的困难局面，这反映了当地政府为宣传节水的必要性所做的努力。
A period with less than average precipitation on Chichi-jima and Haha-jima in the Ogasawara (Bonin) Islands between 2016 to 2017 was compared to 2018 (normal year), based on field surveys conducted in March 2017 and February 2018. Water consumption showed a six-day cyclic variation, reflecting the voyage schedule of the marine vessel Ogasawara-maru connecting Chichi-jima and central Tokyo. Water consumption increased on the day Ogasawara-maru arrived at Chichi-jima, because the number of passengers sometimes corresponded to about 30% of number of residents on Chichi-jima. Compared to Chichi-jima, annual precipitation on Haha-jima was about 100 mm greater during the period 2007⊖2017, along with distinctly greater precipitation in May compared to April and June. In addition, precipitation on Haha-jima in August was the highest among all months. Even during a severe drought in 2016⊖2017, precipitation in August 2016 was greater than the average from 2007 to 2017 on Haha-jima, recovering water stored by the Chibusa dam which supplies drinking water on Haha-jima. The effective water storage per capita on Haha-jima is 1.5 times more than that on Chichi-jima, which in some part resulted in the temporal change in the percentage of water storage always being larger on Haha-jima. Both on Chichi-jima and Haha-jima, people tried to overcome the difficult situation of the severe drought, reflecting efforts by the local government to communicate the need to save water.
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