Evaluation of recent drought conditions by standardized precipitation index and potential evapotranspiration over Indonesia
Evaluation of recent drought conditions by standardized precipitation index and potential evapotranspiration over Indonesia
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DOI：
10.1007/s10333-019-00728-z
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发表时间：
2019-07
影响因子：
2.2
通讯作者：
Y. Pramudya;Takeo Onishi;M. Senge;Keiichi Hiramatsu;Prasetyo M. R. Nur
中科院分区：
文献类型：
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作者：
Y. Pramudya;Takeo Onishi;M. Senge;Keiichi Hiramatsu;Prasetyo M. R. Nur
在南亚，人口增加和干旱频繁是严重影响该区域缺水的重要因素。在这项研究中，最近的干旱状况进行了评估，通过计算1991-2006年期间的标准化降水指数（SPI），根据过去的数据在1961年至1990年期间。此外，Thornthwaite方程用于计算印度尼西亚整个地区的月潜在蒸散量。APHRODITE数据集用于降水和温度。利用1961-1990年4 - 9月的月降雨量资料，得到了计算SPI值的伽玛函数。1991年至2006年期间SPI值<-2的计算概率用于评估印度尼西亚最近的干旱状况。关于潜在的土壤水分亏缺，在非常简单的假设下，即根区为30 cm，土壤孔隙度为0.4，田间持水量为土壤孔隙度的80%，土壤水分亏缺的临界阈值设定为− 96 mm。在1991-2006年期间，计算了小于-96毫米的潜在缺水频率。印度尼西亚的SPI结果表明，印度尼西亚大部分地区在1991-2006年期间遭遇了严重和极端干旱。根据SPI的解释，婆罗洲岛和西巴布亚岛是旱季遭遇最严重干旱的岛屿。婆罗洲岛似乎在旱季的开始和中期（4月，5月和7月）遇到了极端干旱。另一方面，根据Thornthwaite的解释，爪哇和巴厘岛，特别是中爪哇和东爪哇，似乎遇到了最大的土壤水分赤字在中期和年底的旱季（5月，6月，7月和9月）。
In South Asia, an increasing population and frequent droughts have been significant factors deeply affecting water deficits in the region. In this study, recent drought conditions were evaluated by calculating the standardized precipitation index (SPI) for the period of 1991–2006, based on past data during the period from 1961 to 1990. In addition, the Thornthwaite equation was used to compute monthly potential evapotranspiration for the entire area of Indonesia. The APHRODITE data set was utilized for precipitation and temperature. Monthly rainfall data from April to September for 30 years (1961–1990) were used to obtain the gamma function for the computation of SPI values. Calculated probability of SPI for which values were < − 2 during the period from 1991 to 2006 was used to evaluate recent Indonesian drought conditions. Regarding potential soil water deficits, under the very simple assumption that the root zone is 30 cm, soil porosity is 0.4, and field capacity is 80% of soil porosity, the critical threshold of soil water deficit was set as − 96 mm. Frequency of potential water deficits < − 96 mm was counted during 1991–2006. The results of the SPI in Indonesia indicate that most parts of Indonesia have encountered severe and extreme drought for the period 1991–2006. Based on SPI interpretation, Borneo Island and West Papua are the islands that encountered the most extreme drought during the dry seasons. Borneo Island seems to have encountered extreme drought at the beginning and the middle of the dry seasons (April, May, and July). On the other hand, based on the Thornthwaite interpretation, Java and Bali Islands, and especially in Central Java and East Java, seem to have encountered the greatest soil water deficit at the middle and the end of the dry seasons (May, June, July, and September).