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首页> 外文期刊>Hydrology Research >Assessment of drought across central Sudan using UNEP dryness ratio
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Assessment of drought across central Sudan using UNEP dryness ratio

机译：使用环境署干旱率评估苏丹中部的干旱

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摘要

The objective of this paper is to improve our perception of drought in central Sudan. This hasnbeen realized by detailing the changes that occurred in the dryness ratio (rainfall/potentialnevapotranspiration) of the United Nations Environment Programme (UNEP) during the periodn1941–2005. Eight representative stations of the area were selected and their dryness ratiosnexamined on annual and monthly bases. A trend towards intensifying and more recurrent droughtnhas been found. This trend is particularly significant in the arid areas. Statistically significantnincrease in areal coverage of drought has occurred. Substantial changes took place in thenseverity and frequency of drought between 1941–1970 and 1971–2005 over the whole area.nMoreover, the early to mid-1970s, mid-1980s, early 1990s and early 2000s were determined asncommon drought years and were among the driest 10 years. The analysis also revealed high andngenerally increasing inter-annual variability of the dryness ratio. There is not a dominantnshort-term persistence in the data, as assessed by the lag-one serial correlation coefficient. Earlynforecast of the moisture condition during the rest of the season could merely be accomplished atnsmall scale in the area. These results indicate that drought in the study area is irregular.
机译：本文的目的是改善我们对苏丹中部干旱的认识。通过详细描述1941-2005年期间联合国环境规划署（环境署）的干旱比率（降雨/潜在蒸散量）发生的变化，尚未意识到这一点。选择了该地区的八个代表性站点，并以年和月为基准对它们的干燥率进行了检测。已经发现干旱加剧和更频繁的趋势。这种趋势在干旱地区尤为明显。在统计上，干旱地区的覆盖面有所增加。在整个地区，1941年至1970年至1971年至2005年期间，干旱的严重程度和发生频率发生了重大变化。此外，1970年代初至1970年代中期，1980年代中期，1990年代初和2000年代初被确定为干旱的常见年份，并且属于干旱年。最干燥的10年。分析还表明，干燥率的年际变化较大。通过滞后一序列相关系数评估，数据中没有显性短期持久性。只能在该区域的小范围内完成季节剩余时间内的湿度预报。这些结果表明研究区域的干旱是不规则的。

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  • 来源
    《Hydrology Research》 |2009年第5期|p.1-14|共14页
  • 作者

    Elagib Nadir Ahmed;

  • 作者单位

    Nadir Ahmed Elagib (corresponding author)College of Water and EnvironmentalEngineering,Sudan University of Science and Technology,P.O. Box 352,13311 Khartoum North,SudanE-mail: elagib@hotmail.com;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    arid and semi-arid zones, drought, Sudan, UNEP dryness ratio;

    机译：干旱和半干旱地区;干旱;苏丹;环境署干旱率;

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