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首页> 外文期刊>Journal of Hydroinformatics >Temporal and spatial characteristics of precipitation and droughts in the upper reaches of the Yangtze river basin (China) in recent five decades
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Temporal and spatial characteristics of precipitation and droughts in the upper reaches of the Yangtze river basin (China) in recent five decades

机译：近五年来长江流域上游（中国）降水和干旱的时空特征

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摘要

Drought is one of the most harmful natural hazards in the Upper Reaches of the Yangtze River basin (URYR) in the mid-west part of China. Alterations in precipitation will affect the severity of drought. The nonparametric Mann-Kendall (MK) test was used in this paper to examine the trend of precipitation and the standardized precipitation index (SPl) was adopted to analyze the spatial-temporal variations of meteorological drought over different time scales in the last 50 years. The MK test value of precipitation indicated that, for most of the URYR showed an increasing trend of precipitation in the months of January, February, March and June, mainly in the Min-Tuojiang, Jialingjiang and wujiang sub-basins and a decreasing trend was observed in August to December. The most obvious decreasing trend of precipitation occurred in the Jialingjiang, upper mainstream and Wujiang sub-basins in September, with a rate ranging from -7.89mm/ 10 years to -39.36mm/10 years. The results show that the SPl is applicable in the URYR basin. The number of severe droughts differed among the six sub-basins, i.e., a more obvious 3-month drought takes place in the middle of the upper mainstream, Wujiang sub-basins and the southeast of Jialingjiang sub-basin and other droughts in 6, 9 and 12 month timescales have the same effect in these three sub-basins. The outcomes of the paper could provide references for droughts mitigation, local water resources management and agriculture decision making.
机译：干旱是中国中西部长江流域上游地区最有害的自然灾害之一。降水量的变化将影响干旱的严重性。本文采用非参数Mann-Kendall（MK）检验来检验降水趋势，并采用标准化降水指数（SP1）分析最近50年内不同时间尺度上的气象干旱时空变化。降水的MK检验值表明，大部分URYR在1月，2月，3月和6月的几个月中出现降水增加的趋势，主要在闽陀江，嘉陵江和吴江子流域，而下降的趋势是在8月至12月观察到。降水最明显的下降趋势出现在9月的嘉陵江，上游主干流域和吴江子流域，速率从-7.89mm / 10年到-39.36mm / 10年不等。结果表明，SP1适用于URYR盆地。六个次流域的严重干旱次数有所不同，即在上中游，吴江次流域和嘉陵江次流域的东南部发生了更为明显的3个月干旱，而其他6个干旱9个和12个月的时标在这三个子流域中具有相同的效果。本文的结果可为减轻干旱，当地水资源管理和农业决策提供参考。

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  • 来源
    《Journal of Hydroinformatics》 |2012年第1期|p.221-235|共15页
  • 作者

    Nan Zhang; Ziqiang Xia; Shaofeng Zhang; Hong Jiang;

  • 作者单位

    State Key Laboratory of Hydrology - Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China and College of Water Resources, Hohai University, Nanjing, 210098, China;

    State Key Laboratory of Hydrology - Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China and College of Water Resources, Hohai University, Nanjing, 210098, China;

    River Basin water Resources Protection Bureau, Zhengzhou 450003, China;

    River Basin water Resources Protection Bureau, Zhengzhou 450003, China;

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

    drought analysis; spatial-temporal distribution; standardized precipitation index; upper reaches of the yangtze river;

    机译：干旱分析;时空分布标准化降水指数;长江上游;

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