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首页> 外文期刊>Journal of hydrometeorology >Drought Characteristics and Propagation in the Semiarid Heihe River Basin in Northwestern China
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Drought Characteristics and Propagation in the Semiarid Heihe River Basin in Northwestern China

机译：中国西北地区半干旱地中河流域的干旱特征及繁殖

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Meteorological and hydrological droughts can bring different socioeconomic impacts. In this study, we investigated meteorological and hydrological drought characteristics and propagation using the standardized precipitation index (SPI) and standardized streamflow index (SSI), over the upstream and midstream of the Heihe River basin (UHRB and MHRB, respectively). The correlation analysis and cross-wavelet transform were adopted to explore the relationship between meteorological and hydrological droughts in the basin. Three modeling experiments were performed to quantitatively understand how climate change and human activities influence hydrological drought and propagation. Results showed that meteorological drought characteristics presented little difference between UHRB and MHRB, while hydrological drought events are more frequent in the MHRB. In the UHRB, there were positive relationships between meteorological and hydrological droughts, whereas drought events became less frequent but longer when meteorological drought propagated into hydrological drought. Human activities have obviously changed the positive correlation to negative in the MHRB, especially during warm and irrigation seasons. The propagation time varied with seasonal climate characteristics and human activities, showing shorter values due to higher evapotranspiration, reservoir filling, and irrigation. Quantitative evaluation showed that climate change was inclined to increase streamflow and propagation time, contributing from -57% to 63%. However, more hydrological droughts and shorter propagation time were detected in the MHRB because human activities play a dominant role in water consumption with contribution rate greater than (-)89%. This study provides a basis for understanding the mechanism of hydrological drought and for the development of improved hydrological drought warning and forecasting system in the HRB.
机译：气象和水文干旱可以带来不同的社会经济影响。在这项研究中，我们研究了使用标准化降水指数（SPI）和标准化的流流程指数（SSI）的气象和水文干旱特征和传播，在黑河河流域（UHRB和MHRB）的上游和中途中。采用相关分析和交叉小波变换来探讨盆地气象和水文干旱之间的关系。进行三个建模实验，以定量地了解气候变化和人类活动如何影响水文干旱和繁殖。结果表明，气象干旱特性呈现UHRB和MHRB之间的差异很小，而MHRB在水文干旱事件中更频繁。在UHRB中，气象和水文干旱之间存在正相关的关系，而干旱事件变得越来越频繁，但是当气象干旱繁殖到水文干旱时，更长。人类活动显然将正相关与MHRB中的阳性相关性改变，特别是在温暖和灌溉季节。传播时间随着季节性气候特征和人类活动而变化，由于较高的蒸散，储层填充和灌溉，呈现较短的值。定量评估表明，气候变化倾向于增加流流和传播时间，从-57％贡献到63％。然而，在MHRB中检测到更多的水文干旱和较短的传播时间，因为人类活动在耗水率下发挥着主要作用，贡献率大于（ - ）89％。本研究为了解水文干旱机制以及在HRB中改善水文干旱警告和预测系统的发展提供了基础。

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