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-  2014 

东江流域近50年径流系数时空变化特征

DOI: 10.11821/dlyj201406006

Keywords: 东江流域,径流系数,变化幅度热度值,空间对应

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Abstract:

摘要: 基于东江流域1964-2012 年降雨、蒸发和径流等气象水文资料,采用线性倾向估计、M-K趋势检验及变化幅度和变化弹性等多种方法,结合ArcGIS自相关等空间统计分析技术,分析了东江流域径流系数的时空变化特征及其对降雨、蒸发和地表植被等影响因素的空间对应关系。结果表明:近50 年来,东江流域年径流系数均呈上升趋势,且随着流域空间尺度的增大而增加,总体形成“南北低、中间高”的空间分布格局;径流系数变化幅度及变化弹性在20 世纪90年代之后显著增加。径流系数变化幅度热度指数高值区大致位于东源及其以北地区。相较于蒸发和地表植被覆盖,流域降雨变化趋势与径流系数及其变动幅度热度指数的空间分布格局具有较好的一致性。本文可为识别变化环境下流域来水过程变异提供科学参考依据

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