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渭河流域水文变异识别与初步解析
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Abstract:
应用滑动秩和检验法与Mann-Kendall方法对渭河干支流主要的7个水文站点的水文序列变异点的位置进行诊断与识别。结合Hilbert-Huang变换，对各水文站点数据进行EMD多尺度分解，获得不同时间尺度的IMF信号和趋势过程，然后采用滑动秩和检验法对各分解信号进行变异识别，确定变异的响应尺度。最后，结合水文变异指标(IHA)，以变异点位置为依据，进行阶段划分，识别变异前后水文序列的变异领域，对水文情势变异进行细节解析，找出发生强烈变异的水文指标。结果表明：1) 渭河干流水文站点年径流序列的变异点主要发生在1971年和1994年，1971年的水文变异主要由人类活动驱动，而1994年的水文变异则由气候变化与人类活动共同影响。2) 水文变异主要影响渭河干支流径流序列的趋势过程，只有华县站6年时间尺度变化及状头站4~6年时间尺度变化过程受到水文变异的扰动。3)
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