根据HBV水文模型的基本原理，建立了西北干旱区内陆河出山径流概念性水文模型。
Based on the basic principle of the HBV conceptual hydrological model, a hydrological model of the mountainous watersheds in the arid inland area of northwest China was developed by the authors.
用秩次相关分析法检验得出灞河出山径流序列均存趋势性，用有序聚类分析法分析得出灞河出山径流序列的突变年份是1948年。
Rank correlation analyses show that all of the runoff sequence change with tendency, and the sudden change appeared in 1948, as concluded by order cluster analysis method.
用秩次相关分析法检验得出灞河出山径流序列均存趋势性，用有序聚类分析法分析得出灞河出山径流序列的突变年份是1948年。
Rank correlation analyses show that all of the runoff sequence change with tendency, and the sudden change appeared in 1948, as concluded by order cluster analysis method.
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