The forth chapter is a study of current situation of Fen River.
第四章主要是对沣河水环境现状的研究。
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结果表明，城市化对西安市主要河流年径流序列的影响强度由大到小依次是灞河、黑河、沣河；
The results show that effect of urbanization on hydrological sequence of the main rivers around Xi'an is of the decreasing order among Bahe River, Heihe River and Fenghe River;
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