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中文摘要：
海河流域是我国各类水问题最为突出的流域，其主要原因是流域水循环的驱动力、循环结构、循环参数在人类活动的影响下发生二元演变效应，并导致了各种不良后果。中国水利水电科学研究院主持的国家重点基础研究发展计划（975）课题“海河流域二元水循环模式与水资源演变机理”（2006CB405401）主要从流域二元水循环理论、不同时间尺度流域水循环演变规律与机理、强人类活动作用下流域四水转化关系这三点关键科学问题出发开展相关研究工作，为变化环境下水循环的基本认知模式、区域性水文极值事件频发机理、现代环境下水资源衰减规律等提供了重要的研究参考。
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