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中文摘要：
河流系统是一个经济社会、自然资源、生态环境相互耦合的开放系统，它通过水事活动直接或间接地与外界进行物质与能量交换，促使系统形成不同时空演化格局。根据耗散结构原理，本文对河流系统耗散结构进行了识别，并将模糊理论和信息熵结合起来，建立了一种基于耗散结构理论的河流系统水质演化模型，促进和完善了水资源系统分析理论和方法。并将此模型运用于广东省东江惠州河段河流系统时空格局演化规律的研究中，得到了比较满意的结果。
英文摘要：
River system is an open system integrating various elements such as economy, society and entironment, in which substance and energy have direct or indirect exchanges through the activities concerned with water and thus there is evolution in different ways. According to the dissipative structure theory, the dissipative structure of river system was described in this paper and a river water quality evolution model was developed based on the theory of information entropy and fuzzy theory, which advances the theoretical and methodological research on water resources systems. This model was applied to the research on the water quality evolution law in Huizhou Reach of the Dongjiang River, and a satisfactory result was obtained.
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