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改进的QGA-BP模型在复杂水质预测中的应用

, PP. 705-708

Keywords: 改进的量子遗传算法优化BP神经网络(QGA-BP)模型,水质预测,动态改进策略,灾变策略

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Abstract:

水质预测是实现非线性水系统的柔性管理、防治水污染的前提工作。机理性水质预测模型的构建往往较复杂并且需要大量运算与数据,预测效果有时不够精确,其进一步推广应用也受到限制。文中以淮河复杂水环境非机理性水质预测为目的,构建改进的量子遗传算法优化BP神经网络模型,采用动态改进策略和灾变策略作为进化操作准则来优化BP模型的权值和阈值,用历史观测数据作为学习范例训练模型。对比实验结果发现,模型改进以后,进化代数、收敛速度和预测结果的准确率有较大提高。该模型用于水质预测的黑箱问题是可行的,拓展水环境管理的思路。

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