
采用长短期记忆网络(LSTM)和K近邻算法(KNN)组合模型对水文流量进行预报,对黄河源区的吉迈、军功、唐乃亥的日径流量进行预报分析。首先用温度、降水等气象要素构建流域动态属性,用历史气象水文和地理信息资料构建流域静态属性特征,用LSTM模型开展特征优选,确定最优模型TOPO_CLIM_SOIL_LSTM后用于实际的日径流量预测,然后用KNN算法对预测结果进行实时校正。结果表明:TOPO_CLIM_SOIL_LSTM模型能更好地学习到降雨与径流之间的关系,可有效解决低流量段预测径流量跳变的问题。用KNN模型对预测流量修订后,吉迈、军功、唐乃亥站未来1 d的日径流量预报准确率均达到了93%以上,纳什系数分别提高18.07%、6.45%和12.5%,有效提高了日径流量预报精度。
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