将BP神经网络与K-最近邻(KNN)算法耦合起来,建立BK(BP-KNN)模型,该模型以前期模拟流量和相应影响要素作为BP神经网络的输入,出口断面流量作为网络输出,对产汇流过程进行模拟;采用K-最近邻算法,基于历史样本的模拟误差和相应影响要素对...将BP神经网络与K-最近邻(KNN)算法耦合起来,建立BK(BP-KNN)模型,该模型以前期模拟流量和相应影响要素作为BP神经网络的输入,出口断面流量作为网络输出,对产汇流过程进行模拟;采用K-最近邻算法,基于历史样本的模拟误差和相应影响要素对网络输出进行修正,实现了非实时校正模式下的连续模拟。根据BK模型的计算流程将其参数分为3个层次,各层次分别使用NSGA-Ⅱ多目标优化算法进行参数优选,提高了模拟精度、优化效率和网络泛化能力。分别将新安江模型的产流、产流分水源计算模块与BK模型相耦合,建立XBK(Xinanjiang runoff production-BK)和XSBK(Xinanjiang runoff production and separation-BK)模型,在呈村等3个不同类型的流域应用新安江模型、BK模型、XBK模型和XSBK模型进行模拟精度比较,结果表明改进的模型模拟精度更高,较好地解决了神经网络模型在水文模拟中存在的问题。展开更多
The Chengcun kiln-sites in Wuyishan City are auxiliary remains of the Han period Chengcun City (Minyue royal city).Three horse-hoof-shaped kilns for firing bricks and tiles were revealed through excavation.The furnace...The Chengcun kiln-sites in Wuyishan City are auxiliary remains of the Han period Chengcun City (Minyue royal city).Three horse-hoof-shaped kilns for firing bricks and tiles were revealed through excavation.The furnace is square in plan.Bricks,tiles and tile-ends form the main remains from the interior of the kilns,and a large quantity of pottery utensils and pottery-making implements,such as paddles,were unearthed outside the kilns and from pits for waste products.Judging from their unearthed objects and condition of use,the kilns must have functioned in the earlier Western Han period and were abandoned at the time of the Minyue State's fall.The excavation is of great significance to studying the history and culture of the Minyue State in the Fujian area of the Western Han period.展开更多
文摘将BP神经网络与K-最近邻(KNN)算法耦合起来,建立BK(BP-KNN)模型,该模型以前期模拟流量和相应影响要素作为BP神经网络的输入,出口断面流量作为网络输出,对产汇流过程进行模拟;采用K-最近邻算法,基于历史样本的模拟误差和相应影响要素对网络输出进行修正,实现了非实时校正模式下的连续模拟。根据BK模型的计算流程将其参数分为3个层次,各层次分别使用NSGA-Ⅱ多目标优化算法进行参数优选,提高了模拟精度、优化效率和网络泛化能力。分别将新安江模型的产流、产流分水源计算模块与BK模型相耦合,建立XBK(Xinanjiang runoff production-BK)和XSBK(Xinanjiang runoff production and separation-BK)模型,在呈村等3个不同类型的流域应用新安江模型、BK模型、XBK模型和XSBK模型进行模拟精度比较,结果表明改进的模型模拟精度更高,较好地解决了神经网络模型在水文模拟中存在的问题。
文摘The Chengcun kiln-sites in Wuyishan City are auxiliary remains of the Han period Chengcun City (Minyue royal city).Three horse-hoof-shaped kilns for firing bricks and tiles were revealed through excavation.The furnace is square in plan.Bricks,tiles and tile-ends form the main remains from the interior of the kilns,and a large quantity of pottery utensils and pottery-making implements,such as paddles,were unearthed outside the kilns and from pits for waste products.Judging from their unearthed objects and condition of use,the kilns must have functioned in the earlier Western Han period and were abandoned at the time of the Minyue State's fall.The excavation is of great significance to studying the history and culture of the Minyue State in the Fujian area of the Western Han period.
