长江科学院院报 2006正 Improvement of Threshold Auto—regressive Model Based on Genetic Algorithm and Its Application J IN Guang-qiu ,WANG Lian2,WANG Zong—zhi ,XU Jinf,CAO Ming-hong3 (1.School of Water Resources and Hydropower,Hohai University,Ninjing 210098,China; 2.School of Civil Engineering,Hefei University of Technology,Hefei 230009,China; 3.Anhui Honlu Steel Structure Co.,Ltd,Herei 231131,China) Abstract:Because fitted effect of threshold auto—regressive(TAR)mode1 iS sometimes better than its predicted effect,or predicted effect is bad,TAR is improved,i.e.,when time series (i)are fitted and predicted,AR’S observed values of half period besides i are replaced by calculated values of fit or forecasting of TAR mode1.By depicting the figure of auto correlation coefficients,it may ascertain clearly delayed paces and ranks of the auto- regressive model of threshold sections.The result of an example shows its improvement can enhance stability and practicability of the model and application of TAR in security supervision forecast is effective and successfu1. Key words:genetic algorithm;threshold auto-regressive model;dam;security supervision 窘盎叠盘盍 (上接第30页) [4]刘秉正,彭建华.非线性动力学[M].北京:高等教育出 库岸稳定性监测汇报会内观监测资料文集[R].武汉: 版社,2004. 长江科学院,1994. [5] Sameer.Sign Forecasting using a fuzzy nearest neighbor [7]杨绍清,章新华,赵长安.一种最大李雅普诺夫指数估 threshold[J].Fourth Joint Conference on International 计的稳健算法[J].物理学报,2000,(4):636—639. Science,1998,13(1):268 271. [6] 长江科学院大坝安全监测研究中心.清江隔河岩水库 (编辑:曾小汉) Prediction of Displacement in Landslide based on Nonlinear Dynamics CHEN Wei—bing,LI Duan—you (Yangtze River Scientific Research Institute,Wuhan 430010,China) Abstract:The time ̄ries of displacement monitoring data obtained in Maoping landslide of Qingj iang are ana— lyzed by using macroscopic study of nonlinear dynamics method.Then the mean zero—order local—region algo— rithm is propcxsed and applied in predicting displacement time series.The calculated results show that the relative error of the first month is only 0.66%,and that of previous three months may be controlled to be within 5%, the preliminary result is satisfactory. Key words:landslide;reconstruction of phase space;maximum Lyapunov exponent;mean zer-oorder local—region method 长江重庆江津段拟建两座大坝 重庆市境内的长江上,将修建两座大坝——朱杨溪大坝和小南海大坝,用于发电和改善航运。2006年3月20日,长江水 利委员会主任蔡其华率专家组一行对两座水利枢纽的坝址进行了调研,原则同意规划方案。 大坝将建在江津市境内。按规划方案,朱杨溪大坝位于朱杨镇,实际浇筑高度约为71 m,距江津城区66 km,距离主城区 139 km;小南海大坝则位于珞璜镇猫儿峡,地处长江上游,实际浇筑高度约37 m,距离江津城区39 km,距离主城区40 km。 两座大坝集发电、净化三峡水环境、航运、引水等功能于一体。据测算,工程总投资估计将超过300亿元。配套水电站建 成后,总装机容量达到400万kw,预计年发电总量200亿kw・h,相当于兴建了一个葛洲坝水电站。 (摘自长江科学院网)
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