| 珠江磨刀门河口亚潮频率水位的控制论研究 |
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| 引用本文： | 吴超羽,徐家隽.珠江磨刀门河口亚潮频率水位的控制论研究[J].海洋与湖沼,1992,23(2):156-166. |
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| 作者姓名： | 吴超羽 徐家隽 |
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| 作者单位： | 中山大学河口海岸研究所,中国科学院南海海洋研究所 广州 510275,广州 51030l |
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| 基金项目： | 国家自然科学基金 编号 48970278 |
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| 摘 要： | 本文应用现代控制论研究河口非潮汐海平面变化及其与影响要素的关系。两年连续的水位及水文气象要素资料表明,在0.01—0.50cpd的频带上水位有相当高能的波动,这些波动的能量主要直接或间接来自风应力、河流径流以及河口外的海平面波动。本文应用1982年时间序列辨识了五个二阶的MISO CAR模型,系统输出是河口亚潮频率海平面;系统输入是河流人注流量、风应力和气压。模型检验后对1983年亚潮频率海平面进行一步和多步后报,符合良好。系统仿真定量地估计了各控制因素对水位的相对重要性。频域和时域分析都表明河口水位系统具有振荡特性。
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| 关 键 词： | 河口 亚潮 珠江口 控制论 水位 |
A CYBERNETICS STUDY ON THE SUB-TIDAL SEA LEVEL VARIABILITY IN THE MODAOMEN ESTUARINE, ZHUJIANG RIVER |
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| Wu Chaoyu.A CYBERNETICS STUDY ON THE SUB-TIDAL SEA LEVEL VARIABILITY IN THE MODAOMEN ESTUARINE, ZHUJIANG RIVER[J].Oceanologia Et Limnologia Sinica,1992,23(2):156-166. |
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| Authors: | Wu Chaoyu |
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| Abstract: | The present paper is a cybernetics study on the sub-tidal sea level variations from a more extensive investigation on the "sea-river-atmosphere" system in the Zhujiang River Delta, Guangdong, China. The two-year long continuous time series records of sea level and meteorological reveal large amplitude fluctuations within the sub-tidal range 0.01-0.50 cpd. These fluctuations represent direct or indirect response of the estuary to variations in river discharge, wind stress and atmospheric pressure. MISO CAR models are identified based on 1982 time series records at five stations along the estuary. System output is sea level, system inputs are river discharge, north and east components of wind stress and atmospheric pressure. Models thus obtained and validated are used to conduct multistep prediction of 1983 mean sea level with good agreement. Frequency response analysis based on the models provides some important insights into the system. System simulations re veal, quantitatively, the relative importance and variations of the control variables on sea level in the estuary. Response analyses in both frequsn-cy and time domains indicate that the existence of an oscillatory zone in the estuary. |
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| Keywords: | Estuary Sub-tidal Zhujiang estuarine Cybernetics |
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