| 磨刀门河口近期水文动力变化及人类活动对其影响研究 |
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| 引用本文： | 贾良文,吴超羽.磨刀门河口近期水文动力变化及人类活动对其影响研究[J].海洋工程,2007,25(4):46-53. |
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| 作者姓名： | 贾良文 吴超羽 |
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| 作者单位： | 中山大学,近岸海洋研究中心,广东,广州,510275 |
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| 基金项目： | 国家973项目“长时间尺度河口近岸环境演变及其对河口过程的响应”资助项目(2002CB412407) |
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| 摘 要： | 分析磨刀门河口近几十年来水文动力的变化并重点研究围垦和挖沙这二类人类活动对水文动力变化的影响。磨刀门河口近期水文动力的变化主要表现在:水位升高,主干分流比加大,断面平均流速增大;潮汐动力20世纪607、0年代至90年代初明显减弱,潮差减小,主要分潮振幅变小;20世纪90年代初至21世纪初,潮汐动力增强,潮差增大,主要分潮振幅变大,涨潮量增大。围垦加速了水位的抬升,改变了河口的径流和涨潮量分流比,使河口的断面平均流速增大,减弱了河口的潮汐动力。挖沙使河口潮汐动力增强,降低了水位上升的速度。
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| 关 键 词： | 磨刀门河口 人类活动 水文动力 变化 |
| 文章编号： | 1005-9865（2007）04-0046-08 |
| 收稿时间： | 2006-04-03 |
| 修稿时间： | 2006年4月3日 |
Hydrodynamic changes of Modaomen estuary in recent decades and impacts of human activities on the changes |
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| JIA Liang-wen,WU Chao-yu.Hydrodynamic changes of Modaomen estuary in recent decades and impacts of human activities on the changes[J].Ocean Engineering,2007,25(4):46-53. |
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| Authors: | JIA Liang-wen WU Chao-yu |
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| Abstract: | The hydrodynamic changes of the Modaomen estuary in recent decades are examined in this paper.The main changes include: rise of the water level,increase of the discharge diversion ratio of the Modaomen waterway,growth of the sectional mean welocity,weakenging of the tidal dynamics from 1960-1970's to the early 1990's,demonstrated by decrease of the tidal range and the amplitudes of the main tidal constituents,and strenghthening of the tidal dynamics from the early 1990's to the early 21st century,manifested by increase of the tidal range,growth of the main tidal constituents amplitude,and enlargement of flood tidal discharges.The main effects of the reclamation include: speeding up the water level rise,changing the diversion ratio of runoff and tidal discharge directly,increasing the sectional mean velocity and weakening the tidal dynamic.The main effects brought by sand dredging involve: strengthening the tidal dynamic,and slowing the water level rise. |
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| Keywords: | Modaomen estuary human activities hydrodynamics change |
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