| 摘要: |
| 基于1965年以来的不同时期水深地形数据和卫星遥感影像资料, 对乐清湾岸线和不同特征值水深所围水域面积的历史变化进行研究, 根据GIS技术计算乐清湾近50年的不同水域面积的演变特征。利用实测地形资料和水文数据建立乐清湾海域二维潮流数学模型分析乐清湾水域纳潮量的演变情况。结果表明: (1) 乐清湾海域纳潮量近50年减少3.16×108m3, 2013年较1965年减少17.69%, 年均递减速率由0.06×108m3/a增加至近年的1.96×108m3/a; (2) 海湾不同区域围填海造成相应海区水域面积的缩减, 但纳潮量对水域面积改变的响应程度有显著差别。内湾滩涂围垦对乐清湾不同湾区纳潮量影响十分有限, 外湾围垦对纳潮量的影响由外湾向内湾明显递减。漩门湾二期工程显著改变乐清湾的潮流形态, 造成各个湾区纳潮量均出现大幅度的调整。本研究可以为海湾的生态环境保护和预测海湾的发展趋势提供量化的参考数据。 |
| 关键词: 乐清湾 水域面积 纳潮量 演变分析 |
| DOI：10.11759/hykx20161019001 |
| 分类号: |
| 基金项目:浙江省自然科学基金项目(LY13D060003) |
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| Analysis of evolution of tidal prism of the Yueqing Bay |
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WANG Cheng-chao,PAN Guo-fu,XU Xue-feng,CHEN Pei-xiong
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| Abstract: |
| In this study, we investigated the historical change conditions along the Yueqing coastline and the different characteristic water depths around the area. Based on the topographical data of different periods and satellite remote sensing image data since 1965, we accurately calculated the evolution characteristics of different water areas over these 50 years. Also, using actual measured topographical and hydrological data, we developed a two-dimensional tidal mathematical model of the Yueqing Bay to analyze the evolutionary changes in the tidal volume. The results reveal that: (1) The tidal volume in the Yueqing Bay has decreased by 3.16 × 108m3 over the past 50 years. Compared with the tidal volume in 1965, the tidal volume of 2013 shows it to have decreased by 17.69%. The average annual decline rate has changed from 0.06 × 108m3/a to the current 1.96 × 108m3/a. (2) Enclosing and reclamation processes in different areas have shown some impact on the reduction of the sea water area, but the tidal volume impact is significant. The inner enclosing impact has been small whereas the outer enclosing impact has obviously diminished from inside the bay to the inner bay. The second phase of the Xuanmen Bay has had a great impact on changes in the Yueqing Bay’s tidal status, and has greatly affected the tidal volumes in all bays in the area. As demonstrated in this study, it is possible to provide quantitative reference data for the ecological environment protection of the bay and to forecast the development trend of the gulf by exploring the mutual responses of the change in the tidal volume and the reclamation activity in the Yueqing Bay. |
| Key words: the Yueqing Bay water area tidal prism evolution analysis |
