| 摘要: |
| 本文基于2016年11月8日-2019年6月29日大沽河入海口水深观测数据分析了大沽河河口水位变化特征，并结合风场、降水量、卫星高度计融合产品资料对其影响因素展开了讨论。结果表明：1）大沽河口水位变化由潮汐过程主导，潮汐类型为正规半日潮，M2分潮占主导；2）余水位在2017年7月-2019年1月存在周期约为110-150天的显著季节内变化，主要受到纬向风的影响，监测系统处在大沽河入海口西岸，东向（西向）风将驱动水体向东（西）输运，导致西岸监测系统处水量减少（增加），从而观测到余水位下降（上升）；3）观测期间，余水位存在显著下降趋势，约为-0.53×10-2m/月，主要受到大沽河流域降水量减少的影响。 |
| 关键词: 大沽河口 水位变化 纬向风 降水 |
| DOI：10.11759/hykx20200821002 |
| 分类号:P731.2 |
| 基金项目:国家自然科学基金项目（41776012）；国家重点研发计划（2019YFD0901305）；浙江省重点研发计划（2020C03012）；三亚崖州湾科技城管理局重大科技项目（YZ2019ZD0X） |
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| Analysis of the characteristics of water level variation in Dagu River estuary |
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LAI Qiu-yu1, LIU Zi-zhou1, ZHAI Fang-guo1, GU Yan-zhen1, CHEN Dong2, JIANG Qing-yan2
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1.College of Ocean and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;2.Ocean College, Zhejiang University, Zhoushan 316021, China
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| Abstract: |
| This study analyzed the characteristics of water level variation in the Dagu River estuary and its influencing factors combined with the wind field, precipitation, and satellite altimetry data based on the depth observation data of Dagu River estuary from November 8, 2016 to June 29, 2019. Results showed that (1) the water level variation in Dagu River estuary was dominated by a normal semidiurnal tidal process and the M2 subtide was dominant. (2) The residual water level (RWL) had a significant intraseasonal period of approximately 110-150 days, which was mainly affected by zonal wind, i.e., the eastward (westward) wind would drive water transport to the east (west), decreasing (increasing) the water volume at the west bank at which the monitoring system was located, leading to the decrease (increase) in RWL. (3) During the observation period, the RWL exhibited a significant downward trend, approximately −0.53×10−2 m/month, which was mainly affected by the decrease in precipitation in the Dagu River basin. |
| Key words: Dagu River estuary water level variation zonal wind precipitation |
