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| 1 | Tidal Asymmetry Changes in a Shallow Mud Estuary by a Restoration Project显示文摘The tidal asymmetry-induced siltation below tidal barriers is a worldwide problem that restricts regional socio-economic and environmental development. The hydrodynamic processes of the small mud estuary also feature a high uncertainty after estuary restoration measures. In this study, a hydrodynamic model based on the MIKE21 is used to quantify the responses of tidal asymmetry to a two-phase restoration project in Shuanglong Estuary, Bohai Bay, China. According to the numerical modeling results, the tidal flat removal in the upper estuary(first-phase restoration) induces the flood asymmetry switching to the ebb asymmetry in unrestored reach but enhances flood asymmetry in widening restored reach. Although the tidal asymmetry reverts to flood-dominated pattern after full restoration over the estuary, the imbalance between flood and ebb velocities is relieved. A possible net sediment transport pattern based on a comparison of dominant asymmetric current and actual sediment transport period shows net sediments in the upper estuary and inlet transport seaward and landward, respectively, in the first-phase restoration, whereas landward net sediment transport occurs in the whole estuary under the second-phase restoration scenario. Given these results, we assume that a switch from the flood-dominated estuary to ebb-dominated estuary can be caused by redesigning the cross-sectional profile. The quantitative comparison of Lagrangian residual currents also implies that a channel–shoal structure rather than a flat bathymetry can promote the mass transport. Therefore, reshaping the channel–tidal flat system in restoration projects can prevent the sedimentation of the estuary and improve the water environment. | LIANG Huidi KUANG Cuiping GU Jie MA Yue CHEN Kuo LIU Xu | 2019 | Journal of Ocean University of China2019，18，2： | 2 |
| 2 | 基于GEE的东海渔场长时间序列环境分析显示文摘地球环境变化分析研究中,大尺度长时间序列遥感是研究的数据基础。Google Earth Engine(GEE)借助谷歌公司高性能的并行计算与高效率的数据管理技术,为科研人员提供在线可视化计算和分析处理的云平台。文章利用GEE提取MODIS-Terra的L3SMI的海表温度和叶绿素数据,根据东海渔场范围计算20年的年平均温度和叶绿素。通过分析表明:我国东海的渔场的年平均海表温度由北向南逐渐升高,近海渔场年平均温度在20~26℃,外海渔场年平均温度在22~28℃,外海年平均温度高于近海。东海的渔场年平均叶绿素浓度由北向南逐渐降低,近海渔场年平均叶绿素浓度在0.8~4 mg/m3,外海渔场年平均叶绿素浓度在0.1~1.2 mg/m3,外海渔场低于近海渔场。 | 张胜茂 常卫东 王斐 杨胜龙 | 2021 | 电脑与信息技术2021，29，1： | 1 |
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