| 瓯江北口海域沉积物粒度特征及控制因素 |
| Grain-Size Characteristics and Controlling Factors of Sediment Types in the Oujiang North Sea Area |
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| DOI：doi：10.3969/j.issn.1003-2029.2025.04.006 |
| 中文关键词: 粒度参数 沉积物来源 沉积动力 沉积物运移趋势 |
| 英文关键词:grain-size parameters provenance of sediment sedimentary dynamics transportation trend of sediment |
| 基金项目:浙江省自然资源厅科技项目（2025ZJDZ008）；浙江省级基础性公益性战略性地质工作项目（〔省资〕2024010） |
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| 中文摘要: |
| 为了探究瓯江北口海域沉积物粒度特征，利用研究区44 个沉积物样品和1 个沉积动力观
测站位数据，分析了瓯江北口海域沉积物类型、粒度组分和粒度参数的分布特征，并从沉积物来
源、沉积动力环境和沉积物输运趋势3 个方面对其控制因素进行研究。研究表明：瓯江北口海域沉
积物类型有5 种：细砂、中砂、粗砂、泥质砂和泥。海域沉积物中值粒径范围为0.25 Φ—8.65 Φ，
沉积物分选较差。山溪性河流携带的陆源物质和浙闽沿岸流带来的长江入海细颗粒物质是研究区泥
沙沉积物重要来源。沉积动力观测站位潮流和潮位数据显示，瓯江北口海域具有较强水动力环境，
沉积物以粗的砂粒级组分为主。Gao-Collins 粒度趋势分析方法反映出瓯江北入海口沉积物有东南方
向净运移趋势，外海搬运来的泥沙进入研究区后主要向西南方向净运移，泥沙沉积物在研究区中部
汇聚。通过分析研究瓯江北口海域粒级组分分布特征及控制因素，可为航道治理和资源开发等工作
提供重要参考。 |
| 英文摘要: |
| To reveal the grain-size characteristics of sediment types of the Oujiang north sea area. Using 44 sediment samples and 1 sedimentary dynamic observation station have be used from the study area. Analyzing the distribution characteristics of sediment types, grainsize
components and grain-size parameters in the sea area, and the controlling factors were studied from three aspects: provenance of sediment, sedimentary dynamic environment, transportation trend of sediment. The results indicate that, there are five types of sediment: fine
sand, medium sand, coarse sand, muddy sand, and mud in the Oujiang north sea area. Median diameter of the study area is 0.25 Φto 8.65 Φ,
which show the sediment sorting coefficient in this sea area is poor. The terrestrial material carried by mountain stream rivers and the fine
particulate matter from the Yangtze River transported by the Zhejiang-Fujian coastal current are important sources of sediment deposits in
the studied sea area. The tidal and water level data from sediment dynamic observation stations indicate that the water dynamic environment in the north mouth of the Oujiang River is strong in the north mouth of the Oujiang River, and the sediment is mainly composed of
coarse sand grain fractions. The Gao-Collins grain-size trend analysis method reveals a net transport trend of SE direction for the sediments
in the northern estuary of the Oujiang River. Sediments transported from the open sea enter the study area and are mainly transported in the
SW direction, with sediments accumulating in the central part of the study area. By analyzing the distribution characteristics and control
factors of grain size fractions in the north mouth of the Oujiang River, we can provide important references for navigation management and
resource development. |
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