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现代地质 ›› 2022, Vol. 36 ›› Issue (01): 68-76.DOI: 10.19657/j.geoscience.1000-8527.2021.162

• 海洋地质学 • 上一篇    下一篇

我国沿海不同气候带山溪性河流沉积物输运特征

孙爽1(), 胡克1(), 李琰1, 杨俊鹏2   

  1. 1. 中国地质大学(北京) 海洋学院,北京 100083
    2. 许昌学院 城市环境学院,河南 许昌 461000
  • 收稿日期:2021-09-20 修回日期:2021-11-20 出版日期:2022-02-10 发布日期:2022-03-08
  • 通讯作者: 胡克
  • 作者简介:胡 克,男,教授,博士生导师,1957年出生,海洋科学专业,主要从事海岸带国土开发与资源环境方面的研究。Email: huke@cugb.edu.cn
    孙 爽,女,博士研究生,1994年出生,海洋科学专业,主要从事海岸带地质与环境方面的研究。Email: sunshuang1227@outlook.com
  • 基金资助:
    中国地质调查局绿色矿山建设第三方评估项目(D217067)

Sediment Transport Characteristics of Mountainous Rivers in Different Climatic Zones of Coastal China

SUN Shuang1(), HU Ke1(), LI Yan1, YANG Junpeng2   

  1. 1. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
    2. College of Urban and Environmental Sciences, Xuchang University,Xuchang, Henan 461000, China
  • Received:2021-09-20 Revised:2021-11-20 Online:2022-02-10 Published:2022-03-08
  • Contact: HU Ke

摘要:

近年来许多研究发现山溪性小河流具有瞬时大通量、受极端气候事件控制、沉积物快速输运等特性,但是由于缺乏充足的监测数据和系统总结,其对全球沉积物输运的影响被低估,导致对于这个不同于大河流域的河海交互和风化传输系统的研究是不充分的。揭示不同气候带山溪性河流在自然变化与人类活动共同影响下的沉积物输运特征有助于深入理解地球表生过程和全球海陆相互作用机制。总结了全球土壤有机碳含量,中国南北方温带和热带的山溪性河流的泥沙等气象水文数据和黏土矿物等矿物学数据,结果表明:(1)全球山溪性河流流域的土壤有机碳含量较高。在中国,热带山溪性河流流域初级生产力高于温带流域,所以其土壤有机碳含量高于温带流域;在热带各流域中,台湾岛上的河流地形坡降比最高,所以其是中国土壤有机碳高含量地区。山溪性河流将沉积物快速输运到河口和海岸带地区,大大提高了有机碳的埋藏效率,因此其是研究全球有机碳源汇过程不容忽视的组分。(2)在中国,无论温带还是热带,山溪性河流均对极端气候事件响应强烈,而且流域面积越小、地形越陡峭的河流对极端气候事件的响应越强烈。(3)无论构造活动是否强烈,中国山溪性河流沉积物的矿物学特征都可以精确地指示物源信息,构造稳定带和流域坡降比较低的山溪性河流,其沉积物能够更精确地记录古气候特征。(4)山溪性河流沉积物对人类活动非常敏感,现有的人类活动对其改造要远低于大河流域。

关键词: 山溪性河流, 土壤有机碳含量, 沉积物输运, 极端气候

Abstract:

In recent years, many studies have found that small mountainous rivers have instantaneous enormous flux, strong response to extreme climate events, and rapid sediment transport. However, the effects of mountainous rivers on global sediment transport have been underestimated due to the lack of adequate monitoring data and system summary. There are still inadequate studies on the mountainous rivers with different river-ocean and weathering-transportation from the mega-river systems. Revealing the sediment transport characteristics of different climates in the common natural and anthropogenic influence would help to understand the Earth’s surface processes and the global land-sea interactions. This paper summarizes the global soil carbon content, as well as meteorological, hydrologic, and mineralogical data of mountainous rivers of the different climatic zone in the coastal China region. We summarized that: (1) Soil organic carbon content of the mountainous river basins is high in China, and the primary productivity of the tropical mountainous river basins is higher than that in the temperate basins, thus the soil organic carbon content of the former is also higher. Among the tropical basins, the river relief in Taiwan, China is the highest, hence its soil organic carbon content is very high in China. In addition, the rapid sediment transport to the estuary and coastal zone by mountainous rivers has greatly improved the burial efficiency of organic carbon, therefore it represents a significant component of the global organic carbon source and sink; (2) Regardless temperate or tropical climatic zone, the mountainous rivers have strong response to extreme climate. Furthermore, the smaller the watershed area and the steeper the river terrain, the stronger the river responds to extreme climatic events; (3) Regardless of the tectonic activity intensity, the mineralogical characteristics of the mountainous rivers can accurately indicate the source information in sediments. Moreover, sediments from the rivers in low-relief and tectonic stable zone can record more detailed climatic characteristics; (4) Sediments in mountainous rivers are very sensitive to human activities, while the sedimentary environment influence from existing human activities is far lower than in the mega-river basins.

Key words: mountainous rivers, soil organic carbon content, sediment transport, extreme climate event

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