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首页> 外文期刊>Journal of Hydrology >Improvement of evaluation of water age and submarine groundwater discharge: A case study in Daya Bay, China
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Improvement of evaluation of water age and submarine groundwater discharge: A case study in Daya Bay, China

机译：改善水时龄和潜艇地下水排放评价 - 以中国大湾

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摘要

The water age in coastal waters can be estimated by a simplified formula defined by activity ratio of radium isotopes when neglecting the effects of four factors including recirculated seawater (RSGD), open sea water end-member, sediments and rivers. Although this formula has been widely used, sometimes it is applied without checking the assumptions of neglecting the effects of the above-mentioned four factors. Here an attempt is made to give a generalized formula for estimating water age explicitly incorporating all the above-mentioned effects. The formula is then applied in Daya Bay, China by comprehensively using all the radium quartet (Ra-223,(224),(226),(228)) data to assess the water age and submarine groundwater discharge (SGD). Data analyses indicate that the factors such as RSGD, open sea water end-member, sediments and rivers should be included in the general radium model when there are various radium sources and their contributions are unknown. It is found that in Daya Bay, neglecting the effects of RSGD underestimates the water age by 26-46% and neglecting the effects of open sea water end-member overestimates the water age by 120-130%. The SGD-derived fluxes of nutrients and trace elements are significantly higher than those from local rivers. SGD can support approximately 63-70% of the total primary production. Overall, this study emphasizes again the importance of the general radium model and enhances accuracy in estimating water age and SGD. Our results also reveal that SGD significantly influences coastal primary production in Daya Bay and other similar aquatic ecosystems.
机译：当忽略包括再循环海水（RSGD）的四个因素，开放海水终点成员，沉积物和河流的效果时，沿海水域中的沿海水中的水位可以通过镭同位素的活性比定义的简化配方估算。虽然该配方已被广泛使用，但有时会应用它而不检查忽略上述四种因素的效果的假设。这里尝试用于估计估计水时期的广义公式，明确地纳入所有上述效果。然后通过全面使用所有镭quartet（RA-223，（224），（226））数据来评估水时期和潜艇地下水放电（SGD），在中国普遍地应用该公式。数据分析表明，当有各种镭源时，应在一般镭模型中包含诸如RSGD，Open Sea-Pater End-Memile，沉积物和河流等因素，并且它们的贡献未知。结果发现，在大塔湾，忽略了RSGD的影响低估了水时代达到了26-46％，忽略了开阔的海水末端成员估计浇水年龄的影响120-130％。 SGD衍生的营养素和微量元素的助熔剂显着高于当地河流的助熔剂。 SGD可支持大约63-70％的初级生产。总体而言，这项研究再次强调了一般镭模型的重要性，并提高了估计水时期和SGD的准确性。我们的结果还揭示了SGD在大亚湾和其他类似水生生态系统中显着影响沿海初级生产。

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  • 来源
    《Journal of Hydrology》 |2020年第2020期|共13页
  • 作者

    Zhang Yan; Li Hailong; Guo Huaming; Zheng Chunmiao; Wang Xuejing; Zhang Meng; Xiao Kai;

  • 作者单位

    China Univ Geosci Beijing MOE Key Lab Groundwater Circulat &

    Environm Evolu Beijing 100083 Peoples R China;

    China Univ Geosci Beijing State Key Lab Biogeol &

    Environm Geol Beijing 100083 Peoples R China;

    China Univ Geosci Beijing MOE Key Lab Groundwater Circulat &

    Environm Evolu Beijing 100083 Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn Guangdong Prov Key Lab Soil &

    Groundwater Pollut Shenzhen 518055 Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn Guangdong Prov Key Lab Soil &

    Groundwater Pollut Shenzhen 518055 Peoples R China;

    Zhong Di Bao Lian Beijing Land &

    Resource Explora Beijing 100193 Peoples R China;

    Southern Univ Sci &

    Technol Sch Environm Sci &

    Engn Guangdong Prov Key Lab Soil &

    Groundwater Pollut Shenzhen 518055 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水文科学（水界物理学）;
  • 关键词

    Radium isotopes; Water age; Submarine groundwater discharge (SGD); Nutrients and trace elements; Primary production;

    机译：镭同位素;水时龄;潜艇地下水排放（SGD）;营养素和微量元素;初级生产;

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