...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Hydrology >Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China
【24h】

Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China

机译：营养投入通过潜艇地下水排放在押金中：中国大湾的氡调查

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Daya Bay, a semi-closed bay of the South China Sea, is famous for its aquaculture, agriculture and tourism. Although routine environmental investigations in the bay have been conducted since the early 1980s, evaluations of submarine groundwater discharge (SGD), an important process in exchange between groundwater and coastal seawater, and its environmental impacts have never been reported. In this study, naturally occurring radon isotope (Rn-222) was measured continuously at two sites (north-west and middle-east sites) and used as a tracer to estimate SGD and associated nutrient inputs into the bay. The SGD rates estimated based on the Rn-222 mass balance model were, on average, 28.2 cm/d at north-west site and 30.9 cm/d at middle-east site. The large SGD rate at middle-east site may be due to the large tidal amplitude and the sandy component with high permeability in sediments. The SGD-driven nutrient fluxes, which were calculated as the product of SGD flux and the difference of nutrient concentrations between coastal groundwater and seawater, were 3.28 x 10(5) mol/d for dissolved nitrates (NO3-N), 5.84 x 10(3) mol/d for dissolved inorganic phosphorous (DIP), and 8.97 x 10(5) mol/d for reactive silicate (Si). These nutrient inputs are comparable to or even higher than those supplied by local rivers. In addition, these SGD-driven nutrients have a nitrogen-phosphorous ratio as high as 43, which may significantly affect the ecology of coastal waters and lead to frequent occurrence of harmful algal blooms. (C) 2017 Elsevier B.V. All rights reserved.
机译：南海半封闭式海湾大亚湾以其水产养殖，农业和旅游而闻名。虽然自20世纪80年代初期以来，常规环境调查已经进行了20世纪80年代初，但潜艇地下水排放（SGD）的评估，是地下水和沿海海水之间的一个重要过程，从未报告其环境影响。在本研究中，天然存在的氡同位素（RN-222）在两个位点（西北和中东地点）连续测量，用作估计SGD和相关的营养输入进入海湾的示踪剂。基于RN-222质量平衡模型估计的SGD率平均为28.2厘米/平方米，在中东地区30.9厘米/天。中东地区的大型SGD率可能是由于沉积物中具有高渗透性的潮汐幅度和砂质组分。被计算为SGD通量乘积的SGD驱动的营养助熔剂和沿海地下水和海水之间的营养浓度差异为3.28×10（5）mol / d，用于溶解硝酸盐（no3-n），5.84 x 10 （3）用于溶解的无机磷（浸渍）和8.97×10（5）mol / d的MOL / D，用于反应性硅酸盐（Si）。这些营养素输入与本地河流提供的营养输入相当。此外，这些SGD驱动的营养素具有高达43的氮磷比率，这可能会显着影响沿海水域的生态，并导致频繁发生有害的藻类盛开。 （c）2017年Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号