...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Changes in water quality following opening and closure of a bar-built estuary (Pescadero, California)
【24h】

Changes in water quality following opening and closure of a bar-built estuary (Pescadero, California)

机译：打开和关闭酒吧式河口后的水质变化（加利福尼亚州佩斯卡德罗）

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

Bar-built estuaries are coastal environments characterized by the partial closure of the estuary's mouth with a sandbar barrier for extended periods (closed state). Through natural events (rainfall) or anthropogenic influences, the sandbar is breached, reopening the estuary to the ocean. The transition from closed to open state often leads to extensive physical and chemical changes in the estuarine conditions, as water mixing and sediment resuspension are increased, which could result in the oxidation of sediment acid-volatile sulfides (AVS). We followed monthly changes in water's and sediment geochemical characteristics at thirty-two sites spanning the Pescadero Estuary over a one-year period. We showed that the transition from closed to open state leads to significant decreases in aqueous pH to circumneutral values and significant increases in aqueous hydrogen sulfide and iron concentrations to 10.6 mu M and 59.1 mu M, respectively, due to sediment AVS oxidation following sediment resuspension. Aqueous hydrogen sulfide concentrations observed in both closed and open states were significantly higher than the recommended thresholds for aquatic life. Moreover, mildly acidic water conditions in the open state were lower than the recommended limits for aquatic life. Our spatial analysis further highlighted that some parts of the estuary were more vulnerable to decreased water quality. Indeed, high sediment AVS contents (19-24 mmol kg(-1)) were observed year-round at the River Confluence and Butano Creek regions, which implies a high potential for severe water acidification and metal release when the estuary transitions from closed to open state.
机译：棒状河口是沿海环境，其特征是河口口被部分封闭，沙洲屏障持续较长时间（封闭状态）。由于自然事件（降雨）或人为因素的影响，沙洲被破坏，河口重新向海洋开放。从封闭状态到开放状态的转变通常会导致河口条件发生广泛的物理和化学变化，因为水的混合和沉积物的重新悬浮增加，这可能导致沉积物酸挥发性硫化物（AVS）氧化。在一年的时间内，我们跟踪了Pescadero河口的32个站点的水和沉积物地球化学特征的每月变化。我们表明，由于沉积物重悬浮后的沉积物AVS氧化，从封闭状态到开放状态的转变导致水溶液pH值显着降低至周围环境值，并且硫化氢和铁的水溶液浓度分别显着增加至10.6μM和59.1μM。在关闭和打开状态下观察到的硫化氢水溶液浓度均明显高于建议的水生生物阈值。此外，在开放状态下的弱酸性水条件低于建议的水生生物极限。我们的空间分析进一步强调，河口的某些部分更容易受到水质下降的影响。确实，全年在河汇合处和布塔诺克里克地区观测到较高的沉积物AVS含量（19-24 mmol kg（-1）），这意味着当河口从封闭过渡到深水过渡时，严重的水酸化和金属释放的可能性很高。打开状态。

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