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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial and temporal changes in estuarine water quality during a post-flood hypoxic event
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Spatial and temporal changes in estuarine water quality during a post-flood hypoxic event

机译：洪灾后低氧事件中河口水质的时空变化

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摘要

A major fish kill occurred in the Richmond River estuary in January 2008 due to oxygen depletion following extensive overbank flooding. This paper examines spatial and temporal changes in the chemistry of main channel waters, thereby identifying the primary sources of deoxygenating water. Over 40 km of the mid- to lower estuary main channel was deoxygenated within seven days of the flood peak. Hypoxia was confined to downstream of the confluences with mid-estuary backswamp basins and occurred during the later phase of the flood recession. Water chemistry at key locations in the estuary indicated elevated concentrations of redox sensitive species associated with acid sulfate soils (ASS) during the hypoxic period. Peak concentrations of Fe~(2+) up to 18.2 μmol L~(-1), dissolved Mn up to 4.3 μmol L ~(-1), chemical oxygen demand (COD) up to 2052 μmol L~(-1), dissolved organic carbon (DOC) up to 960 μmol L~(-1) and elemental S~0 up to 4.7 μmol L~(-1) were found in the backswamp discharge confluences and mid-estuary main channel locations. The geochemical signature of main channel floodwaters identifies anaerobic decomposition of floodplain vegetation in ASS backswamps as a primary process leading to generation of hypoxic waters. The transport of these hypoxic floodwaters to the estuary has been accelerated and prolonged by extensive floodplain drainage, thereby enhancing the magnitude and duration of estuarine deoxygenation.
机译：由于大量堤岸泛滥之后，氧气耗尽，2008年1月在列治文河河口发生了重大鱼类死亡事件。本文研究了主要航道水化学的时空变化，从而确定了脱氧水的主要来源。在洪峰出现后的七天内，河口中下游主河道的40多公里被除氧。缺氧局限在河口中部回潮盆地汇合处的下游，发生在洪水衰退的后期。河口关键位置的水化学表明，在缺氧期间与酸性硫酸盐土壤（ASS）相关的氧化还原敏感物种的浓度升高。 Fe〜（2+）的峰值浓度高达18.2μmolL〜（-1），溶解的Mn高达4.3μmolL〜（-1），化学需氧量（COD）高达2052μmolL〜（-1），在回灌水汇流口和河口中部主河道位置发现了高达960μmolL〜（-1）的溶解有机碳（DOC）和高达4.7μmolL〜（-1）的元素S〜0。主要河道洪水的地球化学特征确定了ASS回灌区洪泛区植被的厌氧分解是导致缺氧水产生的主要过程。大量洪泛区排水加快并延长了这些低氧洪水向河口的运输，从而增加了河口脱氧的幅度和持续时间。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第1期|73-82|共10页
  • 作者

    Vanessa N.L. Wong; Scott G.Johnston; Richard T. Bush; Leigh A. Sullivan; Christina Clay; Edward D. Burton; Peter G. Slavich;

  • 作者单位

    Southern Cross GeoScience, Southern Cross University PO Box 157, Lismore NSW 2480, Australia;

    rnSouthern Cross GeoScience, Southern Cross University PO Box 157, Lismore NSW 2480, Australia;

    rnSouthern Cross GeoScience, Southern Cross University PO Box 157, Lismore NSW 2480, Australia;

    rnSouthern Cross GeoScience, Southern Cross University PO Box 157, Lismore NSW 2480, Australia;

    rnNew South Wales Department of Industry and Investment, Wollongbar Primary Industries Institute 1243 Bruxner Highway, Wollongbar NSW 2477, Australia;

    rnSouthern Cross GeoScience, Southern Cross University PO Box 157, Lismore NSW 2480, Australia;

    rnNew South Wales Department of Industry and Investment, Wollongbar Primary Industries Institute 1243 Bruxner Highway, Wollongbar NSW 2477, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    deoxygenation; hypoxia; richmond river estuary; floodplain; fish kill; blackwater;

    机译：脱氧缺氧里士满河河口洪泛区鱼杀黑色的水;

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