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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sediment dynamics of an artificially deepened mesotidal coastal lagoon: An environmental magnetic investigation of Tauranga Harbour, New Zealand
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Sediment dynamics of an artificially deepened mesotidal coastal lagoon: An environmental magnetic investigation of Tauranga Harbour, New Zealand

机译：人工加深的中生海岸沿海泻湖的沉积动力学：新西兰陶朗加海港的环境磁研究

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摘要

Tauranga Harbour, New Zealand's largest barrier-enclosed coastal lagoon, comprises two sub-basins with separate catchments, inlets and tidal channel systems. This study sets out to assess and investigate the sediment dispersal system of Tauranga Harbour using standard environmental magnetic and sedime-ntological methods. Compilations of rock magnetic and grain size data of surficial sediments collected from inflowing rivers, various estuarine environments (estuaries, tidal flats and tidal channels) and the adjacent nearshore mirror the net and differential sediment fluxes into and through the two sub-basins of this lagoon. For all studied depositional environments, the magnetogranulometric ratios SIRM/K and ARM/K are positively correlated with magnetic mineral content (SIRM, ARM, chi) in the sense that larger magnetic particles are associated with higher magnetic enrichment. Grain-size analyses show that magnetic enrichment during particle transport and deposition can result from grain-size as well as from grain-density fractionation. The periodically changing accumulation/erosion conditions provide for a selective retention of specific grain sizes and an enhancement of the heavier magnetic mineral particles. Magnetic crystal size and clastic grain size correlate poorly over the whole study area, but group within similar depositional environments. Coarser magnetic and clastic grain sizes and higher magnetite enrichment in the southern sub-basin can be reconciled with episodic flood runoff of the Wairoa River and a much larger, artificially deepened southern tidal inlet which likely enables higher tidal current velocities. Our approach of combining magnetic and clastic grain-size could be successfully implemented to establish a conceptual model of sediment dynamics and gravitational sorting within Tauranga Harbour. (C) 2017 Elsevier Ltd. All rights reserved.
机译：陶朗加海港是新西兰最大的封闭围栏的沿海泻湖，包括两个分流域，每个分流域都有独立的集水区，进口和潮汐通道系统。本研究着手使用标准的环境磁学和镇静学方法评估和研究陶朗加港的沉积物扩散系统。从流入的河流，各种河口环境（河口，潮滩和潮汐通道）和附近的近海收集的表层沉积物的岩石磁性和粒度数据的汇编反映了流入和穿过该泻湖两个子盆地的净和差异性泥沙通量。在所有研究的沉积环境中，磁粒度比SIRM / K和ARM / K与磁性矿物质含量（SIRM，ARM，chi）呈正相关，因为较大的磁性粒子与较高的磁性富集有关。粒度分析表明，颗粒传输和沉积过程中的磁性富集可能是由于粒度以及粒度密度分馏引起的。周期性变化的累积/侵蚀条件提供了特定晶粒尺寸的选择性保留，并增强了较重的磁性矿物颗粒。在整个研究区域中，磁性晶体的大小和碎屑晶粒的大小相关性很弱，但是在相似的沉积环境中却是成组的。南部次流域的粗大的磁性和碎屑颗粒尺寸以及较高的磁铁矿富集可以与怀罗阿河的间歇性洪水径流和更大的人工加深的南部潮汐入口相调和，这有可能实现更高的潮流速度。我们结合磁和碎屑粒度的方法可以成功地实施，以建立陶朗加港内沉积动力学和重力分类的概念模型。 （C）2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Estuarine Coastal and Shelf Science》 |2017年第15期|240-251|共12页
  • 作者

    Badesab Firoz; von Dobeneck Tilo; Briggs Roger M.; Bryan Karin R.; Just Janna; Mueller Hendrik;

  • 作者单位

    Univ Bremen, MARUM Ctr Marine Environm Sci, Klagenfurter Str, D-28359 Bremen, Germany|Univ Bremen, Fac Geosci, Klagenfurter Str, D-28359 Bremen, Germany|Univ Waikato, Sch Sci, Private Bag 3105, Hamilton, New Zealand|Natl Inst Oceanog, CSIR, Panaji 403004, Goa, India;

    Univ Bremen, MARUM Ctr Marine Environm Sci, Klagenfurter Str, D-28359 Bremen, Germany|Univ Bremen, Fac Geosci, Klagenfurter Str, D-28359 Bremen, Germany;

    Univ Waikato, Sch Sci, Private Bag 3105, Hamilton, New Zealand;

    Univ Waikato, Sch Sci, Private Bag 3105, Hamilton, New Zealand;

    Univ Bremen, MARUM Ctr Marine Environm Sci, Klagenfurter Str, D-28359 Bremen, Germany|Univ Bremen, Fac Geosci, Klagenfurter Str, D-28359 Bremen, Germany;

    Univ Bremen, MARUM Ctr Marine Environm Sci, Klagenfurter Str, D-28359 Bremen, Germany|Univ Bremen, Fac Geosci, Klagenfurter Str, D-28359 Bremen, Germany;

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

    Coastal lagoon; Magnetic minerals; Environmental magnetism; Magnetic granulometry; Heavy mineral enrichment; Tauranga harbour; New Zealand;

    机译：沿海泻湖;磁性矿物;环境磁性;磁性粒度分析;重矿物富集;陶朗加海港;新西兰;

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