Coastal compartments: the role of sediment supply and morphodynamics in a beach management context

IF 1.7 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES Journal of Coastal Conservation Pub Date : 2023-10-23 DOI:10.1007/s11852-023-00984-6
Rafael C. Carvalho, Colin D. Woodroffe
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Abstract

Abstract Coastal compartments provide a hierarchical framework to manage beaches and coastal ecosystems in Australia. This study examines the individual behaviour of three adjacent beaches within Shoalhaven Bight, a secondary compartment on the south coast of New South Wales (NSW). The Shoalhaven River discharges intermittently into the northernmost of the beaches, and a fluvial component is detectable within beach and foredune sands. The distribution and orientation of headlands constrains dispersal of fluvial sediments, and results in lower wave-energy conditions further south, implying limited sand transport from one beach, or tertiary compartment, to another. Two years of monthly subaerial surveys across ten different profiles and modelled storm-wave conditions during the major storms, were used to compare the response of beach volume and shoreline position. The greatest changes in volume were observed near Shoalhaven Heads and the northern ends of Culburra and Warrain-Currarong beaches. Results indicate the distinct individual response of neighbouring beaches over the two-year period, in contrast to general trends in beach behavior that might be inferred from long-term regional monitoring programs. However, they also demonstrate the limitations of short-term observations in comparison to those longer-term studies. The NSW beach systems of are some of the best understood in the world in terms of regional behaviour, as a consequence of several decades of surveys on key beaches. However, more focused local monitoring programs may be needed to establish detailed coastal sand transport, and an understanding of intermittent delivery of fluvial sand and longshore inputs and outputs, within and between different compartments.

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海岸隔室:沉积物供应和形态动力学在海滩管理中的作用
沿海区隔为管理澳大利亚的海滩和沿海生态系统提供了一个分层框架。本研究考察了新南威尔士州南海岸的二级隔间Shoalhaven Bight内三个相邻海滩的个体行为。浅滩河间歇性地流入海滩的最北端,在海滩和前沙丘中可以探测到河流的成分。海岬的分布和方向限制了河流沉积物的扩散,并导致较低的波能条件进一步向南,这意味着沙子从一个海滩或第三纪隔室到另一个海滩的运输有限。研究人员对10个不同剖面进行了为期两年的每月地面调查,并在大风暴期间模拟了风暴波条件,以比较海滩体积和海岸线位置的响应。在Shoalhaven Heads和Culburra和warraina - currarong海滩的北端观察到最大的体积变化。结果表明,在两年的时间里,与从长期区域监测计划中推断出的海滩行为的总体趋势相反,邻近海滩的个体反应截然不同。然而,与那些长期研究相比,它们也证明了短期观察的局限性。新南威尔士州的海滩系统是世界上最了解的区域行为之一,这是几十年来对主要海滩进行调查的结果。然而,可能需要更集中的地方监测计划来建立详细的沿海沙粒运输,并了解河流沙粒的间歇性输送和岸上输入和输出,在不同的隔间内和之间。
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来源期刊
Journal of Coastal Conservation
Journal of Coastal Conservation ENVIRONMENTAL SCIENCES-MARINE & FRESHWATER BIOLOGY
CiteScore
3.60
自引率
4.80%
发文量
55
期刊介绍: The Journal of Coastal Conservation is a scientific journal for the dissemination of both theoretical and applied research on integrated and sustainable management of the terrestrial, coastal and marine environmental interface. A thorough understanding of both the physical and the human sciences is important to the study of the spatial patterns and processes observed in terrestrial, coastal and marine systems set in the context of past, present and future social and economic developments. This includes multidisciplinary and integrated knowledge and understanding of: physical geography, coastal geomorphology, sediment dynamics, hydrodynamics, soil science, hydrology, plant and animal ecology, vegetation science, biogeography, landscape ecology, recreation and tourism studies, urban and human ecology, coastal engineering and spatial planning, coastal zone management, and marine resource management.
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