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<p>Construction of hard defense structures is the primary strategy employed globally to alleviate beach erosion, and its usage is expected to increase due to the accelerated coastal retreat and erosion driven by rising sea levels and storms. This study investigated the effects of coastal constructions on the intertidal benthic assemblages, including macrofauna and meiofauna, along with beach topography, sediment grain size, and organic matter in areas altered by low-crested breakwaters and seawalls, in comparison to natural, unmodified areas. Temporal variations of physical and biological properties were quantified across monsoon seasons. Generally, the slopes of beaches modified by the structures were approximately 75% higher than the natural beaches. The end-of-wall effect was observed at the site modified by the seawall, where downdrift erosion occurred during the monsoon season. Changes in physical conditions might lead to a marked reduction of macrofaunal abundance at the modified sites; however, the effect was not detected in meiofauna. The assemblage compositions varied temporally, and the responses to beach modification were specific to the taxon or the faunal groups studied. As coastal structures become more common, environmentally sustainable beach management must address the ecological impacts of modifying beach habitats and minimize changes to surrounding hydrodynamic and sediment properties.</p>

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Anthropogenic Modification Affects Beach Morphodynamics and Benthic Invertebrate Assemblages on Tropical Monsoon-Influenced Sandy Shores

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Kringpaka Wangkulangkul,
  • Lutfee Hayeewachi,
  • Prakrit Noppradit

摘要

Construction of hard defense structures is the primary strategy employed globally to alleviate beach erosion, and its usage is expected to increase due to the accelerated coastal retreat and erosion driven by rising sea levels and storms. This study investigated the effects of coastal constructions on the intertidal benthic assemblages, including macrofauna and meiofauna, along with beach topography, sediment grain size, and organic matter in areas altered by low-crested breakwaters and seawalls, in comparison to natural, unmodified areas. Temporal variations of physical and biological properties were quantified across monsoon seasons. Generally, the slopes of beaches modified by the structures were approximately 75% higher than the natural beaches. The end-of-wall effect was observed at the site modified by the seawall, where downdrift erosion occurred during the monsoon season. Changes in physical conditions might lead to a marked reduction of macrofaunal abundance at the modified sites; however, the effect was not detected in meiofauna. The assemblage compositions varied temporally, and the responses to beach modification were specific to the taxon or the faunal groups studied. As coastal structures become more common, environmentally sustainable beach management must address the ecological impacts of modifying beach habitats and minimize changes to surrounding hydrodynamic and sediment properties.