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Mapping spatial variability in shoreline change hotspots from satellite data; a case study in southeast Australia
Estuarine, Coastal and Shelf Science ( IF 2.6 ) Pub Date : 2020-09-19 , DOI: 10.1016/j.ecss.2020.107018
Teresa M. Konlechner , David M. Kennedy , Julian J. O'Grady , Chloe Leach , Roshanka Ranasinghe , Rafael C. Carvalho , Arjen P. Luijendijk , Kathleen L. McInnes , Daniel Ierodiaconou

This study demonstrates how a large-scale satellite-derived dataset can be used to investigate statistically robust trends in shoreline position over a 31-year period from 1987 to 2017, at a regional scale. Regional patterns of shoreline behaviour are important for resolving consistent or, alternatively, dissimilar patterns of past shoreline change. Such patterns are best explored using temporally frequent and spatially extensive datasets. Here we analyse satellite-derived shorelines to identify spatial patterns of hotspots of coastline change on the wave-exposed coast of Victoria in south-east Australia where rates of change exceed 0.5 m yr−1. Analysis of shoreline position changes at a 50 m alongshore interval along 900 km of the 1230 km coastline reveals a number of distinct behaviours related to coastal type (rock vs sand coast), landform, shoreline orientation and/or anthropogenic drivers of change. Overall the results show that statistically significant change in shoreline position has affected only a relatively small proportion of the study region over the last 31 years; that the proportion and rate of progradational and recessional change is similar; and that change is localised but dispersed widely along the Victorian coast. Coasts located at the entrances to large tidal inlets have shown the greatest change. The association of hotspots with embayed sandy beaches and adjacent to headlands points to the importance of geological control on shoreline behaviour. Consistent with other regional scale studies of shoreline change, this study found little regional coherence in shoreline behaviour. Instead change is predominately attributed to local factors such as the geological framework of the coast, localised hydrodynamic conditions and anthropogenic influences. Collectively, these results indicate that there is strong geologic control on shoreline erosion in Victoria due to the high diversity of landforms along the coastline; and that further analysis is required to tease out the seasonal to interannual sensitivities to changes in the historical wave climate and the secondary interaction of sediment supply for headlands and hydrodynamics for tidal inlets.



中文翻译:

根据卫星数据绘制海岸线变化热点的空间变异性;澳大利亚东南部的一个案例研究

这项研究演示了如何使用大规模的卫星数据集来研究区域范围(1987年至2017年)31年间海岸线位置的统计稳健趋势。海岸线行为的区域模式对于解决过去海岸线变化的一致或替代模式非常重要。最好使用时间频繁和空间广泛的数据集来探索此类模式。在这里,我们分析了来自卫星的海岸线,以识别在澳大利亚东南部维多利亚的波曝露海岸上海岸线变化热点的空间格局,那里变化率超过0.5 m yr -1。对1230公里海岸线900公里中沿海岸间隔50 m的海岸线位置变化进行的分析揭示了许多与海岸类型(岩石与沙质海岸),地形,海岸线取向和/或人为变化驱动因素有关的行为。总体而言,结果表明,在过去31年中,海岸线位置的统计学显着变化仅影响了相对较小的研究区域比例。渐进变化和衰退变化的比例和速度相似;这种变化是局部的,但在维多利亚州沿海却广泛分布。大型潮汐进口入口处的海岸变化最大。热点与埋没的沙滩和临近岬角的联系指出了对海岸线行为进行地质控制的重要性。与其他有关海岸线变化的区域规模研究一致,本研究发现海岸线行为几乎没有区域一致性。相反,变化主要归因于当地因素,例如海岸的地质框架,局部水动力条件和人为影响。总的来说,这些结果表明,由于沿岸地貌的高度多样性,维多利亚州对海岸线侵蚀具有强有力的地质控制;并且需要进行进一步分析,以弄清季节性变化对年际波浪变化的敏感性,以及对海岬角的沉积物供应和潮汐流的水动力的二次相互作用。相反,变化主要归因于当地因素,例如海岸的地质框架,局部水动力条件和人为影响。总的来说,这些结果表明,由于沿岸地貌的高度多样性,维多利亚州对海岸线侵蚀具有强有力的地质控制;而且还需要进一步分析,以弄清对历史波浪气候变化的季节性和年际敏感性,以及对岬角的沉积物供应和潮流入口的水动力的二次相互作用。相反,变化主要归因于当地因素,例如海岸的地质框架,局部水动力条件和人为影响。总的来说,这些结果表明,由于沿岸地貌的高度多样性,维多利亚州对海岸线侵蚀具有强有力的地质控制;并且需要进行进一步分析,以弄清季节性变化对年际波浪变化的敏感性,以及对海岬角的沉积物供应和潮汐流的水动力的二次相互作用。这些结果表明,由于沿岸地貌的高度多样性,维多利亚州对海岸线侵蚀具有强大的地质控制作用;而且还需要进一步分析,以弄清对历史波浪气候变化的季节性和年际敏感性,以及对岬角的沉积物供应和潮流入口的水动力的二次相互作用。这些结果表明,由于沿岸地貌的高度多样性,维多利亚州对海岸线侵蚀具有强大的地质控制作用;而且还需要进一步分析,以弄清对历史波浪气候变化的季节性和年际敏感性,以及对岬角的沉积物供应和潮流入口的水动力的二次相互作用。

更新日期:2020-10-02
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