Grupo de Geografía Física y Medio Ambiente, Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Spain.
Beach and Dune Systems (BEADS) Laboratory, College of Science and Engineering, Flinders University, South Australia, Australia.
Sci Total Environ. 2019 Dec 1;694:133768. doi: 10.1016/j.scitotenv.2019.133768. Epub 2019 Aug 6.
Foredunes are formed by aeolian sand deposition in vegetation on the backshore of beaches. In this paper, the foredune mode (nebkha, discontinuous foredune, and continuous foredune), and transgressive dunefield development is studied along the Great Australian Bight (GAB), 2668 km of coastline. Orthophotos are used to classify the foredune mode, coastal landforms and the vegetation, through geographic information systems (GIS), with fieldwork support. The results show that the foredune mode is strongly controlled by rainfall and temperature with respect to latitude, and to drift potential with respect to longitude across the GAB. Between 200 and 300 mm annual rainfall, nebkha predominate. When the annual rainfall is between 300 and 400, at latitude 32°, a clear pattern is not observed in foredune mode and this is identified as a transition zone. Discontinuous foredunes and continuous foredunes are strongly represented in regions experiencing above 400 mm annual rainfall. The main contribution of this study is the identification of foredune modes which are not only related to a climatic gradient and latitude, but also related to variations in longitude, vegetation cover and diversity, and dune mobility indices. Finally, there are other environmental relationships between the wind and longitude, where the geomorphology of the bay could be playing an important role.
风成沙丘是在海滩后滨植被中由风沙沉积形成的。本文研究了大澳大利亚湾（GAB）2668公里长的海岸线上的前沙丘模式（新月形沙丘、不连续前沙丘和连续前沙丘）和海侵沙丘场的发育。正射影像通过地理信息系统（GIS）进行分类，辅以实地工作，对前沙丘模式、沿海地貌和植被进行分类。结果表明，前沙丘模式主要受纬度相关的降雨和温度以及经度相关的漂移势控制。年降雨量在 200 至 300 毫米之间时，新月形沙丘占主导地位。当年降雨量在 300 至 400 毫米之间，在 32°纬度时，前沙丘模式没有明显的模式，这被确定为过渡带。年降雨量超过 400 毫米的地区，不连续前沙丘和连续前沙丘的分布更为明显。本研究的主要贡献是确定了前沙丘模式，这些模式不仅与气候梯度和纬度有关，还与经度变化、植被覆盖和多样性以及沙丘移动指数有关。最后，风与经度之间还有其他环境关系，海湾的地貌可能起着重要作用。
