Long-term spatiotemporal analysis of coastline morphological evolutions and their underlying mechanisms in the Pearl River Delta region of China

IF 4.8 2区环境科学与生态学 Q1 OCEANOGRAPHY

Ocean & Coastal Management Pub Date : 2024-10-13 DOI:10.1016/j.ocecoaman.2024.107426

Zihao Ning , Changbo Jiang , Jie Chen , Zhiyuan Wu , Zhen Yao , Yuan Ma , Tianan Deng , Yulin Chen

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Abstract

The coastline, the important geographical components bordering the land and ocean, reflects abundant information on morphological evolutions. However, it undergoes continuous changing due to the compound effects of both natural and anthropogenic factors with varying intensities. Changes in the coastline are important indicators of coastal erosion, environmental changes in the coastal zone, and the rise and fall of ecosystems. The Pearl River Delta (PRD) region is rich in coastline resources, and the coastal evolution is extremely active with natural and human activities. In order to uncover the underlying mechanisms of the coastline evolutions in the PRD region, we quantitatively and qualitatively characterized the long-term alterations in coastline length, coastal development/decline, morphological structure, and the exploitation extent based on 9 satellite images of Landsat spanning from 1973 to 2021. Furthermore, we explored the driving factors of coastline change, with a view to providing some theoretical basis for the development, utilisation, protection and management of coastal resources and the sustainable development of the ecological environment in the PRD region. The findings reveal an outward expansion of coastline, resulting in a 587.49 km² increase of new land over the past 48 years. In addition, the total coastline length in this region has grown from 1477.93 to 1604.72 km, with artificial coastline contributing 61.55%, while the number of fractal dimensions suggest the further growth of coastline. Furthermore, the cause analysis identifies the morphological evolution in PRD as a multi-factor dynamic process following a “ternary-multivariate-single” pattern. Moreover, the population, GDP, precipitation, and sand transport are defined as the primary drivers, with socio-economic impacts overweighing natural conditions, and the interaction of any two drivers is greater than the effect of a single factor.

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中国珠江三角洲地区海岸线形态演变及其内在机理的长期时空分析

海岸线是陆地和海洋交界的重要地理组成部分，反映了丰富的形态演变信息。然而，由于自然因素和人为因素的复合影响，海岸线也在不断地发生变化，而且强度不一。海岸线的变化是海岸侵蚀、海岸带环境变化和生态系统兴衰的重要标志。珠江三角洲（PRD）地区海岸线资源丰富，海岸演化在自然和人类活动中异常活跃。为了揭示珠江三角洲地区海岸线演变的内在机制，我们基于 1973 年至 2021 年的 9 幅 Landsat 卫星图像，定量和定性地描述了海岸线长度、海岸发展/衰退、形态结构和开发程度的长期变化。此外，我们还探讨了海岸线变化的驱动因素，以期为珠三角地区海岸资源的开发、利用、保护和管理以及生态环境的可持续发展提供一些理论依据。研究结果表明，过去 48 年来，珠三角地区海岸线向外扩张，新增陆地面积达 587.49 平方公里。此外，该地区的海岸线总长度从 1477.93 千米增加到 1604.72 千米，其中人工海岸线占 61.55%，而分形维数则表明海岸线将进一步增长。此外，成因分析认为珠三角的形态演变是一个多因素的动态过程，呈现 "三元-多元-单一 "的模式。此外，人口、GDP、降水量和输沙量被定义为主要驱动因素，社会经济影响大于自然条件影响，任何两个驱动因素的相互作用都大于单一因素的影响。

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来源期刊

Ocean & Coastal Management 环境科学-海洋学

CiteScore

8.50

自引率

15.20%

发文量

321

审稿时长

60 days

期刊介绍： Ocean & Coastal Management is the leading international journal dedicated to the study of all aspects of ocean and coastal management from the global to local levels. We publish rigorously peer-reviewed manuscripts from all disciplines, and inter-/trans-disciplinary and co-designed research, but all submissions must make clear the relevance to management and/or governance issues relevant to the sustainable development and conservation of oceans and coasts. Comparative studies (from sub-national to trans-national cases, and other management / policy arenas) are encouraged, as are studies that critically assess current management practices and governance approaches. Submissions involving robust analysis, development of theory, and improvement of management practice are especially welcome.