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福建海岸活力特性及其评价研究

Characteristics and evaluation of living shoreline vitality in Fujian

  • 摘要: 全球气候变化背景下,海平面上升和风暴潮事件的频发给沿海地区带来严峻的挑战,如何保护海岸免受侵蚀,防止社会经济财产损失,维持海岸带生态系统平衡是海岸带持续发展不可忽视的问题。基于自然解决方案(nature-based solution, NbS)的活力海岸构建技术,采用近自然的生态修复和保护措施,在低能岸段以天然材料独立实现,高能岸段辅以人工措施,在实现海岸防灾减灾功能的同时,维持海岸带自然生态系统的稳定性,提升生态功能,挖掘海岸活力潜能。本研究采用熵权法,构建了福建省海岸活力评价体系,从防护安全、生态韧性和经济发展3个方面,结合福建海岸带2010年和2020年两期数据比较,开展海岸活力评价研究。结果显示,福建海岸活力呈现北低、中高、南较低的初始状态,活力值为0.20~0.67(数字越大活力越强);近十年海岸带生态修复工程的实施,使福建海岸活力整体趋势向好发展,高活力岸段明显增多,福建中部和南部活力海岸变优趋势整体优于北部。水体质量、气旋指数、生物岸线长度、湿地面积等因子对海岸活力特性的影响最为显著,基于NbS理念的海岸开发利用方式和丰富的软质护岸保护亦产生良好的生态效益和经济活力。海岸活力的提升应采用因地制宜的方式,合理、高效利用海岸带资源,结合区域生态价值和经济产值的优化,构建发展模式的海岸活力评价体系,为海岸防护能力、生态活力、经济潜力的可持续发展提供科学依据。

     

    Abstract: In the context of global climate change, sea level rise and frequent storm surge events have brought severe challenges to coastal areas, how to protect the coast from erosion, prevent the loss of socio-economic property and maintain the balance of the coastal zone ecosystem are issues that cannot be ignored for the sustainable development of coastal zones. The living shoreline technology based on nature-based solution (NbS) using near-natural ecological restoration and protection measures are realized independently with natural materials in the low-energy shoreline and/or supplemented with artificial measures in the high-energy shoreline. Meanwhile, the functions of coastal disaster prevention and mitigation are realize, the stability and ecological function of the natural ecosystems in the coastal zones maintained and the potential of shoreline vitality agitated. In this paper, the entropy weight method was used to construct living shoreline vitality evaluation system in Fujian Province, and the vitality evaluation was carried out in three aspects, i.e. protection safety, ecological resilience and economic development, and the data of 2010 and 2020 from the same areas were compared. Results showed that the living shoreline vitality in the study area showed an initial state with vitality value of 0.20~0.67 (the higher the number, the stronger the vitality). However, the value is low in the northern area and is middle high and low in the south. In the past ten years, the implementation of coastal ecological restoration projects has improved the coastal vitality overall in the study area and it increased significantly in a number of high-vitality coastal sections. The overall improvement trend of the central and southern coastal vitality is better than that in the northern part. Water quality, cyclone index, biological shoreline length, wetland area and other factors have the most significant impacts on shoreline vitality characteristics. Coastal development and utilization based on the NbS and abundant soft revetment protection also produce good ecological benefits and economic vitality. The improvement of living shoreline vitality should adopt the method according to local conditions for rational and efficient use of coastal resources. Combining both the optimization of regional ecological value and economic output value is necessary to construct living shoreline vitality evaluation system of development model and provide a scientific basis for the sustainable development of protection capacity, ecological vitality and economic potential.

     

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