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Geospatial assessment of ecosystem health of coastal urban wetlands in Ghana
Ocean & Coastal Management ( IF 4.6 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ocecoaman.2020.105226
Bernard Ekumah , Frederick Ato Armah , Ernest K.A. Afrifa , Denis Worlanyo Aheto , Justice Odoiquaye Odoi , Abdul-Rahaman Afitiri

Abstract A comprehensive assessment of ecosystem health of wetlands is needed to guide protection and restoration activities. However, the conventional methods used in evaluating ecosystem health of wetlands largely rely on field observational data which often do not provide spatio-temporal perspectives to the assessment. Geospatial assessment of remotely sensed data has enormous potentials for assessing ecosystem health of wetlands at different temporal and spatial scales. This study employed geospatial techniques to assess ecosystem health of Densu Delta, Sakumo II and Muni-Pomadze Ramsar Sites over a 32-year period using structure, function and resilience indicators. Landsat satellite images of 1985, 2002 and 2017 were obtained for this study. Analytic hierarchy process (AHP) was used to weight the indicators. The importance of the ecosystem health indicators in decreasing order was as follows: Structure > Resilience > Function. The findings of the study also indicated that ecosystem health of the wetlands progressively deteriorated in 2002 and 2017 compared to the reference year of 1985. In 2002, the Densu Delta experienced the least decline (11.8%) from the 1985 state among the three wetlands and Sakumo II recorded the highest deterioration (38.0%). Unlike 2002, in 2017 the health of the Densu Delta experienced the worse deterioration (46.3%) whereas Sakumo II recorded the least decline (26.2%). Ecosystem health of Muni-Pomadze Ramsar Site deteriorated at a similar magnitude, 27.0% and 29.1% in 2002 and 2017, respectively. The critical underlying factor for the degradation of the wetlands is urbanization largely due to increase in human population which led to the expansion of built-up areas in the wetlands, fragmentation of natural land use and land cover (LULC) classes and reduction of vegetation cover.

中文翻译:

加纳沿海城市湿地生态系统健康的地理空间评估

摘要 需要对湿地生态系统健康进行综合评估,以指导保护和恢复活动。然而,用于评估湿地生态系统健康的传统方法在很大程度上依赖于实地观察数据,这些数据通常不能为评估提供时空视角。遥感数据的地理空间评估对于评估不同时空尺度的湿地生态系统健康具有巨大的潜力。本研究采用地理空间技术,使用结构、功能和复原力指标评估 Densu Delta、Sakumo II 和 Muni-Pomadze Ramsar Sites 32 年期间的生态系统健康状况。本研究获得了 1985、2002 和 2017 年的 Landsat 卫星图像。采用层次分析法(AHP)对指标进行加权。生态系统健康指标的重要性按降序排列如下:结构>恢复力>功能。研究结果还表明,与 1985 年基准年相比,2002 年和 2017 年湿地的生态系统健康状况逐渐恶化。 2002 年,在三个湿地和Sakumo II 记录了最高的恶化(38.0%)。与 2002 年不同的是,2017 年电寿三角洲的健康状况恶化(46.3%),而佐云二号的下降幅度最小(26.2%)。Muni-Pomadze Ramsar Site 的生态系统健康状况恶化幅度相似,分别在 2002 年和 2017 年恶化了 27.0% 和 29.1%。
更新日期:2020-08-01
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