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Assessment of Land Use/Land Cover Change and Morphometric Parameters in the Keta Lagoon Complex Ramsar Site, Ghana
Water ( IF 3.4 ) Pub Date : 2021-09-16 , DOI: 10.3390/w13182537
Eric Duku , Precious Agbeko Dzorgbe Mattah , Donatus Bapentire Angnuureng

The rapid urbanization, industrialization, agricultural activities, and increasing trend of some natural hazards, such as climate change, particularly in coastal areas, necessitate the continual assessment of critical but fragile ecosystems like that of the Keta Lagoon Complex Ramsar Site (KLCRS). This productive ecosystem in Ghana faces serious threats from intensive exploitation, physical modification, changes in water regime, and water pollution. The current study employed geospatial and intensity analysis to assess the pattern of land use/land cover (LULC) change for almost the past three decades and morphometric parameters of the KLCRS landscape. Landsat Satellite images for 1991, 2007, and 2020 were acquired to uncover the pattern of LULC change, while morphometric changes were assessed using global Advance Space Thermal Emission and Radiometer (ASTER) digital elevation model (DEM) data and the spatial analyst tools in GIS software. The result established that the acceleration of land transformation was intensive between 2007 and 2020, which could be linked to population growth and increased socio-economic activities. There was a net gross gain of built-up that originated largely from the conversion of marsh, dense vegetation, and cultivated land. Prior to this period, cultivated land recorded net gain (125.51 km2) between 1991 and 2007, whereas dense vegetation and marshland showed a net loss of 151.37 km2 and 2.44 km2, respectively. The gain of cultivated land largely targeted marshland in both time intervals. The construction of saltpans contributed largely to the small increase in water extent. The morphometric analysis revealed the groundwater potential of the KLCRS. The low-lying nature of the landscape makes the area susceptible to coastal flooding. The trend of the observed changes could invariably affect the ecological integrity of the landscape, hence suggesting the need for immediate preparation and implementation of marine and coastal spatial plans by relevant stakeholders.

中文翻译:

加纳 Keta Lagoon Complex Ramsar 遗址的土地利用/土地覆盖变化和形态参数评估

快速的城市化、工业化、农业活动以及一些自然灾害(如气候变化)的增加趋势,特别是在沿海地区,需要不断评估关键但脆弱的生态系统,如 Keta Lagoon Complex Ramsar Site (KLCRS)。加纳这个多产的生态系统面临着来自集约开发、物理改造、水情变化和水污染的严重威胁。目前的研究采用地理空间和强度分析来评估几乎过去三十年的土地利用/土地覆盖 (LULC) 变化模式和 KLCRS 景观的形态测量参数。获取了 1991、2007 和 2020 年的 Landsat 卫星图像以揭示 LULC 变化的模式,同时使用全球先进空间热辐射和辐射计 (ASTER) 数字高程模型 (DEM) 数据和 GIS 软件中的空间分析工具评估形态学变化。结果表明,2007 年至 2020 年期间土地转型的加速是密集的,这可能与人口增长和社会经济活动的增加有关。建成区的净总收益主要来自沼泽、茂密植被和耕地的转化。在此之前,耕地净增(125.51 km 建成区的净总收益主要来自沼泽、茂密植被和耕地的转化。在此之前,耕地净增(125.51 km 建成区的净总收益主要来自沼泽、茂密植被和耕地的转化。在此之前,耕地净增(125.51 km2 ) 1991 年至 2007 年,而茂密的植被和沼泽地的净损失分别为 151.37 km 2和 2.44 km 2。在两个时间段内,耕地的增加主要针对沼泽地。盐田的建设在很大程度上促成了水量的小幅增加。形态测量分析揭示了 KLCRS 的地下水潜力。景观的低洼性质使该地区容易受到沿海洪水的影响。观察到的变化趋势总是会影响景观的生态完整性,因此表明相关利益相关者需要立即准备和实施海洋和沿海空间规划。
更新日期:2021-09-16
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