Geospatial assessment of ecosystem health of coastal urban wetlands in Ghana

Ekumah, Bernard; Armah, Frederick Ato; Afrifa, Ernest K. A.; Aheto, Denis Worlanyo; Odoi, Justice O.; Afitiri, Abdul-Rahaman

doi:10.1016/j.ocecoaman.2020.105226

Cited by 56 publications

(22 citation statements)

References 29 publications

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“…Similar to the findings of a previous study [66], the small increase in water coverage in KLCRS during 1991-2020 was partly due to the increased construction of saltpans and ponds around the Keta Lagoon, particularly at the northeastern section of the Ramsar Site. This was directly observed from the field survey, as part of the lagoon, specifically at Kedzi, Afiadenyigba, and Adina, was used for salt production.…”

Section: Discussionsupporting

confidence: 87%

Assessment of Land Use/Land Cover Change and Morphometric Parameters in the Keta Lagoon Complex Ramsar Site, Ghana

Duku

Mattah

Angnuureng

2021

Water

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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.

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Section: Discussionsupporting

confidence: 87%

Assessment of Land Use/Land Cover Change and Morphometric Parameters in the Keta Lagoon Complex Ramsar Site, Ghana

Duku

Mattah

Angnuureng

2021

Water

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“…So much so that 50% of the wetlands in the Mediterranean region have disappeared since 1970 (Anonymous, 2022a). However, the degradation and destruction of wetlands, one of the most productive and important ecosystems in the world, is a serious threat to biodiversity (Ekumah et al, 2020;Ashok et al, 2021;Paul and Pal, 2020). In this context, habitat monitoring, evaluation and conservation activities are critical to support the conservation of biodiversity (Ludwig et al, 2019;Teng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Changes of Lake Uluabat Ramsar Site and Its Surroundings in the 1985-2021 Period Using Rs and Gis Methods

2022

Global NEST: The International Journal

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<p>Ramsar sites are important ecosystems that are protected by international status, have great value in terms of biodiversity, and constitute a resource in terms of economic, cultural, scientific and recreational aspects. In this study, the change of Lake Uluabat Ramsar Site and its surroundings, between the years 1985-2021 has been observed. For this, Remote Sensing (RS) and Geographic Information Systems (GIS) methods were used. Vegetation change in the lake and its surroundings in 1985, 2000, 2015 and 2021 with Normalized Difference Vegetation Index (NDVI), and changes in water surfaces with the water indices Normalized Difference Water Index (NDWI) and Modified Normalized Difference Water Index (mNDWI) were analyzed by using Landsat multi-band satellite images (Landsat 5 TM, Landsat 7 ETM and Landsat 8 OLI/TIRS) as RS data. The resulting changes were monitored and the success of the indices in determining these areas and the relations of the indices with each other were questioned by Accuracy index, Kappa coefficent, and Correlation analyses. The results show 36-year long-term changes and reveal a 13.06% shrinkage of Uluabat Lake wetland and surrounding water areas with the highest kappa coefficients for mNDWI as 0.83, 0.90, 0.93, 0.97, respectively, over the years studied.</p>

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“…2) Area of interest. Prior literature on urban green development has covered single cities or city agglomerations (clusters) [11]- [15], provinces (autonomous regions) [16], [17], watersheds, coastal waters, lakes, wetlands [18]- [24], townships and rural areas [25], [26]. 3) Research methods.…”

Section: Introductionmentioning

confidence: 99%

Energy-Consumption-Based Comprehensive Evaluation of Urban Green Development—Cases of 27 Cities in the Integrated Central Area of the Yangtze River Delta, China

2021

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The evaluation of urban green development from the perspective of energy consumption is an important issue of regional sustainable development. This paper takes 27 cities in the central region of Yangtze River Delta of China as samples to construct its comprehensive evaluation index system. Based on the relevant data of the sample area from 2005 to 2017, the paper adopts the combination weighting model of translation correction and preference calculation, and comprehensively uses Moran's I index analysis method to explore the time series and spatial distribution pattern of green development in the sample area. The results show the following. (1) The influencing factors of green development in the study area show that the influence degree of three factors increases, and the influence degree of one factor decreases, and the weight gap gradually decreased, which demonstrated the concept of ecological priority balanced development. (2) Xuancheng, Taizhou and Nantong are in good condition. Secondly, Wuhu, Ma'anshan, the current situation and trend of energy consumption and urban development need to pay attention. Shanghai and Zhejiang Province are in good condition, while Anhui Province is low in energy utilization efficiency and needs to be improved. (3) The sample areas showed "high-high" or "low-low" agglomeration, and Moran's I index showed a downward trend. The coordination degree of sustainable development of urban agglomeration in this region was gradually improved and the energy consumption structure was constantly optimized. The conclusion of this paper can provide decision support for the sustainable development of eco-green integration in the Yangtze River Delta region. The problem of energy consumption and urban development is global and universal. Therefore, the research perspective and method of this paper are of important reference value. INDEX TERMS combination weighting method, comprehensive evaluation, energy consumption, Yangtze River Delta integrated central areaThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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Geospatial assessment of ecosystem health of coastal urban wetlands in Ghana

Cited by 56 publications

References 29 publications

Assessment of Land Use/Land Cover Change and Morphometric Parameters in the Keta Lagoon Complex Ramsar Site, Ghana

Assessment of Land Use/Land Cover Change and Morphometric Parameters in the Keta Lagoon Complex Ramsar Site, Ghana

Monitoring the Changes of Lake Uluabat Ramsar Site and Its Surroundings in the 1985-2021 Period Using Rs and Gis Methods

Energy-Consumption-Based Comprehensive Evaluation of Urban Green Development—Cases of 27 Cities in the Integrated Central Area of the Yangtze River Delta, China

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