A Preliminary Assessment of the Effects of Climate Variability on Agulu Lake, Anambra State, Nigeria

Nzoiwu, Chukwudi P.; Ezenwaji, Emma E.; Okoye, Anthony C.

doi:10.4236/ajcc.2017.64035

Cited by 4 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result shows an increase in evaporation for the months of March to May and October to November and a decrease in evaporation during the months of June, July, August and September from 1960 to 2016. The similarity observed between Evaporation and temperature models reiterate the result of the correlation between the two variables and re-emphasize the extent of influence of the temperature factor on evaporation on the pond (Nzoiwu et al, 2017). At the monthly scale, the analysis of the hydrological balance parameters makes it possible to distinguish two periods: a dry period and a wet period.…”

Section: Monthly Evolution Of Some Parameterssupporting

confidence: 53%

See 1 more Smart Citation

Effects of Hydroclimatic Variability on the Spatial Dynamics of Ponds (Simenti, Kountadala and Oudassi) of the Gambia River Basin in the Niokolo Koba National Park (Senegal)

Faye

Solly

Sane

et al. 2019

International Journal of Geography and Geology

View full text Add to dashboard Cite

With climate change, West African watercourses have undergone profound changes with large runoff deficits, faster dryings and very severe low flows. These modifications have led to a sharp decrease in water resources and a drying up of some water bodies. This article evaluated the effects of hydroclimatic variability on the spatial dynamics of a few ponds (Simenti, Kountadala and Oudassi) in the Gambia Basin in the Niokolo Koba National Park, NKNP, (Senegal). Data from five sets of images are used for pond trend mapping (Landsat, Google Earth and Sentinel). The hydroclimatic data used in this study include precipitation, temperature, evaporation, and discharge data from the Gambia Basin subjected to trend (Mann-Kendall) and rupture (Pettitt) tests. The results show that the trend is positive and significant for temperatures and evaporation and negative and significant for precipitation at a 95% confidence level. The surface area of the ponds, from 40.3 ha in 1975, increased sharply to 79.3 ha in 1988, then rose slightly in 1999 with 80.2 ha and in 2010 with 83.4 ha before to shrink sharply from 67.8 ha in 2019 due to rainfall deficit and the expansion of aquatic vegetation. Recommendations were made on how to improve the problem. Faced with the scarcity and drying up of water in these ponds of Niokolo Koba Park, water transfer operations such as those noted with the Simenti pond to save animals, remain fundamental according to some conservatives. Contribution/Originality: This study contributes to the exist literature by evaluating the effects of hydroclimatic variability on the spatial dynamics of a few ponds (Simenti, Kountadala and Oudassi) in the Gambia Basin in the Niokolo Koba National Park, NKNP, (Senegal). 1. INTRODUCTION Lakes and ponds are major repositories of biodiversity and provide multiple ecosystem services (Politi et al., 2012). These are vital resources for aquatic wildlife and human needs. Any change in their environmental quality and water renewal rate has far-reaching ecological and societal consequences (Vincent, 2009). Lakes and ponds are widely recognized as key indicators of environmental change. They exhibit remarkable variability over time in their morphometric, physical, chemical and biological characteristics (Omondi et al., 2014). These variations are mainly driven by climate change and human activities in their watershed. Ponds are strongly influenced by regional and global climate change in the short and long term (Nzoiwu et al., 2017). Their water level varies according to the precipitation / evaporation ratio, the groundwater inflow, the water abstraction rate and other factors. Therefore,

show abstract

Section: Monthly Evolution Of Some Parameterssupporting

confidence: 53%

“…This change in precipitation and temperature that accompanies climate change has the potential to alter the connectivity of ponds with biological implications (eg for migratory fish species), changes in volume, area, and pond depth, as well as other related limnological properties (Nzoiwu et al, 2017).…”

mentioning

confidence: 99%

Effects of Hydroclimatic Variability on the Spatial Dynamics of Ponds (Simenti, Kountadala and Oudassi) of the Gambia River Basin in the Niokolo Koba National Park (Senegal)

Faye

Solly

Sane

et al. 2019

International Journal of Geography and Geology

View full text Add to dashboard Cite

show abstract

“…These variations are mainly driven by climate change and human activities in their watershed. Ponds are strongly influenced by regional and global climate change in the short and long term (Nzoiwu et al, 2017). Their water level varies according to the precipitation / evaporation ratio, the groundwater inflow, the water abstraction rate and other factors.…”

mentioning

confidence: 99%

“…Thus, Ayoade (1975) also pointed out that an accurate assessment of the water resources of any region requires knowledge not only of the extent of rainfall and its spatial and temporal distribution, but also of the nature and magnitude loss of water by evaporation. This change in precipitation and temperature that accompanies climate change has the potential to alter the connectivity of ponds with biological implications (eg for migratory fish species), changes in volume, area, and pond depth, as well as other related limnological properties (Nzoiwu et al, 2017).…”

mentioning

confidence: 99%

Untitled

2019

International Journal of Geography and Geology

View full text Add to dashboard Cite

With climate change, West African watercourses have undergone profound changes with large runoff deficits, faster dryings and very severe low flows. These modifications have led to a sharp decrease in water resources and a drying up of some water bodies. This article evaluated the effects of hydroclimatic variability on the spatial dynamics of a few ponds (Simenti, Kountadala and Oudassi) in the Gambia Basin in the Niokolo Koba National Park, NKNP, (Senegal). Data from five sets of images are used for pond trend mapping (Landsat, Google Earth and Sentinel). The hydroclimatic data used in this study include precipitation, temperature, evaporation, and discharge data from the Gambia Basin subjected to trend (Mann-Kendall) and rupture (Pettitt) tests. The results show that the trend is positive and significant for temperatures and evaporation and negative and significant for precipitation at a 95% confidence level. The surface area of the ponds, from 40.3 ha in 1975, increased sharply to 79.3 ha in 1988, then rose slightly in 1999 with 80.2 ha and in 2010 with 83.4 ha before to shrink sharply from 67.8 ha in 2019 due to rainfall deficit and the expansion of aquatic vegetation. Recommendations were made on how to improve the problem. Faced with the scarcity and drying up of water in these ponds of Niokolo Koba Park, water transfer operations such as those noted with the Simenti pond to save animals, remain fundamental according to some conservatives. Contribution/Originality:This study contributes to the exist literature by evaluating the effects of hydroclimatic variability on the spatial dynamics of a few ponds (Simenti, Kountadala and Oudassi) in the Gambia Basin in the Niokolo Koba National Park, NKNP, (Senegal). INTRODUCTIONLakes and ponds are major repositories of biodiversity and provide multiple ecosystem services (Politi et al., 2012). These are vital resources for aquatic wildlife and human needs. Any change in their environmental quality and water renewal rate has far-reaching ecological and societal consequences (Vincent, 2009). Lakes and ponds are widely recognized as key indicators of environmental change. They exhibit remarkable variability over time in their morphometric, physical, chemical and biological characteristics (Omondi et al., 2014). These variations are mainly driven by climate change and human activities in their watershed. Ponds are strongly influenced by regional and global climate change in the short and long term (Nzoiwu et al., 2017). Their water level varies according to the precipitation / evaporation ratio, the groundwater inflow, the water abstraction rate and other factors. Therefore,

show abstract

“…A lot of studies on the effects of climate change had been done in various ecosystems such as climate variability in lakes [12] (Nzoiwu et al 2017), climate change impacts in crops and croplands in agro ecosystems [13] [14] as well as influence of climate change in land cover dynamics within the river basins which include mangrove, forest, beach, tidal areas, lagoon, river, settlements, barren salt areas and findings revealed that climate change is intensified by rapid urbanization in these ecosystems [14]. The current study did not in any way duplicate these earlier studies and would in fact use the results of recent studies including those cited above to validate the climate change risks and suitability of selected agri-aqua commodities as climate resilient livelihood options for selected communities in the country.…”

Section: Introductionmentioning

confidence: 99%

Climate Change Impacts and Vulnerability Assessment of Selected Municipalities and Agroecosystems to Support Development of Resilient Communities and Livelihoods in Nueva Ecija, Philippines

Paz-Alberto¹,

Dios²,

Alberto³

et al. 2018

AJCC

View full text Add to dashboard Cite

In the last decade, the Philippines had been hit severely by natural disasters brought about by climate change which caused great damages to agriculture. The objectives of the study were to assess climate change impacts and vulnerability of Bongabon, Gabaldon and Cabanatuan City, Nueva Ecija; to assess the vulnerability and suitability of growing various crops, goats and chicken; to generate vulnerability and suitability maps; and to validate the maps produced. A comprehensive scoping, profiling, vulnerability assessment and crop, chicken and goat suitability assessment of the municipalities and agroecosystems of the study sites was done. Generation and validation of the vulnerability and suitability maps were also conducted. Results revealed that Bongabon obtained moderate vulnerability to floods and typhoon while low vulnerability to drought and soil erosion. Gabaldon had moderate vulnerability to floods, soil erosion and drought while low vulnerability to typhoon. Cabanatuan City attained moderate vulnerability to floods and drought while low vulnerability to typhoon. There were four crops suitable to grow in the current condition with flood and landslide hazards and in the two projected future scenarios (RCP 4.5 with good conditions and RCP 8.5 with the worst conditions). Only three crops are highly suitable to grow in Gabaldon for the future conditions while in Cabanatuan City four crops are very suitable for the three situations. Native chicken and goats are highly suitable to raise in the three study sites for the three conditions. There were 16 vulnerability maps developed and generated in Bongabon, 16 in Gabaldon and only 12 in Cabanatuan City. Furthermore, 21 crop, chicken and goat suitability maps were produced in Bongabon, 27 maps in Gabaldon and 21 maps in Cabanatuan City. Overall, validation of the maps in the study sites had high accuracy.

show abstract

A Preliminary Assessment of the Effects of Climate Variability on Agulu Lake, Anambra State, Nigeria

Cited by 4 publications

References 23 publications

Effects of Hydroclimatic Variability on the Spatial Dynamics of Ponds (Simenti, Kountadala and Oudassi) of the Gambia River Basin in the Niokolo Koba National Park (Senegal)

Effects of Hydroclimatic Variability on the Spatial Dynamics of Ponds (Simenti, Kountadala and Oudassi) of the Gambia River Basin in the Niokolo Koba National Park (Senegal)

Untitled

Climate Change Impacts and Vulnerability Assessment of Selected Municipalities and Agroecosystems to Support Development of Resilient Communities and Livelihoods in Nueva Ecija, Philippines

Contact Info

Product

Resources

About