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Public Perception, Tidal Flood, Hazards, Vulnerability Assessment

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Public Perception, Tidal Flood, Hazards, Vulnerability Assessment Marine Science 2013, 3(3): 91-99 DOI: 10.5923/j.ms.20130303.04 Public Perception of Tidal Flooding Hazards on Bonny Island, Rivers State; Nigeria Akuro E. Gobo1,*, Gordon T. Amangabara2, Williams.W. Pepple 1 1Institute of Geosciences and Space Technology, (IGST), Rivers State University of Science and Technology P.M.B. 5080, Port Harcourt, Nigeria 2Department of Environmental Technology, Federal University of Technology, P.M.B. 1526 Owerri, Nigeria Abstract International research efforts by organizations such as IPCC have revealed past trend of global warming and its future. Based on these estimates, there is justifiable expectation that climate change and sea-level rise could cause a wide range of impacts on coastal zones; some of the typical impacts identified are coastal erosion/ increased flood risk, and impacts on infrastructure. The current study analysed public perceptions of tidal flood hazards on Bonny Island, Rivers State; Nigeria. The focus of the study was to identify the most vulnerable areas on the Island to the tidal inundation as well as assess the local community adaptive capacity to the tidal surge. Based on a recognizance survey, we administered 270 questionnaires to 15 identified communities on the Island that constantly experience tidal floods. Results from the study showed that nearly two-third of the respondents (67.6%) in our study area had good knowledge of the causes, time of occurrence and impact of tidal flood on Bonny Island; that the flood coincides with the spring tides during the raining season which is responsible for its severity occasioned by the building of shanty-type houses within the waterfront and the swamp area resulting in flood pondages that can last for several days; The time it takes the floodwater to totally recede according to 77% of the people is 12hrs 45mins. Loss of life, household property, business time, sicknesses resulting from flood ponds that breed diseases vectors etc are some of the impacts reported by the people. The study also showed that there are no effective mitigation and adaptation strategy put in place in the event of a catastrophic ocean surge. No early warning, no community education as a result respondents show a great level of indifference to the impact caused by the flood by their attitude and lack preparedness. Keywords Public perception, Tidal flood, Hazards, Vu lnerability assessment, Okrika, Bolo, Bonny Island causing loss of human life and damages to property[4, 5, 6] 1. Introduction about one third of all deaths, one third of all injuries and one third of all damage from natural disasters are attributable to Flooding is the most common of all environmental flood[3]. hazards and it regularly claims over 20,000 lives per year and Flood also has its benefit if properly and efficiently adversely affects around 75 million people world-wide[1]. managed[7]. Floods can occur due to intense, long duration The reason lies in the widespread geographical distribution rainfall events[8] and also as a result of extremely high over of river floodplains and low-lying coasts, together with their bank discharge from rivers and other water bodies[9]. In the long standing attractions for human settlement[2]. Death and literature, different types of floods that occur in the Niger destruction due to flooding continue to be all too common Delta have been identified e.g. urban floods, flash floods, phenomena throughout the world today, affect ing millions of channel floods, Back-swamp floods and coastal inundation/ people annually; Thus, The International Decade for Natural tidal floods[5]. However, the prevalent flood event that poses Disaster Reduction (IDNDR) was launched by the General serious threat to life and property on Bonny Island is tidal Assembly of the United Nations in 1987 to run from 1990 to floods. This occurs when the sea level rises to a critical 2000. With the aim of reducing the loss of life, property height above the coastal lands with weak defences especially damage, social and economic disruption caused by natural during the raining season and at periods of astronomical disasters[3]. The resolution proclaiming the Decade makes spring tides and inundates settlements[9,10]. It is an annual specific reference to flood, tsunamis, drought and event affecting most Niger Delta communities like Port desertification among the principal disasters to be considered. Harcourt, Yenagoa, Okrika, Bolo, Opobo, Buguma in Rivers As already stated flood is a devastating phenomenon State; Twon-Brass, Igbematuru, Olugbobiri and Peremabiri in Bayelsa State amongst others. * Corresponding author: [email protected] (Akuro E. Gobo) Outside the Niger Delta of Nigeria, tidal flood is reported Published online at http://journal.sapub.org/ms to occur at Victoria Island, Lagos; Nigeria[11]. Globally, Copyright © 2013 Scientific & Academic Publishing. All Rights Reserved more than 100 million people are at risk of tidal flooding[12] 92 Akuro E. Gobo et al.: Public Perception of Tidal Flooding Hazards on Bonny Island, Rivers State; Nigeria countries like the Maldives, an archipelago of nearly 1196 Harcourt and on the leeward side of the Cameroon Mountain. low-lying islands[13], China, Honduras, Thailand[14,15], It is the Administrative Headquarters of Bonny Local Mauritius[16] and many coastal cities in the Mediterranean, Government Areas of Rivers State, Nigeria (Figures 2 and 3) pacific, Atlantic, Australia and the Indian ocean are at risk. Grand Bonny, Finima, Opusunju, Kala Sunju, Green International research efforts such as IPCC have revealed Iwoama and Kalaibiama are the major communities that past trend of global warming and its future, there is make up the Island. The Island lies on the Lat. 4o27N and justifiable expectation that climate change and sea-level rise Long 7o10E with an estimated population of 270,000[18]. (according to[17] sea-level rise at Bonny is 1mm per annum) The Island has a relatively flat topography on an elevation of could cause a wide range of impacts on the coastal zones; 3.05 atmospheric mean sea level with a total land area of some of the typical impacts identified are coastal erosion, 214.52m2[19] with about 70% of its size suffering from tidal increased flood risk, and impacts on infrastructure. flooding and land subsidence. The geology of the area Many regions of the world have commenced vulnerability comprises basically of alluvial sedimentary basin and assessments of the coastal areas. Vulnerability Assessment basement complex. The sub strata of the island consist (VA) is essentially an analysis of the scope and severity of mainly of fine sands, down to about 10m with occasional the potential effects of a disaster, in this case coastal flooding. clay layers. This encompasses the assessment of both anticipated According to[20] Bonny Island has lost about 1,793.24 impacts and available adaptation options. At present a km2 of coastline between 1986 and 2006 with a greater region-wide vulnerability assessment for the Asia and percentage (76.62%) of this loss occurring between 1986 and Pacific region has been initiated. Africa is perhaps, the only 2001 coinciding with the massive constructions of NLNG, continent where no serious effort is presently on-going. expansion of Shell export terminal and other anthropogenic Our existing knowledge on the vulnerability of coastal influences as a result of influx to the small Island. areas to tidal/coastal flooding vis –a-vis sea-level rise is poor Bonny Island is basically a rain forest vegetation area with and scattered, but all the evidence points to a severe impact brackish mangrove forest vegetation established at the banks potential. This raises fundamental questions which are of the Bonny River and its tributaries. The greater northern pertinent to the United Nations Framework Convention on half up to the east of Bonny Town, next to the Opobo Climate Change (UNFCCC) about the ability of different Channel is mainly mangroves, and lies just above sea level nations and regions to adapt to sea-level rise. (Figure 3). The southern part lies higher and contains The main objective of this study therefore was to highlight typically (degraded) freshwater swamp forests, in some the areas on Bonny island that are most vulnerable to the places mixed with mangrove, open swamp, dry land tidal inundation while the specific objectives were to 1) rainforest or dune slacks[21]. The southern Atlantic coast of assess and describe disaster preparedness behaviour among Bonny Island encompasses a beach ridge barrier and a sandy the people of the island and 2) the island adaptation capacity beach. The coastal situation is characterized by a large, 20 to the tidal surge; as understanding the impact of flood km wide, offshore sand bank: the Bonny Bar. It protects the hazard to local community and people‟s response to hazard coastline against ocean currents and waves. The island itself are essential to addressing issues of concrete action in coastal hazard management. Research has shown that people with is dissected by several creeks. better knowledge and preparedness behaviour could help in The tidal flood on Bonny Island causes inundation on the preventing the severe losses and damages. However, there coastal settlement. The sea water area is extending to the have been no studies conducted to identify the level of land (as a result of the accompanying coastal erosion) knowledge, behaviour and perception of the rural people leading to the loss of land and change to the coastline[20]. towards disaster preparedness in the country. Hence, by Resultant impacts include damages to structures, loss of lives studying the level of knowledge and disaster preparedness and property, decreasing environmental quality which behaviour among rural islanders in Bonny will help enhances health problem, e.g., malaria and yellow fever[22, authorities to take measures to mitigate and prevent tidal 23, and 24].
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