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Management of Coastal Erosion by Creating Large-Scale and Small-Scale Sediment Cells
COASTAL EROSION CONTROL BASED ON THE CONCEPT OF SEDIMENT CELLS by L. C. van Rijn, www.leovanrijn-sediment.com, March 2013 1. Introduction Nearly all coastal states have to deal with the problem of coastal erosion. Coastal erosion and accretion has always existed and these processes have contributed to the shaping of the present coastlines. However, coastal erosion now is largely intensified due to human activities. Presently, the total coastal area (including houses and buildings) lost in Europe due to marine erosion is estimated to be about 15 km2 per year. The annual cost of mitigation measures is estimated to be about 3 billion euros per year (EUROSION Study, European Commission, 2004), which is not acceptable. Although engineering projects are aimed at solving the erosion problems, it has long been known that these projects can also contribute to creating problems at other nearby locations (side effects). Dramatic examples of side effects are presented by Douglas et al. (The amount of sand removed from America’s beaches by engineering works, Coastal Sediments, 2003), who state that about 1 billion m3 (109 m3) of sand are removed from the beaches of America by engineering works during the past century. The EUROSION study (2004) recommends to deal with coastal erosion by restoring the overall sediment balance on the scale of coastal cells, which are defined as coastal compartments containing the complete cycle of erosion, deposition, sediment sources and sinks and the transport paths involved. Each cell should have sufficient sediment reservoirs (sources of sediment) in the form of buffer zones between the land and the sea and sediment stocks in the nearshore and offshore coastal zones to compensate by natural or artificial processes (nourishment) for sea level rise effects and human-induced erosional effects leading to an overall favourable sediment status. -
Urban Governance and Turning African Ciɵes Around: Lagos Case Study
Advancing research excellence for governance and public policy in Africa PASGR Working Paper 019 Urban Governance and Turning African CiƟes Around: Lagos Case Study Agunbiade, Elijah Muyiwa University of Lagos, Nigeria Olajide, Oluwafemi Ayodeji University of Lagos, Nigeria August, 2016 This report was produced in the context of a mul‐country study on the ‘Urban Governance and Turning African Cies Around ’, generously supported by the UK Department for Internaonal Development (DFID) through the Partnership for African Social and Governance Research (PASGR). The views herein are those of the authors and do not necessarily represent those held by PASGR or DFID. Author contact informaƟon: Elijah Muyiwa Agunbiade University of Lagos, Nigeria [email protected] or [email protected] Suggested citaƟon: Agunbiade, E. M. and Olajide, O. A. (2016). Urban Governance and Turning African CiƟes Around: Lagos Case Study. Partnership for African Social and Governance Research Working Paper No. 019, Nairobi, Kenya. ©Partnership for African Social & Governance Research, 2016 Nairobi, Kenya [email protected] www.pasgr.org ISBN 978‐9966‐087‐15‐7 Table of Contents List of Figures ....................................................................................................................... ii List of Tables ........................................................................................................................ iii Acronyms ............................................................................................................................ -
Spatial Knowledge and Flood Preparedness in Victoria Island, Lagos, Nigeria
Jàmbá - Journal of Disaster Risk Studies ISSN: (Online) 1996-1421, (Print) 2072-845X Page 1 of 11 Original Research Spatial knowledge and flood preparedness in Victoria Island, Lagos, Nigeria Authors: There is inadequate flood preparedness in Victoria Island, Lagos, Nigeria; because when 1 Abdullateef Bako the flood struck on 08 July 2017, several properties were destroyed without any extant Saeed K. Ojolowo2 means to salvage them. This article investigated the relationship between spatial Affiliations: knowledge and flood preparedness in Victoria Island. The variables employed to measure 1Department of Urban and spatial knowledge include knowledge of: elevation of land, distance between Lagos lagoon Regional Planning, Faculty of and Atlantic Ocean, characteristics of surrounding water bodies and building–plot ratio. Environmental Sciences, University of Ilorin, Kwara Major roads were used to subdivide Victoria Island into four zones. Zone A had 799 State, Nigeria buildings, zone B had 813 buildings, zone C had 749 buildings and zone D had 887 buildings. Of the total 3248 buildings, 344 buildings were selected, and one household 2Department of Urban and head per building was selected and systematically sampled. A multinomial logit regression Regional Planning, Faculty of model was used in data analysis at p ≤ 0.05. The findings revealed that spatial knowledge Environmental Design and Management, University of accounted for only 25.8% of the explanation of inadequate flood preparedness. Only 6.1% Ibadan, Oyo State, Nigeria of the respondents could distinguish height from elevation; those who explained density and setbacks correctly were 7.85% and 12.2%, respectively. Respondents who stated the Corresponding author: distance between Lagos lagoon and Atlantic Ocean correctly and exhibited means of Saeed Ojolowo, [email protected] preparedness were 13.7%, respectively. -
Socio-Ecological Metabolisms of Eko Atlantic City, Lagos, Nigeria: an Unjust City?
Socio-Ecological Metabolisms of Eko Atlantic City, Lagos, Nigeria: An Unjust City? Joseph Adeniran Adedeji Department of Architecture, Federal University of Technology, Akure, Nigeria Abstract My aim in this paper is to examine the socio-ecological metabolisms involved in the production processes of Eko Atlantic City (EAC) in Lagos, Nigeria with a view to suggesting an adaptable metabolism framework based on political ecology. This is consequent upon the continually perceived ailments of this capitalist urbanisation project on the majority poor populace. Results suggest the major components of the framework to include capitalism, neoliberalism, authoritarianism, class differentiation, socio-spatial segregation, and socio-ecological disorganisation, all in the name of climate change adaptation. It concludes by advocating for strategies for framing a truly democratic and inclusive urban governance at EAC. What is the city and what forces frame its identity? Developmental mega-city projects can illuminate our understanding and guide a re-thinking of the actual meaning of the city. An evaluation of the process of recovering the ocean space to construct the 10-million square meter Eko Atlantic City (EAC) in Lagos, Nigeria, can help us redefine the city with the lenses of political ecology and social justice. The EAC is a large-scale urbanisation project that leaves a plethora of questions in inquisitive minds, especially given the project’s lopsided proceeds destined for the upper class. It has been christened a climate change adaptation project, but the larger quest borders on adaptation for whom? The discourse in the paper is structured in three parts to answer the following questions: 1) what is the socio-ecological inclusiveness of this oceanscape before the inception of EAC; 2) what are the dominant narratives in the literature on the Urban Socio-Ecological Metabolisms (USEM) that continue to trail the conception and birth of EAC; and 3) to what extent has EAC charted the course for a new urban vocabulary beyond neoliberalism to produce a new USEM framework. -
1 the Influence of Groyne Fields and Other Hard Defences on the Shoreline Configuration
1 The Influence of Groyne Fields and Other Hard Defences on the Shoreline Configuration 2 of Soft Cliff Coastlines 3 4 Sally Brown1*, Max Barton1, Robert J Nicholls1 5 6 1. Faculty of Engineering and the Environment, University of Southampton, 7 University Road, Highfield, Southampton, UK. S017 1BJ. 8 9 * Sally Brown ([email protected], Telephone: +44(0)2380 594796). 10 11 Abstract: Building defences, such as groynes, on eroding soft cliff coastlines alters the 12 sediment budget, changing the shoreline configuration adjacent to defences. On the 13 down-drift side, the coastline is set-back. This is often believed to be caused by increased 14 erosion via the ‘terminal groyne effect’, resulting in rapid land loss. This paper examines 15 whether the terminal groyne effect always occurs down-drift post defence construction 16 (i.e. whether or not the retreat rate increases down-drift) through case study analysis. 17 18 Nine cases were analysed at Holderness and Christchurch Bay, England. Seven out of 19 nine sites experienced an increase in down-drift retreat rates. For the two remaining sites, 20 retreat rates remained constant after construction, probably as a sediment deficit already 21 existed prior to construction or as sediment movement was restricted further down-drift. 22 For these two sites, a set-back still evolved, leading to the erroneous perception that a 23 terminal groyne effect had developed. Additionally, seven of the nine sites developed a 24 set back up-drift of the initial groyne, leading to the defended sections of coast acting as 1 25 a hard headland, inhabiting long-shore drift. -
Environmental and Social Impact Assessment of the Eko Atlantic Shoreline Protection and Reclamation Project- a Summary
ENVIRONMENTAL AND SOCIAL IMPACT ASSESSMENT OF THE EKO ATLANTIC SHORELINE PROTECTION AND RECLAMATION PROJECT- A SUMMARY The Eko Atlantic Shoreline Protection and Reclamation Project will provide approximately 1000 hectares (ha) of high quality land for development within the heart of Lagos, Nigeria and will offer a long-term solution to the shoreline erosion problems at Victoria Island, Lagos. Coastal Protection and the Development of a Future Modern City in Lagos, Nigeria. Project Location South Energyx Nigeria Ltd (SENL) was specifically created to undertake the development of the Eko Atlantic Project. Key elements of the management structure of SENL have a distinguished track record in Nigeria for the successful completion of major construction and engineering works. The Project site is located adjacent to Bar Beach, at Victoria Island, Lagos, within the Eti-Osa Local Government Area. The Need for the Eko Atlantic Project Protection: The shoreline of Victoria Island has retreated significantly over the past century. The main cause for this erosion began with the blocking of coastal sediment transport after the construction of two moles or breakwaters (between 1908 and 1912) at the entrance to the Port of Lagos. Coastal protection activity was frequently commissioned to reduce the erosion threat to Victoria Island, including several nourishment schemes. However, those attempts only temporarily mitigated the erosion and there continued to be intermittent flooding in this coastal area. The erosion culminated in 2006, when the protective beach disappeared with resultant flood damage to the road infrastructure along Bar Beach. The images presented below illustrate the situation in 2006. With no action, highly valued areas of residential and commercial property would continue to have been threatened by intrusion of sea water. -
Guidance for Flood Risk Analysis and Mapping
Guidance for Flood Risk Analysis and Mapping Coastal Notations, Acronyms, and Glossary of Terms May 2016 Requirements for the Federal Emergency Management Agency (FEMA) Risk Mapping, Assessment, and Planning (Risk MAP) Program are specified separately by statute, regulation, or FEMA policy (primarily the Standards for Flood Risk Analysis and Mapping). This document provides guidance to support the requirements and recommends approaches for effective and efficient implementation. Alternate approaches that comply with all requirements are acceptable. For more information, please visit the FEMA Guidelines and Standards for Flood Risk Analysis and Mapping webpage (www.fema.gov/guidelines-and-standards-flood-risk-analysis-and- mapping). Copies of the Standards for Flood Risk Analysis and Mapping policy, related guidance, technical references, and other information about the guidelines and standards development process are all available here. You can also search directly by document title at www.fema.gov/library. Coastal Notation, Acronyms, and Glossary of Terms May 2016 Guidance Document 66 Page i Document History Affected Section or Date Description Subsection Initial version of new transformed guidance. The content was derived from the Guidelines and Specifications for Flood Hazard Mapping Partners, Procedure Memoranda, First Publication May 2016 and/or Operating Guidance documents. It has been reorganized and is being published separately from the standards. Coastal Notation, Acronyms, and Glossary of Terms May 2016 Guidance Document 66 -
Mathematical Model of Groynes on Shingle Beaches
HR Wallingford Mathematical Model of Groynes on Shingle Beaches A H Brampton BSc PhD D G Goldberg BA Report SR 276 November 1991 Address:Hydraulics Research Ltd, wallingford,oxfordshire oxl0 gBA,United Kingdom. Telephone:0491 35381 Intemarional + 44 49135381 relex: g4gsszHRSwALG. Facstunile:049132233Intemarional + M 49132233 Registeredin EngtandNo. 1622174 This report describes an investigation carried out by HR Wallingford under contract CSA 1437, 'rMathematical- Model of Groynes on Shingle Beaches", funded by the Ministry of Agri-culture, Fisheries and Food. The departmental nominated. officer for this contract was Mr A J Allison. The company's nominated. project officer was Dr S W Huntington. This report is published on behalf of the Ministry of Agriculture, Fisheries and Food, but the opinions e>rpressed are not necessarily those of the Ministry. @ Crown Copyright 1991 Published by permission of the Controller of Her Majesty's Stationery Office Mathematical model of groSmes on shingle beaches A H Brampton BSc PhD D G Goldberg BA Report SR 276 November 1991 ABSTRACT This report describes the development of a mathematical model of a shingle beach with gro5mes. The development of the beach plan shape is calculated given infornation on its initial position and information on wave conditions just offshore. Different groyne profiles and spacings can be specified, so that alternative gro5me systems can be investigated. Ttre model includes a method for dealing with varying water levels as the result of tidal rise and fall. CONTENTS Page 1. INTRODUCTION I 2. SCOPEOF THE UODEL 3 2.t Model resolution and input conditions 3 2.2 Sediment transport mechanisms 6 2.3 Vertical distribution of sediment transport q 2.4 Wave transformation modelling L0 3. -
Shoreline Stabilisation
Section 5 SHORELINE STABILISATION 5.1 Overview of Options Options for handling beach erosion along the western segment of Shelley Beach include: • Do Nothing – which implies letting nature take its course; • Beach Nourishment – place or pump sand on the beach to restore a beach; • Wave Dissipating Seawall – construct a wave dissipating seawall in front of or in lieu of the vertical wall so that wave energy is absorbed and complete protection is provided to the boatsheds and bathing boxes behind the wall for a 50 year planning period; • Groyne – construct a groyne, somewhere to the east of Campbells Road to prevent sand from the western part of Shelley Beach being lost to the eastern part of Shelley Beach; • Offshore Breakwater – construct a breakwater parallel to the shoreline and seaward of the existing jetties to dissipate wave energy before it reaches the beach; and • Combinations of the above. 5.2 Do Nothing There is no reason to believe that the erosion process that has occurred over at least the last 50 years, at the western end of Shelley Beach, will diminish. If the water depth over the nearshore bank has deepened, as it appears visually from aerial photographs, the wave heights and erosive forces may in fact increase. Therefore “Do Nothing” implies that erosion will continue, more structures will be threatened and ultimately damaged, and the timber vertical wall become undermined and fail, exposing the structures behind the wall to wave forces. The cliffs behind the wall will be subjected to wave forces and will be undermined if they are not founded on solid rock. -
The Case-Study of Fongafale, Atool of Funafuti
Shoreline of human-impacted coralline atolls: need for a concerted management. The case-study of Fongafale, atoll of Funafuti, Tuvalu Caroline Rufin The atoll of Funafuti (Tuvalu archipelago) is located in the South Pacific Ocean at latitude 8.31° South and longitude 179.13° East (Figure 1). According to its morphology, Fongafale island (atoll of Funafuti) can be split into three distinct geographical areas, i.e. the northern, central and southern parts. The present study deals with the central part, which results from the deposition of sediments from the two other areas following North and South longshore drifts. Marshall •• Islands, 1o·N Kiribati! . ~ ~· ... ' ... .. ·. ~ Samoa .. o_. •• Vanuatu b •! ; . b\ Fiji ,::::1 . ~ 0 Tonga .. ' '· : .... 2o·s New .. ~.'•. ' •• Caledon~. • • • 100· 110· 180' 170' 160"W Source : from Mclean et Hosking. 1991 Figure 1 Localisation of Tuvalu within the Pacific Bassin. 436 Coral reefs in the Pacifie: Status and monitoring, Resources and management Through the example of Fongafale island, the present study is aimed at thinking about the manage ment of low coralline islands confronted with erosion problems most often in relation with excessive coastal planning. This thought will be developed in terms of global geography while taking into account ail the environmental conditions. Our purpose will be not to demonstrate which of the two factors, Man or Nature, is the more disturb ing. However, from the analysis of our data set it is clear that the contribution of the former is greater than that of the latter. We will first draw a schedule of Fongafale lagoon shoreline from aerial pictures and topographical readings; it will be essential to understand the environmental problems which this atoll is submitted to. -
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COMMERCIAL PROPERTIES the Devil Is in the Detail It Is During Our Darkest Moments That We Must Focus to See the Light
REFINED One6 Temple PostSquare Tower Greystone Nestoil Tower Tower 1 2 3 4 5 Strategy Vs Lease Competence Lease Clauses Time Renewal and Expertise Transaction COMMERCIAL PROPERTIES The Devil is in the detail It is during our darkest moments that we must focus to see the light. - Aristotle - COLLABORATION; The New Competition WE SHOWED NIGERIA TO THE WORLD COLLABORATING FOR FINANCIAL PROG- RESS In October 2017, as the recession gradually ebbed, Fine & Country in partnership with other vi- The Finer Wealth Club is a gender-based initia- sionary businesses; Business Day, Eko Atlantic, tive of Fine & Country to give a unique access for Landmark Africa took the audacious step to show women interested in investing in real estate- from Nigeria to the world- with a distinguished repre- entry level first timers to astute investors who al- sentation of properties and projects. Our objective ready have a growing portfolio. This women-only was clear; educate, inspire & ignite the confidence investment club presents a unique opportunity for of Nigerians in the Diaspora. We were honored resource platform for women and their families to with the presence of industry leaders & real estate gain access to trusted real estate insight and op- experts at the Landmark Hotel in London, UK. portunities, and to achieve better returns through Fine & Country had on display several profitable collaboration. & iconic projects- from the Eko Atlantic; a first of its kind in the industry to the Greystone Towers; The Club was launched on March 1st at The Fin- with its signature organic & warm glass façade; the ery, Ikoyi and aims to build a community of wom- Diaspora investors were very impressed with the en with shared vision, shared valued & shared projects on display as we got interests & commit- profit.