Numerical modelling of sediment transport in southwest coast of Nigeria: Implications for sustainable management of coastal erosion in the Bight of Benin

Badru, Gbolahan; Odunuga, Shakirudeen; Omojola, Ademola; Oladipo, E. O.

doi:10.1016/j.jafrearsci.2022.104466

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…The noticeable accretion in the western section of the coast is due to the longshore drift of sediment from the Barrier-Lagoon coast from Lagos, rising sea levels, and the deposition of sand and other sediments along the shore. Little bits of erosion noticeable in the western section was due to human activities such as canalization and the deforestation of mangroves (Badru et al, 2022). The eastern sector of the shore zone even with little erosion experienced more land loss due to sea-level rise as the region's topography is low-lying ranging between 0.5 and 2 meters.…”

Section: Discussionmentioning

confidence: 99%

“…The coastal zone is occasionally submerged, due to the action of tides and waves moving sediments inside, outside, and within the nearshore zone (Mentaschi et al, 2018). Coastal areas are some of the world's most productive and biologically diverse ecosystems (Badru et al, 2022). The shoreline is the interface between the land and the sea, and it is always in a state of flux due to sediment transportation and coastal/marine processes (Kankara et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

Popoola

2022

ESJ

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This study investigated changes due to erosion and the consequences of rising sea levels on the Transgressive mud coast of Nigeria using multispectral Landsat images and ALOS PALSAR (AW3D30) elevation models with the view of proffering a management strategy for a sustainable coast. Endpoint Rate (EPR) and Linear Regression Rate (LRR) techniques within the Digital Shoreline Analysis System (DSAS) were used to assess the rates of changes along the shoreline between 1986 and 2021. Inundation models were developed in line with sea-level rise scenarios of the Green House Gas emissions (SSP5-8.5) with GIS to assess sea-level rise’s impact on land and structures. Likewise, spatially disaggregated population and economic activity datasets projected to the year 2100 were overlaid on the inundation models to generate exposure indices for the coast. The study revealed that 49.8 km (64.67%) of the shoreline experienced retreat over the entire study period. This rapid rate of shoreline retreat has caused a land loss of 15.1 sq. km to the Atlantic over the last 35 years, which could trigger an additional 1.26 sq. km by the year 2032. Furthermore, the impact of sea-level rise is severe on the transgressive coast triggering submergence of the mud coast by inundation to the extent of 201 sq. km which will increase to 551 sq. km by 2100. Losses in terms of structures, population, and economic activity are recorded. To curtail the ongoing coastal changes, the study recommends the full adoption of the shoreline management plan (SMP) for sustainable shoreline management.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

Popoola

2022

ESJ

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“…The MIKE modeling system simulates shallow‐water processes over complex bathymetry (Osorio‐Cano et al., 2019; Warren & Bach, 1992). However, few surfzone studies have included the ST module (Badru et al., 2022; Cáceres et al., 2016; Petropoulos et al., 2022; Valipour & Bidokhti, 2018; Valipour et al., 2014) or compared the model with field measurements of morphological changes. The SW module simulates the wave transformation based on either a fully spectral (FS) or directional decoupled (DD) formulation solving the wave action conservation equation (Komen et al., 1994) or a parameterization hereof (Holthuijsen et al., 1989).…”

Section: Field Study and Model Setupmentioning

confidence: 99%

The Roles of Bathymetry and Waves in Rip‐Channel Dynamics

Christensen,

Raubenheimer,

Elgar

2024

JGR Earth Surface

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The behavior and predictability of rip currents (strong, wave‐driven offshore‐directed surfzone currents) have been studied for decades. However, few studies have examined the effects of rip channel morphology on the rip generation or have compared morphodynamic models with observations. Here, simulations conducted with the numerical morphodynamic model MIKE21 reproduce observed trends in flows and bathymetric evolution for two channels dredged across a nearshore sandbar and terrace on an ocean beach near Duck, NC, USA. Channel dimensions, wave conditions, and flows differed between the two cases. In one case, a strong rip current was driven by moderate height, near‐normally incident waves over an approximately 1‐m deep channel with relatively little bathymetric evolution. In the other case, no rip was generated by the large, near‐normally incident waves over the shallower (∼0.5 m) channel, and the channel migrated in the direction of the mean flow and eventually filled in. The model simulated the flow directions, the generation (or not) of rip currents, and the morphological evolution of the channels reasonably well. Model simulations were then conducted for different combinations of the two channel geometries and two wave conditions to examine the relative importance of the waves and morphology to the rip current evolution. The different bathymetries were the dominant factor controlling the flow, whereas both the initial morphology and wave conditions were important for channel evolution. In addition, channel dimensions affected the spatial distribution of rip current forcings and the relative importance of terms.

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“…Increased turbidity also affects the transport of nutrients and contaminants adsorbed to the clay particles. This decline in environmental quality continues to occur along with increasing natural pressure and anthropogenic activities [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the Malacca Strait and Siak River, although the main current circulation consistently moves to the north of the Malacca Strait, pollutants move seasonally along with the monsoon [ [8] , [9] , [10] ]. On the other hand, the hydrodynamics of currents accelerates the erosion process on the beach, indicating that sediment movement is dependent on currents [ 4 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Suspended sediment transport generated by non-hydrostatic hydrodynamics in Northern Waters of Aceh, Indonesia

Setiawan

Haditiar

Syukri

et al. 2023

Heliyon

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Numerical modelling of sediment transport in southwest coast of Nigeria: Implications for sustainable management of coastal erosion in the Bight of Benin

Cited by 10 publications

References 25 publications

Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

Spatio-Temporal Assessment of Shoreline Changes and Management of the Transgressive Mud Coast, Nigeria

The Roles of Bathymetry and Waves in Rip‐Channel Dynamics

Suspended sediment transport generated by non-hydrostatic hydrodynamics in Northern Waters of Aceh, Indonesia

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