Seamless topo-bathymetric surveys of Maiyegun Estate Waterfront Lagos State, Nigeria

Abstract

Topo-bathymetric surveys are mostly desired in coastal area where water and land perpetually interact. This work explore the ground-based methods of topographic and bathymetric surveys in collecting data for the appropriate description of the Mayegun Estate water front and the adjoining land topography. To acquire depth data at pre-defined transects lines, hydrographic vessel and a trained diver were engaged. The topo-bathy DEM was produced at 1m and contour at 0.5m interval. The wave pattern was determined to be semi-diurnal. The fitted second order polynomial regression equation for wave amplitude against time yielded (y = 2E-07x2 - 0.0003x - 0.0276 at R² = 0.0064) while that of depth versus sounded points gave (y = 5E-09x2 - 5E-06x - 7.1512) at R² = 0.0019. The vertical and horizontal uncertainties were computed as 0.015m and 5m + (-0.47) at 95% confidence level based on (IHO) specification for order 1a. This principle can be adopted with caution as a viable alternative for topo-bathy surveys to minimize cost.

Bathymetric survey and volumetric analysis of Bakolori dam reservoir North West Nigeria

“…It is worthy to note that there is no previous research on the volumetric analysis of Bakolori dam reservoir since it was commissioned in 1983, this necessitates comprehensive research to unearth its current hydro-volume capacity against the backdrop of its initial capacity, in order to forestall any future adverse effect that may cripple the existence of Bakolori irrigation program. As such lack of attention to the deteriorating capacities of Nigerian reservoirs and its implications to acquire water for irrigation and water supply need [15,16]. This study used a bathymetric survey technique to investigate how the Bakolori reservoir's sedimentation has changed over time.…”