An investigative study on the volume of sediment accumulation in Tagwai dam reservoir using bathymetric and geostatistical analysis techniques

Abstract

Sustainable provision of potable water for domestic, industrial and development purposes in Minna has been elusive over the years due to several factors, including lack of spatial database (locations, depth, area, volume, etc.) and the threat by siltation and land use activities within the corridors of the reservoir area. This paper utilizes the data collected from fieldwork to investigate the volume of sediment accumulated in Tagwai reservoir basin over a period of 31 years since the dam was constructed in 1978. Sediment accumulation study in a dam is one of the useful methods of gathering information needed for its monitoring, maintenance, and sustainability. Leica TC1201 (total station) was used for perimeter survey, while Raytheon DE-119 (echo sounder) was adopted for depth measurement. A comparison was made between the designed reservoir volume (28.3 × 10 6 m 3) and the computed volume (20.4 × 10 6 m 3). A loss of about (7.9 × 10 6 m 3) was recorded. Sediment accumulation gave 0.25 Mm 3 , a spread of about (0.80%) annually. Prediction and error analysis was done using geostatistical methods of Kriging/Co-kriging and Empirical Bayesian Kriging in ArcGIS software. The predicted root mean square errors are 0.0963 and 0.1189 for both methods which presented a good representation while testing with other available methods. It can be concluded that the storage capacity of the reservoir is depleting which has further exacerbated the shortage of water experienced in Minna metropolis therefore, urgent attention for de-silting is highly recommended.

Evaluation of ANFIS Predictive Ability Using Computed Sediment from Gullies and Dam

“…Note, that water level measurement may not pose a problem with the RTK technique, but when it is taken, it can be used for verification or validation purposes. We computed the volume of sediment accumulated in the dam using equation 1 [39]. Table 2, contains the technical parameters of the Hi-Target Marine HD-Max Echo Sounder, while Table 3 provides the summary of the total volume of sediment accumulated in the dam for the three years investigated.…”

Hydroelectric Power Plants and River Morphodynamic Processes

“…The knowledge about the topography of the erosion and accumulation processes taking place within the channel is of paramount importance for a hydraulic engineer (Graf 1998;Kiraga 2020) The hydrotechnical development disturbs the equilibrium state of the river channel by altering the water surface gradient and depth, and therefore the water flow velocity and sediment transport capacity. The return to equilibrium river sediment transport conditions is accomplished by gradual sediment accumulation, which affects the lifetime of the reservoir (A in Figure 7) as well as its ongoing operation (Schleiss et al 2016;Oladosu et al 2019). The development of a river channel usually results in a narrowing of its cross-section and changes in the flow conditions, which are particularly visible during catastrophic floods, when the basic hydrodynamic parameters of a stream are increased many times.…”

Sedimentation Analysis on Seyhan Dam Reservoir Using Long Term Bathymetry Data

“…Diaconu et al (2019) emphasized that determining the bathymetric properties of rivers, lakes, and reservoirs enables the identification of areas experiencing sedimentation or erosion. Over the years, bathymetric surveys and mapping have been extensively conducted to gather information about the bottom surfaces of reservoirs (Szatten et al, 2018;Sandoval-Erazo et al, 2018;Oladosu et al, 2019;Lopes and de Araújo, 2019), oceans, and sea floors (Weatherall et al, 2015), as well as rivers (Bandini et al, 2018;Legleiter et al, 2018), lakes (Gopakumar and Takara, 2009;Cross and Moore, 2014;Maina et al, 2019), coastal areas (Salameh et al, 2019), and other water bodies. These efforts aim to investigate water depths, changes in underwater topography, sediment accumulation, and potential environmental impacts.…”