Cohesive and non-uniform sediment characteristics in the unlined canal of Chókwè Irrigation Scheme, Mozambique

Sousa, Lateiro Salvador de; Wambua, Raphael M.; Raude, James M.; Mutua, Benedict M.

doi:10.1007/s43217-021-00058-3

Cited by 3 publications

(1 citation statement)

References 51 publications

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“…The opposite scenario was observed for the Conhane sampling station, which had the lowest water levels (de Sousa et al, 2019(de Sousa et al, , 2020. Interestingly, at this sampling station, in contrast to the others, the lowest water levels were observed at their extreme points on the east and west sides of the cross-section (de Sousa et al, 2021;Ondruch et al, 2018).…”

Section: Water Depth Variationmentioning

confidence: 71%

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Sousa

Raude

Wambua

et al. 2022

Irrigation and Drainage

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Bathymetric changes have been observed over the years in the Chókwè irrigation scheme (CIS) and little is known about their cause. This study assessed bathymetric variations that have occurred since 2001, when the scheme was last rehabilitated. The bathymetry of canal beds and banks was analysed using GPS‐Rover surveying equipment to determine cross‐section and longitudinal profiles. Water level measurements were performed using staff gauges at nine different sampling stations. Data sets for 2001, 2016 and 2019 were considered. Canal depth changes were captured, and density plots generated. Bathymetric changes of cross‐sectional and longitudinal profiles, slope trend analysis models, canal depth changes and water depth variation, were assessed. Results suggest cross‐sectional and longitudinal bathymetric profiles are affected by sediment accumulation. The depths of canal beds varied from 0.5 to 2.0 m over a span of more than 80 km. Trend analysis models indicated good accuracy for fits in all three reaches in 2001, 2016 and 2019. The forecast accuracy predictors MAPE, MAD and MSD were all found to have minimal values within the acceptable range of 1 and 3 for all the years and sectors. The water depth in the canal showed considerable variation within and across each sampling point and station, varying from 3.5 to less than 1.2 m. These findings will play a significant role in the study of water flow and sedimentation processes in the CIS.

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Section: Water Depth Variationmentioning

confidence: 71%

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Sousa

Raude

Wambua

et al. 2022

Irrigation and Drainage

Self Cite

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Hydrodynamic modelling to develop design and operational options for sedimentation reduction in irrigation schemes, Ethiopia

Gurmu,

Ritzema,

de Fraiture

et al. 2024

Journal of Hydrology: Regional Studies

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Numerical simulation of the GPSD with different Length-to-Width ratios in dynamic water environment

Song,

Ding,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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The gill-piece separation device (GPSD) is small, compact, and cost-effective in agricultural irrigation. To explore the influence of different length-to-width ratios on the water-sand two-phase flow field in the GPSD, numerical simulations of the velocity field and concentration field in the GPSD with different length-to-width ratios are conducted in a dynamic water environment by using the CFX software with the mixture model and RNG k – ε model. By comparing and analyzing the computational results, it is found that compared to the length-to-width ratios of 1:1, 2:1, and 3:1, the environment inside the gill-piece separation device with a ratio of 4:1 is more stable, and the formation of countercurrents is more pronounced; under dynamic water conditions, as the length-to-width ratio increases, the separation efficiency of the GPSD for water and sand increases. Among them, the water-sand separation efficiency of the GPSD with a ratio of 4:1 is the highest, reaching 90.41%, which is 2.26, 1.25, and 1.11 times higher than those of the ratios 1:1, 2:1, and 3:1, respectively.

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Cohesive and non-uniform sediment characteristics in the unlined canal of Chókwè Irrigation Scheme, Mozambique

Cited by 3 publications

References 51 publications

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Bathymetry changes caused by sedimentation in an unlined canal of the Chókwè irrigation scheme, Mozambique

Hydrodynamic modelling to develop design and operational options for sedimentation reduction in irrigation schemes, Ethiopia

Numerical simulation of the GPSD with different Length-to-Width ratios in dynamic water environment

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