ORCID Profile
0000-0003-2150-6396
Current Organisations
Universiti Putra Malaysia
,
Cihan University-Erbil
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Publisher: Springer Science and Business Media LLC
Date: 17-04-2019
Publisher: Wiley
Date: 07-10-2021
DOI: 10.1002/IRD.2530
Publisher: MDPI AG
Date: 22-03-2020
DOI: 10.3390/SU12062490
Abstract: Earth-fill dams are the most common types of dam and the most economical choice. However, they are more vulnerable to internal erosion and piping due to seepage problems that are the main causes of dam failure. In this study, the seepage through earth-fill dams was investigated using physical, mathematical, and numerical models. Results from the three methods revealed that both mathematical calculations using L. Casagrande solutions and the SEEP/W numerical model have a plotted seepage line compatible with the observed seepage line in the physical model. However, when the seepage flow intersected the downstream slope and when piping took place, the use of SEEP/W to calculate the flow rate became useless as it was unable to calculate the volume of water flow in pipes. This was revealed by the big difference in results between physical and numerical models in the first physical model, while the results were compatible in the second physical model when the seepage line stayed within the body of the dam and low compacted soil was adopted. Seepage analysis for seven different configurations of an earth-fill dam was conducted using the SEEP/W model at normal and maximum water levels to find the most appropriate configuration among them. The seven dam configurations consisted of four homogenous dams and three zoned dams. Seepage analysis revealed that if sufficient quantity of silty sand soil is available around the proposed dam location, a homogenous earth-fill dam with a medium drain length of 0.5 m thickness is the best design configuration. Otherwise, a zoned earth-fill dam with a central core and 1:0.5 Horizontal to Vertical ratio (H:V) is preferred.
Publisher: Informa UK Limited
Date: 05-2022
Publisher: Elsevier BV
Date: 12-2023
Publisher: Unpublished
Date: 2018
Publisher: Elsevier BV
Date: 04-2021
Publisher: Informa UK Limited
Date: 22-10-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2018
Publisher: Elsevier BV
Date: 12-2023
Publisher: Informa UK Limited
Date: 2021
Publisher: Springer Singapore
Date: 13-05-2019
Publisher: Springer Science and Business Media LLC
Date: 05-01-2021
Publisher: MDPI AG
Date: 28-05-2020
DOI: 10.3390/APP10113725
Abstract: The check dams in grassed stormwater channels enhance infiltration capacity by temporarily blocking water flow. However, the design properties of check dams, such as their height and spacing, have a significant influence on the flow regime in grassed stormwater channels and thus channel infiltration capacity. In this study, a mass-balance method was applied to a grassed channel model to investigate the effects of height and spacing of check dams on channel infiltration capacity. Moreover, an empirical infiltration model was derived by improving the modified Kostiakov model for reliable estimation of infiltration capacity of a grassed stormwater channel due to check dams from four hydraulic parameters of channels, namely, the water level, channel base width, channel side slope, and flow velocity. The result revealed that channel infiltration was increased from 12% to 20% with the increase of check dam height from 10 to 20 cm. However, the infiltration was found to decrease from 20% to 19% when a 20 cm height check dam spacing was increased from 10 to 30 m. These results indicate the effectiveness of increasing height of check dams for maximizing the infiltration capacity of grassed stormwater channels and reduction of runoff volume.
Publisher: MDPI AG
Date: 24-02-2020
DOI: 10.3390/SU12041676
Abstract: Dam and powerhouse operation sustainability is a major concern from the hydraulic engineering perspective. Powerhouse operation is one of the main sources of vibrations in the dam structure and hydropower plant thus, the evaluation of turbine performance at different water pressures is important for determining the sustainability of the dam body. Draft tube turbines run under high pressure and suffer from connection problems, such as vibrations and pressure fluctuation. Reducing the pressure fluctuation and minimizing the principal stress caused by undesired components of water in the draft tube turbine are ongoing problems that must be resolved. Here, we conducted a comprehensive review of studies performed on dams, powerhouses, and turbine vibration, focusing on the vibration of two turbine units: Kaplan and Francis turbine units. The survey covered several aspects of dam types (e.g., rock and concrete dams), powerhouse analysis, turbine vibrations, and the relationship between dam and hydropower plant sustainability and operation. The current review covers the related research on the fluid mechanism in turbine units of hydropower plants, providing a perspective on better control of vibrations. Thus, the risks and failures can be better managed and reduced, which in turn will reduce hydropower plant operation costs and simultaneously increase the economical sustainability. Several research gaps were found, and the literature was assessed to provide more insightful details on the studies surveyed. Numerous future research directions are recommended.
Publisher: Unpublished
Date: 2013
Publisher: MDPI AG
Date: 30-09-2023
DOI: 10.3390/W15193449
Publisher: Springer Science and Business Media LLC
Date: 18-02-2022
No related grants have been discovered for Ahmed Mohammed Sami Al-Janabi.