muhamad zaki bin zulkifli

@umt.edu.my

Faculty of Science and Marine Environment, Faculty of Science and Marine Environment
Universiti Malaysia Terengganu

muhamad zaki bin zulkifli


               Download Compact PDF  
https://researchid.co/zakizulkifli94

RESEARCH, TEACHING, or OTHER INTERESTS

General Earth and Planetary Sciences, Geology, Geophysics
3

Scopus Publications

Scopus Publications

  • Analysis of Lithological Aspects and Their Influence on Slope Stability of the Failed Riverbank in Ajil, Hulu Terengganu, Malaysia
    Sofea Razali, Muhd Nur Ismail Bin Abdul Rahman, Siti Syaza Aiman Seh Wali, Dony Adriansyah Nazarudin, Muhamad Zaki Zulkifli, Ahmad Nor Zaimie Roslan, Effi Helmy Arifin
    Indonesian Journal on Geoscience, 2025
    Riverbank erosion has become a serious problem in The Hulu Terengganu River recently. In some locations, the failed riverbank is particularly hazardous, especially near recreational and plantation areas. Therefore, this study aims to assess the lithological characteristics controlling the failed riverbank in Ajil, Hulu Terengganu, Malaysia. Two localities were chosen based on the hazardous conditions and severity of erosion along the riverbanks. Both riverbanks were vertically logged to differentiate lithological units. Field observations identified four lithological horizons, designated as Litho A-D, based on in-situ characteristics (i.e. structure, plant roots, grain size). Samples were taken from selected horizons for Particle Size Analysis (PSA) and Atterberg limit testing. The results of the investigation from PSA indicate that the samples from localities L1S1, L2S1, L1S2, and L2S2 exhibit positive skewness, with fine sediment sizes identified as silt-clay for L1S1 and L1S2, and sand-silt for L2S1 and L2S2. Conversely, samples L1S3 and L2S3 demonstrate a trend of negative skewness, indicating coarse sediment sizes. The results indicate that the sand-silt composition suggests a decrease in water flow energy from high to low. The coefficient of uniformity (Cu) in this study ranged between 3.6 to 9.81, and the coefficient of curvature (Cc) ranged from 0.63 to 1.66. The Cc values for L1S3 and L2S3 are below 1.0 indicating well-graded soil, while the Cc values for other samples are above 1.0 indicating poorly graded soil.
  • A threshold in submarine channel curvature explains erosion rate and type
    Zaki Zulkifli, Michael A. Clare, Maarten Heijnen, D．Gwyn Lintern, Cooper Stacey, Peter J. Talling, Matthieu J.B. Cartigny, Timothy A. Minshull, Hector Marin Moreno, Jeffrey Peakall, Stephen Darby
    Earth and Planetary Science Letters, 2024
    • Submarine channel evolution within 13 years observed via high-resolution repeat seafloor surveys. • Channel radius of curvature can influence the dominating processes at a bend. • Tight channel bends: outer bend erosion processes are more prominent. • Broader channel bends: knickpoint migrations processes are more prominent. • Channel curvature can affect migration rates and their directions. Submarine channels are conduits for sediment-laden flows called turbidity currents, which play a globally significant role in the offshore transport of sediment and organic carbon and pose a hazard to critical seafloor infrastructure. Time-lapse repeat surveys of active submarine channels have recently shown that upstream-migrating knickpoints can dominate channel evolution. This finding contrasts with many studies of ancient outcrops and subsurface geophysical data that inferred channel bends migrate laterally, as occurs in meandering rivers. Here, we aim to test these two contrasting views by analysing two high-resolution repeat seafloor surveys acquired 13 years apart across the entirety of an active submarine channel in Knight Inlet, British Columbia. We find that two main mechanisms control channel evolution, with the normalised channel radius of curvature (specifically, R* - channel radius of curvature normalised to channel width) explaining which of these mechanisms dominate. Pronounced outer bend migration only occurs at tight bends ( R* <1.5). In contrast, at broader bends and straighter sections ( R* >1.5), erosion is focused within the channel axis, where upstream-migrating knickpoints dominate. High centrifugal accelerations at tight bends promote super-elevation of flows on the outer channel flank, thus, enhancing outer bend erosion. At R* >1.5, flow is focused within the channel axis, promoting knickpoints that migrate upstream at an order of magnitude faster than the rate of outer bend erosion at tight bends. Despite the dominance of knickpoints in eroding the channel axis, their stratigraphic preservation is very low. In contrast, the lateral migration of channel bends results in much higher preservation via lateral accretion of deposits on the inner bend. We conclude that multiple mechanisms can control evolution at different channel reaches and that the role of knickpoints has been underestimated from past studies that focused on deposits due to their low preservation potential.
  • Seismic and Acoustic Monitoring of Submarine Landslides: Ongoing Challenges, Recent Successes, and Future Opportunities
    Noisy Oceans Monitoring Seismic and Acoustic Signals in the Marine Environment, 2023