Permana, Ariva

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Permana, Ariva
Alternative Name
Permana, Ariva Sugandi
Permana, Ariva S.
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Email
ariva.pe@kmitl.ac.th

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    Item type:Publication,
    The trilemma of the water-pricing policy, the social function of water, and the threats to water security in a Metropolitan Region
    (2023-06-01)
    Permana, Ariva Sugandi
    ;
    As’ad, Sholihin
    ;
    Ikhsan, Cahyono
    ;
    Morris, John
    The water security issue is worsened by the presence of the global threat of climate change that may inhibit global and local water availability. This study explores water security from the perspective of three impelling factors and was carried out in Bangkok Metropolitan Region (BMR), Thailand. We define the trilemma as three generally conflicting factors that bring different consequences because of water security. The study was organized by accounting time-independent hydrological budget in the region comprises of surface water, probable atmospheric water, and groundwater against current and future water demands with particular water qualities for different purposes. A sensitivity analysis has also been done. The study found that with current water resources development and water demand, the BMR would unlikely encounter water security issues, given the existing trilemma as a constraint. However, with a continuous increase in water demand and unchanged supply, water scarcity would likely be faced by BMR, as analysis suggests.
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    Item type:Publication,
    Armor Layer Uniformity and Thickness in Stationary Conditions with Steady Uniform Flow
    (2022-06-01)
    Ikhsan, Cahyono
    ;
    Permana, Ariva S.
    ;
    Negara, Arlendenovega S.
    The continuous movement of riverbed particles due to turbulent flow determines the stability of non-cohesive riverbeds and banks during riverbed and bank erosion and sedimentation. This study emulated the stable channel design by deriving the low maintenance cost of the channel through bed protection by an armor layer. The study investigated the effects of shear stress and grain size uniformity to determine the minimum non-cohesive armor layer thickness for the stability of riverbeds under steady uniform flow conditions. Experiments were conducted with four different discharges, five armor material gradations, and five bed-slope variations in a full-scale flume. We observed and recorded the behaviors of the five gradations of armor materials for given discharges and bed slopes. Eighty data points were recorded and analyzed. The hydraulic analysis of the flow along with the soil mechanics analysis of the armor materials was done. The soil mechanic analysis was particularly focused on the uniformity coefficient of the armor layer, C<inf>u</inf>, to derive the armor layer equation. However, for the manageability of the study, we set the limit of the Cu between 3.0 and 6.0. From the viewpoint of non-erodibility, a wider C<inf>u</inf> value indicated a thinner armor layer. Variables that govern the armor layer thickness and the layer thickness itself were derived and proposed. The variables, namely C<inf>u</inf>, shear stress (t<inf>0</inf> and t<inf>c</inf>), and mean diameter of the bed load and armor materials (D<inf>b50</inf> and D<inf>a50</inf>). Our results show that these variables governed the thickness of the armor layer, and this is expected to contribute to the design of stable natural channels, which can minimize the cost of irrigation canal maintenance and development.