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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 18 Documents
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Search results for , issue "Vol 20 No 3, Dec (2018)" : 18 Documents clear
Mechanical and hydrological time-dependent properties of granulated blast furnace slag-sand mixture in soft ground improvement T. Sakata; N. Yasufuku; R. Ishikura; A. Alowaisy
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Every year about 20 million tons of Granulated Blast Furnace Slag (GBFS) are produced as a manufacturing byproduct. GBFS is mainly utilized in cement production accounting for 70% of the total utilized weight, while the geotechnical engineering applications accounts for 2%. Therefore, finding innovative utilization methods is a necessity. It was reported that the GBFS can be used as substitutive material in sand compaction pile (SCP) method. This study aims at evaluating the time-dependent mechanical, hydrological and chemical properties of the GBFS and the GBFS-sand mixtures. It was found that for early hydration stage, the hydrological and mechanical properties of the GBFS depends on the microstructure of the material, while the generation of the calcium silicate hydrate can be neglected. On the other hand, for longer curing time the influence of the calcium hydrate silicate generation becomes significant. Finally, it was concluded that mixing the GBFS with sand is a simple efficient way to control the time dependent mechanical, hydrological and chemical properties of the GBFS, however, the combined effect of the hydration reaction rate and the void ratio developments in response to the mixing ratio and the curing time should be properly considered to optimize utilizing the GBFS.
Effect of cations on consolidation and permeability of polymerized bentonite N. Prongmanee; J.C. Chai; S. Shrestha
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Properties of a novel material “polymerized bentonite (PB)” and a traditional untreated bentonite (UB) were investigated through two series of laboratory tests (i.e., consolidation test and filter press test). Three different test liquids included of deionized water, 0.6 M NaCl and 0.6 M CaCl2 were used in this study. The results of consolidation tests indicated that the compression index (Cc) and swelling index (Cs) decreased, while the coefficient of consolidation (cv) increased with the increasing in concentration and valence of cation in the solutions. Comparison between two materials in the cationic solutions, the PB had higher Cc and Cs value, but it gave lower cv value compared with that of the UB. The results of estimated permeability (kfilter) from the test results of the filter press showed that the PB gave lower values of kfilter for all the test solutions compared with those of the corresponding UB due to the polymer “locked” Na+ ions carried by the bentonite particles and partially prevented it to be replaced by higher cation charge. Based on the results of permeability, it is suggested that the PB can provide better barrier properties against aggressive cationic solutions compared to that of the UB.
The form of street spatial layout based on a wind environmental perspective X.Y. Ying; Q. Kan; G. Ding
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

With China's rapid urbanization, the construction of central areas in city with numerous buildings and dense population has greatly changed the microclimate. Different street spatial layouts change the internal wind environment, which affect the pedestrian comfort. Computational fluid dynamics (CFD) models are used to study the correlation between the three-main street spatial layout factors, which are near-line rate, street interface density and street aspect ratio, under the simulation of relevant weather conditions. Firstly, the wind speed within the street change with the increase of the near-line rate like a parabola trend, and the wind speed reaches its peak about at a near-line rate of 70%. In that case, it’s conducive to ventilation. Secondly, with the reduction of street interface density the variation of the wind speed of each measuring point in the streets is getting bigger and bigger, and the pedestrian walking in them will feel the change of wind speed which makes the comfort of pedestrian decrease. Thirdly, the average wind speed in urban streets is inversely proportional to the street aspect ratio. These conclusions will provide an important reference and evaluation basis for urban designers at the beginning of design and effectively avoid future wind environment problems.
Simulation and prediction of wetland vegetation type based on CA-Markov model D.J. Guan; S.J. Qu; S.S. Yang; Y.X. Zeng
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

The construction of The Three Gorges Reservoir has changed wetland vegetation type and reconstituted Hydro-fluctuation belt pattern. In this paper, we use the improved method to extract the Hydro-fluctuation belt with clear boundary and four types of wetland land use types, and analyze the dynamic changes of wetland land use types through the area change and structural change. The CA-Markov model is used to simulate the distribution map of the wetland utilization type in the next 20 years. The results show that the vegetation coverage stability of the fluctuate belt has improved; the activity of each type is reduced and the stability is enhanced; the transfer of the terrestrial plants is affected by the bare soil, and the water body has a great influence on the centroid transfer of the hygrophyte; it can be seen from the prediction of the distribution pattern of the future Hydro-fluctuation belt that the stability of the Hydrofluctuation belt will gradually decrease if the environment of the Hydro-fluctuation belt is not protected by human intervention.
The impact of urban development on social capital in urban fringe area of Bangkok, Thailand P. Iamtrakul; I. Raungratanaamporn; J. Klaylee
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Rapid development in center core of urban area motivates people from rural migrates to urban for reaching better quality of life. However, due to the hindsight between development planning and policies, and tangible development causing negative impacts on several dimension of urban living which includes increasing social isolation, unsafe condition and auto-dependency. This situation has affect social capital on both individual and communities level. Therefore, the aims of this study are (1) to identify the set of variables that influence on social capital formation in suburban area; (2) to determine the component factors that formulate social capital value in variety context of urban development; and (3) to analyze relationship among physical factors together with nonphysical ones for examine its effects. This study selected Thakhlong Municipality as a study area to perform spatial analysis for investigating different typology of social capital value among a variety group of residents disperse in urban fringe of commuter town character. Results from this study demonstrated that the formulation of social capital values influenced by the integrating effect of both physical characteristics of building agglomeration and social perspectives which was stimulated by land use policy and planning.
Contribution on water transportation for resilient and sustainable lowland cities P. Iamtrakul; I. Raungratanaamporn; J. Klaylee
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Due to a force for development has resulted to rapid urbanization in Bangkok and its vicinities. The attractions of megacity create high number of jobs and opportunities, consequently accessibility and mobility has become super congested which has long been called for sustainable solution to tackle with this problematic of urbanization. A need to change the current supply leads to urgent need of an alternative mode choice for commuters, and adopt a new paradigm of mobilization where suburban urbanization evolves in Bangkokians’ daily life. This study aimed to provide an unconventional solution to meet the current mobility needs through the introduction of water transport systems that focus on access, safety and efficiency within the larger context of reducing commuting time in Bangkok urban areas. This effort through its various initiatives to return the role of Bangkok canal network in more sustainable option include the business model option along with social engagement of community people to own their water transport. Finally, this contribution could then help Bangkok not only towards urban mobilizing, but also for resilient and sustainable lowland cities under the risk of flooding in term of mitigation and management.
Effects of hydrodynamic regimes from a proposed marine park in monsoon seasons N.T. Mai; N.T.M. Hang
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

The process of building the Son Tra Ocean Park in Danang city, Vietnam will contribute certain impacts to hydrodynamic regimes leading to erosion or accretion on the coast. In this paper, we used numerical models to simulate hydrodynamic flows, waves, and sediment transport for two scenarios of “without” and “with” project. The results showed that the Park would alter the dynamic flow and lithospheric process in the area and surrounding. Most affected range is of about 200m-800m from the location adjacent of Park. Nearshore current velocity is increased and accretion and erosion in monsoon seasons are usually mild.
Diclofenac removal by submerged MF membrane photocatalytic reactor and coupling with RO membrane T.V. Tung; J. Ananpattarachai; P. Kajitvichyanukul
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

The purpose of coating TiO2 on microfiltration membrane in photocatalytic membrane reactor (PMR) enhances the permeate flux and effluent quality. In this study, Nitrogen doped TiO2 (NTiO2) on ceramic membrane surface submerged in the photocatalytic reactor under visible irradiation was used for diclofenac (DCF) removal. Different photocatalytic processes including without (Vis/N-TiO2 process) and with hydrogen peroxide (H2O2) (Vis/N-TiO2/H2O2 process) were investigated. Kinetic were identified with different DCF initial concentration in bath condition for both processes. The behaviors of DCF removal by the submerged membrane photocatalytic reactor (SMPR) in combination with reverse osmosis (RO) membrane were carried out in the continuous condition in the long term. The result showed that DCF and TOC concentrations increased in the photocatalytic reactor during operation time. It was a cause of returning DCF molecules and its products to the photocatalytic reactor by the RO membrane rejection. Coupling H2O2 with the photocatalytic process enhanced the DCF and TOC removal by SMPR under the visible irradiation.
Application of a two-dimensional model for flooding and floodplain simulation: Case study in Tra Khuc-Song Ve river in Viet Nam N.T.M. Linh; D.Q. Tri; T.H. Thai; N.Cao Don
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

In this paper, a GIS-integrated two-dimensional (2D) model namely Telemac-2D was used to construct floodplain maps of the study area. Firstly, the NAM model based on characteristics of the watershed, rainfall and evaporation data were used to provide initial boundary conditions for the Telemac-2D model along with other parameters. In turn, this Telemac-2D was integrated with Digital Elevation Map (DEM) in ArcGIS for floodplain mapping. The calibration and validation results for water level showed a high conformity about the phase and water amplitude between calculated and observed data in the years 2007, 2009 and 2013. A comparison between floodplain mapping and information from surveys showed relative consistency in 2009 and 2013 with a low error. The evaluation criteria of NSE, PBIAS, and RSR had a goodness-of-fit between the simulated and the observed values. Finally, this paper has given us an opportunity to understand the application capabilities of the Telemac-2D model and GIS in floodplain and flood inundation mapping and in the study area.
Integrated impacts of climate change and land use change on surface hydrology in the future in Nakdong river basin in Korea N.V. Quan; N.Cao Don; G.S. Kim
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

The main objective of this paper is to forecast the integrated impacts of both climate change and land use changes on surface hydrology which is focused particularly on streamflow assessment under scenarios (A2, B1, and A1B) of climate change and land use change (2030, 2050, and 2080) in Nakdong basin by combination of both models as hydrology model (ArcSWAT) and land use change model (CA_Markov). The results indicated that the mean annual integrated impacts of climate change and land use change on streamflow in the future showed an increase tendency for all periods under scenarios A2, B1, and A1B. However, B1 scenario showed the highest of +3.97%, while A2 showed the lowest increase of +1.1%. However, the mean months of streamflow showed different changes that were forecasted large changes as an increase from +12 to +18% in months of Jan, Feb, Jul and Aug, while it showed a significant reduction from -9.0% to -19% in May and Oct for all periods under A2, B1, and A1B scenarios. Moreover, results were also to reveal that land use change and climate change both increased on the mean annual streamflow, but the impact of climate change was higher than that of land use change.

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