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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
Application of 2D modeling in simulation the erosion of dykes on Thach Han river basin in Vietnam D.Q. Tri; T.H. Thai; N.T.M. Linh
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Application of 2D modeling to carrying out research on the calculation of water flow rate and the amount of sediments transported has been proved effectively. In this paper, the hydraulic model MIKE 21 was applied to calculate and simulate the data of two big flood events in 1999 and 2005. The calibrated and validated results at Thach Han station and Dong Ha station were relatively similar in terms of phases and amplitude fluctuations of water level with the high value of NashSutcliffe coefficient, and low value of RMSE-observations standard deviation ratio (RSR) and Percent bias (PBIAS). The hydraulic modeling and sediment transport were applied by using MIKE 21 gave an overall assessment on the erosion process on the Thach Han River Basin and river bottom before and after the construction of the dikes and embankments. The construction, accordingly, has proven its significant effects on alleviating the development of increasing erosion on parts of the river flowing through Trieu Do commune, Quang Tri province, Vietnam.
Comparison of major statistical methods and their combination using matrix validation for landslide susceptibility mapping A.Q. Akbar; G. Chen
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Landslide risk exists with the mountain regions and every year creates a great life andfinancial losses. To prevent the disaster, numbers of statistical methods have been proposed, but it is still unclear which one is more accurate and yet very few studies proposes a reliable method. Therefore, this study aims to compare the commonly used bivariate statistical method and multivariate statistical methods and their combination to achieve higher accuracy for landslide susceptibility map. Moreover, the classification used for landslide susceptibility mapping is associated with errors, which affects the accuracy of the analysis. In this study, new tool was designed to reduce the classification. To implement this study, a landslide susceptibility maps were created Kabul city. The result proposes that the new designed tool is a good way not only to reduce the classification error by defining the critical thresholds for the classifications. Moreover, all of the statistical methodologies is giving and acceptable result but the combination bivariate and multivariate statistical methods increase the accuracy of the analysis and they are complimentary to each other.
Photocatalytic membrane reactors for water and wastewater treatment applications: process factors and operating conditions review 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

This paper aimed to overview of coupling photocatalytic process and membrane, known as photocatalytic membrane reactors (PMRs) and their potential applications in wastewater treatment, especially application for the decomposition of persistent organic matters. Mechanisms of PMRs for organic removal by photocatalytic and membrane processes are described. PMRs with suspended and immobilized TiO2 on/in the membrane are intensively reviewed. Several operating factors such as pH, initial TiO2 concentration, the concentration of pollutants, dissolved oxygen and aeration, hydraulic retention time as well as light intensity have been intensively discussed. Advantages and disadvantages of two types of PMRs are illustrated. This review is benefit to further future works such as up-scale PMRS to the industrial level, and the operating and maintenance needs for the effective PMRs.
Characteristics of the second stage of evaporation and water redistribution through double layered sandy soil profiles A. Alowaisy; N. Yasufuku
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Evaporation from porous media involves a complex pore scale water and vapor transportation that directly affects the liquid phase distribution and fluxes. The presence of textural contrast boundary in multilayered profiles adds to the complexity. This study aims at evaluating the textural contrast boundary depth and individual layer thickness influence on the actual evaporation and water storage through double-layered soil profiles. For coarse overlying fine sand, it was found that the top layer small capillaries contribute to the majority of water lost through the falling rate stage. Considering fine overlying coarse sand profiles, the pumping phenomenon from the bottom coarse layer to the top fine layer occurs before the arrival of the drying front to the textural boundary due to the increasing suction forces within the top fine layer. The water storage capability of double layered soil profiles depends highly on the top to the bottom small capillaries ratio multiplied by the layer thickness ratio. Regardless the atmospheric conditions and layering sequence, it was concluded that the shallower the textural contrast boundary results in decreasing the total duration required to achieve the residual evaporation stage thus leads to higher water storage capabilities through the first and second evaporation stages.
Field validated prediction of latent slope failure based on cracked soil approach S. Alexsander; I.B. Mochtar; W. Utama
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

This study is to prove the existence of latent sliding of a suspected unstable slope using the cracked soils approach. This study was initiated by trying to map the cracks inside soil slope by means of measuring the Tomographic Resistivity, TR, and Induced Polarization, IP, of the soil at the slope prior to performing stability analysis of the slope. To map the cracks inside the slope at the study location, 3 lines of TR and IP were performed. The results of the 3-line mapping showed the existence of sliding plane toward the slope edge at a depth between 3 – 5 meters below the soil surface, and the sliding plane was about 30 – 50 meters in length. With the cracks and possible sliding planes were known, the cracks could be drawn in 3-dimentional model, as part of the topographical map of the slope. This study had predicted that another slope sliding would occur at the area where the highest stresses and strains concentration were located. It was at this location exactly that another slope sliding had occurred several months afterwards when heavy rain came.
A nonlinear analysis for GRS walls conceiving kinematics of failure against pullout S. Patra; J. T. Shahu
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

A modified nonlinear analysis is presented to investigate the pullout response of geosynthetic reinforced soil (GRS) walls. The analysis conceives a hyperbolic stress-strain relationship for the backfill, the kinematics of the failure and the deformation compatibility between the soil and the reinforcement. The deformation compatibility is incorporated by introducing an updated discretization technique, and the true projected length of the reinforcement after deformation is evaluated by a simple computational scheme. A case study is presented for an instrumented full-scale reinforced soil wall to validate the present analysis. The maximum tension in the reinforcement at each level is computed considering the effect of compaction, and the results are compared with the measured values and those predicted by AASHTO simplified method. The comparison shows that the present analysis gives a better estimation of the reinforcement tension thus can be easily integrated with the existing method. A parametric study is also conducted mainly to determine the effect of stiffness and strength parameters of the subgrade which have a significant influence on the design of GRS walls against pullout failure for all practical applications.
The development of green building in China and an analysis of the corresponding incremental cost: A case study of Zhejiang Province J. Ge; J. T. Weng; K. Zhao; X. C. Gui; P. Li; M. M. Lin
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

With a focus on the survey of the green building development in China as well as the evaluation of the corresponding incremental cost, this paper selects 276 green building projects in Zhejiang Province and obtains comprehensive data, based on which the development of green buildings in the province is analysed. The results are then compared with the national data in such aspects as the certification grade, building type, geographical distribution and application frequency of green building technologies. Statistical analyses are also conducted on the technology application frequency and the incremental cost, which conclude that different types of green buildings would apply significantly different technologies considering factors like energy saving, material saving, indoor environment quality and operational management. According to the sample data, the incremental cost of green building technologies is found to make up less than 2% of the total building costs; and it increases with the upgrading of certification grade. When the floor area exceeds 100,000 square meters, the incremental cost would remain less than 60 yuan per square meters. Costs for water-saving and energy-saving technologies account for over 80% of the total incremental cost. This study would provide guidance for the selection of green building technologies.
Motorcycle accident model for highlands regions by applying Generaliazed Linear Model (GLM) Sobri Abusini; L Ambarwati
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v20i3, Dec.747

Abstract

Motorcyclists are the major victims in highway accidents due to instability of motorcycle vehicle and driver behavior. Currently, insufficient studies related to motorcycles accident model considering road geometry and traffic characteristics in highland regions were conducted. This study carried out the investigation on crashes involving motorcycle, development of motorcycle accident model for highland regions of Malang City, East Java Province as a case study. The research analysis employed the Generalized Linear Model (GLM). The model was developed by using accidents data from Police Department and investigation of traffic and road geometry as black spots. On ten road sections investigated and distributed questionnaires to 100 respondents, the respondents experience 1-2 times accidents with light injuries (26%) and serious injuries (11%), and no injury (3%). Accidents occur at noon (11%) and afternoon (13%) and due to their own fault and crashing with other motorcycle (27%). The results are found out that motorcycle accident model influenced by traffic factors, i.e. flow and speed and also road geometric factors, i.e. lane width (LW), shoulder width (SW), number of lanes (NL), number of access roads (NA) and walkway width (WW).

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